浆料固相含量对数字光处理成形SiO2基陶瓷性能的影响  

Effect of Solid Loading of Slurry on Properties of SiO2-based Ceramics Formed by Digital Light Processing

作　　者：于康博 吴甲民 郑雯[1,2,3] 陈双 张洁 刘珩[1,2,3] 文世峰[1,2,3] 闫春泽 史玉升[1,2,3] YU Kangbo;WU Jiamin;ZHENG Wen;CHEN Shuang;ZHANG Jie;LIU Heng;WEN Shifeng;YAN Chunze;SHI Yusheng(School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan430074;State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074;Engineering Research Center of Ceramic Materials for Additive Manufacturing of Ministry of Education,Wuhan 430074)

机构地区：[1]华中科技大学材料科学与工程学院,武汉430074 [2]华中科技大学材料成形与模具技术国家重点实验室,武汉430074 [3]增材制造陶瓷材料教育部工程研究中心,武汉430074

出　　处：《机械工程学报》2023年第1期259-266,共8页Journal of Mechanical Engineering

基　　金：国家科技重大专项资助项目(2017-Ⅶ-0008-0102-1)。

摘　　要：随着国内外航空航天事业的快速发展,硅基陶瓷型芯在制备发动机涡轮叶片中起到越来越重要的作用。本工作以氧化硅(SiO2)粉末和硅酸锆(ZrSiO4)粉末为原材料,通过数字光处理技术(Digital light processing,DLP)制备SiO2基陶瓷,主要研究了陶瓷浆料固相含量对DLP成形SiO2基陶瓷微观组织和性能的影响。随着陶瓷浆料固相含量(体积分数)从50%增加到65%,SiO2基陶瓷中由石英玻璃转变形成的方石英含量逐渐下降,烧结件的晶粒孔隙逐渐减少。DLP成形SiO2基陶瓷的径向收缩率由4.65%下降至1.61%,轴向收缩率由8.35%下降至4.17%;而SiO2基陶瓷的体积密度逐渐提高,气孔率逐渐减小,抗弯强度逐渐上升。最终确定陶瓷浆料的最佳固相含量为65%,此时SiO2基陶瓷的气孔率为25.4%,室温抗弯强度为9.3 MPa,满足硅基陶瓷型芯的性能要求。With the rapid development of aerospace industry,ceramic cores play an important role in the preparation of engine turbine blades.In this work,silica(SiO2)powder and zirconium silicate(ZrSiO4)powder are used as raw materials to prepare SiO2-based ceramics by digital light processing(DLP),and the effects of solid loading of ceramic slurry on the microstructure and properties of SiO2-based ceramics formed by DLP are mainly studied.With the increase of solid loading from 50 vol%to 65 vol%,the content of cristobalite formed by quartz glass transition in SiO2-based ceramics gradually decreases,and the pores of sintered parts decrease significantly.The radial shrinkage of SiO2-based ceramics decreases from 4.65%to 1.61%,and the axial shrinkage decreases from 8.35%to 4.17%;The bulk density and the flexural strength of SiO2-based ceramics increase gradually,while the porosity decreases.Finally,the optimum solid loading of ceramic slurry is 65 vol%.Meanwhile,the porosity of SiO2-based ceramics is 25.4%and the room-temperature flexural strength is 9.3 MPa,which meets the performance requirements of SiO2-based ceramic core.

关 键 词：氧化硅 陶瓷型芯 数字光处理 固相含量 抗弯强度 

分 类 号：TQ174[化学工程—陶瓷工业]