Micro powder injection molding of boron carbide components with SiC-Al_(2)O_(3)-Y_(2)O_(3)sintering additives  

作　　者：Changrui WANG Zhiyou LI Wei TIAN Yuxian LI Lina TANG Qilong PANG Minghe CHEN 

机构地区：[1]National Key Laboratory of Science and Technology on Helicopter Transmission,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]Ji’nan Technician College,Jinan 250000,China [3]Shanghai Aerospace Equipments Manufacturer Co.Ltd.,Shanghai 200245,China [4]College of Mechanical and Electrical Engineering,Nanjing Forestry University,Nanjing 210037,China

出　　处：《Chinese Journal of Aeronautics》2022年第5期429-440,共12页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52075250);the China Postdoctoral Science Foundation(No.2020M683376);the National Key Laboratory of Science and Technology on Helicopter Transmission(No.HTL-O-19G09)。

摘　　要：Sintering additives and micro-powder injection molding offer an effective method to densify boron carbide(B_(4)C)and make B_(4)C components with complex shapes.By adjusting the proportion of three kinds of powders(SiC,Al_(2)O_(3)and Y_(2)O_(3)),four kinds of sintering additives were prepared.The feedstock uniformity,debinding behavior,phase composition and microstructure of micro injection molded B_(4)C components with different sintering additives were studied.The results showed that the defects such as lattice distortion and vacancy were introduced into ball milling,which increase the surface energy and benefit subsequent sintering densification.The feedstock had good uniformity and rheology that met the requirements of micro powder injection molding.After debinding,B_(4)C components had enough strength and showed certain sintering characteristics.The addition of sintering additives was beneficial to densification and sintering temperature reduction.The addition of sintering additives formed a second phase in the B_(4)C crystal and at the grain boundary of B_(4)C crystal,which changed the fracture mode from transgranular fracture to mixed fracture mechanism with transgranular fracture.

关 键 词：Composite materials FRACTURE Injection molding MICROSTRUCTURE Phase composition 

分 类 号：V25[一般工业技术—材料科学与工程]