无机材料学报

• 研究论文 •    下一篇

陶瓷材料超塑性研究进展

张凯锋; 陈国清; 王国锋   

  1. 哈尔滨工业大学材料科学与工程学院 哈尔滨 150001
  • 收稿日期:2002-06-10 修回日期:2002-09-12 出版日期:2003-07-20 网络出版日期:2003-07-20

Superplasticity in Ceramics

ZHANG Kai-Feng; CHEN Guo-Qing; WANG Guo-Feng   

  1. School of Materials Science and Engineering; Harbin Institute of Technology; Harbin 150001; China
  • Received:2002-06-10 Revised:2002-09-12 Published:2003-07-20 Online:2003-07-20

摘要: 超塑性是细晶陶瓷在高温下的固有属性。本文综述了陶瓷材料超塑性的一般特征和氧化钇稳定四方相氧化锆多晶陶瓷(Y-TZP)的形变机理及最新研究进展。解释了不同纯度Y-TZP陶瓷在Ⅰ区存在巨大差异的原因以及杂质特征对应力指数的影响。从能量的观点进一步分析了陶瓷材料超塑变形过程中的控速机制。对共价键陶瓷Si3N4、SiC的超塑性特征以及晶间玻璃相在超塑变形中的作用进行了概括。此外,还总结了其它陶瓷材料,包括Al2O3及其复合陶瓷、纳米陶瓷的研究进展及发展方向。

关键词: 陶瓷, 超塑性, 形变机理, 玻璃相

Abstract: It is clearly demonstrated that the superplasticity is one of the common properties of fine-grained ceramics at elevated temperatures. The paper reviewed
the major features of superplasticity in ceramics, the deformation characteristics and mechanism of yttria-stabilized tetragonal zirconia polycrystals(Y-TZP), a
typical superplastic ceramic. The reason for the difference in regionⅠbetween high-purity and low-purity Y-TZP was explained, then the effects of impurities
on the apparent stress exponent were found out. The rate controlling mechanism in superplasticity was also analyzed from the point of activation energy. The
superplastic characteristics of Si3N4 covalent ceramics enhanced by intergranular glass phase was studied, hence the role of the intergranular glass
phase in superplasticity was defined. The superplastic behavior of other ceramic materials, including Al2O3, aluminium based composites, covalent ceramic
materials and nano-structured ceramics were also summarized.

Key words: ceramics, superplasticity, deformation mechanism, glassy phase

中图分类号: