Preparation of Aluminum Oxynitride Spinel γ-ALON Powders and Transparent Ceramics

Abstract:

With AlN, Al2O3 and Al powders as starting materials, ALON powders were prepared by high temperature solid state reaction at 1650°C, 1750°C and 1850°C respectively. Nitrogen gas at 1atm was selected as reaction atmosphere. X-ray diffraction analysis and scanning electron microscope analysis were carried out for the as-prepared ALON powders. In this paper, single-component γ-ALON porous materials were obtained at temperatures below 1800 degree with void ratio more than 75%, which is prone to be grinded to powders less than 1μm and applicable for the preparation of transparent ceramics. Aluminum oxynitride spinel γ-ALON transparent ceramics were successfully obtained with the as-prepared ALON powders. The volume density of the transparent ceramics was 3.67g/cm2, which is 99.3 percent of the theoretical density of γ-ALON materials. The bending strength of the transparent ceramics was 296MPa and the transmittance was about 75% in the wavelength range of 1.2 to 5.3μm.

• Periodical: Advanced Materials Research (Volumes 105-106)
• Pages: 582-584
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.105-106.582
• Online since: April 2010
• Authors: Cheng Gong Sun, Jin Ye Niu, Chong Hai Wang, Chang Ling Zhou, Bao Lin Feng, Jie Fan, Yan Yan Wang, Jian Shan Hao
• Keywords: Aluminum Oxynitride (AlON), Transparent Ceramic, γ-Alon

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