Highly transparent AlON ceramics sintered from powder synthesized by carbothermal reduction nitridation
Highly transparent AlON ceramics sintered from powder synthesized by carbothermal reduction nitridation
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DOI：
10.1016/j.ceramint.2016.02.041
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发表时间：
2016-05-15
影响因子：
5.2
通讯作者：
Guo, Jingkun
中科院分区：
文献类型：
--
作者：
Liu, Qiang;Jiang, Nan;Guo, Jingkun
以工业γ-Al 2 O3和炭黑为原料，采用碳热还原氮化法合成了氮氧化铝（AlON）粉体。在氮气保护下，采用无压烧结法制备了AlON透明陶瓷。研究了球磨时间对AlON粉体的形貌、粒度分布以及AlON透明陶瓷的显微结构和光学性能的影响。结果表明，γ-Al 2 O3/C混合物在1550 ℃下煅烧1 h，然后在1750 ℃下热处理2 h，得到单相AlON粉末。球磨24 h的AlON粉体颗粒较小，粒径分布较窄，有利于AlON透明陶瓷光学性能的提高。以0.25wt%MgO和0.04wt%Y2O3为助烧剂，在1850 ℃下烧结6 h，获得了可见光至红外线透过率在80%以上的高透明AlON陶瓷。(C)2016 Elsevier Ltd和Techna Group S.r.l. All rights reserved.
Aluminum oxynitride (AlON) powders were synthesized by the carbothermal reduction and nitridation process using commercial gamma-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 gamma-Al2O3/C mixture at 1550 degrees C for 1 h and a following heat treatment at 1750 degrees 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 degrees C for 6 h. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.