快速热压烧结制备高性能B<sub>4</sub>C-LaB<sub>6</sub>复合陶瓷

doi:10.19976/j.cnki.43-1448/TF.2023075

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Abstract In order to solve the problem that boron carbide (B₄C) is difficult for sintering densification and poor toughness, the B₄C-LaB₆ composite ceramics were fabricated via rapid hot press sintering at 2 000 ℃ and 30 MPa with B₄C and lanthana (La₂O₃) as raw materials. The effects of additive La₂O₃content on the microstructures and mechanical properties of B₄C-LaB₆ composite ceramics were investigated, and the toughening mechanism of LaB₆ was studied. The results show that the B₄C-LaB₆ composite ceramics with w(La₂O₃)=3% have better comprehensive mechanical properties, the relative density, Vickers hardness, bending strength, and fracture toughness reach 99.51%, 36.56 GPa, 547.43 MPa, and 4.18 MPa∙m^1/2, respectively. LaB₆ refines the grain, and improves the relative density and fracture toughness of the B₄C-LaB₆composite ceramics. The toughening mechanism of LaB₆ is related to crack deflection and grain cracking.

Key words： B₄C-LaB₆ composite ceramic grain refining crystal boundary relative density toughening mechanism

Received: 26 October 2023 Published: 26 March 2024

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	XU Zhiwei
	PENG Ke
	YUAN Tiechui

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XU Zhiwei,PENG Ke,YUAN Tiechui. High-performance B₄C-LaB₆ composite ceramics fabricated via rapid hot press sintering[J]. Materials Science and Engineering of Powder Metallurgy, 2024, 29(1): 35-44.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023075 OR http://pmbjb.csu.edu.cn/EN/Y2024/V29/I1/35

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