Chemical, Phase, and Structural Transformations in the Combustion of Mixtures with Tungsten Oxide with Aluminum
In this paper, we studied the regularities of the synthesis of cast carbide-tungsten materials in the combustion of a WO3/Al/Sa/C mixture. The combustion products of the mixture were shown to be cast tungsten carbides with an admixture of Al and an oxide solution of Al2O3-CaO, formed as two layers. A partial replacement of aluminum by calcium in the initial mixture was found to reduce the impurity content of aluminum in W-C. Cast carbide carbide-tungsten materials contain up to 2 wt % C. Their chemical and phase composition and microstructure are determined.
Keywordscomplex reductant synthesis combustion mode phase separation relative scatter and yield cast carbide-tungsten materials
Unable to display preview. Download preview PDF.
- 1.R. Kieffer and P. Schwarzkopf, Refractory Hard Metals (Macmillan, New York, 1953; Metallurgizdat, Moscow, 1957).Google Scholar
- 3.E. Storms, The Refractory Carbides (Academic, New York, 1967; Mir, Moscow, 1970).Google Scholar
- 4.G. V. Samsonov, V. K. Vitryanyuk, and F. I. Chaplygin, The Carbides of Tungsten (Nauk. Dumka, Kiev, 1974) [in Russian].Google Scholar
- 6.State Diagrams of Refractory Oxide Systems, The Handbook, Vol. 5: Binary Systems (Nauka, Leningrad, 1985), Part 1, p. 125 [in Russian].Google Scholar
- 7.E. A. Levashov, A. S. Rogachev, V. V. Kurbatkina, Yu. M. Maksimov, and V. I. Yukhvid, Perspective Materials and Technologies of Self-Propagating High-Temperature Synthesis (MISiS, Moscow, 2011) [in Russian].Google Scholar