首页|Effect of Hexagonal BN on the Microstructure and Mechanical Properties of Pressureless Sintered Porous Si_3N_4 Ceramics

Effect of Hexagonal BN on the Microstructure and Mechanical Properties of Pressureless Sintered Porous Si_3N_4 Ceramics

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  • Trans Tech Publications Ltd
Porous silicon nitride ceramics with various amounts (25, 35, and 45 vol %) of hexagonal boron nitride (h-BN) were fabricated at 1800℃ for 2h by the pressureless sintering process. With FESEM and TEM, the effects of h-BN on the microstructure and mechanical properties of Si_3N_4 ceramics were investigated. Results of the microstructure and mechanical properties of Si_3N_4/BN composites showed that the growth of the elongated β-Si_3N_4 were hindered by h-BN additive, which resulted in the decrease of fracture toughness of Si_3N_4/BN ceramics with increasing h-BN content. The morphologies of the fracture surfaces by FESEM revealed the fracture mode for Si_3N_4/BN composites to be intergranular. However, phase analysis by XRD indicated that the effect of h-BN on the α- to β-Si_3N_4 phase transformation of Si_3N_4/BN composites was negligible.

silicon nitridehexagonal boron nitridepressureless sinteringmechanical properties

Yongfeng Li、Ping Liu、Xiangdong Wang、Haiyun Jin、Guanjun Qiao

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State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049 China

School of Science, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049 China

School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049 China

2010

10.4028/www.scientific.net/KEM.434-435.697

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.434/435
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