Effect of heat treatment of green bodies on the sintering and optical properties of large-size and thick transparent YAG ceramics
Effect of heat treatment of green bodies on the sintering and optical properties of large-size and thick transparent YAG ceramics
复制标题
坯体热处理对大尺寸厚透明YAG陶瓷烧结及光学性能的影响
DOI：
10.1016/j.ceramint.2020.12.097
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发表时间：
2020-12
影响因子：
5.2
通讯作者：
Yongle Liang
中科院分区：
文献类型：
--
作者：
Chunjun Fang;Zhao Jing;Xianpeng Qin;Jianhua Nie;Guohong Zhou;Song Hu;Zhengjuan Wang;Shiwei Wang;Yongle Liang
以工业生产的高纯氧化物粉末为原料，采用固相反应和真空烧结法制备了尺寸大、厚度大、形状复杂的钇铝石榴石透明陶瓷。在真空烧结前，坯体在马弗炉中以不同温度煅烧。研究了热处理温度对绿体粒径、YAG陶瓷的抗压强度、致密化、相变和光学透明度的影响。经1000℃煅烧后，坯体抗压强度达到81.7 MPa。采用该煅烧工艺，在1750℃下烧结30 h，成功获得了直径120 mm，厚度15 mm的大尺寸厚YAG透明陶瓷圆顶，无微裂纹等明显缺陷。制备的陶瓷在1000 nm和400 nm波长处的在线透光率分别为83.1%和76.8%。这种透明陶瓷圆顶可以用作导弹圆顶或潜水器的透明防护罩，以及全海洋深度（最大深度11000米）的探测设备。
Large-size and thick yttrium aluminum garnet (YAG) transparent ceramics with complex shapes were successfully fabricated by solid-state reaction and vacuum sintering using commercial high-purity oxide powders as starting materials. Before sintering in vacuum, green bodies were calcined at different temperatures in a muffle furnace. The effects of heat treatment temperature on the particle size of green bodies as well as the compressive strength, densification, phase transformation and optical transparency of YAG ceramics were examined. After calcination at 1000 °C, the compressive strength of the green bodies reached 81.7 MPa. Using this calcinating procedure, large-size and thick YAG transparent ceramic dome (120 mm diameter, 15 mm thickness) was successfully obtained by sintering at 1750 °C for 30 h, without any apparent defects including microcracks. The in-line optical transmittance of the as-prepared ceramic was 83.1% and 76.8% at wavelengths of 1000 nm and 400 nm, respectively. Such transparent ceramic domes can be used as missile domes or transparent protective covers for submersibles, and detection equipment at full ocean depth (maximum depth of 11,000 m).
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