Powder Technology Research Articles

Development and Testing of Copper Filters for Efficient Application in Half-Face Masks

SARS-CoV-2 is the causative agent of severe acute respiratory diseases. Its main transmission pathway is through large and small respiratory droplets, as well as a direct and indirect contact. In this paper, we present the results of the development and research of copper filters produced by powder technology. Four types of copper powders were tested. Technological parameters, a microstructure, an energy dispersive X-ray (EDX) analysis, and fractography of copper (Cu) filters are reported. The pressure losses in the P-Cu-AW315 filter showed a very favorable value for using the filter in half-face masks that meet the requirements of European norms (EN). An X-ray tomography measurement was carried out at the I12-JEEP beamline. A relative volume of grains and pores was estimated (on the basis of the segmentation results) to be approximately 50% to 50% of the investigated filter volume.

Materials Development Using High-Energy Ball Milling: A Review Dedicated to the Memory of M.A. Korchagin

High-energy ball milling (HEBM) of powders is a complex process involving mixing, morphology changes, generation and evolution of defects of the crystalline lattice, and formation of new phases. This review is dedicated to the memory of our colleague, Prof. Michail A. Korchagin (1946–2021), and aims to highlight his works on the synthesis of materials by self-propagating high-temperature synthesis (SHS) and thermal explosion (TE) in HEBM mixtures as important contributions to the development of powder technology. We review results obtained by our group, including those obtained in collaboration with other researchers. We show the applicability of the HEBM mixtures for the synthesis of powder products and the fabrication of bulk materials and coatings. HEBM influences the parameters of synthesis as well as the structure, phase composition, phase distribution (in composites), and grain size of the products. The microstructural features of the products of synthesis conducted using the HEBM precursors are dramatically different from those of the products formed from non-milled mixtures. HEBM powders are also suitable as feedstock materials for depositing coatings by thermal spraying. The emerging applications of HEBM powders and future research directions in this area are discussed.

「データ科学と粉体工学の融合」解説小特集について

「データ科学と粉体工学の融合」解説小特集について

Segregation dynamics of the binary-size granular system in a split rotary drum

Driving and controlling the segregation of particles with different properties in a rotary drum is theoretical and challenging work in powder technology. In this work, a novel split drum composed of two counter-rotating sub-drums was explored to drive the size-induced axial segregation of particles. DEM (Discrete Element Method) simulations were performed to study the particle dynamic and segregation performance in the split drum. Then, the influence of drum speed and the speed ratio between two sub-drums was analyzed. The analysis of the segregation process shows that binary-size particles in the split drum have a faster and better axial segregation than that in the conventional drum, small particles tend to concentrate near the split of the drum. The region-averaged velocity of large particles near the split is smaller than that at both ends of the axial segregation region. The results obtained indicate the width of the axial segregation region increases with the increase of drum speed. When two sub-drums rotate at different speeds, the band of small particles moves toward the low-speed sub-drum, small particles tend to be concentrated in the low-speed sub-drum, and large particles tend to accumulate in the high-speed sub-drum.

A Study on the Roll Manufacturing Technology Applying Powder Flame Spray Coating Technology of Ni-Based Alloy Powder

A Study on the Roll Manufacturing Technology Applying Powder Flame Spray Coating Technology of Ni-Based Alloy Powder

Influence of Mixers on Dry Dispersion of Nanoparticles in the Cementitious Composites

Nanomaterials are gaining prominence in industries such as construction and medicine. Several parameters like durability and early strength development can be enhanced through the incorporation of nanomaterials into cementitious composites. The major challenge is to achieve uniform dispersion of nanomaterials within the composite’s matrix. The present study is an interdisciplinary research which combines concrete technology and nanotechnology with powder technology to develop a blended binary mixture in powder form with uniform dispersion of nano-silica (NS) as the active ingredient with the cement as the primary ingredient. The fundamental idea of this research is to understand the influence of mixers on the mixing pattern and the dead zones. For this purpose, the powder blending in conical mixer and mortar mixer were simulated using discrete element method (DEM) based software and it was capable predicting the mixing pattern and dead zones of the mixers.

Evaluation of Rare-earth Sesquioxides Nanoparticles as a Bottom-up Strategy Toward the Formation of Functional Structures

Background: The strategy to form functional structures based on powder technology relies on the concept of nanoparticles characteristics. Rare-earth sesquioxides (RE2O3; RE as Y, Tm, Eu) exhibit remarkable properties, and their fields of application include energy, astronomy, environmental, medical, information technology, industry, and materials science. The purpose of this paper is to evaluate the characteristics of RE2O3 nanoparticles as a bottom-up strategy to form functional materials for radiation dosimetry. Methods: The RE2O3 nanoparticles were characterized by the following techniques: XRD, SEM, PCS, FTIR, ICP, EPR, and zeta potential. Results: All RE2O3 samples exhibited cubic C-type structure in accordance with the sesquioxide diagram, chemical composition over 99.9 %, monomodal mean particle size distribution, in which d50 value was inferior to 130 nm. Among all samples, only yttrium oxide exhibited an EPR signal, in which the most intense peak was recorded at 358mT and g 1.9701. Conclusion: Evaluating nanoparticle characteristics is extremely important by considering a bottom-up strategy to form functional materials. The RE2O3 nanoparticles exhibit promising characteristics for application in radiation dosimetry.

Electrochemical Behavior of Cu-MWCNT Nanocomposites Manufactured by Powder Technology

This paper presents an experimental investigation of the fabrication of Cu–multi-walled carbon nanotube (MWCNT) nanocomposites prepared via the electroless chemical deposition technique followed by the powder metallurgy (PM) method. To enhance the dispersion and wettability of MWCNTs with a Cu matrix, MWCNTs were given an electroless coating of Ag nanoparticles. MWCNTs with 0.4, 0.8, and 1.2 wt.% were first coated with 5 wt.% Ag nanoparticles, then mechanically milled with Cu nanoparticles using a 10:1 ball-to-powder ratio for 60 min at 300 rpm. The mixed samples (35 g) were subjected to a compression pressure of 700 MPa and sintered at 950 °C in a hydrogen-inert gas furnace. Mapping and microstructure analyses were conducted to analyze the constituents’ homogeneity. In addition, the electrochemical properties and corrosion resistance of specimens were investigated. The results revealed that the relative density decreased by raising the MWCNTs’ content. Electrical resistivity increased gradually with the addition of MWCNTs coated by Ag nanoparticles, and the thermal conductivity decreased. It was also revealed that the smallest corrosion rate could be obtained for the sample with 1.2 wt.% MWCNTs, which is the appropriate rate for the electrochemical deposition.

Effects of different drying methods on the quality of daylily powder

Daylily is an edible flower in China. Daylily powder is prepared from the flowered or damaged by-products during its processing, which accounts for 10% of the total amount. In order to optimize the drying methods, the powder properties, internal structure, nutrition, and color of daylily powder prepared by natural air drying (ND), hot air drying (HD), vacuum freeze-drying (FD), and spray drying (SD) were studied and compared. The results showed that different drying methods had no effects on the internal structure of daylily powder. The diameter, bulk density, water holding capacity, oil holding capacity, and resting angle of daylily powder treated by four drying methods were significantly different. The nutrient indexes and color of daylily powder were significantly changed after different drying methods. HD prepared daylily powder can keep higher total protein, total sugar, and vitamin C; ND and FD prepared daylily powder had higher amino acid content and better flavor retention, while SD prepared daylily powder had smaller particle size, larger specific surface area, lighter color, and strong water and oil retention, which is more favorable for its use as a food additive. Compared with the other three methods, SD has obvious advantages and can be used as the optimal drying technology of daylily powder. The development and utilization of the waste daylily resources could be improved by using the pulverizing technology. This paper provided theoretical and technical support for the full utilization of daylily resources. The purpose of the study was to grow the daylily industry chain, Putting discarded daylily to comprehensive use. Novelty impact statement Powder processing is currently the best way to make full use of the abandoned damaged and flowered daylily resources and improves the added value.SD has obvious advantages and can be used as the optimal drying technology of daylily powder.

Natural Dyes Utilization and Production Technology for Dye-Sensitized Solar Cell

Dye-sensitized solar cell (DSSC) provides high ability of renewable energy generation. One of the main factors affects the performance of DSSC is the type of dye applied as a sensitizer. Natural sensitizers have become a major concern due to the widely availability in the world and environmentally friendly characteristic. However, the need to improve the natural dyes based DSSC performance is very important. This review was conducted to present the recent studies in natural dyes utilization and performance for DSSC application. The short overview of DSSC is also provided. In addition, alternative natural dyes in the form of powder, process and production technology with their strengths and the weaknesses are also discussed.

Innovative liner concept using friction powder for increasing of broadband noise absorption. Applications for broadband noise absorption in fan duct

This paper presents research related influence of friction powders on enlarging the absorption band of acoustic liners used for reduction of tonal noise in fan duct of aero-engine. Kundt tube measurements done at COMOTI using fine powders (granules) made of various light-weight materials placed in the honeycomb cells of SDOF liners have shown a considerable broadening of the absorbed band of frequencies without a significant decreasing of absorption at the resonance frequency. Although the phenomenon is generally present for any type of powder, it was observed that for some powders the absorption is higher than for others. On the other hand, it was observed that the effect of the filling percentage of the cavity is important. Then, experiments done at the grazing flow facility of CNRS-Le Mans University have shown that the phenomenon is also present for high acoustic incident levels (up to 140dB) and M=0.13 while it still depends by the nature of powder material. The best results were obtained for the cork powder when the honeycomb is filled with powder at 66% of its height. For this material, the broadening of the transmission loss well was maximum. This phenomenon could be explained by the apparition of friction between powder granules which are taking place at very low scale consuming the noise power on a broader range of frequencies. It is supposed that the friction between the particles of powder have major influence because the best noise absorption was obtained for powders with a large distribution of particles’ dimensions while for particles with a small dimensional distribution (expanded polyester balls, for example) the transmission well broadening was smaller. The friction powders technology is simple and can be easily adapted to existing acoustic liner technologies with small manufacturing costs. This feature is conferred by the fact that powders can be easily poured in the honeycombs at the required height. The friction powder technology can be applied not only for the fan duct. In future, it could also be applied for reduction of jet noise reflected by pressure side of wing and for cabin noise reduction.

Relationship between Kyoto University and Hosokawa Micron Corporation & Hosokawa Powder Technology Foundation through the Powder Technology

Relationship between Kyoto University and Hosokawa Micron Corporation & Hosokawa Powder Technology Foundation through the Powder Technology

Optimization of mechanical wear resistance for recycled (Al-Mg-Si) reinforced SiC composite material using PM method

Abstract Recently, the increasing demand for advanced materials around the world led to search on require and optimal materials characteristics. An alloy (Al-Mg-Si) named hindalium was used in this study which made from aluminum recycling (aluminums sandwich panel plates). In addition, powder technology was applied to investigate the effect of adding silicon carbide (SiC) particles on the composite properties that enter in fabricate of disc brake rotors. The main reason to use this technology is a single material cannot meet the demands of an extreme engineering setting that encourage towards necessitating the use of composites. Metal matrix composites are a type of material that has a lot of potential for components and structural applications that require a lot of unique modulus, strength, and durability as well as in the same time being light in weight. The composites materials of metal base with good properties are becoming now widely used in several industrial sectors due to their high mechanical properties and resistant to wear. Al-Mg-Si alloys are a common material category because of their inherent hardness, and corrosion resistance. The properties of hardness, wear rate, and microstructure are the physical and mechanical tests were performing in this study. It is indicated that the modeling with using a Genetic Algorithm is the best solution to choose the samples that have been prepared. According to the results, it was observed that the hardness increased by 14% at 15%SiC content and the wear rate decreased by 17% as comparing with the base alloy used in this study.

Enhancement the Biological Behavior of Titanium Dental Implants by Laser Pulses Treatment

The long-term success of dental implants largely depends on rapid healing with safe integration into the jaw bone. Geometry and surface topography are crucial for the short and long-term success of dental implants. This work aim to enhancing clinical performance of titanium dental implants by laser Pulses treatment to provide bone in a faster and improved osseointegration process. The results show that using different manufacturing processes (machining and powder technology) produced topographical differences. The topographical change observed from powder technology method was more than the machined one. Also Strong titanium oxide layer was observed after laser pulsed resulted in improving surface roughness and topography and it was the method of choice for complex surface geometries providing energy focused on one spot especially in the inside of implant thread. The release of Ti ion rise in first three days and after that released of Ti ions begins to stabilize after laser treatment. Finally, the histological view of implant samples after 4weeks of implantation, showed active bone formation in all implant surface which give clear indication of tissue acceptance and the appearance of mature bone was observed after laser treatments at short implantation periods.

Production and Characterization of Austenitic Stainless Steel Cast Parts Reinforced with WC Particles Fabricated by Ex Situ Technique.

In this work, austenitic stainless steel specimens were locally reinforced with WC particles. The reinforcements were fabricated via an ex situ technique based on powder technology. Mixtures of WC, Fe, and M0101 binder were cold-pressed to obtain powder compacts. After debinding and sintering, the porous WC–Fe inserts were fixed in a mold cavity, where they reacted with liquid metal. Microstructural analysis was conducted for characterization of the phases constituting the produced reinforcement zone and the bonding interface. The results revealed that the reinforcement is a graded material with compositional and microstructural gradients throughout its thickness. The zone nearest to the surface has a ferrous matrix with homogeneously distributed WC particles and (Fe,W,Cr)6C and (Fe,W,Cr)3C carbides, formed from the liquid metal reaction with the insert. This precipitation leads to austenite destabilization, which transforms into martensite during cooling. A vast dissolution of the WC particles occurred in the inner zones, resulting in more intense carbides formation. Cr-rich carbides ((Fe,Cr,W)7C3, and (Fe,Cr,W)23C6) formed in the interdendritic regions of austenite; this zone is characterized by coarse dendrites of austenite and a multi-phase interdendritic network composed of carbides. An interface free of discontinuities and porosities indicates good bonding of the reinforcement zone to stainless steel.

Definition of a unified material model for cellular materials with high morphological and topological dispersion: Application to an AA7075-T6 aluminium foam

The compression behaviour in quasi-static and dynamic conditions of cellular materials is crucial for their applications both for ensuring structural strength and high energy absorption capability. Despite the recent progress made in understanding the experimental observations, analytical and numerical modelling still requires improvements in the Representative Volume Element (RVE) identification that can be uncertain due to the limited dimensions of the investigated specimens and to the cell inhomogeneity.The objective of this paper is to implement a material model able to consider the statistical distribution so that its effect can be quantitatively highlighted, mitigating uncertainty of the RVE identification.The applied methodology started with morphological and topological analyses on samples extracted from an ingot of AA7075T6 foam, which was manufactured by compact powder technology. Quasi-static and dynamic experimental compression tests have been carried out and compared with 3D mesoscale numerical simulations in order to correlate the mechanical behaviour of the foam to the cell characteristics. Finally, an equivalent material model, which is a function of the statistical distributions of cells morphology and topology, has been proposed and analytically verified.

The effect of chit powder technology in the treatment of burn hazards victims: A systematic review

Objective: In order to heal burn wounds, many researches have been done, including the use of biological scaffolds due to their ability to achieve the desired properties. Owing to the appropriate biological properties of chitosan such as biocompatibility and antimicrobial properties as well as the promotion of wound healing in biomedical applications, we aimed to perform a systematic review to investigate the effect of this technology on the treatment of burn hazards victims. Methods: The present research was conducted in 2020 as a systematic review of studies related to the effect of chitosan on burns. In this study, Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) and Critical Appraisal Skills Programme (CASP) guidelines were used to assess the articles. The key words "Chitosan," "Chitin," "victim," "Injury," "Burn," "Heal," "wound" "treat," "hazard," and "care" were used in combination with the Boolean operators OR and AND. The ISI web of science, PubMed, Scopus, Science Direct, Ovid, Pro Quest, Wiley and Google Scholar were searched. Results: Recently, chitosan and its derivatives have been proposed as suitable candidates for scaffolding and can be used as temporary scaffolds to modify and stimulate the growth of new tissues. Studies to demonstrate the use of chitosan in the treatment of burns have been limited to research on animal models and have been superior to conventional therapies in terms of time, pain, and efficacy. Conclusion: The effect of chitosan on burns has been positive in animal models and has accelerated wound healing. Since the main ingredient of chit powder is chitosan and due to the limited studies done on humans, it cannot be said with certainty that the use of chitosan and its derivatives to treat burns is better than other ways to treat burns.

Mechanical, morphological, and fracture-deformation behavior of MWCNTs-reinforced (Al–Cu–Mg–T351) alloy cast nanocomposites fabricated by optimized mechanical milling and powder metallurgy techniques

AbstractThe carbon nanotube (CNT) is becoming more popular due to their low-density, high-strengthetc.Among CNTs, multi-walled carbon nanotubes (MWCNTs) are gaining more importance due to their enhanced thermal and electrical conductivity. The present research is exploring the applicability of MWCNTs reinforced with AA2024-T351 alloys for electromechanical applications. This study is currently undertaken for using MWCNTs as a reinforcing particulate for the purpose to enhance the characteristics including low density, high strength, and hardness together with excellent thermal and electrical conductivity of the aluminum alloy matrices. Therefore, this article provides a state-of-the-art experimental approach to fabricate and furthermore, to evaluate the mechanical characteristics, microstructural analysis, and fatigue behavior of Al–Cu–Mg–T351/MWCNT composites under both the mechanical and thermal loading by utilizing powder technology processing route. The uniform dispersion of CNTs has been exposed using ball milling process. Results revealed that the MWCNTs provide extraordinary synergistic strength, enhances fatigue resistance, creep resistance, ductility, and other mechanical characteristics of the aluminum-based composites. The mechanical loading of the composite exhibited increased properties as compared to thermal-loaded aluminum-MWCNT composites. Findings conclude that the maximum hardness of 35Hv obtained for sintered AA2024-T351 and 45Hv for 0.5% MWCNT heat-treated samples indicate that the addition of MWCNT enhances the hardness which may be because CNT is evenly dispersed at the interfacial space. Maximum UTS of 105.21 MPa was obtained with 0.5% MWCNT for sintered composites. Microstructural analysis of the Al–Cu–Mg–T351/MWCNTs composite exhibits reasonably uniform distribution, void formation, and good interfacial bonding. X-ray Diffraction method patterns of fabricated composite shows that the CNT is present at 2β= 23.6 and 44.6°, whereas high peaks of aluminum are present at uniform dispersed positions. Transmission electron magnifying instrument study further substantiates the above research. Fracture micrographs of the Al–Cu–Mg–T351/MWCNTs composite portray the resistant nature of the nanotubes due to the presence of CNTs, Al–Cu, and aluminum carbide elements in the alloy and the reactions that happened during heat treatment. This significant improvement was attributed to the shear interactions among the constituents and high load carrying capacity of the CNT, uniform dispersion, and interface bond strength among the matrix and constituents. The findings in the study will undoubtedly be beneficial for the development of high-strength, MWCNTs/Al–Cu–Mg–T351, matrix composites in future for multifunctional applications on broader spectrum.

Using the Instrumented Indentation Technique to Determine Damage in Sintered Metal Matrix Composites after High-Temperature Deformation

The paper shows the applicability of data on the evolution of the elastic modulus measured by the instrumented microindentation technique to the determination of accumulated damage in metal matrix composites (MMCs) under high temperature deformation. A composite with a V95 aluminum alloy matrix (the Russian equivalent of the 7075 alloy) and SiC reinforcing particles is used as the research material. The metal matrix composite was produced by powder technology. The obtained results show that, under macroscopic compression at temperatures ranging between 300 and 500 °C, the V95\10% SiC MMC has the best plasticity at 300 °C. At a deformation temperature of 500 °C, the plastic properties are significantly lower than those at 300 and 400 °C.

「粉体工学と医療技術の融合」解説小特集について

「粉体工学と医療技術の融合」解説小特集について