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硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (10): 3805-3813.DOI: 10.16552/j.cnki.issn1001-1625.2025.0521

• 陶瓷 • 上一篇    下一篇

B4C含量对非等摩尔五元硼化物陶瓷致密化及力学性能的影响

王坤, 邱帅航, 邹冀, 季伟, 王为民, 傅正义   

  1. 武汉理工大学材料复合新技术全国重点实验室,武汉 430070
  • 收稿日期:2025-05-24 修订日期:2025-06-05 出版日期:2025-10-15 发布日期:2025-11-03
  • 通信作者: 邹 冀,博士,研究员。E-mail:ji.zou@whut.edu.cn
  • 作者简介:王 坤(1999—),男,硕士研究生。主要从事高熵陶瓷的研究。E-mail:278861695@qq.com
  • 基金资助:
    国家重点研发计划(2021YFB3701400);湖北省自然科学基金项目(杰出青年学者2022CFA042)

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

WANG Kun, QIU Shuaihang, ZOU Ji, JI Wei, WANG Weimin, FU Zhengyi   

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
  • Received:2025-05-24 Revised:2025-06-05 Published:2025-10-15 Online:2025-11-03

摘要: 本文以B4C为烧结助剂,采用无压烧结工艺制备了(Ti0.1Zr0.35Hf0.35Nb0.1Ta0.1)B2复相陶瓷,并考察了添加不同含量B4C的样品在1 900~2 200 ℃烧结温度下的显微结构和力学性能。结果表明,B4C的引入可显著促进陶瓷的致密化,在2 100 ℃下,添加2%和5%(质量分数)B4C的陶瓷样品均接近全致密,在较低烧结温度(2 000~2 100 ℃)下提高了材料的硬度和断裂韧性。2 100 ℃烧结获得的添加5%B4C的复相陶瓷展现出较好力学性能,硬度达(21.49±1.17) GPa,断裂韧性为(3.12±0.11) MPa·m1/2。然而,当烧结温度升高至2 200 ℃时,B4C形成液相,造成材料致密度和力学性能下降。本研究为复杂组元陶瓷组分设计、烧结助剂调控及无压烧结致密化窗口的建立提供参考。

关键词: 二硼化物陶瓷, B4C, 非等摩尔, 无压烧结, 致密化, 力学性能

Abstract: In this paper, (Ti0.1Zr0.35Hf0.35Nb0.1Ta0.1)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·m1/2. 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

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