A STUDY OF THE COMBUSTION SYNTHESIS OF MOSI2 AND MOSI2-MATRIX COMPOSITES

Citation
A. Chrysanthou et al., A STUDY OF THE COMBUSTION SYNTHESIS OF MOSI2 AND MOSI2-MATRIX COMPOSITES, Journal of Materials Science, 31(16), 1996, pp. 4221-4226
Citations number
21
Categorie Soggetti
Material Science
ISSN journal
00222461
Volume
31
Issue
16
Year of publication
1996
Pages
4221 - 4226
Database
ISI
SICI code
0022-2461(1996)31:16<4221:ASOTCS>2.0.ZU;2-R
Abstract
The combustion synthesis of MoSi2 from elemental powders was investiga ted. Higher completion of the reaction was achieved by the use of prio r compaction of powders and higher heating rates. The reaction mechani sm was studied by performing experiments at a heating rate of 20 K/min . It was established that reaction occurred via capillary motion accom panying the flow of molten silicon to the molybdenum powder particles. During the synthesis of MoSi2/TiC composites, two ternary (Mo,Ti) Si- 2 phases were observed, in contradiction to the thermodynamic predicti ons of the Mo-Si-Ti-C system. Combustion synthesis of (Mo, W) Si-2 yie lded an inhomogeneous product where the composition of the solid solut ion varied throughout the sample. These observations were discussed in terms of the characteristics of the reaction process.