Industrial Components Research Articles

Effect of Coal Rank and Coal Facies on Nanopore-Fracture Structure Heterogeneity in Middle-Rank Coal Reservoirs.

Considerable variations in microscopic and industrial components (ash, moisture, volatile matter, etc.) have been reported within identical coal seams. These disparities in coal quality and pore structure within the same coal seam profoundly affect the drainage of deep coalbed methane (DCBM). This study focuses on 22 coal samples collected from two wells in the Benxi Formation of the central and eastern parts of the Ordos Basin. First, the coal facies were determined for all samples using submicroscopic components, and then, the adsorption pore and seepage pore structures were studied through CO2/N2 adsorption and mercury intrusive tests. Subsequently, the study delves into the correlation between coal rank, coal facies, and the distribution of the pore structures across various pore sizes, elucidating the primary controlling factors influenced by coal rank and coal phase. The results are as follows: (1) For a given coal seam, R o,max exhibits minimal variation among the samples, which suggests R o,max is not the primary factor affecting pore structure. Conversely, the ash content occupies the pore space, thereby revealing a negative correlation between the ash content and adsorption pore volume (PV). (2) On the basis of the texture preservation index (TPI) and gelatification index (GI), coal facies were classified into moist forest swamp facies (type A), moist herbaceous swamp facies (type B), and water-covered herbaceous swamp facies (type C). Type A is characterized by higher TPI, lower GI, and ash content, whereas type C exhibits lower TPI, higher GI, and ash content. (3) Type A samples, with the lowest ash content, display larger PV and specific surface area (SSA) compared with type B, while type C has the lowest values. Type C, with the highest vitrinite content, predominantly consists of semibright and bright coal, prone to microcracks, which results in a higher seepage PV compared with types A and B. (4) The coal facies represent variations in ash content and microscopic components, which significantly impacts both adsorption and seepage pores. Moist forest swamp facies samples are characterized by micropore development and the highest content of adsorbed gas. Herbaceous swamp facies samples display macropore development and the highest content of free gas.

Pengaruh Store Atmosphere dan Harga terhadap Revisit Intention Konsumen pada Kawisari Coffee dan Eatery Jakarta

Food and beverages are a component of the tourism industry that draws people to a location. Price and the atmosphere of the store, in addition to taste and product quality, can influence a customer's decision to shop. Kawisari Coffee & Eatery is a food and beverage retailer based in Jakarta. Many people who went to Kawisari Coffee & Eatery Jakarta had bad experiences because the hot environment made them feel uncomfortable and the prices weren't what they expected. Their decision to return may be influenced by this. The motivation behind this examination is to figure out how clients' expectations to get back to Kawisari Espresso and Restaurant Jakarta are impacted by the shop environment and costs. This study used quantitative descriptive methods. The sample for this study consists of customers who have made purchases at Kawisari Coffee & Eatery Jakarta. To gather information, polls were disseminated to 100 respondents utilizing the purposive inspecting methodology. SPSS Experiences 25 was used to play out different straight backslide examination on the data. With a normal t worth of 4.473 which is more unmistakable than the t table of 1.661 and a significance level of 0.000 which is more noticeable than 0.05, this investigation shows that (1) shop air basically influences plan to get back to. (2) Cost influences mean to get back to, with a basic worth of 0.317 more conspicuous than 0.05 and a normal t worth of 1.005 t table of 1.661. (3) The goal is to return to the combination of store climate and cost impacts, with an expected f-count value of 10.419 higher than the f-table value of 3.09 and an importance level of 0.000 higher than 0.05. The ideas that can be given for Kawisari Espresso and Restaurant Jakarta are to expand the quantity of climate control systems to keep clients from feeling overheated and focusing entirely on reasonable and cutthroat costs for clients to increment client encounters and animate client interests to visit once more.

A Comprehensive Review on Advanced Extraction Techniques for Retrieving Bioactive Components from Natural Sources.

The extraction of bioactive components from natural sources has gained significant attention in recent years due to increasing demand for natural and functional constituents in various industries, including pharmaceuticals, food, and cosmetics. This review paper aims to provide a comprehensive overview of the studies on extracting bioactive components from natural sources using different advanced extraction techniques. It highlights the need for efficient extraction methods to preserve these components' integrity and bioactivity. Various extraction techniques as supercritical-fluid extraction, microwave-assisted extraction, ultrasound-assisted extraction, subcritical solvent extraction, and solid-phase microextraction are explored in detail, highlighting their principles, advantages, and limitations. The review further examines the impact of different factors on the extraction process, including solvent selection, extraction time, temperature, ultrasonication-amplitude, etc. Additionally, emerging techniques, such as green extraction methods and nanotechnology-based approaches, are discussed, emphasizing their potential to enhance the extraction efficiency and sustainability of the process. Furthermore, the review presents case studies and experimental results from recent research articles, providing insights into applying different extraction techniques for specific bioactive components, such as phenolics, flavonoids, alkaloids, and essential oils. It discusses the extraction yield, bioactivity, and potential utilization of the extracted components in various industries. Overall, this review paper is valuable for researchers, scientists, and industry professionals interested in extracting bioactive components from natural sources. It consolidates the current knowledge on different advanced extraction techniques, their optimization parameters, and their potential applications, facilitating further advancements in the field and the development of innovative extraction methods for bioactive component extraction from natural sources.

Feasibility of Establishing and Re-operation of Industrial Projects in Iraq Through import-substitution strategy

The research idea originated from the significance of the industrial sector and its pivotal role in inducing structural and systemic changes at the national economic level. Given the numerous challenges the industrial sector faces in Iraq, many industrial projects have partially or entirely ceased operations. In contrast, state-owned industrial companies have become a burden on the government. Import substitution through manufacturing is considered one of the leading strategies and most vital industrial approaches that have historically catalyzed industrial growth and structural transformations in the economy. This has been evident in the development of countries that initially relied on primitive economic models centred around simple agriculture and the export of raw materials and transitioned into diversified economies with a significant industrial component, producing numerous high-quality and technologically advanced products. Based on this, the study aims to assess the compatibility of this strategy with the current Iraqi economic landscape. It seeks to shed light on inactive industrial projects and companies, exploring the feasibility of reactivating them or establishing new industrial ventures. Priority will be given to projects aligned with its objectives and goals. Additionally, the study aims to provide a forward-looking perspective on the state of the industry in Iraq's prospects, diagnose existing problems, and attempt to find solutions and remedies that can contribute to establishing a reliable industrial sector.

Interfacial characteristics of Nickel-based hybrid structures fabricated using directed energy deposition

The wire-arc directed energy deposition technique was used to develop nickel-based hybrid structures or to repair conventional structures of nickel-718 superalloy. Three different cases were investigated: deposited IN718 and IN625, separately, over the conventional IN718 substrate and deposited IN718 over the previously deposited IN625 substrate. The interfacial characteristics with respect to the microstructural features, residual stresses, compositional changes, etc., were studied using a finite element computational framework and a Monte-Carlo grain growth model. The numerical results were successfully validated with the experimental results. All the hybrid structures revealed excellent interfacial bonding with no defects, as evidenced by the failures outside the interface during their tensile tests. However, the interfacial characteristics differed for each material condition. The results discussed in this study will improve the understanding of developing nickel-based hybrid structures using additive methods and can potentially be beneficial in repairing industrial components.

Electrodeposition of myristate based superhydrophobic coatings on steel with enhanced corrosion resistance and self-cleaning property

In recent decades, superhydrophobic (SHP) coatings have gained significant attention because of their versatile applications. Superhydrophobic coating is considered as a promising solution to combat corrosion and biofouling issues encountered by steel components in various industries. Using a one-step electrodeposition technique, a superhydrophobic coating with strong corrosion resistance and anti-biofouling property was fabricated on carbon steel in this work. With a water contact angle (WCA) of 170.3 ± 4.2° and a sliding angle (SA) of ∼1°, the wettability of the surface was optimized by varying the electrodeposition potential and deposition time. The as-developed superhydrophobic carbon steel surfaces were characterized by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), laser Raman spectroscopy (LRS), Energy dispersive X-ray (EDS) spectroscopy and X-ray diffraction (XRD). Employing field emission scanning electron microscopy (FESEM), the morphology of the superhydrophobic coatings was examined. Potentiodynamic polarization (PDP) technique was used to study the anti-corrosion property of SHP coating and bare sample in 3.5 wt% NaCl solution. The superhydrophobic coating was found to exhibit 99 % corrosion inhibition efficiency. In addition, the biofouling resistance of the coating was evaluated in both gram-negative and gram-positive bacterial cultures and compared with the uncoated sample. Total viability count (TVC) for the SHP coated samples was 5 orders less as compared to the uncoated sample exposed to gram-negative bacterial culture. Similarly, 4 orders reduction in TVC was estimated for the SHP coated sample as compared to the uncoated sample in gram-positive bacterial culture. The impact of superhydrophobic coating on the corrosion performance and biofouling properties of carbon steel was investigated along with the self-cleaning property and robustness of the coating.

Tetrabutylammonium hydroxide (TBAH) ionic liquid for the sustainable and efficient production of α-hydroxyphosphonates

Ionic liquids were known as eco-solvents/catalysts, encourages the clean hydrophosphonylation of aldehydes to produce structurally various α-hydroxyphosphonates in a well-organized and ecologically friendly manner. This study used tetrabutylammonium hydroxide (TBAH) used to addition phosphite nucleophiles to aldehydes under neat condition, resulting in different α-hydroxyphosphonates that are essential components of the modern chemical industry. The current method produces targeted compounds from a wide range of aromatic, and heteroaromatic aldehydes with various substitution. The current protocol has high impact because it allows for the formation of desired products in good yields. This catalyst is applicable for gram scale synthesis of the targeted product and without any additional energy (Microwave, ultrasonication, ball milling and thermal heating). Some reported methods used various external sources (mechano-chemical) for the synthesis of α-hydroxyphosphonates.

Microstructural Modification, Mechanical Properties, and Wear Behaviour of Aged Al-Si-Mg/Si3N4 Composites for Aerospace Applications

The main objective of the present research is to probe how ageing time influences the morphological, mechanical, and wear behaviour of stir cast Al-Si-Mg alloy, reinforced with 10 wt.% Si3N4 particles subsequently heat treated in T6 condition. The findings reveal that the presence of Si3N4 reinforcements, followed by the heat treatment, enhances the mechanical and tribological properties of the composite. The ensuing mechanical properties show significant improvement prior to aging heat treatment (180 °C/4h), reaching a hardness of 120.8 HV (45 % increase) and tensile strength of 275 MPa (50 % increment), respectively compared to as-cast composite. Fractography reveals dimples, transgranular cleavage surfaces, cracks, and micro-ploughing. Among the samples tested, the composite aged for 4 h (180 °C/4h, ASN-4) demonstrates the lowest wear rate. Abrasive and adhesive wear in combination is the primary wear mechanism in these samples. Overall, this research provides insights for research endeavors in manufacturing various components in the aerospace industry.

Thermal non‐destructive testing and evaluation for inspection of carbon fibre‐reinforced polymers

Thermal non‐destructive testing and evaluation (NDT&E) is crucial in ensuring the quality and safety of industrial materials, components and structures. It serves as a key tool for assessing their operational reliability, thus enhancing safety in a wide range of industries. There is a growing demand for dependable, swift, remote and secure inspection and assessment techniques to detect hidden flaws, especially for sustainable solutions, which prompts adjustments in design and manufacturing standards. Hidden defects often emerge during the service life of these materials and structures due to various stress factors, potentially resulting in catastrophic failures. This study delves into an optimal and dependable experimental method for conducting fast, remote and secure inspections and assessments of carbon fibre‐reinforced polymer (CFRP) materials using infrared imaging (IRI) as part of thermal non‐destructive testing and evaluation (TNDT&E). Additionally, it examines the post-processing approach associated with this technique. This perspective also sheds light on the current state-of-the-art of infrared imaging methods employed in TNDT&E, emphasising the strengths and weaknesses in their ability to detect subsurface defects present within the material. Most of the methods discussed in previous research primarily focus on the thermal differences in specific areas of a sample using processed thermal images, even though these images come from analysing a series of images captured over time. This study highlights the latest research in thermal/infrared non‐destructive testing and evaluation, along with related post-processing techniques. It not only aims to show hidden subsurface defects through thermal differences but also provides information about how these defects change over time.

State of the Art and Future Trends in Monitoring for Industrial Induction Heating Applications

Induction surface hardening (ISH) processes are widely used in the heat treatment of numerous industrial components, especially in the automotive industry. Since this industry operates under very demanding quality standards, it is crucial for these heat treatment processes to meet rigorous specifications to ensure the safety and reliability of the produced components. This implies the precise and repeatable control of certain parameters throughout the manufacturing process of each of the parts treated, through precise and reliable instrumentation in electromagnetically harsh environments. The main objective of this work is to define the monitoring process for an industrial IHS application, determining the control needs and the methods of measurement, recording, and verification of the parameters that ensure the quality of the process. This paper describes the monitoring process of induction surface hardening, emphasizing the use of sensors and modern measurement and control systems. A comprehensive monitoring system supported by a programmable logic controller (PLC) and mixed acquisition and instrumentation systems (analog and digital) implemented with a high-performance Field Programmable Gate Array (FPGA) will be presented.

ЕКОНОМІЧНИЙ АНАЛІЗ РІВНЯ ІННОВАЦІЙНОГО РОЗВИТКУ ЗАКЛАДІВ КУЛЬТУРИ АЗЕРБАЙДЖАНУ

Existing management mechanisms, such as planning and programming for the development of the cultural sector, despite their complexity and widespread use in the practice of managing the sociocultural sphere, do not provide sustainable results that can be achieved in the cultural sector in the context of the implementation of reforms in the budgetary sector and the use of programmatic financing of culture . It is absolutely necessary to develop and apply innovative technologies in the management process, taking into account the complexity of the tasks facing cultural subjects in connection with the adaptation of self-justifying management mechanisms, as well as taking into account the needs of a post-industrial (information) society, as well as updating the consumer audience of cultural products and services. The use of an integrated approach to the formation of innovative management mechanisms will improve management efficiency, as well as ensure the development of innovative processes both in the sphere of culture in general and in its individual subjects.The purpose of the article is to develop scientific and methodological recommendations for innovation models based on the use of integrated approaches in managing cultural enterprises and supporting development, as well as to study theoretical and methodological problems in the systematization of these methods. The methodological basis of the research in the article is the scientific work of the authors in the field of economics of culture, innovation management, management in the field of culture, as well as social partnership. The research was carried out on the basis of general scientific methods of research - a systematic approach, analysis and synthesis, methods of typological and comparative analysis, empirical methods.The object of the study is the sphere of culture, which needs conditions in which organizational and financial reforms are carried out, as well as the development and application of innovative management methods.The hypothesis of the study. In general, there is a great practical demand for research activities aimed at the relevance of the dissertation research topic, the development of the main directions and strategic priorities of the national economy of the cultural sphere of the region. The same can be said about the priorities of strategic management and the main directions of the regional industrial component, that those priorities and directions that we mentioned determine the goal, objectives, subject and object of this research work, presented on the basis of an assessment of the increased effectiveness of the management system for the development of the cultural sector municipal districts of the region. Presentation of the main material.The scientific novelty of the results of the research carried out by the authors is as follows: the essence of strategic management of the cultural sphere is determined as a targeted activity to create socio-economic and legal conditions for the regular and balanced development of the cultural space and meeting the needs of the population for cultural services; Methodological recommendations have been developed to improve the effectiveness of the process of strategic management of the regional cultural sector based on the implementation of promising management effects in the process of industry development.The originality and practical significance of thestudy.The practical significance of the article lies in the fact that the developed software-design method and the multidimensional assessment method can be applied in order to increase the innovative effects obtained from project activities in the sociocultural sphere. The practical significance of the article is also determined by the use of theoretical and methodological works proposed by state bodies and local governments, as well as the possibility of their use by the heads of economic entities of the specified region in the process of forming measures that can ensure the sustainable development of the cultural sphere of the region.Conclusions.The scientific novelty of the research results lies in the fact that scientific and methodological recommendations have been developed for improving and applying models of innovative management in the field of culture, and the use of an appropriate mechanism has been proposed to increase the innovative effect of the project program.Recommendations are given for optimizing management strategies in the field of culture for its further development.

The Geographical Components of Grain Milling Industry in Thi- Qar Governorate

This study aims to explore the geographical components of the grain milling industry in Thi- Qar Governorate in 2023. The research is divided into two main sections: the first section addresses the key indicators of the development of the grain milling industry in Thi-Qar Governorate for the period 2011-2021, while the second section examines the geographical components of the grain milling industry in Thi-Qar Governorate. The study concluded that the governorate possesses many natural and human geographical components that have contributed to the localization of the grain milling industry. However, the study's findings indicated that the industrial sector has not invested in these components. Furthermore, the grain milling industry holds economic importance by providing job opportunities and reducing unemployment. The study aims to understand the indicators of the development of the grain milling industry in Thi- Qar Governorate, as well as the role of geographical components in localizing this industry in the governorate.

Changes in cottonseed meal quality during post-harvest processing of cottonseed

This study investigates aflatoxin contamination levels during the post-harvest processing of whole cottonseed into defatted cottonseed meal, a critical feed component in the dairy industry. Whole fuzzy cottonseed, a byproduct of cotton gins, undergoes various processes to extract oil and produce meal and hulls. These are either used as animal feed or soil amendments. However, aflatoxin contamination poses significant challenges due to strict FDA action levels for dairy and beef cattle feed. This contamination occurs when Aspergillus flavus infects crops under specific environmental conditions or through improper handling during post-harvest processes. Our research aims to document aflatoxin levels during each stage of post-harvest processing, from cleaning to meal formation. Preliminary findings suggest that certain stages may concentrate aflatoxins akin to other agricultural products like dried distillers’ grains and solubles (DDGS). The implications of these findings could be profound for the dairy industry, where low allowable aflatoxin levels impact both economic and animal health outcomes. The cottonseed post-harvest process consists of cleaning, delinting, hull removal, kernel flaking, oil extraction, and meal formation. Understanding how aflatoxin levels change during these steps is crucial for ensuring safe and high-quality defatted cottonseed meal for livestock consumption. Microbial levels increased by 4 orders of magnitude during the acid delinting process, from 7.0× 105 to 5.2 × 109 CFU/g, and 5 orders of magnitude during the mechanical delinting process, from 7.3× 105 to 1.5 × 1010 CFU/g for the inoculated cottonseed samples. Higher microbial load was associated with lower protein levels and lower fat acidity levels. Further research will shed light on the effects of aflatoxin concentration on the nutritional value of the final product.

Investigation of Cavitation Flow and Entropy Production Characteristics in a Dual-Rotor Turbine Flowmeter

Flow meters are extensively utilized in fields such as chemical engineering, petroleum, and aerospace, and are an indispensable component of modern industry. This paper examines the metrological properties of a dual-rotor turbine flow meter within its measurable flow range through experimental approaches and investigates the cavitation flow dynamics within the flow meter using numerical methods. First, the flow characteristics curve of the dual-rotor turbine flow meter was established experimentally, and the accuracy of numerical simulation results was validated. Secondly, the transient characteristics of the cavitation cavity were revealed using the Z-G-B cavitation model and dynamic mesh technology. Finally, entropy production theory was applied to investigate the energy losses caused by cavitation, analyzing the contributions of different types of energy losses during the cavitation process. Flow calibration experiments and numerical simulations reveal an increase in the meter coefficient of the dual-rotor turbine flow meter in high-flow cavitation zones, indicating that the displayed flow rate is slightly higher during cavitation compared to non-cavitating flows. Transient cavitation flow undergoes three stages: attachment, development, and collapse. At 323 K, the volume fractions of upstream and downstream cavities increase by 38.9% and 48.3%, respectively, with the cavitation cycle duration being 1.21 times that at 298 K. At 343 K, these increases are 75.3% and 239.2%, with the cycle duration being 2.63 times that at 298 K. Among the various sources of loss, the contribution from losses due to pulsating velocity gradients is the most significant, with maximum proportions of 81.95%, 85.1%, and 87.11% at 298 K, 323 K, and 343 K, respectively.

A high-accuracy single-frame 3D reconstruction method with color speckle projection for pantograph sliders

The carbon slider of the pantograph is a crucial component in the high-speed rail power system, and regular maintenance is of great significance. 2D-based approach is susceptible to inaccuracies caused by defects, rainwater, stains, and other factors. Due to the weak texture and uneven reflectance of the slider, it is difficult to obtain accurate 3D information through a single-frame approach. To address this issue, this paper proposes a high-accuracy 3D imaging method for sliders, successfully resolving the long-standing problem of low reconstruction accuracy and limited generalization in pantograph reconstruction. Firstly, high-precision disparity maps of industrial component are generated using the binocular Gray Code phase-shifting method as the Ground Truth, and the color speckle pattern is subsequently utilized as the input for the model. Secondly, we propose a split-cost volume approach that achieves cost aggregation using only 2D decoding-encoding operations. Furthermore, disparity regression is utilized to provide the initial disparity for the GRU(Gated Recurrent Unit), thereby accelerating the convergence speed of the model. Quantitative experiments of optical standard sphere validated that the proposed method could achieve 3D reconstruction with a radius error of no more than 0.07 mm. The pantograph reconstruction results showed that the average absolute error of the carbon slider did not exceed 0.21 mm under reasonable exposure time and the working distance at which focus has been achieved, which meets the requirements of industrial inspection.

Knowledge Management Strategy of Advance Manufacturing Study Case in Automotive Component Industry

Advanced manufacturing enterprises are typically have implemented automation and digital technology, Just in Time production and system, and advanced product development. But all those advanced manufacturing implementations did not instantly give result as expected, because people within enterprise was not ready as important actors. Effective knowledge management strategy was needed to face this constraint. This research was show us the priority strategy of knowledge management at a manufacturing enterprise in which has implemented advanced manufacturing. This research involved 4 internal experts to formulate knowledge management strategy and then decide the most priority one. APO knowledge management assessment tool was used combined with Analytical Hierarchy Process (AHP). There were 4 alternatives of knowledge management strategy as the result, i.e (1) integrating knowledge management with performance management, (2) optimize information technology to support knowledge management process, (3) develop community of practice trough expert track career path, and (4) Implement learning review during project. The by using AHP, integrating knowledge management with performance management was decided as first priority strategy.

Analysis of Metoxyl and Galacturonate Contents from Pectin of Banana Peel Waste Combined with Sappan Wood

The production of banana plants (Musaceaea sp.) ranks first in agricultural output in Indonesia, but this is not balanced by the processing of waste from banana peels, which is a large amount. Therefore, an attempt is made to use banana peel waste as raw material for making pectin. Pectin is used as a functional component in the food industry because of its ability to form thin gels and stabilize proteins. Pectin is also used as a filler in the paper and textile industries, and as a thickener in the rubber industry. This research aims to determine the effect of extraction time and temperature on the quality of pectin from Kepok banana peels. The method used is extraction through Ultrasonic Assisted Solvent Extraction (UASE) in 40 kHz. Banana peels that had been dried and ground into powder were extracted with 0.1 N HCl at temperatures of 70 oC, 80 oC and 90 oC. The variables used in this extraction are variations in extraction time, namely 60 minutes and 80 minutes. The extracted solution is filtered and thickened to half the volume of the original filtrate by heating, then the pectin is thickened using acid ethanol. The pectin precipitate was washed using 96% alcohol until it was free of chloride and the precipitate was separated using a vacuum and then dried in an oven then to analysis of pectin using methoxyl and galacturonate as method to determine pectin quality form banana peel waste. The research results showed that the pectin quality was optimum at a temperature of 90 oC for 80 minutes with a methoxyl content of 4.12% (low methoxyl) and a galacturonic acid content of 79.96%.

Water Condenser Bed to Reduce Trichloroethylene Gas Emission and Air Quality

Purpose: The purpose of this research is how to reduce trichloroethylene emissions using a condenser and the efficiency of reducing trichloroethylene emissions before and after using a condenser. Theoretical Framework: Air quality is influenced by trichloroethylene emissions, condenser and efficiency, trichloroethylene emissions, and condenser. Method: The research carried out was quantitative descriptive research. Data Source: Literature Study; Field observation; Trichlorethylene gas recovery process in existing systems in the field such as dryer units, carbon bed units and added condenser units. Sampling method with Trichlorethylene, Gas Emission, Concentration Measurement. Results and Discussion: The efficiency value of reducing the trichloroethylene gas emission load before and after adding the condenser reached 68.16%. The emission load on the chimney before adding the condenser was an average of 223 kg/day and after adding the condenser an average of 71 kg/day. Research Implications: The efficiency of reducing the trichloroethylene gas emission load is influenced by several supporting factors, namely the temperature of the condenser cooling water and the surface area of the cooling water tube pipe. Originality/Value: The Electric Accumulator Component Industry with products in the form of sheet-shaped Electric Accumulator Separators made from polymer powder, silica powder, oil, and other supporting materials with the production capacity will affect the formation of the solution.

Prediction of case depth for deep carburising heat treatments based on the spatial gradient feature of the grain size profile

ABSTRACT Precise evaluation of carburising heat treatment is necessary to avoid failure and degradation of high-performance industrial mechanical components. In this work, a novel non-destructive detection method is proposed for the deep carburised case depth (>2 mm) combining spatial ultrasonic backscatter technique and linear regression model. To create various carburised case depths, three groups of cylindrical 20CrMnMo steel samples were heat-treated in various cycles (Carburising, diffusing, quenching at 850–870°C (holding in range of 2.5–3 h) and tempering). The carburising heat treatment results in a gradient microstructure within the surface region caused by changes in grain size. We employed a transverse-to-transverse scattering model to provide the gradient feature of the grain size profile in the depth direction. The extracted gradient profiles of different carburised case depths exhibit two overlapped growth rates with high- and low-slope factors, respectively. With the increase of the carburised case depth, the positions of the centre points increase and the slope factors decrease. Based on these observations, a modified double sigmoidal function was utilised to parametrise the gradient profile curve. The relationship among the selected gradient feature parameters and various carburised case depths has been established. The predicted results were compared to hardness measurements with good agreement.

RTV/GO-SiO2 anti-corrosion nanocomposite coating

Corrosion stands out as a leading factor contributing to the deterioration of industrial components, particularly in equipment utilized for oil and gas transmission and processing. Room temperature vulcanized silicone rubber (RTV) emerges as a promising solution for corrosion prevention due to its notable features including high hydrophobicity, adhesion, and thermal stability. This study focuses on enhancing anti-corrosion properties by applying coatings of RTV polymer with graphene oxide (GO) sheets (RTV-GO) or GO decorated with silicon oxide (RTV/GO-SiO2) onto X60 steel substrates. The investigation delves into the microstructure of the coating, surface hydrophobicity, adhesion to the substrate, and its efficacy in corrosion protection. Various techniques such as X-ray diffraction (XRD), atomic force microscopy (AFM), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR) were employed to analyze the nanocomposites. Furthermore, corrosion resistance was evaluated through open circuit potential analysis, potentiodynamic polarization, electrochemical impedance spectroscopy, and salt spray testing. Results indicate that incorporating GO and hybrid GO-SiO2 into the RTV polymer matrix not only enhances the interface strength between the coating and steel substrate but also boosts corrosion resistance by up to 10-fold compared to uncoated substrates.