摘要
研究了高Ｌａ２Ｏ３Ｙ２Ｏ３含量自增韧Ｓｉ３Ｎ４在热压预烧结及高温气压处理过程中的相转变和晶体生长。采用热压烧结方法制备了几种具有较高相对密度，不同α相含量的Ｓｉ３Ｎ４预烧体，并在１９００℃、０９ＭＰａＮ２压力中进行气压处理。结果表明，预烧体中α相量越高，预烧体及高温处理后烧结体的显微结构就越细，预烧体的晶粒尺寸分布就越窄；经高温气压处理后，提高了材料的组织均匀性。
オhe phase transition grain growth of Si3N4 with high content La2O3 and Y2O3 additives were studied. Several Si3N4 presintering bodies with different α phase content were prepared using hotpressing sintering and then were gaspressure annealed for 2 h at 1900 ℃. The microstructure of presintered body and annealed body became finer with the increase of α content in presintered body. With the decrease of α content, the grain size distribution in presintered body was wider. After annealed, the microstructure of materials became more homogeneous.
出处
《中国稀土学报》
CAS
CSCD
北大核心
1997年第4期371-374,共4页
Journal of the Chinese Society of Rare Earths
关键词
氧化镧
氧化钇
自增韧
晶体生长
氮化硅陶瓷
Rare earths, Y2O3, La2O3, Selfreinforcement, Si3N4, Grain growth
