摘要
随着科技的不断发展, Si_(3)N_(4)陶瓷在航空、机械、生物医疗等高新领域发挥着越来越重要的作用。本工作采用包覆助烧剂Al_(2)O_(3)-Y_(2)O_(3)后的Si_(3)N_(4)粉体为原材料,利用数字光处理(Digital light processing, DLP)技术成功制备出Si_(3)N_(4)陶瓷,并系统研究了浆料固相含量对Si_(3)N_(4)陶瓷浆料、DLP成形Si_(3)N_(4)陶瓷素坯和陶瓷性能的影响。研究表明,浆料固相含量低于40.0%(体积分数)时,浆料在30 s;剪切速率下的粘度均小于2 Pa·s,可用于DLP成形。在这种情况下,浆料的单层固化深度随浆料固相含量的增加而减小。随着浆料固相含量的增大,DLP成形Si_(3)N_(4)陶瓷的相对密度和抗弯强度先升高后降低。固相含量为37.5%(体积分数)的样品获得最大的相对密度和抗弯强度,分别为89.8%和162.5MPa,较固相含量为32.5%(体积分数)的样品分别提升了10%和16%。本研究通过对陶瓷浆料性能的优化,提升了DLP成形Si_(3)N_(4)陶瓷的性能,为Si_(3)N_(4)等非氧化物陶瓷光固化成形奠定了实验基础。
With the continuous development of science and technology,Si_(3)N_(4) ceramics are playing an increasingly important role in high-tech fields such as aviation machinery,biology and medical treatment.In this work,Si_(3)N_(4) ceramics were successfully prepared by digital light processing(DLP) technology using Si_(3)N_(4) powder coated with Al_(2)O_(3)-Y_(2)O_(3) as raw material.Effects of solid loading of slurry on the performance of Si_(3)N_(4) ceramic slurry,Si_(3)N_(4) ceramic green parts and Si_(3)N_(4) ceramics were systematically studied.The results showed that when the solid loading of slurry was less than 40.0%(in volume),its viscosity was less than 2 Pa·s at shear rate of 30 s;,which can be used for DLP forming.In that case,the single curing depth of the slurry decreased with the increase of solid loading of the slurry,while the relative density and flexural strength of Si_(3)N_(4) ceramics formed by DLP increased firstly and then decreased.The relative density and flexural strength reached the maximum of 89.8% and 162.5 MPa at solid loading of 37.5%(in volume),which were 10% and 16% higher than those with solid loading of 32.5%(in volume),respectively.In this work,the properties of Si_(3)N_(4) ceramics formed by DLP were optimized by determining the best solid loading,which laid the experimental foundation for the photocuring of non-oxide ceramics such as Si_(3)N_(4).
作者
李萌
黄海露
吴甲民
刘春磊
吴亚茹
张景贤
史玉升
LI Meng;HUANG Hailu;WU Jiamin;LIU Chunlei;WU Yaru;ZHANG Jingxian;SHI Yusheng(State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Engineering Research Center of Ceramic Materials for Additive Manufacturing,Ministry of Education,Wuhan 430074,China;State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第3期310-316,共7页
Journal of Inorganic Materials
基金
国家自然科学基金(51975230)
湖北省技术创新专项重大项目(2019AAA002)
高性能陶瓷和超微结构国家重点实验室开放课题(SKL201903SIC)。
