High transmittance and grain-orientated alumina ceramics fabricated by adding fine template particles

• 作者: Han CHEN Jin ZHAO Shunzo SHIMAI Xiaojian MAO Jian ZHANG Guohong ZHOU Shiwei WANG Na GU Kai ZHENG
• 来源期刊: 先进陶瓷（英文版）
• 年，卷（期）: 2022,（4）
• 所属期刊栏目: Research Article
• 页码范围: 582-588
• 页数: 7页
• 语种: 英文

摘要

Transparent Al2O3 ceramics with grains aligned to the c-axis were prepared by adding platelets with a low aspect ratio into fine equiaxed particles.The mixed powders were formed into green bodies using spontaneous coagulation casting and sintered by pressureless sintering and hot-isostatic pressure sintering.Zeta potentials and rheological behavior of the slurries,relative densities of green bodies,and orientation and optical properties of sintered bodies were investigated and discussed.The platelet with a high aspect ratio suppressed densification more seriously during sintering than the one with a low aspect ratio.An excellent oriented structure was obtained when 5 wt％platelets with a low aspect ratio were added,and transparent Al2O3 ceramics with grains aligned to c-axis were successfully prepared;the in-line transmittance was 78.4％at 600 nm,which is the highest one in the currently reported literature.