金属离子和柠檬酸的配比对Y_(2)O_(3)-MgO纳米粉体及其纳米复相陶瓷性能的影响  

Effect of Ratio of Metal Ions to Citric Acid on Properties of Y_(2)O_(3)-MgO Nano-Powders and Ceramic Nano Composites

作　　者：陈冠宇 吴南 杨康 王元帅 孙旭东 李晓东[1,2] CHEN Guanyu;WU Nan;YANG Kang;WANG Yuanshuai;SUN Xudong;LI Xiaodong(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Key Laboratory for Anisotropy and Texture of Materials Ministry of Education,Northeastern University,Shenyang 110819,China;School of Mechanical Engineering,Shenyang University,Shenyang 110044,China;Foshan Graduate School,Northeastern University,Foshan 528311,China)

机构地区：[1]东北大学材料科学与工程学院,沈阳110819 [2]东北大学材料各向异性与织构教育部重点实验室,沈阳110819 [3]沈阳大学机械工程学院,沈阳110044 [4]东北大学佛山研究生院,佛山528311

出　　处：《硅酸盐通报》2022年第5期1788-1796,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划项目(2017YFB0310300);教育部基本科研业务费(N180212009);国家自然科学基金(51872033)。

摘　　要：纳米粉体的团聚程度影响纳米复相陶瓷的微观结构,进而影响其光学与力学性能。本文采用溶胶-凝胶法合成Y_(2)O_(3)-MgO纳米粉体,结合热压烧结(HP)技术制备出光学及力学性能优异的Y_(2)O_(3)-MgO复相陶瓷。研究了前驱体中金属离子与柠檬酸的摩尔比(m/c)对纳米粉体团聚程度及复相陶瓷显微结构、光学及力学性能的影响。研究结果表明,当金属离子和柠檬酸摩尔比为0.75时,粉体团聚程度最低,该粉体经过热压烧结后制备出的Y_(2)O_(3)-MgO陶瓷具有均匀的相域,晶粒尺寸约为140 nm,3~6μm波段的透过率达到80%,维氏硬度及断裂韧性分别为10.90 GPa、2.21 MPa·m^(-1/2),抗弯强度为226 MPa。The agglomeration state of nano-powders affects the microstructure of ceramic nano composites,and hence its optical and mechanical properties.In this paper,Y_(2)O_(3)-MgO nano-powder was synthesized by sol-gel method.Y_(2)O_(3)-MgO nano composites with excellent optical and mechanical properties were prepared by using hot pressing sintering(HP).The effects of the molar ratio of metal ions to citric acid(m/c)in the precursor on the agglomeration state of nano-powders and the optical and mechanical properties of the nano composites were studied.For the molar ratio of metal ions to citric acid of 0.75,the agglomeration state of the powder is the lowest.Y_(2)O_(3)-MgO nano composites prepared by hot-pressing sintering have an uniform phase domain,an average grain size of 140 nm,and an in-line transmittance of 80%within 3~6μm wavelength range.Vickers hardness,fracture toughness and bending strength are 10.90 GPa,2.21 MPa·m^(-1/2) and 226 MPa,respectively.

关 键 词：纳米粉体 透明陶瓷 纳米复相陶瓷 Y_(2)O_(3)-MgO 团聚程度 溶胶-凝胶 热压烧结 柠檬酸 

分 类 号：TQ174[化学工程—陶瓷工业]