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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摘要为了解决碳化硼(B₄C)难以烧结致密化和韧性差的问题,以B₄C和氧化镧(La₂O₃)为原料,在2 000 ℃和30 MPa下快速热压烧结制备B₄C-LaB₆复合陶瓷,研究La₂O₃含量对B₄C-LaB₆复合陶瓷微观结构和力学性能的影响,分析LaB₆的增韧机制。结果表明：w(La₂O₃)=3%的B₄C-LaB₆复合陶瓷综合力学性能较好,其相对密度、维氏硬度、抗弯强度和断裂韧性分别为99.51%、36.56 GPa、547.43 MPa和4.18 MPa∙m^1/2。LaB₆可细化B₄C-LaB₆复合陶瓷晶粒,同时提高其相对密度和断裂韧性。LaB₆的增韧机制与裂纹偏转和晶粒裂解有关。

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	徐志伟
	彭可
	袁铁锤

关键词 ： B₄C-LaB₆复合陶瓷, 晶粒细化, 晶界, 相对密度, 增韧机制

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

收稿日期: 2023-10-26 出版日期: 2024-03-26

ZTFLH:

TB332

基金资助:国家自然科学基金资助项目(52272077); 中南大学中央高校基本科研业务费专项资金资助(1053320213869)

通讯作者: 袁铁锤,教授,博士。电话：13327132560;E-mail: tiechuiyuan@csu.edu.cn

引用本文:

徐志伟, 彭可, 袁铁锤. 快速热压烧结制备高性能B₄C-LaB₆复合陶瓷[J]. 粉末冶金材料科学与工程, 2024, 29(1): 35-44.
XU Zhiwei, PENG Ke, YUAN Tiechui. High-performance B₄C-LaB₆ composite ceramics fabricated via rapid hot press sintering. Materials Science and Engineering of Powder Metallurgy, 2024, 29(1): 35-44.

链接本文:

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

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