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Study on the Heat–Treatment Reinforcement of Aluminum Nitride–Silicon Carbide Composites

Published online by Cambridge University Press:  22 February 2011

Li Ningfang ,
Zhang Hongquan  and
Wang Guomei
Li Ningfang
Affiliation:
Department of Material Engineering, Wuhan University of Technology, Wuhan 430070, China
Zhang Hongquan
Affiliation:
Department of Material Engineering, Wuhan University of Technology, Wuhan 430070, China
Wang Guomei
Affiliation:
Department of Material Engineering, Wuhan University of Technology, Wuhan 430070, China
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Abstract

The effects of heat – treatment on the mechanical properties of AIN – SiC whisker composites with Y2O3 and SiO2 additives has been studied. When the sample containing 10 wt% Y2O3 +SiO2 (Y2O3/SiO2= 1/0. 66) was treated at 1300°C in air for 140 hours the strength of compositqs was raised from 481 MPa to 784 MPa.

The phase composition, microstructure and grain boundary phase structure have been characterized by combining XRD, SEM, TEM/EDXA and HREM techniques. The reinforcement mechanism of the composites results from crystallization of the glass phase in the grain boundary at the high temperature oxidizing atmosphere to form the crossing structure of 2Hδ Sialon fibrous phase and SiC whisker.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 327: Symposium N – Covalent Ceramics II: Non-Oxides , 1993 , 349
Copyright
Copyright © Materials Research Society 1994

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