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无机材料学报

无机材料学报

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热压烧结TiB2陶瓷的显微结构和力学性能研究

罗学涛1; 谢小林1; 袁润章2   

  1. 1. 南昌航空工业学院材料科学与工程系; 南昌 330034; 2. 武汉工业大学材料复合新技术国家重点实验室; 武汉 430070
  • 收稿日期:1999-05-21 修回日期:1999-07-01 出版日期:2000-06-20 网络出版日期:2000-06-20

Microstructure and Mechanical Properties of Hot-pressed TiB2 Ceramics

LUO Xue-Tao1; XIE Xiao-Lin1; YUAN Run-Zhang2   

  1. 1. Dept. of Materials Science; Nanchang Institute of Aeronautical Technology; Nanchang 330034; China; 2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing; Wuhan University of Technology, Wuhan 430070, China
  • Received:1999-05-21 Revised:1999-07-01 Published:2000-06-20 Online:2000-06-20

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摘要： 以Y2O3－Al2O3为烧结助剂，通过热压制备了TiB2陶瓷，研究了烧结温度、烧结时间和晶化处理对材料的显微结构和力学性能的影响．实验结果表明，随着烧结温度的升高，烧结体失重增加，其抗弯强度和断裂韧性降低；烧结时间延长，其显微结构的均匀性降低，对力学性能不利．晶粒直径对TiB2陶瓷的力学性能有重要影响．晶化处理能够导致晶界拆出YAG相，从而提高TiB2陶瓷的高温抗弯强度．

关键词: TiB2陶瓷, 显微结构, 力学性能, 晶化处理

Abstract: TiB2 ceramics with Y2O3-Al2O3 as sintering aids were fabricated by hot-pressing. The effects of sintering temperature, holding time, and crystallization
annealing on microstructure and mechanical properties were investigated. The experimental results show that the flexural strength and fracture toughness of TiB2 ceramics
decrease and the weight loss increases with sintering temperature rising up; with holding time prolonged, the uniformity of microstructure decreases and
this is disadvantageous to the mechanical properties. The grain diameter has a significant influence on the mechanical properties of TiB2 ceramics. The
crystallization annealing can result in YAG phase from grain boundaries and enhance the flexural strength at high temperature of TiB2 ceramics.

Key words: TiB2 ceramics, microstructure, mechanical properties, crystallization annealing

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