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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Na2O的含量对MoSi2/Oxide系发热元件材料力学性能的影响

王刚1; 江莞1; 赵世柯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. 清华大学材料科学与工程系, 北京 100081
  • 收稿日期:2001-11-26 修回日期:2002-06-25 出版日期:2003-01-20 网络出版日期:2003-01-20

Effect of Na2O on Mechanical Properties of MoSi2/Oxide Composites for Heating Elements

WANG Gang1; JIANG Wan1; ZHAO Shi-Ke2   

  1. 1.State Key Lab of High Performance Ceramics and Superfine Microstructure; Chinese Academy of Sciences; Shanghai 200050; China; 2.Department of Materials Science and Engineering Tsinghua University; Beijing 100081; China
  • Received:2001-11-26 Revised:2002-06-25 Published:2003-01-20 Online:2003-01-20

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摘要： 对比了脱Na处理工艺前后Na2O含量变化对MoSi2/Oxide系发热元件材料力学性能的影响.研究结果表明,虽然Na2O含量的高低对发热体材料常温力学性能影响不大,但是对发热元件材料高温力学性能有重要影响.主要表现在:经1573K热处理100h后脱Na材料仍拥有很高的强度和韦伯分布;而且经过真空脱Na后材料的高温蠕变特性也有了明显改善,在1243和1303K的条件下脱Na材料的蠕变速率分别是未脱Na材料的2/5和1/3以下.另外,Na2O含量对材料延性脆性转变温度(BDTT)也有重要影响,脱Na材料的BDTT较未脱Na材料升高约100K.

关键词: 二硅化钼发热元件, Na2O, 韦伯分布, 蠕变特性, BDTT

Abstract: The effect of Na2O on mechanical properties of MoSi2/oxide composites for heating elements
was investigated. The results obtained show that the specimens with low Na2O content possess higher bending strength and Weibull modulus after
heat treatment at 1773K for 100h. Furthermore, removed Na composites have better creep resistance and higher BDTT. Their creep strain rate is 2/5
and 1/3 or less than that of the unremoved Na composites at 1243K and 1303K, respectively, and their BDTT is increased 100K.

Key words: MoSi2 heating element, Na2O, weibull modulus, creep, BDTT

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