On the extension of the alpha-SiAlON solid solution range and anisotropic grain growth in Sm-doped alpha-SiAlON ceramics

被引:43
作者
Nordberg, LO
Shen, ZJ
Nygren, M
Ekstrom, T
机构
[1] UNIV STOCKHOLM, ARRHENIUS LAB, DEPT ORGAN CHEM, S-10691 STOCKHOLM, SWEDEN
[2] ZHEJIANG UNIV, DEPT MAT SCI & ENGN, HANGZHOU 310027, PEOPLES R CHINA
关键词
D O I
10.1016/S0955-2219(96)00093-3
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
alpha-SiAlON samples of the overall composition SmxSi12-(m+n)Alm+nOnN16-m with m and n in the ranges 0.6 less than or equal to m less than or equal to 1.44 and 1.3 less than or equal to n less than or equal to 1.7 (m = 3x), were prepared by a hot-pressing technique at 1800 and 1700 degrees C. Based on X-ray powder diffraction studies and elemental analysis of individual alpha-SiAlON grains in the obtained ceramic compacts, the extension of the Sm-doped alpha-SiAlON solid solution range was mapped out. The m-value was found to vary between 0.89 and 1.52 while n was always less than 1.23. Elongated alpha-SiAlON grains were found preferentially in compacts having overall compositions located slightly outside the oxygen-rich border-line of the homogeneity region of the Sm-doped alpha-SiAlON phase, ie. for m approximate to 1.2 and n approximate to 1.3. We also noticed that elongated alpha-SiAlON grains were formed prefererentially perpendicular to the pressure applied in the sintering procedure. All samples exhibited HV10-values in the range 21-22 GPa and K-1c-values in the range 4.0-4.7 MPa m(1/2). (C) 1997. Published by Elsevier Science Limited. All rights reserved.
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页码:575 / 580
页数:6
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