摘要
根据Y-Si-Al-O-N相图及α-sialon分子式(Ym/3Si12-(m+n)Alm+nOnN16-n)设计Y-α-sialon陶瓷的组成,研究了m和n值对该热压烧结陶瓷物相组成、微观结构和致密度的影响规律。结果表明:当m=1.0时,设计组成中较高的n值易促进柱状晶的形成和生长,且柱状晶数量和长径比随n值增大而增大,sialon陶瓷的致密度随n值增大而减小;当n=0.8时,sialon陶瓷的晶粒形貌以等轴晶为主,致密度随m值增大而增大;较小的n值和较大的m值有利于制备结构致密、等轴状Y-α-sialon陶瓷。
Y-α-sialon compositions were designed according to the Y-Si-Al-O-N phase diagram and Ym/3Si12-（m＋n）Alm＋nOnN16-n, and the effects of the m and n values on the phase composition, microstructure and relative density of the hot-press sintered ceramics were investigated. The results reveal that when m=1.0, higher n values contribute to elongated grain growth, and both the amount and the aspect ratio of the elongated grains increase with the increase of the n value; however, the relative density decreases with the increase of the n value. When n=0.8, equiaxed α-sialon grains and small aspect ratio elongated grains form more easily, and the relative density increases with the increase of the m value; lower n and higher m values are beneficial to the densification of the ceramics as well as the formation of equiaxed Y-α-sialon grains.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2008年第11期1625-1628,共4页
Journal of The Chinese Ceramic Society
基金
高等学校博士点基金新教师(20070151024)资助项目
