Effect of B4C Content on Densification and Mechanical Properties of Non-Equimolar Quinary Boride Ceramics

doi:10.16552/j.cnki.issn1001-1625.2025.0521

Abstract

Abstract: In this paper, (Ti_0.1Zr_0.35Hf_0.35Nb_0.1Ta_0.1)B₂ composite ceramics were prepared by pressureless sintering process with B₄C as sintering aid. The microstructure and mechanical properties of samples sintered at 1 900~2 200 ℃ with different content of B₄C were investigated. The results show that the introduction of B₄C can significantly promote the densification of ceramics. At 2 100 ℃, ceramic samples with 2 % and 5 % (mass fraction) B₄C achieve near-complete densification, and the hardness and fracture toughness of materials are improved at lower sintering temperatures (2 000~2 100 ℃). The composite ceramics with 5% B₄C addition sintered at 2 100 ℃ show good mechanical properties, with a hardness of (21.49±1.17) GPa and a fracture toughness of (3.12±0.11) MPa·m^1/2. However, when the sintering temperature rises to 2 200 ℃, B₄C forms a liquid phase, resulting in a decrease in densification and mechanical properties of material. This study provides reference for the design of complex component ceramics composition, the regulation of sintering aid and the establishment of pressureless sintering densification window.

Key words: diboride ceramics, B₄C, non-equimolar, pressureless sintering, densification, mechanical property

CLC Number:

TQ174

WANG Kun, QIU Shuaihang, ZOU Ji, JI Wei, WANG Weimin, FU Zhengyi. Effect of B₄C Content on Densification and Mechanical Properties of Non-Equimolar Quinary Boride Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(10): 3805-3813.

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Effect of B₄C Content on Densification and Mechanical Properties of Non-Equimolar Quinary Boride Ceramics

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