无机材料学报

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复合稀土掺杂α-Sialon的氧化行为

张军红; 王佩玲; 张炯; 贾迎新   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室, 上海 200050
  • 收稿日期:1998-10-16 修回日期:1998-12-01 出版日期:1999-10-20 网络出版日期:1999-10-20

Oxidation Behavior of Multi-Canon a-Sialons Containing Rare Earth

ZHANG Jun-Hong; WANG Pei-Ling; ZHANG Jiong; JIA Ying-Xin   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute ofCeramics Shanghai 200050 China
  • Received:1998-10-16 Revised:1998-12-01 Published:1999-10-20 Online:1999-10-20

摘要: 对组份为(Nd0.180.18)Si10.38Al1.620.54N15.46和(Nd0.18Yb0.18)Si10.38Al1.620.54N15.46的复合稀土掺杂α-Sialon材料在1200~1400℃温度范围内的氧化行为进行了研究.样品由热压工艺制备.研究结果表明,在1200和1300℃氧化20h的材料表面存在择优取向的含Nd和Y(或Yb)-硅酸盐晶粒.随氧化温度的提高,氧化表面由相对致密的硅酸盐氧化层软化形成气泡直至出现明显的透明玻璃相.文中还对氧化过程中表面形成的物相进行了讨论.

关键词: Sialon, 稀土, 氧化行为

Abstract: he oxidation behavior of multi-cation α-Sialons containing Nd and Y or Yb for the compositions (Nd0.18Y0.18)Si10.38Al1.62O0.54N15.46
and (Nd0.18Yb0.18)Si10.38Al1.62O0.54N15.46 was investigated in the temperature range of 1200℃ to 1400℃ in air.
The samples were prepared by hot-pressing technique. The results indicated that there existed silicate grains containing neodymium and yttrium or ytterbium in
preferred orientation on the surface of multi-cation (Nd,Y)- and (Nd,Yb)-α-Sialon respectively oxidized at 1200℃ or 1300℃ for 20h. By increase
of oxidation temperature, bubble, which was caused by softening of silicate oxidation layer, occurred and glassy phase appeared obviously on the surfaces of oxidized samples.
The phases formed on the surfaces of multi-cation α-Sialons during the oxidation were also discussed in this paper.

Key words: Sialon, Rare earth, Oxidation behavior

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