立体光固化3D打印成型碳化硅陶瓷的烧结特性  

Sintering Characteristics of SiC Ceramics Prepared by Stereolithography 3D Printing

作　　者：崔聪聪[1] 李珊[2] 李伟[1] 包建勋[1] 张舸[1] 王功[2] CUI Congcong;LI Shan;LI Wei;BAO Jianxun;ZHANG Ge;WANG Gong(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;Technology and Engineering Center for Space Utilization,Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033 [2]中国科学院空间应用工程与技术中心,北京100094

出　　处：《硅酸盐通报》2021年第6期1937-1942,1949,共7页Bulletin of the Chinese Ceramic Society

基　　金：吉林省创新创业人才资助项目(2020010)。

摘　　要：立体光固化(SLA)作为碳化硅陶瓷材料3D打印的主流方法之一,具有广泛的应用前景。本文针对立体光固化成型的碳化硅素坯,进行了脱脂与反应熔渗试验,通过烧结过程中密度、强度、收缩率、微观结构的变化,研究了立体光固化成型碳化硅素坯的烧结特性。结果表明:脱脂后样品具有较低的烧结收缩率,特别是增材方向,为0.88%,脱脂后的坯体强度为0.26 MPa;光敏(UV)树脂的残留热解碳(PyC)呈网状结构连接碳化硅颗粒,热解碳局部出现断裂,同时样品沿打印层间出现微裂纹;反应熔渗后残留热解碳与硅反应生成β-SiC,连续相硅填充孔隙与层间微裂纹,样品体积密度为2.79 g/cm^(3),抗弯强度为183.99 MPa。Stereolithography(SLA),as one of the main methods of 3D printing of SiC ceramics materials,has a wide range of applications.In this paper,the experiments of debinding and reactive melt infiltration(RMI)were carried out on the SiC prepared by stereolithography.The sintering characteristics of the SiC were studied through the changes of density,strength,shrinkage,and microstructure.The results show that,the shrinkage of the sample is low after debinding,especially along the additive direction,which is only 0.88%.The strength of the sample after debinding is 0.26 MPa.The residual pyrocarbon(PyC)formed by the UV resin is connected with SiC particles in a network structure.The pyrocarbon locally breaks and microcracks appear along with the printed layers.The residual pyrocarbon reacts with silicon to form β-SiC after reactive infiltration and the silicon fills the pores and microcracks.The density of the sample is 2.79 g/cm^(3),and the bending strength is 183.99 MPa.

关 键 词：立体光固化 碳化硅 反应熔渗 3D打印 微观结构 反射镜 

分 类 号：TQ174[化学工程—陶瓷工业]