MoSi sub 2 /Al sub 2 O sub 3 composites processed by S.H.S.: preparation conditions and microstructure

MoSi sub 2 /Al sub 2 O sub 3 basd composites have been obtained from SHS reactions between aluminum, molybdenum trioxide, and silicon or silica. The very fast reaction begins just after the melting of Al. The released heat raises the reaction products to a maximum temperature, T(ad), high enough to...

Full description

Saved in:
Bibliographic Details
Published in:Key engineering materials 1997-06, Vol.132-136 (3), p.2080-2083
Main Authors: Bonnet, J-P, Dumont, A-L, Smith, D S, Gault, C
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:MoSi sub 2 /Al sub 2 O sub 3 basd composites have been obtained from SHS reactions between aluminum, molybdenum trioxide, and silicon or silica. The very fast reaction begins just after the melting of Al. The released heat raises the reaction products to a maximum temperature, T(ad), high enough to allow their partial or total melting. The control of T(ad) is achieved by addition of MoSi sub 2 or Al sub 2 O sub 3 B to the starting powders. The microstructure of the final products corresponds to silicide domains dispersed in an alumina based matrix. The silicide domains are made of MoSi sub 2 or Mo(Si,Al) sub 2 grains surrounded by a Mo sub 5 Si sub 3 phase. The matrix is made of alumina grains with amorphous and/or mullite intergranular phases. The value of T(ad) influences the nature and the distribution of phases inside the final product.
ISSN:1013-9826