Pressureless sintering of La-Y-Sialon ceramics and grain growth in later period of sintering
来源期刊：中国有色金属学报(英文版)2001年第4期
论文作者：王零森 张正富 樊毅 尹邦跃
文章页码：559 - 562
Key words：Sialon; grain growth; pressureless sintering
Abstract: The pressureless sintering process of Sialon ceramics added (1.5% La2O3+4.5%Y2O3) as sintering aids was studied. It is found that a β′-Sialon with relative density over 99%is obtained by sintering at 1750℃ for 1h. Crystal grain growth was observed at room temperature by SEM for the samples sintered at 1800℃ holding for different time. It is proved that grain growth along c-axis of β′-phase is a first priority, since (210) and (001) lattice plans have different activation energy. On the present conditions, logarithm of grain aspect ratio L/W of average grain length L to average width W is in proportion to sintering time because of proportion of lgL to sintering time and proportion of W to sintering time.
