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无机材料学报

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纳米Y-TZP材料烧结过程晶粒生长的分析

李蔚; 高濂; 归林华; 郭景坤   

  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:1999-04-13 修回日期:1999-05-28 出版日期:2000-06-20 网络出版日期:2000-06-20

Analysis of the Grain Growth of Nano Y-TZP Materials

LI Wei; GAO Lian; GUI Lin-Hua; GUO Jing-Kun   

  1. State Key Lab on High Performance Ceramics & Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:1999-04-13 Revised:1999-05-28 Published:2000-06-20 Online:2000-06-20

PDF (PC)

1586

被引次数

102

摘要： 分析了无压烧结、热压烧结及SPS烧结过程中晶粒生长的行为及表现活化能．结果表明：在1100～1300℃之间，纳米Y-TZP材料在以上几种烧结条件下的晶粒生长行为不同．无压烧结时晶粒生长较慢，而热压烧结和SPS烧结时晶粒生长较快．对晶粒生长的活化能分析可在一定程度上解释以上现象．分析结果显示：无压烧结的表观活化能为281kJ／mol与纳米Y－TZP材料的晶界扩散活化能相近；热压烧结过程中，由于外压对扩散的促进作用，活化能比无压烧结时略有降低；在SPS烧结过程中，由于外加的脉冲电流能使晶粒表面大大活化，所以活化能与无压烧结相比大幅度下降．

关键词: 纳米Y－TZP材料, 烧结, 晶粒生长

Abstract: The behavior and activation energy of the grain growth of the nano Y-TZP materials during pressureless sintering, hot-pressing and SPS were analyzed. It was found
that from 1100℃ to 1300℃, the grain growth behaviour for the three sintering methods is different. When sintered by hot-pressing and SPS, the grain
grows faster than that by pressureless sintering. These phenomena can be partly explained by the activation energy of the grain growth. The activation energy
of the grain growth during pressureless sintering is about 300kJ/mol. During hot-pressing, the activation energy is less than that during pressureless sintering
because of the promoting of the applied stress on the diffusion. During SPS processing, the surfaces of particles are activated by pulsed current, so the activation energy
is significantly decreased.

Key words: nano Y-TZP materials, sintering, grain growth

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