Analysis of grain boundary of oversintered Y3Al5O12 ceramics

作者：Li Changqing^*; Zuo Hongbo; Zhang Mingfu; Han Jiecai; Meng Songhe

来源：Rare Metal Materials and Engineering, 2007, 36: 442-445.

• YAG
• grain boundary
• eutectics
• perovskite

Oversintered YAG ceramics were synthesized at different sintering rates by solid-state reaction method at 1850 degrees C, and the morphology of YAG ceramics grain boundary changed with different heating rates. Super pure alpha-Al2O3 and Y2O3 powder was calcined in air at 1400 degrees C after milling, the main phase of calcined powder was YAG. With vacuum sintering YAG ceramics heating rate from 800 degrees C/h to 1850 degrees C for 4 h, the grain in the ceramics grows not larger enough, surface contact remained among grains, lots of pores left inside ceramics and the diameter of pores is about 1 mu m which dimension is same order to visible light wavelength, which made YAG ceramics' transmittance decrease to translucent. Translucent YAG ceramics was fabricated by heating rate 100 degrees C/h to 1850 degrees C vacuum sintering for 4 h, grain grows large and grain boundary widens which remains melting solidification, there are alpha-Al2O3 and perovskite YAP eutectics in the grain boundary by TEM and EDS techniques.

• 出版日期2007-8
• 单位哈尔滨工业大学