烧结工艺条件对放电等离子烧结制备的碳化硼陶瓷微观结构和力学性能的影响

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

作者信息

Liu Yingying, Ge Sheng, Huang Yihua, Huang Zhengren, Zhang Deku

机构信息

State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China.

College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China.

出版信息

Materials (Basel). 2021 Feb 26;14(5):1100. doi: 10.3390/ma14051100.

DOI:10.3390/ma14051100

PMID:33652926

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7956341/

Abstract

Boron carbide (BC) 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 BC ceramics, were comprehensively and systematically investigated. Hardness and fracture toughness of BC 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, 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.

摘要

在不使用任何烧结添加剂的情况下，通过放电等离子烧结在1600至2050℃的温度范围内合成了碳化硼（BC）陶瓷。全面且系统地研究了烧结工艺参数（如温度、保温时间、压力、加热速率和脉冲电流）以及原料粉末的粒径对BC陶瓷致密化行为和力学性能的影响。发现密度接近理论值的BC的硬度和断裂韧性分别为33.5±0.2 GPa和3.21±0.13 MPa·m。电子背散射衍射（EBSD）分析表明，由于保温时间和压力的增加，晶粒没有异常生长。陶瓷中存在的孪晶结构有利于其力学性能。