Heat Treatment Of Materials Research Articles

An integrated approach to reconstruct the role of the heat treatment within the reduction sequence of chert artefacts: The case of the early Neolithic site of Lugo di Grezzana (north‐eastern Italy)

AbstractThe lithic assemblage from the well‐known site of Lugo di Grezzana (Italy) attributable to the Fiorano group (5,300–4,900 BC cal) is analysed to shed new insights on the early Neolithic lithic technology in North‐Eastern Italy. Techno‐typological data are discussed allowing detailed reconstruction of the reduction sequence, thanks also to several refittings. A complex laminar production with several technical objectives has been identified. Whereas clues for the heat treatment of lithic materials have been identified, we verified it by a combined experimental approach. In the first place, we used density measurements, which already proved to be useful for prescreening analysis, to detect potentially heated artefacts. Afterward, we performed Fourier Transform Infrared (FT‐IR) spectroscopy tests to assess the actual (de)hydration condition of the siliceous materials. Reflectance spectra have been acquired, analysing any item and avoiding any constraint related to both morphology and thickness of the sample. The archaeometric results, combined with the reduction sequence reconstruction, provide new indications on the technical capabilities and knowledge of the human groups that inhabited the region during the early Neolithic.

Microstructure, mechanical properties, and corrosion performance of additively manufactured CoCrFeMnNi high-entropy alloy before and after heat treatment

Equiatomic CoCrFeMnNi, one of the well-known high-entropy alloys, possesses attractive mechanical properties for many potential applications. In this research, the effects of heat treatment on additively manufactured CoCrFeMnNi materials were studied. A pilot experiment was conducted to select two selective laser melting (SLM) conditions of different laser scanning speeds based on the density and porosity of obtained materials. Thereafter, microstructure, tensile properties, impact fracture, microhardness, and corrosion resistance were investigated for the materials obtained under the two selected SLM conditions, with and without heat treatment. It was discovered that while the texture with a strong <100> alignment was observed in both as-built and heat treated materials, the texture of heat treated materials was stronger. Also, heat treatment drastically improved the ductility of as-built CoCrFeMnNi by 23 – 59% for the selected SLM conditions, while the ultimate tensile strength showed only negligible change. The increase of ductility was believed to result from the release of residual strain and the increase of average grain size after heat treatment. Moreover, heat treatment was able to bring noticeable improvement in energy absorption for the as-built CoCrFeMnNi, reflected by 11 – 16% more energy absorption. Besides, all studied materials showed signs of ductile fracture, but more signs of brittle fracture, such as cleavage facets, were found in the as-built materials as compared with the heat-treated materials. In addition, higher laser scan speed was found to cause moderate reduction in corrosion resistance. Effect of heat treatment was also negative and mild for lower scanning speed case. However, the highest reduction in corrosion resistance was observed after heat treatment of the high laser scanning speed case.

Crystalline/amorphous LiCoO2–Li2SO4 nanoheterostructured materials for high-voltage all-solid-state lithium batteries

Amorphous active materials have been developed for high-performance lithium and sodium secondary batteries to achieve a higher capacity, higher rate performance, and longer cycle life than those of crystalline active materials. In this study, a new function of amorphous active materials was explored through the heat treatment of pseudobinary amorphous materials (for example, LiCoO2–Li2SO4). Additionally, active materials with crystalline/amorphous nanoheterostructures, in which the nano-LiCoO2 domains were dispersed in a Li2SO4-rich matrix, were demonstrated. In all-solid-state batteries with sulfide solid electrolytes (SEs), the crystalline/amorphous active materials reduced the interface resistance of the active material and SE when compared with that of Li. High electrochemical performance was achieved using the Li2SO4-rich matrix, which served as an interfacial stabilizer. In summary, this paper reports a new strategy based on annealing amorphous materials for developing active materials with nanoheterostructures for high-performance energy storage devices.

Investigation of the Kinetics of Heat and Moisture Exchange during Heat Treatment and Drying of Thin Wet Thermal Insulation Materials

. The kinetics of drying of thin heat-insulating flat materials has been studied. The approximation of the drying rate curve by various methods is presented. When determining the duration of drying by zonal methods, the equation of the drying rate with the drying coefficient was used. The techniques of processing experimental data by zonal methods of A.V. Lykov, V. V. Krasnikov and by the method of B. S. Sazhin are described. The equation obtained by processing experimental data using the B. S. Sazhin method to determine the duration of the drying process contains only the amount of moisture content of the heating of the material, there is no need to know the critical moisture content. Dependences for calculating the drying coefficient by zonal methods are given. According to the results of the experiment, formulas for determining the duration of heat treatment of thermal insulation materials are presented. The dependence of the relative drying rate on the relative moisture content is presented as well. The processing of experimental data by generalized complex variables creates invariance conditions that allow moving from one variable to another, from one coordinate system to another, which reduces the number of experiments. Formulas with complex variables for determining the duration of drying of materials are given. Based on the drying kinetics equation by A. V. Lykov and the equation for the relative drying rate by G. K. Filonenko, equations are given for determining the density of heat fluxes, the intensity of moisture evaporation and temperature for the period of decreasing drying rate. Solutions of experimental equations are analyzed. The error caused by the processing of experimental data is established. Verification of the reliability of the empirical equations obtained is presented and comparison of the calculated values of the main parameters of the drying kinetics with the experiment is carried out.

Application of microwave in manufacturing technology: A review

In todays world due to wide experimentation of materials and wider application in various field and with introduction of reduced production or manufacturing costs, and processing lead times, newly developed processing technology is what is required with these advantages. The newly developed processing techniques should be such that it should be widely acceptable for all types of materials including metals, non-ferrous metals, non-metals etc. Such processing methods are many but microwave processing is one of the fastest and latest emerging manufacturing technology that has found new application in material joining, casting, heat treatment, cladding, sintering, machining and drilling. In comparison to other conventional processes, microwave processing of materials not only enhances the mechanical properties but also redues the defects and has certain economical advantage in power and time savings. In comparison to conventional processes, microwave processing due to hybrid and selective heating, the parts produced has more uniform, axial, cellular and homogeneous type of structure is obtained. It has found application in not only in food processing industry but wide application has been found in manufacturing industry. Though other processes are available in the industries like electric furnace and ohmic resistance heating but the microwave due to its properties like penetration radiation, controllable electric field distribution, rapid heating, selective heat, self limit reactions with advantage of lower environmental impact has been extensively used for industrial and material processing applications. This work describes the review focusses on technological advancement of microwave processing of materials and their application in manufacturing applications in industries.

Utilization of silica-enriched filter cake industry by-products as partial ordinary portland cement replacement

In recent years, industrial byproducts have been converted into useful and valuable commercial items. Reusing these byproducts plays a crucial role to ensure the circular economy and thereby safeguard the environmental impacts. In Ethiopia, the Aluminate Sulphate chemical factory disposes of filter-cake waste materials in landfills that have high silica content. The factory is using pure kaolin and other raw materials for the production of Aluminum Sulphate and Sulphuric Acid by burning at high temperatures. By-products materials were collected from the factory and then calcined (post-treated) at 600 °C for 2h in a muffle furnace. From Atomic Absorption Spectrometry measurement result, it is confirmed that the post-treated (at 600 °C/2h) silica-enriched filter-cake waste materials have a similar composition to Metakaolin (MK). Post-treated filter cake (named MK) became more amorphous having high reactive silica with very low impurities as it was calcined and quenched rapidly. In this study, the properties of blended Ordinary Portland Cement (OPC)-mortar samples were investigated with the addition of heat-treated filter cake waste materials (0%–20%) as a partial OPC replacement. X-ray diffraction, Fourier Transform-Infrared Spectroscopy, Differential Thermal Analysis, Scanning Electron Microscope, and Atomic Absorption Spectrometry were used to investigate the properties of mortar samples that contain post-treated filter-cake (MK) materials and OPC-cement. The flexural and compressive strengths of 10% MK + 90% OPC-mortar samples were enhanced at early curing ages, 7 & 28 days. Moreover, the flexural and compressive strengths of OPC mortars with 15% MK have been improved at 28 days of curing age. However, 20% MK + 80% OPC blended mortars have not shown any improvement in mechanical properties. Setting time, soundness, water absorption, and apparent porosity of cement pastes with the addition of post-treated filter cake (MK) are also analyzed.

High-temperature failure and microstructural investigation of wire-arc additive manufactured Rene 41

In developing a wire-arc plasma direct energy deposition process for creep-resistant alloys used in high-speed flight applications, structures were built from nickel-based superalloy Rene 41. Samples of additive manufacturing (AM) material were analysed for their microstructural and mechanical properties, in both as-deposited (AD) and heat-treated (HT) conditions. Tensile specimens were tested at room temperature, 538, 760, and 1000 °C. Macroscopically, large columnar grains made up of a typical dendritic structure were observed. Microscopically, significant segregation of heavier elements, grain boundary precipitates, and secondary phases were observed, with key differences observed in HT material. There was a clear distinction between failure modes at different testing temperatures and between AD and HT variants. A fractographic investigation found a progressive move from brittle to ductile fracture with increasing testing temperature in both AD and HT conditions, as well as microstructural features which support this observation.

Technology for combining the processes of salting and heat treatment of offal in a microwave installation

Relevance. With the increase in livestock production, the question of the rational use of by-products arises. Currently, such raw materials are mainly sold without processing. To increase the profitability of production, it is proposed to sell the offal in boiled form. One of the ways to obtain boiled products from small-sized meat raw materials with good consumer properties is the use of endogenous heating during massaging in brine.Methods. Theoretical studies were carried out by analyzing the physical processes associated with the propagation of electromagnetic waves in media with losses; the mass-transfer processes in raw materials with a curing substance during endogenous heating were studied. The visualization of the distribution of the electromagnetic field (EMF) in a cylindrical slotted resonator, the calculation of the intrinsic quality factor and the electric field strength (EF) were carried out using the CST Microwave Studio program. The substantiation of the operating modes of the installation was carried out through regression models obtained using a threefactor experiment of type 23 in the programs Statistica 12.0, Microsoft Excel 10.0. In the Compass-3D 18 program, three-dimensional modeling of the structural design of cylindrical slotted resonators-drums was carried out. Electromagnetic safety was evaluated by the results of studies of the power of the radiation flux by the installation using a PZ-33M, PZ-41 measuring devices.Results. The operating modes of the developed and manufactured microwave installation with a slotted cylindrical resonator-drum for heat treatment and massaging of raw materials are established, taking into account regression models. They are: productivity 10 kg/h; specific power 1.6 W/g; processing time 1.0 h, at a salt concentration of 12.88%; specific energy costs 0.165 kW·h/kg; frequency of rotation of the resonator-drum 23 rpm.

Optimization of structural and technological modes of operation of the microwave wax melter

Introduction. The research is aimed at substantiating the optimal design and technological parameters and operating modes of the microwave installation being developed, designed to implement the process of processing wax raw materials with preliminary separation and preservation of honey fraction contained therein.Methodology. The effective modes of heat treatment of apiary raw materials in a microwave wax melter were determined through regression models obtained during the implementation of the matrix of threefactor active planning of a multifactorial experiment.Results. The main factors influencing the process of heat treatment of the sail are revealed: the specific power of microwave energy generators, the duration of exposure to the electromagnetic field of super high frequency, the humidity of the feedstock. The expediency of implementing microwave technology for processing wax raw materials in a two-module installation containing hemispherical resonators to ensure continuous operation in compliance with electromagnetic safety, as well as control of technological parameters is proved.

Creep Analysis and Microstructural Evaluation of a Novel Additively Manufactured Nickel-Base Superalloy (ABD®-900AM)

Abstract Nickel-base superalloys containing 30 to 50% gamma prime (γ') volume fraction are typically used in hot section components (e.g., guide vanes or blades) for power generating gas turbines, and suitable time-dependent properties are required for long-term elevated temperature operation. Additive manufacturing (AM) has recently been used to develop complex hot-section parts utilizing innovative designs with enhanced cooling features which improve efficiencies by reducing cooling air consumption. To further explore the opportunity to improve time-dependent AM superalloys, this paper focuses on a fundamental creep study and characterization of a novel nickel-base superalloy (ABD-900AM) that was manufactured using a laser-based powder bed fusion (LBPBF) AM process. The material was subjected to a subsolvus solution anneal and multistep aging heat treatment (HT) to produce a bi-modal distribution with ∼35% volume fraction of gamma prime without postprocessing hot isostatic pressing (HIP). Microstructural characterization was carried out for the as-built and fully heat-treated structures, and a creep-rupture test program was conducted to study the resultant creep properties. Activation energies and stress exponents in addition to rupture strength and deformation resistance were compared to traditionally cast IN939 and IN738 materials. After testing, specimens were evaluated using a variety of microscopy tools to determine location and features associated with creep damage. The optimized chemistry for ABD-900AM was printed crack free and fully dense in contrast to studies on similar alloys where significant process development and postbuild heat treatments were required. High-temperature mechanical properties in the heat-treated material showed some decrease in creep strength when compared to traditional casting. This strength and rupture life debit was dependent on build orientation, but a considerable increase in creep ductility was observed due to differences in the microstructure when compared with similar AM alloys. Analysis of creep data showed differences in creep mechanisms compared to traditional cast alloys. The relationship between microstructure and creep mechanisms is discussed, and ongoing work to further improve rupture strength through heat-treatment optimization will be highlighted.

Enhancement of electrical conductivity, optical band gap and ferromagnetic properties by co-doping of Co and Ti ions in canted antiferromagnetic hematite (α-Fe2O3) system

The Co and Ti ions have been co-doped at the sites of Fe3+ ions of α-Fe2O3 (hematite) structure by employing mechanical alloying technique and post heat treatment of the as-alloyed material under vacuum and air. The ratio of Co and Ti ions has been maintained at 50:50 in order to compensate charge disproportionate effect in the composition of α-Fe2-xTix/2Cox/2O3 (x = 0.2, 0.4, 0.6). The X-ray diffraction pattern and Raman spectra at room temperature have confirmed the formation of hematite (rhombohedral) structure as the major phase and a minor amount of TiO2 phase in some of the prepared samples. X-ray photoelectron spectra (XPS) have provided useful information of the chemical environment and electronic charge state of the metal (Co, Ti, Fe) ions in the lattice structure. The XPS spectra confirmed tetra-valence charge state of Ti ions, whereas a mixed valence charge state of Fe3+(Co2+) and Fe(2+δ)+(Co(3−δ)+) has been indicated for the Fe and Co ions. The mixed valence charge states indicated the enhancement of covalent character of the metal-oxygen bonds. In this work, details of the lattice structure, chemical composition, charge state of ions, optical, electrical and magnetic properties have been presented.

SCIENTIFIC AND TECHNICAL BASIS FOR THE DEVELOPMENT OF INSTALLATIONS WITH MICROWAVE POWER SUPPLY FOR PROCESSING RAW MATERIALS AT AGRICULTURAL ENTERPRISES

The developed methodology of designing installations with microwave power supply for heat treatment of raw materials of agricultural enterprises is described. The scientific problem is the low energy efficiency of installations designed for heat treatment of raw materials with steam-water mixture, convective heat supply, the absence of continuous-flow installations for farms that ensure the preservation of consumer properties of the heat-treated product at reduced operating costs. (Research purpose) The research purpose is developing the scientific and technical foundations of installations with microwave power supply for processing raw materials at agricultural enterprises. (Materials and methods) Carried out three-dimensional modeling of the structural design of the installations in the Compass 20 program, determined the electrodynamic parameters of the “generator-resonator” system in the CST Microwave Studio program. (Results and discussion) Resonators of different structural designs have been developed for different types of raw materials, in which electromagnetic safety is ensured by forbidden waveguides, decelerating systems in the form of a chain of connected resonators, comb, cylindrical spiral, rod ring, counter pins. In resonators with curved surfaces, several magnetrons of the same frequency or operating at close frequencies with dissectors were used to change the frequency of the generator and increase the number of types of vibrations, and mixing, transporting mechanisms that allow maintaining the well of the technological process less than 0.5 and observing the dimensions of the raw materials in accordance with the depth of penetration of the wave. It was found that when using several magnetrons, the concentration of the electromagnetic field energy in the resonator volume and the reduction of radiation losses are achieved using ceramic reflectors. The values of the intrinsic Q-values of the resonators were determined to evaluate the thermal efficiency coefficient. (Conclusions) Using the examples of an animal colostrum defroster, instant milk pasteurizer and a three-section hop dryer with air-cooled magnetrons, the implementation of the scientific and technical fundamentals of designing microwave equipment for processing raw materials of agricultural enterprises was shown. It was revealed that they provide ways to achieve a continuous mode of operation of the equipment in compliance with electromagnetic safety without a shielding housing by implementing metal-dielectric resonators with decelerating systems and ceramic reflectors with an optimal arrangement of waveguides with air-cooled magnetrons on the curved surfaces of the resonators.

Термообработка слизистых субпродуктов под воздействием электрофизических факторов: разработка установки

Low efficiency of equipment for heat treatment, disinfection and removal of unpleasant odour of substandard mucous by-products urges the development of an installation that provides for the complex effect of ultra-high frequency electromagnetic field, ozone and bactericidal flow of ultraviolet rays. The paper presents the technology and describes the installation developed by the authors. The installation ensures electromagnetic safety and uniformity of loading according to the penetration depth of the wave. The duration of raw material treatment is matched with the specific power of the microwave generator, the power of the lamps and with the rotation frequency of the compartment disc. The electric field strength has been studied in the CST Microwave Studio program. The developed installation contains a resonator in the form of a flattened spheroid with diameters of the main axes multiple of half the wavelength. Magnetrons are placed on the upper surface of the spheroid along the perimeter. On the inner surface of the spheroid, where there are corona needles, ring electro-gas-discharge lamps powered from pulsed modeled high-frequency generators are uniformly installed along the perimeter through the gap. The source of radiation in the bactericidal lamp is an electric discharge in a mixture of mercury vapour and argon. A fluoroplastic perforated disc is installed at the level of the large diameter of the spheroid, on which mucous by-products are treated. The conducted research shows that the intrinsic factor of quality of the spheroid resonator is 9000. The heat treatment and disinfection of raw materials is most effective at the plant productivity of 50 kg/h, electric field strength of 3 to 4 kV/cm, disc rotation frequency of 0.17 to 0.2 rpm and a specific power of the microwave generator of 1.2 W/g. Power consumption amounted to 6.6 kW, while energy costs were 0.132 kW∙h/kg.

Evaluation of the influence of heat treatment modes of steel 60С2A on its mechanical characteristics and increasing the performance of the generator of hydrodynamic oscillations

The article considers a variant of the drilling head, in which a generator of hydrodynamic oscillations is placed. The main task of research is to select the mode of heat treatment of the resonator material, which ensures an increase in its plasticity. Due to this, an increase in the service life of the resonator is expected as a result of a decrease in sensitivity to stress concentration in the region of defects, including cracks. The main part of the research is related to the determination of the 60С2A steel mechanical characteristics, both in the state of delivery and after heat treatment. With the help of metallographic analysis, the author showed that the proposed options for heat treatment don’t lead to deviations in indicators from the requirements of regulatory documentation. It was determined that the highest value of the plasticity index is realized during heat treatment, which includes annealing + hardening + tempering. A variant of heat treatment of steel 60C2A is proposed, which provides an increase in the service life of the drilling head. Keywords: heat treatment, steel 60С2A, metallographic analysis, tensile test, mechanical characteristics, plasticity index

Root cause of embrittlement of in-service exposed high pressure steam pipeline

A segment of tube cut off from the high pressure steam pipeline was subjected to routine basic material tests, which resulted in very low impact energy of the pipe material (low-alloyed Cr steel). A part of the segment (and a comparative non-operated sample) was then subjected to detailed mechanical tests (including creep), metallographic investigations and fractographic analyses with an aim to determine a root cause of the embrittlement. The results showed that grain boundaries of exposed steel are covered by particles of primary and secondary cementite. However, a matrix is weakened more, therefore a fracture of creep, tensile and impact specimens is always transgranular and the cleavage facets are limited to grain size, if present. Thus, the cause of embrittlement was determined not by a rapid ageing, but by an unsuitable initial heat treatment of the pipe material.

The influence of natural aging of the AW-2024 aluminum sheet on the course of the strain hardening curve

Aluminum sheet drawpieces pressings with the ability to harden precipitation can be shaped from the sheet after annealing or heat treatment. In the second variant during the analysis and design of the technological proces, the change in the material properties of the shaped sheet due to natural aging should be additionaly taken into account. This article presents the results of research on the effect of the natural aging time after heat treatment of AW-2024 sheet material with a thickness of 1 mm on the course of the strain hardening curve. Strain hardening curves were determined on the basis of a uniaxial tensile test. The sheets were tested immediately after heat treatment and during natural aging, i.e. (20, 45, 90 and 120) minutes after heat treatment. The research showed a significant influence of natural aging in the tested range of times after heat treatment on the course of the deformation hardening curve of the sheet material. Based on experimentally determined in particular directions (0, 45 and 90 degrees to the rolling direction) the strain hardening curves, the values of material coefficients as a function of natural aging time were determined for four models of flow stress. Material coefficients in individual yield stress models were determined on the basis of approximation of strain hardening curves using the least squares method. On the basis of the analysis of approximation errors, the accuracy of the tested models of yield stress to describe the course of the hardening curve of the material of the tested sheet in the tested range of natural aging time was assessed.

КОНСТРУКЦИИ СВЧ ЭЛЕКТРОТЕХНОЛОГИЧЕСКИХ УСТАНОВОК С РАБОЧИМИ КАМЕРАМИ ГИБРИДНОГО ТИПА

The article provides information about the design and purpose of microwave electrotechnological installations for thermal and non-thermal microwave modification and about microwave electrotechnological installations with hybrid-type working chambers. The problems of microwave electrotechnological installations with working chambers of hybrid type are formulated. Thus, the high prices of microwave generators reduce the economic efficiency of the installation, additional scientific studies of non-thermal microwave modification are required in order to determine the optimal values for the parameters of the microwave generator and the transport system of the microwave electrotechnological installations. The advantages of microwave electrotechnological installations with hybrid chambers in comparison with microwave electrotechnological installations for heat treatment of dielectric materials and non-thermal processing of polymeric materials are substantiated, which indicates the expediency of their wide distribution in industry and agriculture.

Developing a neural network to model the mechanical properties of 13-8 PH stainless steel alloy

We systematically evaluated the effects of raw material composition, heat treatment, and mechanical properties on 13-8PH stainless steel alloy. 13-8PH is widely used in the aerospace industry for various structural components. Little is known about the predictive modeling of mechanical properties for 13-8 PH per heat treatment. To achieve the desired properties, multiple back-and-forth heat treatments and mechanical tests are often required which utilize significant amounts of resources. Thus, we hypothesized that no specific heat treatment temperature can be used to achieve the desired property ranges across all 13-8PH compositions. We heat treated 13-8PH alloy through solution treatment, cryogenic treatment, and final elevated temperature aging. We conducted double shear testing to measure this mechanical property. Consistent with expectations, experimental data confirmed that no single specific aging heat treatment temperature could be used to achieve desired property range for all compositions. A unique aging heat treatment temperature is required and there is a need to develop a model to predict heat treatment response for each composition. The results of the neural network models were in agreement with our experimental results and aided in the evaluation of the effects of aging temperature on double shear strength. The data suggests that this model can be used to determine the appropriate 13-8PH alloy aging temperature needed to achieve the desired mechanical properties, eliminating the need for many costly trials and errors through re-heat treatments.

A “Zero-Cost” Adsorbing Hydroxyapatite-Based Material from Amazon Fishery Waste for Water Remediation and Nutrient Release for Agriculture

This paper puts forward the use of “low-cost/low-end” hydroxyapatite-based adsorbing materials prepared from Tambaqui fish cleaning residues (i.e., bones) by grinding and/or thermal annealing. The nature of raw materials and treatments practically resulted in a “zero-cost” adsorbent for atrazine pesticide and Co2+ ion remediation in an aqueous solution. Despite the distinctive character of the two contaminants, all adsorptions were found to follow pseudo-second order kinetics and Freundlich isotherm models. Pristine hydroxyapatite proved to be more effective in adsorbing atrazine at low concentrations due to interactions with collagen residues. Conversely, heat-treated materials demonstrated better adsorption performances for cobalt due to the removal of organic residues hindering access to the surface. On the other hand, lower adsorption affinities resulted into a faster and more efficient Co2+ release into water. The different behavior in terms of phosphate and cobalt release shown by the three hydroxyapatite-based absorbents can be exploited for differential liberation of targeted nutrients, with high seed germination rates. Considering circular economic principles, waste-derived hydroxyapatites may be potentially attractive for removing ionic species, minimizing water pollution stemming from heavy industry, and for their subsequent targeted release to edible plants, enhancing agricultural availability of mineral nutrients for soil fertilization.

Development of the Methods of Finishing Non-Woven Fabric With Brass Nanoparticles

Studies have been conducted on the process of obtaining brass nanoparticles by means of reduction with environmentally friendly preparations in order to give biocidal properties to non-woven fabric . The aim of the study is to modify a non-woven material using silver nanoparticles to give it biocidal properties . The effective composite preparation developed for biocidal finishing of textile materials is relatively inexpensive , environmentally and toxicologically safe . Its application opens up prospects for manufacturing a wide range of competitive , environmentally friendly , bio-resistant textile materials for various purposes . Process conditions of antibacterial finishing of textile materials were the followings : an aqueous solution with brass nanoparticles was sprayed onto the surface of a non-woven fabric , then dried and heat treated at 180 °C on a thermal press . To study the biocidal activeness of heat-treated material , a microbiological investigation was carried out . Non- woven fabric processed on the basis of brass nanoparticles obtains pronounced antifungal activeness in terms of investigating C.albicansATCC 2091 and C.albicansATCC 10231 test strains . Also , experiments on toxic and skin-irritating effects of non-woven material processed by the proposed method showed its safety for human health . The developed product based on silver nanoparticles provides high indicators of bio-resistance of textile material and meets the environmental requirements for textile auxiliary substances . In the production of nonwovens , p rocessing with this composition can be combined with the emulsification of a mixture of fibers , or carried out after the formation of the canvas with subsequent heat treatment and calendering .