Effects of N2 pressure and Si particle size on mechanical properties of porous Si3N4 ceramics prepared via SHS. Issue 13 (October 2020)

• Record Type: Journal Article
• Authors: Zhang, Ye; Yao, Dongxu; Zuo, Kaihui; Xia, Yongfeng; Yin, Jinwei; Liang, Hanqin; Zeng, Yu-Ping
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 13(2020)
• Page Start: 4454
• Page End: 4461
• Publication Date: 2020-10
• Subjects: SHS -- Silicon nitride -- Porous ceramics -- Microstructures; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.05.038
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Porous silicon nitride ceramics with high flexural strength and high porosity were directly fabricated by self-propagating high temperature synthesis (SHS). The effects of N2 pressure and Si particle size on the phase composition, microstructure, and mechanical property were investigated. N2 influences not only the thermodynamics but also the kinetics of the SHS as initial reactant. Flexural strength ranged between 67 MPa and 134 MPa with increasing N2 pressure. On the other hand, flexural strength ranged from 213 MPa to 102 MPa with different Si particle sizes. This plays an important role on the final diameter and length of β-Si3 N4 grains and the formation mechanism of porous Si3 N4 ceramics.