高等学校化学学报

高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (9): 1257.

• 研究论文 • 上一篇    下一篇

ZrO2烧结动力学研究

吴文芳, 葛启录, 李桂芝, 卢湛硭, 吴危杭   

  1. 哈尔滨工业大学应用化学系, 哈尔滨 150006
  • 收稿日期:1992-09-04 修回日期:1993-03-25 出版日期:1993-09-24 发布日期:1993-09-24
  • 通讯作者: 吴文芳.

Studies on Sintering Kinetics of ZrO2

WU Wen-Fang, GE Qi-Lu, LI Gui-Zhi, LU Zhan-Mang, WU Wei-Hang   

  1. Department of Applied Chemistry, Harbin Institute of Technology, Harbin, 150006
  • Received:1992-09-04 Revised:1993-03-25 Online:1993-09-24 Published:1993-09-24

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摘要： 研究了ZrO2陶瓷的烧结动力学规律,并测量了其烧结激活能.ZrO2粉末烧结时以界面扩散机制为主,粉末越细,致密化过程越快,但其最终烧结密度不变.晶粒长大的临界相对密度为85％,第二相细化晶粒的作用只有在晶界可动之后才能表现出来.ZrO2烧结激活能为595±65kJ/mol,第二相的存在使其明显提高,ZrO2+10vol％Al2O3的烧结激活能达700±50kJ/mol,而添加Y2O3对其几乎没有影响,但明显加快了致密化进程,并对最终致密度的影响存在最佳含量.

关键词: ZrO2, 烧结动力学, 激活能

Abstract: In this paper, the sintering kinetic of ZrO2 was investigated, and the activation energies were also measured.It is found that the mechanism controlled by boundary diffusion is dominant during the densification of ZrO2. The finer the powder is, the faster the densification process is, but the final relative density ramains constant.The critical relative density for grain growth is 85%, and the effect of the second phase on the grain finement can only be shown when the grain boundaries move.The sintering activation energy of ZrO2 is 595 ± 65 kJ/mol, and may be obviously increased owing to the presence of the second phase.The activation energy of 700±50 kJ/mol is estimated in ZrO2 + 10 vol%Al2O3. However, it is not affected by Y2O3 content, but the densification process is clearly accelerated.There is an optinum content of Y2O3 which can influence the final density of ZrO2.

Key words: ZrO2, Sintering kinetics, Activation energy

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