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人工晶体学报 ›› 2022, Vol. 51 ›› Issue (4): 716-722.

• 研究论文 • 上一篇    下一篇

TiB2、CNT双相增韧碳化硼复合陶瓷及其性能研究

许森1, 林文松1, 张虹2, 石健强2, 方宁象2   

  1. 1.上海工程技术大学材料工程学院,上海 201620;
    2.浙江立泰复合材料股份有限公司,湖州 313219
  • 收稿日期:2021-12-03 出版日期:2022-04-15 发布日期:2022-05-16
  • 通讯作者: 林文松,博士,教授。E-mail:wslin@sues.edu.cn
  • 作者简介:许森(1997—),男,河南省人,硕士研究生。E-mail:xs_sanmu@126.com
  • 基金资助:
    装备预研项目(41422010903)

Preparation and Characterization of TiB2 and CNT Dual-Phases Toughened B4C Ceramic Composites

XU Sen1, LIN Wensong1, ZHANG Hong2, SHI Jianqiang2, FANG Ningxiang2   

  1. 1. College of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;
    2. Zhejiang Light-Tough Composite Materials Co., Ltd., Huzhou 313219, China
  • Received:2021-12-03 Online:2022-04-15 Published:2022-05-16

摘要: 在1 500 ℃的真空条件下,通过液相渗硅法(liquid silicon infiltration, LSI)制备了碳化硼/二硼化钛-碳纳米管(B4C-TiB2-CNT)陶瓷复合材料,对其成分、形貌、性能和增韧机理进行了分析表征和研究。结果表明:复合材料的主要组成相为B12(C, Si, B)3、SiC和Si。二硼化钛和碳纳米管显著提高了液相渗硅烧结碳化硼陶瓷的力学性能,在TiB2和CNT的添加量分别为10%和0.4%时,复合陶瓷的弯曲强度和断裂韧性达到了(390±18) MPa和(5.38±0.38) MPa·m1/2,分别比B4C陶瓷高了31%和53%。本文的研究从片状SiC颗粒和CNT的拔出、TiB2的颗粒增韧以及裂纹的偏转等方面解释了B4C-TiB2-CNT复合材料的增韧机理。

关键词: 碳化硼, 液相渗硅法, 双相增韧陶瓷, 二硼化钛, 碳纳米管, 陶瓷复合材料

Abstract: B4C-TiB2-CNT ceramic composites were fabricated by the liquid silicon infiltration (LSI) sintering at 1 500 ℃ in vacuum. The compositions, morphologies, mechanical properties and toughening mechanism of the fabricated composites were investigated. The results show that the main constituent phases of the composites are B12(C, Si, B)3, SiC and Si. The additions of TiB2 and CNT significantly improve the mechanical properties of liquid-phase silicon sintered B4C ceramics. The flexural strength and fracture toughness of the composite ceramics reach (390±18) MPa and (5.38±0.38) MPa·m1/2 with TiB2 and CNT additions of 10% and 0.4% respectively, which are 31% and 53% higher than pure B4C caremics. The toughening mechanisms of B4C-TiB2-CNT ceramic composites are explained by the pullout of plate-like SiC particles and CNT, the particle toughening of TiB2 and the deflection of cracks.

Key words: boron carbide, liquid silicon infiltration, dual-phases toughened ceramics, TiB2, CNT, ceramic composite

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