Synthesis, Sintering, Microstructure, and Mechanical Properties of Ceramics Made by Exothermic Reactions
作者:
Raymond A. Cutler,
Kevin M. Rigtrup,
Anil V. Virkar,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 1
页码: 36-43
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb05438.x
出版商: Blackwell Publishing Ltd
关键词: ceramics;composites;sintering;self‐propagating high‐temperature synthesis;microstructure
数据来源: WILEY
摘要:
Al2O3‐TiC, Al2O3‐TiC0.5N0.5, Al2O3‐WC, Al2O3‐SiC, and Al2O3‐HfB2powders were synthesized by the aluminothermic reduction of oxides in the presence of carbon or boron. The reacted powders were milled to reduce the size of agglomerates and subsequently densified without applied pressure to near‐theoretical density. Microstructures and mechanical properties of composites made from exothermically reacted powders were compared with similar ceramics made from commercially available powders. In situ sintering was possible in the Al2O3‐TiC system using a closed graphite crucible to contain reaction gases. The synthesis ofβ‐SiC at temperatures above 1400°C via the direct reaction of the elements (SHS) was compared with SiC made by the magnesiothermic reduction of SiO2in the presence of C after removing th
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