无机材料学报

• 研究论文 • 上一篇    下一篇

不同工艺条件下Ca-α-Sialon显微结构的形成与发展

李雅文1; 王佩玲1; 严东生1; 程一兵2   

  1. 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; 2. 澳大利亚Monash大学材料工程系
  • 收稿日期:1998-11-20 修回日期:1998-12-14 出版日期:1999-12-20 网络出版日期:1999-12-20

Microstructural Development of Ca-α-Sialon under Different Processing Conditions

LI Ya-Wen1; WANG Pei-Ling1; YAN Dong-Sheng1; CHENG Yi-Bing 2   

  1. 1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; CAS; Shanghai 200050; China; 2. Department of Materials Engineering; Monash University; Clayton, Victoria, 3168, Australia
  • Received:1998-11-20 Revised:1998-12-14 Published:1999-12-20 Online:1999-12-20

摘要: 对高x值Ca-α-Sialon系统(Ca1.8Si6.6Al5.4O1.8N14.2)用无压烧结的方法得到了具有长颗粒形貌的α-Sialon陶瓷.通过SEM观察研究了升温速度和中间保温等工艺因素对材料显微结构的影响规律,并结合反应过程的研究探讨了在Ca-α-Sialon中长颗粒α-Sialon晶粒的成核与生长机理.结果表明,α-Sialon形成过程中较少的晶核数目及较多的液相量容易得到长颗粒的α-Sialon晶粒,并且中间相的形成与溶解会直接影响晶核数目与液相量.

关键词: Ca, α-Sialon, 长颗粒, 显微结构

Abstract: Elongated α-Sialon grains were produced in pressureless sintered Ca-α-Sialon ceramics with the composition Ca1.8Si6.6Al5.4O1.8N14.2.
The effect of the processing conditions, such as heating rate and middle dwelling, on the microstructure of the material was studied by SEM, along
with the discussion on the nucleation and growth mechanism of the elongated α-Sialon grains. It was found that elongated α-Sialon grains
are easier to develop with fewer nuclei and abundant liquid phase during sintering, while the formation and redissolution of the middle phase
(gehlenite) is directly related to nuclei number and quantity of the liquid phase.

Key words: Ca, elongated α-Sialon grains, microstructure

中图分类号: