MgAlON-Al_(2)O_(3)复相陶瓷的热压烧结制备及性能  

Preparation and Properties of MgAlON-Al_(2)O_(3) Composite Ceramics by Hot Pressing Sintering

作　　者：徐勇 靖正阳[1,2] 陈浩 陈博文 涂兵田[1,2] 王皓 XU Yong;JING Zhengyang;CHEN Hao;CHEN Bowen;TU Bingtian;WANG Hao(State Key Lab of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;Hubei Longzhong Laboratory,Wuhan University of Technology Xiangyang Demonstration Zone,Xiangyang 441000,China)

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070 [2]武汉理工大学襄阳示范区湖北隆中实验室,襄阳441000

出　　处：《硅酸盐通报》2024年第8期3017-3025,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划(2023YFB3812000);国家自然科学基金(52272072);湖北隆中实验室自主创新研究项目(2022ZZ-13)。

摘　　要：MgAlON与α-Al_(2)O_(3)的光学折射率相近,两种材料构成的复相陶瓷有望在保持较好光学性能的同时获得优化的显微结构及机械和热性能。本研究基于Van-de-Hulst理论对MgAlON-Al_(2)O_(3)复相陶瓷的光学透过行为进行预测,发现其理论直线透过率随α-Al_(2)O_(3)含量降低和晶粒尺寸减小而增大,且在波长为2μm处达86%。在热压烧结制备的复相陶瓷中,α-Al_(2)O_(3)通过晶界钉扎效应有效抑制了MgAlON晶粒的长大。随着烧结温度升高,复相陶瓷中的α-Al_(2)O_(3)含量下降,陶瓷的光学透过率上升,机械性能和热导率降低。1 500~1 650℃烧结的1 mm厚样品在波长为4μm处的最大直线透过率大于72.6%。其中,1 600℃烧结样品的最大直线透过率为76.1%,弹性模量为321.69 GPa,硬度为15.93 GPa,四点抗弯强度为268.09 MPa,断裂韧性为2.41 MPa·m^(1/2),热导率为13.98 W·m^(-1)·K^(-1)。MgAlON andα-Al_(2)O_(3) have comparable optical refractive indices,and the composite ceramics composed of two materials are expected to obtain optimized microstructures,mechanical and thermal properties while maintaining reasonable optical properties.In this study,the optical transmittance behavior of MgAlON-Al_(2)O_(3) composite ceramics were predicted based on Van-de-Hulst theory,and it is found that the theoretical in-line transmittance increases with the decrease of content and grain size ofα-Al_(2)O_(3),and it can reach 86%at the wavelength of 2μm.In the composite ceramics prepared by hot-press sintering,α-Al_(2)O_(3) effectively inhibites the grain growth of MgAlON through grain boundary pinning effect.As the sintering temperature increases,α-Al_(2)O_(3) content in the composite ceramics decreases.At the same time,the optical transmittance of ceramics increases,while the mechanical properties and thermal conductivity decrease.The maximum in-line transmittance of sintered samples with 1 mm thickness from 1500℃to 1650℃is greater than 72.6%at a wavelength of 4μm.Among them,1600℃sintered sample shows the maximum in-line transmittance of 76.1%,elastic modulus of 321.69 GPa,hardness of 15.93 GPa,four-point fracture strength of 268.09 MPa,fracture toughness of 2.41 MPa·m^(1/2),and thermal conductivity of 13.98 W·m^(-1)·K^(-1).

关 键 词：MgAlON-Al_(2)O_(3) 钉扎效应 显微结构 Van-de-Hulst理论 光学性能 机械性能 

分 类 号：TQ174[化学工程—陶瓷工业]