热压烧结碳化硼陶瓷的显微组织和力学性能

doi:10.19976/j.cnki.43-1448/TF.2025084

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Abstract In this paper, boron carbide ceramics were prepared by hot press sintering method using boron carbide powders of different particle sizes as raw materials. The effects of the raw material powder particle size and sintering process parameters on the microstructure and mechanical properties of boron carbide ceramics were investigated using X-ray diffractometer, scanning electron microscope, microhardness tester, and universal mechanical testing machine. The results show that the porosity and grain size of boron carbide continuously decrease with the reduction of powder particle size, while the grain growth rate accelerates. The increase in sintering temperature, the enhancement of sintering pressure, and the extension of soaking time are conducive to promoting the densification of boron carbide ceramics. The mechanical properties of boron carbide ceramics depend on the porosity and grain size. As the porosity decreases from 13.49% to 0.31%, the microhardness increases from 15.1 GPa to 31.7 GPa, while the fracture toughness decreases from 3.04 MPa·m^1/2 to 2.07 MPa·m^1/2. As the average grain size increases from 1.47 μm to 150.51 μm, the microhardness decreases from 31.3 GPa to 28.9 GPa, while the fracture toughness decreases from 2.55 MPa·m^1/2 to 1.42 MPa·m^1/2.

Key words： B₄C hot press sintering microstructure relative density mechanical property

Received: 01 December 2025 Published: 07 May 2026

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	ZHOU Zhihui
	YUAN Tiechui
	ZHOU Xiangxing

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ZHOU Zhihui,YUAN Tiechui,ZHOU Xiangxing. Microstructure and mechanical properties of boron carbide ceramics prepared by hot press sintering process[J]. Materials Science and Engineering of Powder Metallurgy, 2026, 31(2): 136-145.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2025084 OR http://pmbjb.csu.edu.cn/EN/Y2026/V31/I2/136

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