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无机材料学报

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MgAlON陶瓷的合成热力学与相关性能

王习东; 王福明; 李文超   

  1. 北京科技大学理化系 北京 100083
  • 收稿日期:2001-12-14 修回日期:2002-02-19 出版日期:2003-01-20 网络出版日期:2003-01-20

Synthesis Thermodynamics and Properties of MgAlON Ceramics

WANG Xi-Dong; WANG Fu-Ming; LI Wen-Chao   

  1. Department of Physical Chemistry; University of Science and Technology Beijing; Beijing 100083; China
  • Received:2001-12-14 Revised:2002-02-19 Published:2003-01-20 Online:2003-01-20

PDF (PC)

1284

被引次数

26

摘要： 评估、计算了Mg-Al-O-N系的热力学性质,并绘制了热力学参数状态图.在此基础上,合成了MgAlON陶瓷.对所合成材料的显微结构、晶体特征、物理性能及其抗氧化性能等进行了试验测定.所合成的MgAlON经X射线衍射和透射电镜分析未发现杂相,高分辨电镜分析发现MgAlON晶界无玻璃相,晶粒间为直接结合.试验得出了一套MgAlON的X射线衍射的指标化结果.MgAlON的三点抗弯强度在室温至1723K温度内都很高.MgAlON氧化过程的表观反应活化能为260kJ/mol,表观扩散活化能为573kJ/mol.

关键词: MgAlON, 合成, 热力学, 性能

Abstract: he thermodynamic properties of Mg-Al-O-N system were evaluated and the phase stability diagram of MgAlON was
established. Based on the thermodynamic analysis, MgAlON with different compositions was synthesized. The microstructures, crystalline
characteristics, mechanical properties and oxidation resistance of the synthesized materials were experimentally measured and discussed.
A standard diffraction file of MgAlON was suggested. X-ray diffraction and TEM analysis show that there is no other phase than MgAlON
detected. HREM analysis of MgAlON indicates that there is no glass phase existed at the grain boundaries, the grains are bounded directly.
Three-point bending strength of MgAlON keeps very high until 1723K. Oxidation experiments of MgAlON show that the activation energies of oxidation during the chemical
reaction rate controlling stage and that during the diffusion controlling stage are 260 kJ/mole and 573 kJ/mole, respectively.

Key words: MgAlON, synthesis, thermodynamics, properties

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