Papers by Author: Vladimir A. Popov

Abstract: An efficient method is developed to achieve improved dispersion of detonation nanodiamond particles in amorphous thermoplastic matrices. For an estimation of the nanodiamond distribution in slices, a method of optical and transmission electron microscopy is used. The complex set of mechanical properties of polymer-nanodiamond composites is considered: tensile properties, Izod impact strength and Brinell hardness. It is found that the reinforcing and toughening effects of uniformly-dispersed nanoparticles on polymer matrices is pronounced at lower loading compared with traditional mixing procedure.

Abstract: Copper matrix nanocomposites (materials for coatings) and reinforcements from nanodiamonds, nanosilica or diatomite were fabricated by mechanical alloying, and coatings were produced by the friction cladding method. Investigations included the study of material at all steps of the technological scheme: formation of granules during mechanical alloying; distribution of nanoparticles in the copper matrix after consolidation of granules; structure of coatings and distribution of reinforcements in the coatings. As the result of these investigations, optimal technological conditions of treatment were developed.

Abstract: The main results of the investigation of boron-containing compounds that are planed to use as light components for creation of metal-matrix composites (MMC) are presented in the paper. A number of new general procedures have been developed, physical-chemical properties of boron cluster anions BnHn 2- (n = 10, 12) were investigated. Method of MMC fabrication is based on mechanical alloying and following compaction.

Abstract: Blank punch was applied for manufacturing of hollow billets by press piercing. Analysis of piercing by different punches was carried out. Data showing fluctuating of load during piercing and changing of billet’s shape was received.

Abstract: A process of friction plating was developed for modification of the surface of metal items by strain hardening combined with application of protective coatings aimed to improve corrosion resistance, hardness, wear resistance and other functional properties. Friction plating is performed by means of a metal wire brush rotating at high speed. Coating material in the form of a rod or strip is pressed with a certain force to the rotary wire brush. In the contact zone, coating material is heated up to a high temperature. Particles of coating material are picked up by the ends of brush wires and transferred onto the treated surface. At the same time, the surface of the product is conditioned and heated. Investigations of friction plating have shown that plastic deformation of the surface layer combined with application of coating material particles ensures their strong adhesion to the substrate.

Abstract: In recent years, industries have increasingly demanded novel materials of low density (and, therefore, weight) and high strength. Such materials are required for all kinds of transport, especially for automobile and aviation industries. Lower weight vehicles would allow for reduced fuel consumption, which increases the transportation efficiency (the economical point of view) and a corresponding decrease of emission of pollutants to the atmosphere (the ecological point of view). This is why the development of materials with decreased densities is of great importance. The aim of this study was to develop novel materials as reinforcing elements for metal matrix composites. Boron crystalline compounds are proposed to be used, including the derivatives of higher boron– hydrogen anions BnXn 2- n = 10,12, X = H (in some cases – halogen, for example, Cl) as their respective densities meet the criteria. The study pursued two goals: (i) to develop a method for producing these boron hydrides and (ii) to investigate the structure and properties of these boron hydrides.