Showing papers in "Russian Journal of Non-ferrous Metals in 2014"
TL;DR: In this paper, an investigation of carbide-material billets made from powders prepared by the electroerosive dispersion (EED) of tungsten-containing alloys of the T15K6 brand is presented.
Abstract: Results of an investigation of carbide-material (CM) billets made from powders prepared by the electroerosive dispersion (EED) of tungsten-containing alloys of the T15K6 brand are presented. To fabricate the CM powder, the installation for the EED of current-leading materials was used. Distilled water and burning kerosene were used as working fluids in its reactor. Dispersion was performed at the following electric parameters: capacitance of discharge capacitors of 35 μF, voltage of 200–220 V, and pulse-repetition frequency of 30 Hz. It is established experimentally that the CM billets, which were fabricated by cold isostatic pressing the powders prepared from wastes by the EED method at a pressure of 300 MPa and subsequent vacuum sintering at 1500°C for 2 h, have higher porosity (by a factor of 4.22–9.92), a smaller grain size (by a factor of 1.5–3.0), higher density (by 5%), lower ultimate compressive strength (by a factor of 1.2–3.2), and higher microhardness (by a factor of 1.2) compared with the industrial hard alloy of the T15K6 brand.
45 citations
TL;DR: In this paper, the preparation of nanodimensional powders of tungsten carbides, as well as other transitionmetal carbides using plasma-chemical reduction synthesis is investigated.
Abstract: The preparation of nanodimensional powders of tungsten carbides, as well as other transitionmetal carbides, using plasma-chemical reduction synthesis are investigated. The main regularities of preparing powders of specified dispersity and composition are revealed. Characteristic particle sizes of carbides are 40–80 nm. In order to prepare a homogeneous mixture of WC-Co nanoparticles with an exact weight content, the procedure of deposition of cobalt on the tungsten carbide powder with the simultaneous introduction of an additive of inhibitor carbides such as carbides of chromium, vanadium, and tantalum is developed. The prepared powders were investigated using modern methods, including high-resolution scanning electron microscopy and fractional gas analysis.
27 citations
TL;DR: In this paper, a modern market of niobium-and tantalum-based materials is described, the main players on this market are noted, and tendencies in varying the structure of consumption of functional materials based on these metals are considered.
Abstract: Niobium and tantalum are rare refractory metals of large industrial value. Their reserves belong to “critical” raw materials, which leads to the necessity of evaluating the risks associated with the presence of primary and technogeneous raw-material sources of niobium and tantalum and with the influence of these factors on the offer and demand for these metals and their compounds, allowing for traditional and new application fields. World reserves of niobium and tantalum are analyzed and the dynamics of varying the structure of raw materials base and production solutions implemented and proposed for their processing is considered. A modern market of niobium- and tantalum-based materials is described, the main players on this market are noted, and tendencies in varying the structure of consumption of functional materials based on these metals is considered.
20 citations
TL;DR: In this paper, the current state of studies into functional coatings and surfaces using glow discharge optical emission spectroscopy (GDOES) is analyzed and its main principles are described.
Abstract: The current state of studies into functional coatings and surfaces using glow discharge optical emission spectroscopy (GDOES) is analyzed and its main principles are described. With the purpose of determining requirements for the samples and revealing potential possibilities of the method, GDOES studies of coatings with various compositions and structural characteristics fabricated using several methods are performed.
20 citations
TL;DR: In this paper, the effect of SDAS values on the mechanical properties of Yttrium modified casting Al alloys was investigated and the results showed that the strength of the Y modified alloy decreases with increasing the SDAS value.
Abstract: An experimental investigation is carried out in order to measure and thus report the effect of SDAS values on the mechanical properties of the Yttrium modified casting Al alloys. Microstructural features and the alloy composition determine the mechanical properties of the as-cast Al alloys. The solidification rate plays the main role on the microstructural characteristics including primary and secondary dendrites arm spacing (DAS and SDAS), also the fraction, size and distribution of defects, eutectic silicon and intermetallic phases. In this study, Yttrium is used as a chemical modifier to the cast Al alloys in an attempt to transform the acicular shape of the Si to the fibrous morphology. The investigation of the samples show the presence of the pores and voids in the microstructure of the as-cast Y modified alloy. The typical cast microstructure shows dendritic Al accompanied with eutectic Si and Al2Cu, Al15(Fe, Mn)3Si2 and other complex multi-element intermetallic. Based on the findings of the tensile tests, strength of the Y modified alloy declines with increasing the SDAS values.
19 citations
TL;DR: In this paper, a kind of compound extrusion technology including extrusion and following shears for AZ31 magnesium billets have been explored, and three-dimensional finite element simulations of extruding AZ 31 magnesium alloy billets into small rods at a certain ram speed have been performed by compound extrusions with extrusion ratio 28 and channel angle 150°.
Abstract: To research physical fields evolution and microstructures for compound extrusion of AZ31 Alloy, A kind of compound extrusion technology including extrusion and following shears for AZ31 magnesium billets have been explored. Three-dimensional finite element simulations of extruding AZ31 magnesium alloy billets into small rods at certain ram speed have been performed by compound extrusion with extrusion ratio 28 and channel angle 150°. Parameters including workpiece material characteristics and process conditions have been taken into consideration. High cumulative strains and low temperatures rise was the main reason for grain refinement during compound process. The observation results of microstructures and rod surface quality showed that the compound process effectively refine the grains of AZ31 magnesium and product magnesium alloy rods.
14 citations
TL;DR: In this article, the influence of the silicon concentration on the oxidation resistance of Mo-Si-B-N coatings prepared by magnetron sputtering is investigated, and it is established that oxidation resistance increases as the Si concentration in coatings increases, which is caused by the formation of a silicon oxide-based dense layer.
Abstract: The influence of the silicon concentration on the oxidation resistance of Mo-Si-B-N coatings prepared by magnetron sputtering is investigated. The Si content in them was controlled by the composite-target composition, as well as by various areas of silicon segments placed into the target-erosion zone. The composition and structure of coatings after deposition and annealing in air at temperatures of 500–1300°C are investigated using transmission and scanning electron microscopy, energy-dispersive analysis, and glow-discharge optical emission spectroscopy. It is established that oxidation resistance increases as the Si concentration in coatings increases, which is caused by the formation of a silicon oxide-based dense layer; this layer prevents oxygen propagation into the coating depth upon heating. The maximal oxidation resistance at a level of 1300°C is attained in Mo-Si-B-N coatings containing 40 at % Si.
14 citations
TL;DR: In this article, the physicochemical processes of the fluoride processing of kyanite concentrates under the influence of additional components are studied theoretically and experimentally in the range of temperatures of 20-550°C and curing times of 0.12-4.5 h.
Abstract: Physicochemical processes of the fluoride processing of kyanite concentrates under the influence of additional components are studied theoretically and experimentally in the range of temperatures of 20–550°C and curing times of 0.12–4.5 h. The optimal conditions of feed stock sintering with ammonium bifluoride, sublimation of ammonium hexafluorosilicate, formation of aluminum fluoride and alumina, and synthesis of amorphous silica nanoparticles are found. Thermodynamic and kinetic parameters of chemical reactions are calculated. The studies are used as a basis for the development of the fluoride method of alumina generation from kyanite concentrates with the complex recovery of other useful components.
12 citations
TL;DR: In this article, it is shown that the convective motion of the melt behind the combustion front under the effect of gravitation leads to an increase in combustion rate, completeness of the chemical interaction in the combustion wave, and composition homogenization of combustion products over the melt bulk.
Abstract: Cast nickel aluminide-based eutectic alloys of the equimolar composition NiAl-Mo (Cr, V, Nb) alloyed with boron and hafnium are fabricated by centrifugal SHS metallurgy. It is established experimentally that the acceleration range of 150–200 g is the most manufacturable. It is shown that the convective motion of the melt behind the combustion front under the effect of gravitation leads to an increase in the combustion rate, completeness of the chemical interaction in the combustion wave, and composition homogenization of combustion products over the melt bulk. It is established that alloys have the homogeneous composite structure of the NiAl grain with an insignificant amount of boride inclusions (MoB, V(Cr)B, Mo(Nb)B2), which are uniformly distributed in the matrix consisting of the β/γ eutectics. The density for all four compositions under study did not exceed 6.7 g/cm2.
12 citations
TL;DR: In this article, the effects of initial hydrogen level and cooling rate on the ultimate tensile strength of commercial Al-A319 alloys were investigated, and the relationship between UTS and microstructurai features (SDAS and fraction of porosity (Fp%) was investigated.
Abstract: The present study investigated the effects of initial Hydrogen level and cooling rate on ultimate tensile strength of commercial Al-A319 alloys. Three hydrogen levels (0.01, 0.2, and 0.41 mL/100 grams of melt) and five cooling rate were studied. Total of 45 tensile test bars was prepared (three hydrogen levels × five cooling rate × three repeats). The UTS of the samples was determined though uniaxial tension tests. Furthermore, the microstructures of the samples were studied by standard metallographic technique and image analysis software. Finally the relationship between UTS and microstructurai features—SDAS and fraction of porosity (Fp%)—of the alloys was investigated.
12 citations
TL;DR: In this article, the effect of electromagnetic action on the quality of a ferromagnetic powder obtained under hammer milling was investigated and the results of an investigation into the effect was presented.
Abstract: Findings of an investigation into the effect of electromagnetic action on the quality of a ferromagnetic powder obtained under hammer milling are given.
TL;DR: In this paper, the features of influence of ZrO2 and WC nanoparticles on the properties of the iron-based metal matrix composite are investigated, and the influence of nanoparticles in terms of the compactibility of the powder material and mechanical and tribological properties of alloy is analyzed.
Abstract: The features of influence of ZrO2 and WC nanoparticles on the properties of the iron-based metal matrix composite are investigated. The influence of nanoparticles on the compactibility of the powder material and mechanical and tribological properties of alloy is analyzed. It is revealed that the metal matrix composite particle reinforced with nanoparticles, which was fabricated by hot compression technology, is characterized by increased hardness and wear resistance.
TL;DR: In this article, the oxalic acid was employed to precipitate the ferrum, nickel cobalt and manganese from the leaching sulfate solution of ferrochrome alloy.
Abstract: The oxalic acid was employed to precipitate the ferrum, nickel cobalt and manganese from the leaching sulfate solution of ferrochrome alloy. The amount of oxalic acid, reaction temperature and terminal pH of the chromium sulfate solution were investigated. The results show that the deposition efficiency of ferrum reaches 99% and loss rate of chromium is less than 1% when 120% theoretical quantity of oxalic acid is used under 30°C and terminal pH = 3. At the same time the deposition efficiencies of nickel, cobalt and manganese in the solution are 98.4, 92.2, 97.5%, respectively. The iron content of ferrous oxalate precipitated from the chromium sulfate solution reaches 30.5% with uniform particle size distribution which can be used as the raw material of lithium iron phosphate. The new technique can solve the problem of separating the high content iron from the chromium sulfate solution, and the elements in the ferrochrome can be used comprehensively. So the new technique has a good industrial application prospect.
TL;DR: In this paper, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy and energy-dispersive spectroscopy studies were performed with molding sand and sugar industry fly ash to evaluate and compare their physical properties.
Abstract: X-ray diffraction, thermogravimetric analysis, scanning electron microscopy and energy-dispersive spectroscopy studies were performed with molding sand and sugar industry fly ash to evaluate and compare their physical properties. We noted that several physical properties of sugar industry fly ash and molding sand were similar. We then tested the permeability, green compression strength and dry compression strength of various compositions of sugar industry fly ash and bentonite to explore their potential as an alternative to molding sand, thereby reducing the dependency on the latter, as well as to suggest an effective way for disposal of fly ash from sugar industry. We also found that quality aluminium castings could be produced using fly ash, which effectively replaced 24% of molding sand in the foundry, thereby reducing the cost of production and increasing the surface finish of castings.
TL;DR: In this article, the availability of applying oxidizing-chlorinating roasting with alkali metal chlorides to process the molybdenite concentrate, which is determined by a decrease in roasting temperature to 450°C and the formation of water-soluble compounds during roasting, is shown.
Abstract: The availability of applying oxidizing-chlorinating roasting with alkali metal chlorides to process the molybdenite concentrate, which is determined by a decrease in roasting temperature to 450°C and the formation of water-soluble molybdenum compounds during roasting, is shown. It is established that ∼60–75% molybdenum remains in ash in this case, while its remaining amount is chlorinated and distilled in the composition of chlorides and oxychlorides being completely caught in the settling chamber and absorbers. The chemism of processes occurring during the oxidizing-chlorinating roasting, which makes it possible to explain a decrease in the oxidizing temperature of molybdenite from 550–600 to 450°C, is described. Optimal modes of ash leaching with water and alkali solutions are determined; based on them, a functional production flowchart which includes oxidizing-chlorinating roasting with sodium chloride, two-stage leaching (aqueous and alkaline), and the dissolution of condensed molybdenum oxides and oxychlorides, is proposed to process molybdenite concentrates. This flowchart makes it possible to process certified molybdenite concentrates with the recovery of molybdenum into solutions no lower than 98%.
TL;DR: In this article, conditions of the self-propagating high-temperature synthesis of the composition of the silicon carbide nanopowder with whisker silicon nitride crystals and flux, which can be used as a modifier of cast aluminum alloys and a reinforcing phase in dispersion-hardened alumomatrix composites, are determined.
Abstract: Combustion of the “silicon-sodium azide-ammonium hexafluorosilicate-carbon-aluminum” powder mixture in the nitrogen medium is investigated. Conditions of the self-propagating high-temperature synthesis (SHS) of the composition of the silicon carbide nanopowder with whisker silicon nitride crystals and flux, which can be used as a modifier of cast aluminum alloys and a reinforcing phase in dispersion-hardened alumomatrix composites, are determined.
Abstract: This review describes the current state and the character of changes of the gallium market under the influence of new sectors of its applications, as well as the state and prospects of the Russian market The dynamics of world production and prices for gallium in recent years are shown Changes in the commercial and industrial policy of China as the main producer of this metal are analyzed The need for gallium in medium-term and long-term prospects is evaluated
TL;DR: In this article, the self-propagating synthesis of titanium carbide particles in an aluminum melt made from a mixture of titanium and carbon powders with the addition of a chloride-containing flux, aluminum, or haloid salt (Na2TiF6) during the fabrication of the Al-10% TiC alloy is investigated.
Abstract: The self-propagating synthesis (SHS) of titanium carbide particles in an aluminum melt made from a mixture of titanium and carbon powders with the addition of a chloride-containing flux, aluminum, or haloid salt (Na2TiF6) during the fabrication of the Al-10% TiC alloy is investigated. It is shown that the use of these additives makes it possible to reduce the size of synthesized particles of the TiC carbide phase to ultradispersed (0.17–0.35 μm) and nanosize (smaller than 0.1 μm) levels.
TL;DR: In this article, the structure, composition, and properties of electrospark coatings formed on substrates of white cast iron with the use of a STIM-40NA self-propagating high-temperature synthesis (SHS) electrode material (TiC-NiAl composition) are studied.
Abstract: The structure, composition, and properties of electrospark coatings formed on substrates of white cast iron with the use of a STIM-40NA self-propagating high-temperature synthesis (SHS) electrode material (TiC-NiAl composition) are studied. The roughness of the produced coating is investigated. The application of the electrospark-alloying (ESA) process favored enhancing the mill roll durability more than twice at the Oskolsky Electrometallurgical Works.
TL;DR: In this article, the possibility of simulation the process of casting of the titanium aluminide-based TNMB1 alloy in the ProCast software is considered, and the solidification parameters found using ProCast and Thermo� Calc thermodynamic databases are compared.
Abstract: The possibility of simulation the process of casting of the titanium aluminidebased TNMB1 alloy in the ProCast software is considered. The solidification parameters found using the ProCast and Thermo� Calc thermodynamic databases are compared. It is shown that it is preferable to use alloys available in the ProCast database for simulation. For various variants of the composition of the TNMB1 alloy, we evaluated the conventional castability and showed that, in order to attain its maximal values, the alloys should be doped by the upper limit of admissible concentrations. A material for a cast mold called corundum ceramics (National University of Science and Technology "MISiS", Moscow) with properties differing from those of available in the database ProCast system for computer simulation of casting processes was proposed.
TL;DR: In this article, the influence of the initial size of WC nanoparticles and their preparation modes on the density, structural parameters, and mechanical properties of tungsten carbide is investigated.
Abstract: The high-temperature consolidation of nanopowders of pure tungsten carbide by electropulse plasma sintering (spark plasma sintering) is investigated. The influence of the initial size of WC nanoparticles and their preparation modes on the density, structural parameters, and mechanical properties of tungsten carbide are investigated. Samples of high-density nanostructured tungsten carbide with high hardness (to 31 GPa) and crack resistance (5.2 MPa m1/2) are fabricated.
TL;DR: In this paper, liquidus projections in characteristic sections of the Al-Fe-Mn-Ni-Si system in a range of up to 9% Ni, to 3% Fe, to 2% Mn, and 3% Si (wt %) are computed.
Abstract: Liquidus projections in characteristic sections of the Al-Fe-Mn-Ni-Si system in a range of up to 9% Ni, to 3% Fe, to 2% Mn, and 3% Si (wt %) are computed. The element concentrations at which the primary crystallization of the Al3Ni, Al9FeNi, Al3Fe, Al6(Fe, Mn), and Al15(Fe,Mn)3Si2 intermetallide phases are determined. A good agreement between experimental and computed data is shown. When casting into metallic molds in the region of nickalin compositions, the formation of primary crystals of two Al9FeNi and Al6(Fe, Mn) phases is most probable. The primary crystallization of Al3Ni and Al15(Fe, Mn)3Si2 is possible only upon increased concentrations of nickel and silicon, and it takes slow solidification during casting in temporary molds to form the Al3Fe phase.
TL;DR: In this paper, the phase composition, structure, and properties of the surface layer of the VT6 titanium alloy subjected to combined treatment consisting of alloying by the plasma of an electric explosion of a graphite fiber with a charge of the SiC powder and subsequent exposure by a high-intense electron beam are represented.
Abstract: The results of investigations into the phase composition, structure, and properties of the surface layer of the VT6 titanium alloy subjected to combined treatment consisting of alloying by the plasma of an electric explosion of a graphite fiber with a charge of the SiC powder and subsequent exposure by a high-intense electron beam are represented. As a result of such treatment, a multiphase surface layer with a submicron and nanosize structure forms with the microhardness manifold exceeding its value in the sample volume.
TL;DR: In this article, pattern coating and vacuum assistance at the time of filling were investigated and their characterizations in constant casting conditions have been determined and a well-known A380 Al-Si-Cu casting alloy was cast at 730°C.
Abstract: Lost foam casting (LFC) process has several advantages when compared to conventional sand casting techniques however formation of large amount of gaseous products during foam pattern removal increases porosity fraction of castings, especially for low melting point A1 and Mg alloys. In this study pattern coating and vacuum assistance at the time of filling were investigated and their characterizations in constant casting conditions have been determined. Green sand moulding technique was carried out for all moulds because it is necessary to obtain sound castings by using expandable polystyrene (EPS) foam patterns without refractory coating. Simple prismatic shaped patterns were prepared from cutting pieces from an EPS isolation board. A well-known A380 Al-Si-Cu casting alloy was cast at 730°C. As expected, pattern coating reduce the gas permeability and increase porosity however metal penetration into sand grains and surface roughening occurs without coating. Slight vacuum were applied to moulds with vacuum casting machine until solidification. Vacuum assistance enhanced gas removal and it has clear effect on decreasing porosity.
TL;DR: In this paper, the lead recovery from the mentioned slag using a hydrometallurgical process was studied using a XRD analysis, which showed that PbS is the main mineral in the slag and the difference between washed and unwashed samples is lack of Na2O in washed one so that before washing this compound existed.
Abstract: With regard to the large amount produced from this type of slag in flash lead smelting furnace of Ghaniabad plant and considerable lead content of the slag, the recovery of lead is of prime importance. This research work was under taken to study the lead recovery from the mentioned slag using a hydrometallurgical process. Solving in water is done on slag for 30 minutes. XRD analysis showed that PbS is the main mineral in the slag and the difference between washed and unwashed samples is lack of Na2O in washed one so that before washing this compound existed. The slag sample was first crushed and washed in distilled water. The residue was classified into different sizes. The slag powder was then leached in Hydrochloric acid under different conditions to evaluate the effect of such parameters as pH, temperature and slag particle size on the dissolution rate of lead. It was depicted that the most critical parameter affecting the leaching rate is pH whereby the decrease of down to negative number the leaching rate increased pH significantly. Finally kinetic study of slag leaching showed that the diffusion of in the solid particle controlled the lead leaches process. This was confirmed by calculation of activation energy where was obtained as 9.47 kJ mol−1 calculated.
TL;DR: In this article, the effect of tin, germanium, and antimony, as well as animal glue, on current efficiency and specific power consumption within the electrowinning of zinc was discussed.
Abstract: This article discusses the effect of tin, germanium, and antimony, as well as animal glue, on current efficiency η and specific power consumption (W) within the electrowinning of zinc. Adequate regression models of η and W as a function of cathode current density, concentrations of impurities, and animal glue in electrolyte at a constant temperature have been obtained. The ranks of independent variables in terms of intensity of influence on η has been determined. They are located in the cluster as follows (in decreasing order): Ge, Sn, and Sb. It has been established experimentally that antimony in the concentration range 0.001–0.150 mg/L increases the current efficiency within the electrowinning of zinc.
TL;DR: In this paper, the effects of cetyltrimethylammonium bromide (CTABr) and sodium lauryl sulfate (SLS) on the current efficiency, cell voltage, voltammetric behavior, and deposit character during production of zinc powder by alkaline electrowinning were investigated.
Abstract: The effects of cetyltrimethylammonium bromide (CTABr) and sodium lauryl sulfate (SLS) on the current efficiency, cell voltage, voltammetric behavior, and deposit character during production of zinc powder by alkaline electrowinning were investigated. Surface morphologies, crystallographic orientations, and grain size distributions of zinc powders were examined by Scanning Electron Microscopy, X-ray Diffraction, and Malvern Laser Particle Size Analyzer, respectively. Maximum current efficiencies of 97.5 and 98.3% were obtained at 1 mg/L CTABr and 10 mg/L SLS, respectively. Voltammetric studies indicated that the surfactants polarized the cathode, which was reflected in powder character. The surfactants dramatically changed the surface morphology and decreased the grain size. Zinc powders with an average grain size of 34.7 μm were obtained in the presence of 10 mg L−1 CTABr. At 0–10 mg L−1 CTABr/SLS, zinc powders exhibited an orientation dominated by (101) (002) (100). 1 mg L−1 SLS hadapositive effect on counteracting the influence of Sb.
TL;DR: In this article, the structure and properties of TiN-Cu coatings with a broad range of copper concentrations (C = 0.6-20 at %), which were fabricated by the ion-plasma vacuum-arc deposition on a TT10K8B hard-alloy tool, including its cutting resistant tests, were investigated.
Abstract: The structure and properties of TiN-Cu coatings with a broad range of copper concentrations (C
Cu = 0.6–20 at %), which were fabricated by the ion-plasma vacuum-arc deposition on a TT10K8B hard-alloy tool, including its cutting resistant tests, were investigated. The introduction of copper into the coating composition diminishes crystallites of the nitride phase from 100 to 20 nm. The hardness of coatings increases from 20 to 40 GPa, with an increase in C
Cu to 7–8%. The further increase in the copper content, which is accompanied by diminishing crystallites of the nitride phase, is characterized by a decrease in hardness to 14–15 GPa, which is associated with the influence of soft plastic metal. Resistant cutting tests of steel 35KhGSA of removable multifaceted plates (RMP) with the TiN-Cu coatings indicate that the optimally selected composition (TiN-7-8 at % Cu) increases RMP resistance more than by a factor of 6 and 2.5 as compared with tools without the coating and with the TiN coating deposited according to the basic technology, respectively.
TL;DR: In this paper, the effects of the initial temperature on basic combustion parameters have been investigated and the effect of preheating the reaction mixture enables the initiation of the combustion in the self-oscillatory mode and initial temperature dependences of combustion temperature and rate have a linear character.
Abstract: This study is devoted to the synthesis and investigation of the Mo5SiB2-based ceramic material (T2 phase). The influence of the initial temperature on basic combustion parameters is shown. It is found that preheating the reaction mixture enables the initiation of the combustion in the self-oscillatory mode and the initial temperature dependences of the combustion temperature and rate have a linear character. The effective activation energy of the SHS process is calculated. Some variants of chemical reactions between Mo, Si, and B are proposed to explain the combustion mechanism in the investigated ternary system. Compacted samples are obtained using the forced SHS compaction. The phase composition, structure, and properties of synthesized ceramic materials, in which Mo5SiB2 grains are the main component with an average size of 10–20 μm, are studied. The lines of Mo3Si and Mo intermediate phases, the total fraction of which does not exceed 4%, are identified as well. The produced T2 phase-based material has a high specific density and hardness.
TL;DR: In this article, a model of the structure and procedure of calculating (predicting) the thermal conductivity of composites of the group of "eutectic models" is proposed.
Abstract: The physical nature of the experimentally found anomalous type of the concentration dependence of thermal conductivity of binary ceramic composites is interpreted. A model of the structure and procedure of calculating (predicting) the thermal conductivity of composites of the group of “eutectic models” is proposed.