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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

冲击波合成立方氮化硅的烧结稳定性研究

姚怀1, 徐巧玉2,齐鑫3, 唐敬友4, 刘海洋1, 苌清华1   

  1. (1. 河南科技大学材料科学与工程学院, 洛阳 471003; 2.河南科技大学机电工程学院, 洛阳 471003; 3. 哈尔滨理工大学计算机科学与技术学院,哈尔滨 150080; 4.西南科技大学材料科学与工程学院, 绵阳 621010)
  • 收稿日期:2007-09-05 修回日期:2007-11-28 出版日期:2008-07-20 网络出版日期:2008-07-20

Research on Sintering Stability of Cubic Silicon Nitride Synthesized by Shock-wave

YAO Huai1, XU Qiao-Yu2, QI Xin3, TANG Jing-You4, LIU Hai-Yang1, CHANG Qing-Hua1   

  1. (1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China; 2. School of Electromechnical Engineering, Henan University of Science and Technology, Luoyang 471003, China; 3. School of Computer Science and Technology, Harbin University of Science and Technology, Harbin 150080, China; 4. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China)
  • Received:2007-09-05 Revised:2007-11-28 Published:2008-07-20 Online:2008-07-20

PDF (PC)

1828

被引次数

5 | 2

摘要： 以冲击波合成的γ-Si3N4粉体为原料, Y2O3-Al2O3-La2O3体系作烧结助剂, 在5.7GPa、1370~1670K的高温高压条件下, 进行了γ-Si3N4粉体的烧结. 研究了不同烧结温度对γ-Si3N4稳定性、相对密度、力学性能及显微结构的影响. 结果表明: γ-Si3N4在 1420~1670K的条件下, 完全相变为β-Si3N4, 在1370K左右的条件下, 发生部分向β-Si3N4相变. 在5.7GPa, 1370K的条件下, 烧结样品的相对密度与维氏硬度分别为98.83%和21.09GPa.

关键词: 冲击波合成, 高温高压, 烧结, 相变, 稳定性

Abstract: Silicon nitride ceramics was prepared by super-high pressure using the γ-Si3N4 powders synthesized by the shock-wave technique as raw materials and with Y2O3-Al2O3-La2O3 mixtures as additives at 5.7GPa from 1370K to 1670K. The stability, relative density, mechanical properties and microstructure of the compacts synthesized at different temperatures were investigated. The results show that γ-Si3N4 is completely transformed to β-Si3N4 at temperature from 1420K to 1670K,
and partly transformed to β-Si3N4 at 1370K. Micro-analysis indicates that the typical microstructure of sintered Si3N4 is mainly composed of β-Si3N4 rod crystals with disordered orientation and uniform microstructures. The relative density
and Vickers hardness in the as-sintered (5.7GPa, 1370K) samples are 98.83% and 21.09GPa, respectively.

Key words: shock wave synthesis, high pressure and high temperature, sintering, phase transition, stability

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