Effect of sintering temperature on microstructure and properties of silicon nitride ceramics by spark plasma sintering

被引：0
作者：
Liu J. [1 ]
Xie Z. [2 ]
Li Z. [1 ]
机构：
[1] University of Science and Technology, Anshan, 114051, Liaoning
[2] State Key Laboratory of New Ceramics and Fine Processing, Beijing
来源：
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2016年 / 44卷 / 03期
关键词：
Mechanical properties; Microstructure; Silicon nitride; Sintering temperature; Spark plasma sintering;
D O I：
10.14062/j.issn.0454-5648.2016.03.09
中图分类号：
学科分类号：
摘要：
The high-performance silicon nitride ceramics were prepared via spark plasma sintering (SPS) with submicron-sized powder of silicon nitride as a raw material and Al2O3-Y2O3 as a sintering aid. The phase constitution and microstructure of specimens were analyzed by X-ray diffraction and scanning electronic microscopy. The effect of sintering temperature on the microstructure and mechanical properties of silicon nitride ceramics were investigated. The results show that β-phase silicon nitride ceramic with a high density and good mechanical properties can be obtained at a lower sintering temperature by SPS. The density, flexural strength and fracture toughness of the samples improve with the increase of the sintering temperature. The flexural strength and fracture toughness of the samples sintered at 1 500 ℃ are 973.74 MPa and 8.23 MPa·m1/2, respectively. According to the phase composition and microstructure analysis, the β-phase content of silicon nitride ceramics is 98%. The elongated columnar silicon nitride grains are uniform and well-developed. The compact connection between the grains results in the less pores of grain boundaries. The abnormal growth of some grains produces the more microscopic pores, leading to that the flexural strength decreases as sintering temperature further incerases. © 2016, Chinese Ceramic Society. All right reserved.
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页码：403 / 407
页数：4
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