光悬浮区熔定向凝固Al_(2)O_(3)/Er_(3)Al_(5)O_(12)和Al_(2)O_(3)/Yb_(3)Al_(5)O_(12)共晶陶瓷的制备与性能研究  

Directionally Solidified Al_(2)O_(3)/Er_(3)Al_(5)O_(12) and Al_(2)O_(3)/Yb_(3)Al_(5)O_(12) Eutectic Ceramics Prepared by Optical Floating Zone Melting

作　　者：孙鲁超[1] 周翠 杜铁锋 吴贞[1] 雷一明 李家麟[1] 苏海军[3] 王京阳[1] SUN Luchao;ZHOU Cui;DU Tiefeng;WU Zhen;LEI Yiming;LI Jialin;SU Haijun;WANG Jingyang(Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]中国科学院金属研究所,沈阳材料科学国家研究中心,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016 [3]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《无机材料学报》2021年第6期652-658,共7页Journal of Inorganic Materials

基　　金：The State Key Laboratory of Solidification Processing(Northwestern Polytechnical University)(SKLSP201909);National Science and Technology Major Project(2017-VI-0020-0093);National Natural Science Foundation of China(51772302);International Cooperation Key Program(174321KYSB20180008)。

摘　　要：本研究探索了光悬浮区熔法制备Al_(2)O_(3)/Er_(3)Al_(5)O_(12)(ErAG)和Al_(2)O_(3)/Yb_(3)Al_(5)O_(12)(YbAG)定向凝固共晶陶瓷。在10 mm/h的抽拉速率下成功获得了凝固组织均匀、内部无裂纹或孔洞的高质量共晶陶瓷。通过高分辨三维X射线衍射仪研究了Al_(2)O_(3)和RE_(3)Al_(5)O_(12)在三维空间的分布与组织结构;利用电子背散射衍射技术分析了定向凝固末期Al_(2)O_(3)和RE3Al5O12两相的晶体学择优取向和相界面关系。力学性能表征结果显示,Al_(2)O_(3)/ErAG和Al_(2)O_(3)/YbAG具有优异的力学性能,二者的维氏硬度分别为(13.5±0.4)和(12.8±0.1)GPa;断裂韧性分别为(3.0±0.2)和(3.2±0.1)MPa·m^(1/2)。Al_(2)O_(3)/Er_(3)Al_(5)O_(12)(ErAG)and Al_(2)O_(3)/Yb_(3)Al_(5)O_(12)(YbAG)eutectic rods with fine and homogeneous microstructure,free from cracks or pores,were directionally solidified using optical floating zone method at growth rate of 10 mm/h.The crystallographic orientation,preferred orientation,and 3D distribution of Al_(2)O_(3) and Er_(3)Al_(5)O_(12)/Yb_(3)Al_(5)O_(12) phases in the terminal growth zone of Al_(2)O_(3)/ErAG and Al_(2)O_(3)/YbAG eutectics were investigated by EBSD and high-resolution X-ray microscope.Vickers hardness of the as-prepared Al_(2)O_(3)/ErAG and Al_(2)O_(3)/YbAG eutectics are determined as(13.5±0.4)and(12.8±0.1)GPa,respectively.The fracture toughness results of Al_(2)O_(3)/ErAG and Al_(2)O_(3)/YbAG are(3.0±0.2)and(3.2±0.1)MPa·m^(1/2),respectively.

关 键 词：定向凝固 共晶陶瓷 显微结构 力学性能 

分 类 号：TQ174[化学工程—陶瓷工业]