MoSi_(2)-Lu_(2)O_(3)-Re_(2)O_(3)复合稀土氧化物助剂对Si_(3)N_(4)陶瓷显微结构与力学性能的影响  

Effect of MoSi_(2)-Lu_(2)O_(3)-Re_(2)O_(3) Composite Rare Earth Oxide Additives on the Microstructure and Mechanical Properties of Si_(3)N_(4) Ceramics

作　　者：褚骆靖 韦中华[2] 李镔[2] 黄丹武 邹文劲 陈波 张伟儒 CHU Luojing;WEI Zhonghua;LI Bin;HUANG Danwu;ZOU Wenjing;CHEN Bo;ZHANG Weiru(School of Mechanical and Electrical Engineering,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;Beijing Sinoma Artificial Crystal Research Institute Co.Ltd.,Beijing 100018,China;Sinoma High-tech Nitride Ceramics Co.,Ltd.,Zibo 255000,Shandong,China;Sinoma High-tech Materials Co.,Ltd.,Beijing 100102,China)

机构地区：[1]广东工业大学机电工程学院,广东广州510006 [2]北京中材人工晶体研究院有限公司,北京100018 [3]中材高新氮化物陶瓷有限公司,山东淄博255000 [4]中材高新材料股份有限公司,北京100102

出　　处：《中国陶瓷工业》2022年第3期1-6,共6页China Ceramic Industry

基　　金：国家重点研发计划(2017YFB0310602)。

摘　　要：通过阿基米德排水法、SEM、XRD、三点弯曲法、压痕法等手段,研究添加不同Re(Re=Sm,Er,Yb,Lu)阳离子半径的复合稀土氧化物助剂MoSi_(2)-Lu_(2)O_(3)-Re_(2)O_(3)制备氮化硅陶瓷的显微结构与力学性能。结果表明,氮化硅陶瓷的室温抗弯强度随添加的Re阳离子半径的增加表现出增大的趋势,最高达(952.1±59.1)MPa;氮化硅陶瓷致密度在98.6%—98.9%,维氏硬度均大于16 GPa,断裂韧性为(6.6±0.3)MPa·m^(1/2)-(7.1±0.2)MPa·m^(1/2);氮化硅陶瓷晶粒的长径比随添加的Re阳离子半径增加表现出增大的趋势,晶粒的径向尺寸随添加的Re阳离子半径的增加表现出减小的趋势。The microstructure and mechanical properties of Si_(3)N_(4) ceramics prepared by composite rare earth oxide additives MoSi_(2)-Lu_(2)O_(3)-Re_(2)O_(3)with different Re(Re=Sm,Er,Yb,Lu)cationic radii are studied through Archimedes drainage,SEM,XRD,three-point bending and indentation methods.The results show that the room temperature bending strength of Si_(3)N_(4) ceramics increases with the increase of Re cation radius,and the maximum bending strength is(952.1±59.1)MPa.the density of Si_(3)N_(4) ceramics is between 98.6%—98.9%,the Vickers hardness is more than 16 GPa,and the fracture toughness is(6.6±0.3)MPa·m^(1/2)-(7.1±0.2)MPa·m^(1/2).The grain aspect ratio of Si_(3)N_(4) ceramics increases with the increase of Re cation radius,and the grain radial size decreases with the increase of Re cation radius.

关 键 词：Si_(3)N_(4)陶瓷 复合稀土氧化物 显微结构 力学性能 热压烧结 烧结助剂 

分 类 号：TQ174.75[化学工程—陶瓷工业]