Influence of Sintering Process Conditions on Microstructural and Mechanical Properties of Boron Carbide Ceramics Synthesized by Spark Plasma Sintering

Materials

Deku Zhang¹  Sheng Ge²  Zhengren Huang²  Yingying Liu²  Yihua Huang² 

[1] School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China;

关键词: spark plasma sintering;    B₄C ceramics;    sintering conditions;    microstructure;    mechanical properties;   

DOI  :  10.3390/ma14051100

来源: DOAJ

【 摘 要 】

Boron carbide (B₄C) ceramics were synthesized by spark plasma sintering at a temperature between 1600 and 2050 °C without employing any sintering additives. The effect of sintering process parameters, such as temperature, holding time, pressure, hearting rate, and pulsed electric current, and the particle size of the raw powder on the densification behavior and mechanical properties of B₄C ceramics, were comprehensively and systematically investigated. Hardness and fracture toughness of B₄C that has a density close to the theoretical value were found to be 33.5 ± 0.2 GPa and 3.21 ± 0.13 MPa·m^1/2, respectively. Electron backscatter diffraction (EBSD) analysis revealed no abnormal growth of grains due to an increase in holding time and pressure. Twin structures present in ceramics are beneficial for their mechanical performance.

【 授权许可】

Unknown