摘要
Al/SiC是SiC基复合材料,具有优异的力学性能和热学性能,在大功率电子器件、5G基站关键冷却组件、电动汽车、高速刹车片、空间探测器操作装置等相关领域具有不可替代的作用。传统制备工艺的局限性使得近净成形的无压浸渗法成为制备Al/SiC复合材料的一种较好的方法。得到高质量的碳化硅(SiC)陶瓷素坯是熔渗技术的先决条件,选区激光烧结技术是获得高质量陶瓷素坯的一种新方法。该方法具有快速、高效的优点,无需模具即可成型制备大规模、复杂形状部件。本研究以热塑性酚醛树脂为黏结剂,利用机械混合与喷雾造粒的方法制备了复合粉体,采用选区激光烧结技术制备SiC素坯,制备了黏结剂体积分数低至15%的样品,并对其力学性能和微观结构进行表征。当树脂含量增大到体积分数25%时, SiC坯体的强度增量为702.1%。对于喷雾造粒粉体制备的样品而言,喷雾干粉的多孔结构使得SiC生坯的孔隙率较高(71.18%),导致生坯强度下降。
Belonging to the family of SiC-based composites,Al/SiC has excellent mechanical and thermal properties,making it irreplaceable in high-power electronic devices,key cooling components of 5 G base station,electric vehicles,high-speed brake pads,space probe operation devices,and other related fields featured by high technologies.The melt infiltration method,which can achieve near-net forming,has been recognized to be a favorable method for preparing Al/Si C composites to overcome the disadvantages of traditional processing.How to obtain a high-quality silicon carbide(Si C) ceramic green body is a key for the perfect melt infiltration method.Selective laser sintering(SLS) technology provides a new opportunity for a top grade ceramic forming process,which is rapid and efficient in realizing large-scale and complicated-shape without cast molding.Here,the Si C green body was obtained by SLS technique with thermoplastic phenolic resin as binder and its content lower than 15%(in volume) for the subsequent procedure to fabricate composite materials.However,low binder content results in low flexural strength.As the resin content increases to 25%(in volume),the strength of the Si C green body reaches 3.77 MPa with a strength increment of 702.1% for the SLS Si C green body.Spray drying was applied to form more spherical powder.Nevertheless,the porosity of the Si C green body is still high(71.18%),due to porous microstructure remaining in spray-dried powder,which leads to deteriorated strength of the green body.
作者
黄龙之
殷杰
陈晓
王新广
刘学建
黄政仁
HUANG Longzhi;YIN Jie;CHEN Xiao;WANG Xinguang;LIU Xuejian;HUANG Zhengren(Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100864,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China)
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第3期347-352,共6页
Journal of Inorganic Materials
基金
National Natural Science Foundation of China (52073299,52172077,51602325,91960102)
Youth Innovation Promotion Association
Chinese Academy of Sciences (2018289)。
