摘要
采用固相反应法用不同的烧结速率在1850℃烧结合成过烧钇铝石榴石(YAG)陶瓷,YAG陶瓷晶界形貌随烧结速率的变化而不同。高纯的α-Al_2O_3和Y_2O_3原料粉体经高能球磨在1400℃空气中煅烧,生成主相为YAG相的多相粉体化合物。真空烧结YAG陶瓷时烧结速率800℃/h并在1850℃真空烧结4h会使陶瓷中晶粒长大不充分,晶粒与晶粒之间仍保留明显的面接触,陶瓷内部残存大量直径约1μm的气孔,尺寸与可见光波长接近,对透过率的影响大,陶瓷成半透明;在以100℃/h升至1850℃真空烧结4h的YAG多晶陶瓷半透明化,陶瓷晶粒粗大,晶界宽化且保留熔融态凝固,用TEM及EDS确认晶界处存在α-Al_2O_3和钙钛型YAP共晶相。
Oversintered YAG ceramics were synthesized at different sintering rates by solid-state reaction method at 1850 ℃, and the morphology of YAG ceramics grain boundary changed with different heating rates. Super pureα-Al2O3 and Y2O3 powder was calcined in air at 1400℃after milling, the main phase of calcined powder was YAG. With vacuum sintering YAG ceramics heating rate from 800 ℃/h to 1850 ℃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 11.tm 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 ℃/h to 1850 ℃ vacuum sintering for 4 h, grain grows large and grain boundary widens which remains melting solidification, there are α-Al2O3 and perovskite YAP eutectics in the grain boundary by TEM and EDS techniques
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A02期442-445,共4页
Rare Metal Materials and Engineering
基金
国防"十五"预研基金(41312040404)
