Powder production processes and properties
Bardakhanov S.P., Kravets S.A., Lysenko V.I., Naumenkov V.A., Nomoev A.V., Obanin V.V., Trufanov D.Yu., Shibaev A.A.
Experimental determination of dependence of amylum friability on concentration Tarkosil silica nano-powder in it
A study of dependence of amylum friability on concentration Tarkosil silica nanosized powder in it has been performed by measurement of natural slope and amylum and nanopowder mixture flow rate through standardized funnels of different diameters. It is found that addition of small quantities of Tarkosil essentially affect the natural slope and improve amylum friability.
Key words: nanopowder, silica, natural slope, friability.
Onishchenko D.V., Popovich A.A.
Anode material production from plant raw materials for rechargeable lithium-ion (polymeric) storage batteries
New carbon materials (anodic matrices) have been produced from renewable vegetable materials (sprouts of bamboo and cane sugar) with the use of an experimentally designed thermal plant that permit accelerating raw material destruction. The carbon materials were modified with a complex of inorganic substances. Based on the anode matrices, a lot of lithium-ion (polymeric) storage batteries have been manufactured and tested.
Key words: carbon modifications, anodic matrices, vegetable (renewable) materials, lithium-ion storage batteries.
Kontsevoi Yu.V., Pastukhov E.A., Ignatiev I.E., Bulanov V.Ya., Ignatieva E.V.
Vibroaeratic mixing of powders in gas medium
Report 1. Development of method and theoretical bases of vibroaeratic mixing of powders and breakdown of conglomerates
Based on the known theory of the processes, which occur with dry powders during vibrating boiling, a new powder mixing method, named as a vibroaeration one, and a device have been developed. The following problems are formulated and solved: 1) qualitative mixing of powders of different granulometric composition, including fine-grained powders, at the complete destruction of conglomerative formations; 2) development of theoretical process bases proceeding in dry powder mass under the pressure of compressed gas “cushion”. Experimental testing of different technical solutions is presented, on the basis of which the optimal version of the mixing machine construction is chosen.
Key words: dry powder mass, fine-grained powder, conglomerates, dispersoids, vibrotreatment, vibroaeration mixing, air flow, mixer.
Kostikov V.I., Dorofeyev Yu.G., Yeremeyeva Zh.V., Zherditskaya N.N., Ulianovsky A.P., Sharipzyanova G.Kh.
Features of application of unconventional carbon-containing components in powder steel technology
Report 3. The effect of processing factors on structure formation and properties of hot-deformed powder steels
It is found that the structure formation of hot-deformed powder carbon steels with carbon-containing additives takes place as a result of the complex effect of different factors attributed to the composition of charge material, parameters of its preparation, conditions of formation and stock material sintering as well as the characteristics of iron powder on the structure, mechanical, and tribological behavior.
Key words: static cold compaction, hot forming, hot-deformed powder material, carbon-containing components, high-temperature pitch, artificial special low-ash graphite, pencil lead, tribological behavior, wear resistance, friction coefficient.
Vernigorov Yu.M., Yegorova S.I., Yegorov I.N., Plotnikov D.M.
Magnetovibrating technology utilization in separation of grinding slurry
A method of magnetovibrating separation of metal-containing slurries based on action of mutually perpendicular constant and variable gradient magnetic fields on disperse medium has been proposed. The maximal efficiency of nonmagnetic component separation is achieved at certain regimes of magnetic action. The regimes correspond to creation of magnetovibrating powder layer leading to maximal destruction of powder aggregates in the first separation stage and resonance oscillations of formed magnetic strings in the second stage.
Key words: slurry, separation, magnetic materials, magnetovibrating technology.
Theory and processes of powder material forming and sintering
Basov V.V.
Development of repeated heat treatment (re-sintering) of UO2 fuel pellets
The basic parameters of testing fuel pellets produced by powder metallurgy for re-sintering, which are ensured by repeated heat treatment, are presented. The expressions for calculation of pellet re-sintering level are given and the description of the procedure developed by OAO “Machine building works” (Elektrostal city, Moscow Region) for estimation of re-sintering different types of fuel pellets is described.
Key words: powder metallurgy, fuel pellets, fuel behavior forecasting, out-of-pile and in-pile tests, re-sintering, re-sinterability, density, microstructure, procedure of re-sintering estimation, temperature-time diagram.
High-melting-point, ceramic, and composite materials
Svistun L.I., Dmitrenko D.V., Plomodialo R.L., Serdyuk G.G.
Structure and properties of hot-formed “high-speed steel – titanium carbide” composite
The structure of powdered composite (carbide-steel), based on high-speed steel containing dispersed titanium carbide inclusions and produced by hot forming of powdered blanks, has been studied. Elemental and chemical compositions of the material were determined. A comparison of physical-chemical properties of carbide-steels – hot-formed ones and those produced by other techniques – has been carried out.
Key words: powder metallurgy, carbide-steel, structure, hot forming, chemical composition, wear strength.
Porous materials and biomaterials
Lopatin V.Yu., Levchenko V.S., Yermilov A.G., Bogatyryova E.V., Mailyants I.A.
Production of porous materials from organometallic mixtures. Report 1
A possibility has been analyzed of highly-porous material development from refractory metals (Mo, Mo–Ni, Ti–Mo) in combining the practices of powder metallurgy with chemical-metallurgical processes. The formation of metal nano-structures was found on the surface of powder particles directly in the sintering process. The nano-structures are capable of activating the Mo, Mo–Ni (50/50), Ti–Mo (85/15) based composition sintering process and enable to produce highly-porous (70–80 %) materials at temperature of 1000 °С.
Key words: porous materials, organometallic materials, compaction, sintering, nucleation centers, thermal destruction, binders, cold binders.
Nano-structured materials and functional coatings
Antonova N.M.
Mechanical properties of composite coating with polymeric matrix based on sodium-carboxymethylcellulose and Al powder
The effect of sodium-carboxymethylcellulose, glycerin, Al powder and its particle size on the mechanical strength and relative strain of the composite coatings made of these components at different temperature conditions was investigated. Regression models were proposed, which describe the interaction of mechanical properties of the composite coating with its composition, permitting to forecast the final characteristics and the quality of the coating to be applied. The interaction between the microstructure of composite coating with Al powder added and its mechanical properties is shown.
Key words: composite coating, substrate, mechanical strength, filling mass, sodium-carboxymethylcellulose, aluminum powder.
Application of powder materials and functional coatings
Anikin V.N., Blinkov I.V., Volkhonsky A.O., Sobolev N.A., Kratokhvil R.V., Frolov A.E., Tsaryova S.G.
Ion-plasma Ti–Al–N coatings on cutting carbide tool operating at the conditions of constant and oscillating loads
The processes of structure and phase formation have been investigated in Ti–Al–N (Al ≤ 3.5 at. %) coatings deposited by ion-arc method. Bias potential (Ub) applied to VK6 hard alloy substrate was a controlled parameter. Titanium nitride of the composition close to the stoichiometric one and solid solution of Al in α-Ti are formed in the coating at Ub = 120 V (first group of samples); and non-stoichiometric titanium nitride and (Ti,Al)N complex nitride are formed at Ub = 170 V (second group of samples). Hardness and elastic modulus are 23.8 GPa and 462 GPa for the 1st group of samples and 30.8 GPa and 565 GPa for the 2nd group of samples respectively. The latter values are characterized by the adhesive strength of 53–55 N against 39–40 N for coatings obtained at Ub = 120 V. Certification tests have been carried out for durability of cutting tools with designed coatings. For example, it increases 6.3 times in operations of Steel 45 grade lathe turning and 5 times in gray cast iron turning, and 2.5 times in EI 698-VD alloy face milling.
Key words: ion-plasma deposition, coatings for milling tools, coatings for turning tools, structure and phase formation in the Ti–Al–N system, adhesion to substrate, coating hardness, durability of coatings.
Chronicle
Koftelev V.T.
Stages of powder metallurgy at OAO “AVTOVAZ”
