真空浸渍对增材制造SiC陶瓷组织和性能的影响  

Effect of vacuum impregnation on microstructure andproperties of SiC ceramics by additive manufacturing

作　　者：冯浩 孙策 刘启明[1] 章嵩[2] 韩潇[3] 涂溶[2] 李娇 杜艳迎[5] 杨丽霞 刘凯[1,7] FENG Hao;SUN Ce;LIU Qiming;ZHANG Song;HAN Xiao;TU Rong;LI Jiao;DU Yanyin;YANG Lixia;LIU Kai(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;School of Art,Hubei University of Education,Wuhan 430070,China;School of Logistics Engineering,Wuhan University of Technology,Wuhan 430070,China;College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,Chian;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070 [3]北京空间机电研究所,北京100094 [4]湖北第二师范学院艺术学院,湖北武汉430070 [5]武汉理工大学物流工程学院,湖北武汉430070 [6]南京航空航天大学材料科学与工程学院,江苏南京211106 [7]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070

出　　处：《广西大学学报（自然科学版）》2023年第6期1446-1455,共10页Journal of Guangxi University（Natural Science Edition）

基　　金：国家重点研发计划青年科学家项目(2021YFB3703100);国家自然科学基金项目(52202066);装备预研教育部联合基金项目(8091B032105)。

摘　　要：为了获得高性能SiC陶瓷复杂构件,建立了碳纤维增强SiC陶瓷材料的激光增材制造及真空浸渍后处理方法,研究了短切碳纤维酚醛树脂复合粉末材料的设计制备规律及激光增材成形方法,探讨了真空浸渍工艺对激光增材成形SiC陶瓷坯体的微观组织及力学性能的影响。研究表明,随着浸渍次数的增加,SiC陶瓷的体积密度和力学性能先上升后降低。当真空浸渍2次时,树脂残碳密度达0.39 g/cm^(3),反应熔渗后碳化硅体积分数达到最大值(71.4%),材料性能达到最优,相较于未真空浸渍处理的增材制造SiC陶瓷,体积密度提高了13%(2.87 g/cm^(3)),弯曲强度提高了141%(251.8 MPa),断裂韧性提高了41%(3.22 MPa/m^( 1/2))。To obtain high-performance SiC ceramic components with complex structure,a vacuum impregnation post-treatment method for laser additive manufacturing of carbon fiber reinforced SiC ceramic materials was developed.The design and preparation of short carbon fiber phenol formaldehyde composite powder and laser additive manufacturing methods were studied,and the effects of vacuum impregnation process on the microstructure and mechanical properties of green bodies fabricated by laser additive manufacturing were investigated.The research shows that the bulk density and mechanical properties of SiC ceramics increase first and then decrease with the increased of impregnation times.After twice impregnation process,the resin residual carbon density of the green body reaches 0.39 g/cm^(3),the volume fraction of SiC reached the maximum 71.4%after reactive melt infiltration.Compared with the additive manufacturing SiC ceramics without vacuum impregnation,the bulk density improves by 13%(2.87 g/cm^(3)),the bending strength improves by 141%(251.8 MPa)and the fracture toughness increases by 41%(3.22 MPa/m^(1/2)).

关 键 词：激光增材制造 反应熔渗 SIC陶瓷 真空浸渍工艺 

分 类 号：TB321[一般工业技术—材料科学与工程]