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 Changrui WANG;Zhiyou LI;Wei TIAN;Yuxian LI;Lina TANG;Qilong PANG;Minghe CHEN

作者机构：National Key Laboratory of Science and Technology on Helicopter TransmissionNanjing University of Aeronautics and AstronauticsNanjing 210016China Ji’nan Technician CollegeJinan 250000China Shanghai Aerospace Equipments Manufacturer Co.Ltd.Shanghai 200245China College of Mechanical and Electrical EngineeringNanjing Forestry UniversityNanjing 210037China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2022年第35卷第5期

页      面：429-440页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

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)。 

主　　题：Composite materials Fracture Injection molding Microstructure Phase composition 

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.