透明AlON陶瓷凝胶浇注成型及其无压烧结制备  

Fabrication of Transparent AlON by Gel Casting and Pressureless Sintering

作　　者：靳喜海[1,2] 董满江 阚艳梅[1,2] 梁波 董绍明[1,2] JIN Xihai;DONG Manjiang;KAN Yanmei;LIANG Bo;DONG Shaoming(Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050 [2]中国科学院大学材料科学与光电工程中心,北京100049 [3]燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛066004

出　　处：《无机材料学报》2023年第2期193-198,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(51872310)。

摘　　要：透明AlON具有优异的光学和力学性能,应用前景广阔。但材料制备成本高昂,限制了其应用发展。为解决上述问题,本研究以透明AlON的凝胶浇注成型与无压烧结制备为核心目标,就AlON细粉的低温合成及其抗水化处理展开重点研究。研究发现以有机聚合物包覆AlN/Al_(2)O_(3)为原料,通过高温碳热–氮化工艺合成AlON,可有效降低AlON的合成温度,在1700℃即可合成近乎纯相的AlON粉体。所得粉体颗粒尺寸细小,在亚微米级。通过对上述粉体进行聚氨酯包覆表面抗水化处理,可大幅度提升其抗水化性能。即使历经长达72 h水中静置,也不发生明显的水解。以此为基础,通过凝胶浇注成型结合生坯的冷等静压后处理在1820~1850℃成功实现了透明AlON陶瓷的无压烧结制备。材料力学和光学性能优异,其中1850℃烧结试样在紫外–中红外波段直线透过率达到83.1%~86.2%,三点抗弯强度达到310 MPa。Transparent AlON possesses good mechanical and optical properties,which shows great potential for application.However,high fabrication cost seriously restricts its wide usage.To solve this problem,gel-casting and pressureless sintering of transparent AlON was tentatively studied here,with emphasis on low temperature synthesis and anti-hydrolysis treatment of AlON powder.It was found that fine AlON powder could be readily synthesized at a low temperature of 1700℃by a novel carbothermal nitridation technique,using polymer coated AlN/Al_(2)O_(3)mixture as the starting materials.The powder obtained was submicron in size and its hydrolysis resistance could be significantly improved after surface coating with a polyurethane layer.On the basis of these findings,transparent AlON ceramics was successfully prepared through gel-casting and pressureless sintering.The material sintered at 1850℃showed good optical and mechanical properties,with a high in-line transmittance of 83.1%–86.2%from ultraviolet to mid-infrared and three-point bending strength of 310 MPa.

关 键 词：透明陶瓷 ALON 粉体合成 抗水化处理 凝胶浇注 无压烧结 

分 类 号：TB333[一般工业技术—材料科学与工程]