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Fabrication of Aluminum Oxynitride (γ‐ AlON ) Transparent Ceramics with Modified Gelcasting

2014; Wiley; Volume: 97; Issue: 5 Linguagem: Inglês

10.1111/jace.12853

1551-2916

Jun Wang, Fang Zhang, Feng Chen, Hailong Zhang, Run Tian, Manjiang Dong, Juan Liu, Zhao Zhang, Jian Zhang, Shiwei Wang,

Semiconductor materials and devices

Transparent aluminum oxynitride ( AlON ) ceramics have been prepared through aqueous gelcasting forming technique starting from the raw materials of single phase AlON powders. The powder was specially treated for anti‐hydrolysis in ethanol before the shaping technique. The surface‐treated AlON powders could then be dispersed in an aqueous‐organic solution to prepare stable slurries containing 35 vol% solids loading. The obtained stable slurries were subsequently casted, calcined, and pressureless sintered at 1950°C for 8 h in nitrogen atmosphere. High transparent AlON ceramics with an average grain size of 112 μm and the in‐line transmittance of 81% at wavelength 1100 nm have been obtained.