@article{MAN2023, 
author = {Yanjin MAN and Weiwei WANG and Yingying WANG and Sheng LIU and Xiaodong WANG and Zhuoqun HAN and Tao SONG and Ling LI},
title = {Effect of Pressureless Sintering and Gas Pressure Sintering on Properties of Silicon Nitride Ceramics},
year = {2023},
journal = {Journal of Ceramics},
volume = {44},
number = {6},
pages = {1183-1189},
keywords = {silicon nitride, pressureless sintering, gas pressure sintering, flexural strength, oxidation},
url = {https://www.sciopen.com/article/10.13957/j.cnki.tcxb.2023.06.014},
doi = {10.13957/j.cnki.tcxb.2023.06.014},
abstract = {Using silicon nitride powder as the main raw material to prepare silicon nitride ceramics by using pressureless sintering and gas pressure sintering. Effects of the two methods on the density, hardness, strength and toughness of the silicon nitride ceramics were studied. Oxidation resistance and surface morphology of the silicon nitride ceramics were examined at 1300 ℃ for 5 h. It is found that mechanical properties of the silicon nitride ceramics prepared by using the two methods were similar. However, the properties of the ceramics prepared by using the gas pressure sintering were relatively stable and had higher fracture toughness, with an average value of 12.6 MPa·m1/2. Surface of the Si3N4 was oxidized to glass phase SiO2 with obvious cracks at 1300 ℃ for 5 h. Compared with pressureless sintered one, the gas pressure sintered sample showed stronger oxidation resistance and high temperature strength. The average oxidation gain rate and flexural strength were 0.014% and 304.2 MPa, respectively.}
}