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COMPOZITES AND MULTIPURPOZE COATINGS
ArticleName Diffusion-hardening alloys: synthesis, properties and application
ArticleAuthor Yatsenko S. P., Skachkov V. M., Krasnenko T. I., Pasechnik L. A.
ArticleAuthorData

Institute of Solid State Chemistry of Ural Branch of Russian Academy of Sciences, Ekaterinburg, Russia:

S. P. Yatsenko, Head of Laboratory, e-mail: yatsenko@ihim.uran.ru
V. M. Skachkov, Engineer
T. I. Krasnenko, Leading Researcher
L. A. Pasechnik, Senior Researcher

Abstract

This paper describes the report of methods of mechanical and mechanically activated mastication of metal powders and inert filling agents into liquid fusible alloys. This process provides multilevel hardening of the matrix with various phases during subsequent dispersion hardening of the composite in the course of thermal treatment. Compositions of these paste-like mixtures are non-equilibrium, therefore forming of intermetallic compounds and solid solutions with high melting temperatures occurs as a result of chemical interaction between the mixture components. Conditions for fabrication of electrochemical coatings are described, using these pastes and providing permanent connection of heterogeneous materials (including glass, ceramic, silicon etc.). Compositions of water-salt solutions for coating metallic surfaces with gallium and copper were determined together with development of conditions of electrochemical process for fabrication of intermediate insulating layers for permanent connection of materials. There are given the solutions for varying of thermal expansion coefficients of the composite alloys from usual to zero values via heterodesmic compounds (divanadates) as filling agents. The limiting values of shearing and cleavage strength and wear resistance for obtained samples of compounds are presented. The air tightness of material connecting seams and the possible temperature range of application of these compositions are discussed. It was experimentally shown that developed compositional diffusion hardening alloys hold much promise in different spheres.

keywords Gallium, copper, copper divanadate, solder, thermal expansion, flux-free soldering, electrochemical application
References

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2. Yatsenko S. P., Sabirzyanov A. N. Vestnik Kurganskogo gosuniversiteta. Seriya Tekhnicheskie nauki — Bulletin of Kurgan State University. Series “Engineering Sciences”. 2006. Iss. 2, Part. 1. pp. 173–174.
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14. Yatsenko S. P., Smirnov B. N., Sabirzyanov N. A. et al. Zhidkometallicheskiy kontakt dlya tokosema (Liquid-metal contact for current collection). Patent RF, No. 2030045. Applied: April 22, 1991. Published: February 27, 1995. Bulletin No. 15.

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