MgO对AlON陶瓷微观组织结构及性能的影响  

Influence of MgO on the Microstructure and Properties of AlON Ceramics

作　　者：贾晓彤 张朝晖[1,2] 刘罗锦 王强 何杨宇 周金朝 程兴旺[1,2] JIA Xiaotong;ZHANG Zhaohui;LIU Luojin;WANG Qiang;HE Yangyu;ZHOU Jinzhao;CHENG Xingwang(School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China;Tangshan Key Laboratory of High-Performance Metals and Ceramics,Tangshan Research Institute BIT,Tangshan,Hebei 063000,China)

机构地区：[1]北京理工大学材料学院,北京100081 [2]北京理工大学唐山研究院唐山市特种金属与陶瓷材料重点实验室,河北唐山063000

出　　处：《北京理工大学学报》2024年第12期1317-1322,共6页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(51374039)。

摘　　要：研究MgO对AlON陶瓷微观组织结构和性能的影响规律.以Al2O3和AlN为原料,利用放电等离子烧结技术制备AlON陶瓷,对添加不同质量分数MgO的AlON陶瓷的致密度、断口、晶粒尺寸和孪晶比例进行分析.结果表明,随着MgO质量分数的增加,AlON陶瓷的致密度先增加后趋于稳定,晶粒尺寸先减小后趋于稳定.适量MgO的加入能够有效减缓晶界迁移速率,促进气孔的排除并抑制晶粒长大.此外,MgO的存在能够促进AlON陶瓷中孪晶的形成.当复合烧结助剂中MgO质量分数为0.30%时,所得AlON陶瓷具有致密的结构、细小均匀的晶粒以及一定数量的孪晶,这些均为AlON陶瓷优异的性能提供了微观组织结构保障,其硬度、弯曲强度、断裂韧性和透过率分别为18.19 GPa、505 MPa、5.75 MPa·m^(1/2)和79%(波长4μm处).To study the influence of MgO on the microstructure and properties of AlON ceramics,some AlON ceramics were synthesized based on spark plasma sintering technology from Al2O3 and AlN powders,analyzing the relative density,fracture surface,grain size,and twin content of AlON ceramics with varying MgO content.The results show that with increasing MgO content,the relative density of AlON ceramics increases initially and then stabilizes,while the grain size decreases first and then stabilizes.Increasing MgO suitably,the grain boundary migration can be slowed effectively,pore elimination can be facilitated and grain growth can be inhibited.Additionally,MgO can promote the formation of twins within the AlON ceramics.When the MgO content reaches 0.30 wt%in the composite sinter aids,the gained AlON ceramics exhibit a compact structure,finely uniform grains,and a certain quantity of twins.These microstructure attributes can ensure the excellent performance of AlON ceramics,with a hardness of 18.19 GPa,a bending strength of 505 MPa,a fracture toughness of 5.75 MPa·m^(1/2),and a transmittance of 79%at a wavelength of 4μm.

关 键 词：ALON陶瓷 MGO 微观组织结构 力学性能 

分 类 号：TB321[一般工业技术—材料科学与工程]