Title: Combustion synthesis of Ti-B-Al system

Authors: Osamu Odawara, Yuichi Momoi

Addresses: Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 227, Japan. ' Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 227, Japan

Abstract: Finely dispersed TiB₂ is synthesised by reacting a powder mixture of Ti, B and Al in the molar ratio of 1:4:1 and the grain size of the synthesized TiB, is < 0.5µm. which is much smaller than that obtained from the reaction of a powder mixture of Ti, B and Al in the molar ratio 1:(n+2):0 or 1:Z:n (n = 0, 1.2 or 3). It is estimated that, in the case of the Ti+4B+Al, the reaction of Al-B system following TiB₂ combustion synthesis would generate the excess heat behind the combustion front, resulting in long keeping time at high temperatures. The net effect is that the nucleation of TiB₂ increases much more than that in other situations studied.

Keywords: additives; aluminium borides; ceramics; composites; processing; combustion synthesis; titanium diboride; nucleation.

DOI: 10.1504/IJMPT.1995.036471

International Journal of Materials and Product Technology, 1995 Vol.10 No.3/4/5/6, pp.489 - 492

Published online: 03 Nov 2010 *

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