Highly transparent AlON ceramics sintered from powder synthesized by carbothermal reduction nitridation

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• 作者：Qiang Liu^a ; Nan Jiang^a ; ^b ; Jiang Li^b ; ^{lijiang@mail.sic.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Kun Sun^a ; ^b ; Yubai Pan^b ; ^c ; ^{ybpan@mail.sic.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Jingkun Guo^b
• 关键词：AlON transparent ceramics ; AlON powders ; Carbothermal reduction nitridation ; Ball milling time ; Optical transparency
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 May 2016
• 年：2016
• 卷：42
• 期：7
• 页码：8290-8295
• 全文大小：3752 K

文摘

Aluminum oxynitride (AlON) powders were synthesized by the carbothermal reduction and nitridation process using commercial γ-Al₂O₃ and carbon black powders as starting materials. And AlON transparent ceramics were fabricated by pressureless sintering under nitrogen atmosphere. The effects of ball milling time on morphology and particle size distribution of the AlON powders, as well as the microstructure and optical property of AlON transparent ceramics were investigated. It is found that single-phase AlON powder was obtained by calcining the γ-Al₂O₃/C mixture at 1550 °C for 1 h and a following heat treatment at 1750 °C for 2 h. The AlON powder ball milled for 24 h showed smaller particles and narrower particle size distribution compared with the 12 h one, which was benefit for the improvement of optical property of AlON transparent ceramics. With the sintering aids of 0.25 wt% MgO and 0.04 wt% Y₂O₃, highly transparent AlON ceramics with in-line transmittance above 80% from visible to infrared range were obtained through pressureless sintering at 1850 °C for 6 h.