Fabrication and Characterization of Barium Aluminum Silicate-Silicon Nitride Composites
The barium aluminum silicate-silicon nitride (BAS-Si3N4) matrix-ceramic composite was fabricated using pressureless sintering, at temperatures ranging from 1720℃, which is below the melting point of BAS, to 1850℃. The effect of processing conditions on sinterability, crystalline structure, microstructure and mechanical properties was evaluated. It was demonstrated the BAS glass-ceramic served as an effective liquid-phase-sintering aid, to attain high densities and completed the α-Si3N4-β-Si3N4 phase transformation, and remained as a structural matrix that was reinforced by the rod-like β-Si3N4 grains. Si3N4 grains nucleated and grow in random directions in an almost completely crystallized matrix of hexacelsian BAS. High flexural strength (665±40 MPa) and fracture toughness (7.74 MPa·m1/2) could be obtained from 30wt%BAS-70wt%Si3N4 samples that have been sintered at 1800℃ for 120 rain with a fine-grained microstructure.
Si3N4 Barium aluminum silicate Pressureless sintering Microstructure
Bo Wang Rui Guo Jiqiang Gao Jianfeng Yang
State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xian 710049,P.R.China
国际会议
10th International Symposium on Eco-Materials Processing and Design(第10届国际生态材料加工与设计研讨会)
西安
英文
447-450
2009-01-13（万方平台首次上网日期，不代表论文的发表时间）