Mechanical Properties and Microstructure of Silicon Nitride Ceramics by Pressureless Sintering

Abstract

Abstract: The mechanical properties and microstructure of silicon nitride ceramics with MgO-Al₂O₃-SiO₂ as additives produced by pressless sintering
were investigated by XRD, SEM, TEM, EDS, and HRTEM. The relationship among preparation processing, microstructure, and mechanical properties was
emphatically discussed. Intensifying blend by planetary blender, silicon nitride ceramics sintered at 1780℃ for 3h has an uniform
microstructure with bigger aspect ratio of elongated grains (diameter in 0.3～0.8μm, length in 3～6μm, aspect ratio in 7～10),
flexure strength of 1.06GPa, HRA hardness of 92, H_v hardness of 14.2GPa, and fracture toughness of 6.6 MPa·m^0.5.

Key words: silicon nitride, pressless sintering, mechanical properties, microstructure

CLC Number:

TQ174

LIU Xue-Jian,HUANG Zhi-Yong,HUANG Li-Ping,ZHANG Pei-Zhi,CHEN Xiao-Yang. Mechanical Properties and Microstructure of Silicon Nitride Ceramics by Pressureless Sintering[J]. Journal of Inorganic Materials.

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Mechanical Properties and Microstructure of Silicon Nitride Ceramics by Pressureless Sintering

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