添加Al-Mg-Sc-Zr合金对热压烧结碳化硼组织及性能的影响

doi:10.19976/j.cnki.43-1448/TF.2023071

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Abstract B₄C composite ceramics were prepared by hot press sintering process with pure B₄C powder and atomized Al-Mg-Sc-Zr alloy powder as raw materials mixed by ball milling method. The effects of sintering temperature and the addition of Al-Mg-Sc-Zr alloy on the microstructure, hardness, bending strength, and fracture toughness of the ceramics were investigated. The results show that Al-Mg-Sc-Zr alloy transforms into liquid phase at high temperature, and reacts with free C and B₄C during sintering, which promotes sintering of ceramics and reduces porosity. With the increase of sintering temperature, the relative density of B₄C composite ceramics increases, which can reach 99.6% when sintering at 2 100 ℃. The addition of Al-Mg-Sc-Zr alloy improves the mechanical properties of B₄C composite ceramics, the hardness (HV), bending strength, and fracture toughness of the ceramics sintered at 2 100 ℃ increase to 3 859, (423.7±12.4) MPa, and 4.45 MPa·m^1/2, respectively.

Key words： B₄C hot press sintering Al-Mg-Sc-Zr alloy microstructure mechanical property

Received: 14 September 2023 Published: 23 January 2024

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	XU Xuejun
	XU Zhiwei
	YUAN Tiechui
	ZHOU Xiangxing

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XU Xuejun,XU Zhiwei,YUAN Tiechui, et al. Effects of adding Al-Mg-Sc-Zr alloy on microstructure and properties of boron carbide prepared by hot press sintering[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(6): 587-595.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023071 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I6/587

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