Particle/Matrix Interface and Its Role in Creep Inhibition in Alumina/Silicon Carbide Nanocomposites
作者:
Tatsuki Ohji,
Takeshi Hirano,
Atsushi Nakahira,
Koichi Niihara,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1996)
卷期:
Volume 79,
issue 1
页码: 33-45
ISSN:0002-7820
年代: 1996
DOI:10.1111/j.1151-2916.1996.tb07877.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
This study focuses on interfacial bonding between intergranular silicon carbide particles and an alumina matrix, to determine the creep inhibition mechanism of alumina/ silicon carbide nanocomposites. It is revealed that the silicon carbide/alumina interface possesses much stronger bonding than the alumina/alumina interface through three approaches: investigation of fracture toughness and fracture mode and consideration of internal thermal stresses acting at grain boundaries, estimation of equilibrium thickness of intergranular glassy films by force balance, and direct observation of grain boundaries by TEM. The rigid bonding of alumina/silicon carbide interfaces causes inhibition of vacancy nucleation and annihilation at the interfaces, causing remarkably improved creep resistance of the nanocomposite.
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