无机材料学报 ›› 2016, Vol. 31 ›› Issue (4): 443-448.DOI: 10.15541/jim20150461 CSTR: 32189.14.10.15541/jim20150461

• • 上一篇    

液相烧结碳化硅陶瓷的原位研究

梁汉琴, 姚秀敏, 黄政仁, 曾宇平   

  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:2015-09-23 出版日期:2016-04-20 网络出版日期:2016-03-25
  • 作者简介:梁汉琴. E-mail: hqliang@mail.sic.ac.cn

In Situ Analysis of the Liquid Phase Sintering Process of α-SiC Ceramics

LIANG Han-Qin, YAO Xiu-Min, HUANG Zheng-Ren, ZENG Yu-Ping   

  1. (The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)
  • Received:2015-09-23 Published:2016-04-20 Online:2016-03-25
  • About author:LIANG Han-Qin(1987–), male, research assistant. E-mail: hqliang@mail.sic.ac.cn

摘要:

采用原位分析设备与传统方法相结合的方式研究了以Al2O3和Y2O3为烧结助剂的SiC陶瓷的液相烧结过程。通过高温实时观测炉对样品在测试过程中的收缩曲线以及形貌变化进行了表征, 以及对液相形成过程的模拟进行了观测。采用传统分析方法研究了样品的相对密度、抗弯强度、物相组成以及微结构演变从1640℃到1920℃以40℃为间隔的变化情况。研究发现, 液相明显开始起作用的温度在1640℃到1680℃之间。经典的液相烧结三阶段理论可以通过微结构以及相对密度等的分析来得到验证。该烧结体系的最佳烧结温度确认为1880℃, 最高密度为(99.46±0.37)%, 最大强度为(650±26) MPa。

关键词: 碳化硅, 液相烧结, 原位研究, 微结构

Abstract:

The densification process of liquid phase sintered SiC ceramics with Al2O3 and Y2O3 as sintering additives was investigated by in situ measurement apparatus combined with conventional methods. The shrinkage curve, morphology of the sample and liquid phase formation process simulation were observed by high temperature in-situ observation furnace. The relative density, flexural strength and microstructure evolution were characterized by analysis of samples sintered at temperatures ranging from 1640℃ to 1920℃ at 40℃ interval. The obvious temperature that liquid phase began to function was confirmed between 1640℃ to 1680℃. The classical liquid phase sintering theory was testified. Highly-densified SiC ceramics were obtained by being sintered at 1880℃, of which the relative density was (99.46 ± 0.37)%, and the flexural strength was (650 ± 26) MPa.

Key words: SiC, liquid phase sintering, in-situ measurement, microstructure

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