摘要
以碳化硅、碳化硼微粉为原料,酚醛树脂为粘结剂,用固相烧结法制备了高温性能优异的SiC/B4C复合陶瓷,研究了保温温度对SiC/B4C复合陶瓷力学性能及微观形貌的影响。研究结果表明:2150℃保温45 min可制备出相对密度高达96.60%且综合性能优异的SiC/B4C复合陶瓷,其维氏硬度为26.5 GPa,断裂韧性为4.04 MPa·m^1/2,抗弯强度为345 MPa;B4C晶粒周围被SiC呈板状结构包裹,少量B2O3存在于晶界处;当温度高于2150℃时,出现整体排列的片层状SiC,SiC由6H-SiC向4H-SiC转变。
SiC/B4C composite ceramics with excellent high-temperature properties were prepared by solid-phase sintering with silicon carbide and boron carbide micropowder as raw materials and phenolic resin as binder.The effects of insulation temperature on mechanical properties and micromorphology of SiC/B4C composite ceramics were studied.The results show that SiC/B4C composite ceramics with a relative density of 96.60%and excellent comprehensive performance can be prepared at 2150℃for 45 min,with a vickers hardness of 26.5 GPa,a fracture toughness of 4.04 MPa·m^1/2 and a flexural strength of 345 MPa.B4C grains are surrounded by SiC of plate-like structure,and a small amount of B2O3 exist at grain boundaries.When the temperature is higher than 2150℃,the monolithic lamellar SiC appear,SiC transforms from 6H-SiC to 4H-SiC.
作者
樊子民
罗娟
王晓刚
FAN Zimin;LUO Juan;WANG Xiaogang(College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China;Shaanxi Eegineering Research Center of Energy Saving and Polygeneration in Silicon and Magnesium Industry, Xi’an 710054, China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第3期932-936,共5页
Bulletin of the Chinese Ceramic Society
基金
陕西省科技统筹创新工程计划项目(2016KTCQ01-97)
西安市高校人才服务企业项目(2019217714GXRC013CG014-GXYD13)。
关键词
SiC/B4C复合陶瓷
保温温度
固相烧结
力学性能
SiC/B4C composite ceramic
insulation temperature
solid-phase sintering
mechanical property
作者简介
樊子民(1977-),男,博士,副教授,主要从事先进陶瓷及复合材料的研究,E-mail:fanzimin@126.com。
