热压制备SiC/Si3N4陶瓷复合材料的力学性能研究
Research on Mechanical Properties of SiC/Si3N4 Composites Prepared by Hot Pressing Sintering
解玉鹏 1周新龙1
作者信息
- 1. 吉林化工学院理学院,吉林吉林 132022
- 折叠
摘要
通过热压烧结制备SiC/Si3N4陶瓷复合材料,研究温度和压力对复合材料的力学性能和微观结构的影响.结果表明:(1)原料质量配比Si3N4:SiC:CaF2=6:4:1,在1 400 ℃、25 MPa烧结压力下材料的抗弯强度达到最大值为66.7 MPa,体积密度为2.2 g/cm3,气孔率达到29.01％.随着温度的上升,材料的性能逐渐下降.在1 400 ℃时主晶相仍为β-Si3N4且含有少量SiC.(2)相同的质量配比时,在1 400 ℃烧结温度和45 MPa的烧结压力下制备的复合材料的力学性能为77.4 MPa,体积密度达到2.3 g/cm3,气孔率达到27.09％.从SEM图中可以观察到随着烧结压力的不断升高,材料的致密度和力学性能逐渐提高.
Abstract
SIC/SI3N4 ceramic composites were prepared by hot pressing sintering and the effect of temperature and pressure on the mechanical properties and microstructure of the composites were studied.The results showed that:(1)With the mass ratio of Si3N4:SiC:CaF2=6:4:1,the bending strength of the material at 1 400 ℃ and 25 MPa reaches the maximum of 66.7 MPa,the bulk density is 2.2 g/cm3,and the porosity is 29.01％.As the temperature rises,the properties of the material gradually decline.At 1 400 ℃,the main crystalline phase is still[3-Si3N4 and contains a small amount of SiC.(2)Under the same mass ratio,sintering temperature of 1 400 ℃ and the sintering pressure of 45 MPa,the mechanical properties of the composite can reach 77.4 MPa,the bulk density can reach 2.3 g/cm3,and the porosity can reach 27.09％.It can be observed from the SEM diagram that the density and mechanical properties of the material gradually increase with the increasing of sintering pressure.
关键词
烧结温度/烧结压力/致密度/力学性能Key words
sintering temperature/sintering pressure/density/mechanical property引用本文复制引用
基金项目
吉林省教育厅科研项目(JJKH20190832KJ)
吉林市科技创新发展计划(201831777)
出版年
2024
NETL
NSTL
万方数据