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W含量对自蔓延离心熔铸TiB2-TiC-(Ti,W)C陶瓷组织性能的影响
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军械工程学院,军械工程学院,军械工程学院,军械工程学院,63981部队

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国家自然科学基金资助(项目号51072229)


Effects of W content on microstructure and properties of TiB2-TiC-(Ti, W)Ccomposite ceramic prepared by SHS centrifugal casting
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Ordnance Engineering College,Ordnance Engineering College,Ordnance Engineering College,Ordnance Engineering College,Unit No. 63981

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    摘要:

    通过在(Ti+B4C)体系中引入(WO3+Al)燃烧体系,进而调整两体系的比例,采用自蔓延离心熔铸工艺成功制备出W系列含量的TiB2-TiC-(Ti, W)C复合陶瓷。XRD、FESEM和XRD结果显示:陶瓷基体主要由TiB2、TiC和(Ti, W)C固溶体组成,且随着W含量的增加,(Ti, W)C固溶体体积分数增加,而TiB2和TiC体积分数减少且晶粒逐渐细化,同时,组织分布趋于均匀。力学性能测试表明,随着W含量的增加,TiB2-TiC-(Ti, W)C复合陶瓷的相对密度和维氏硬度呈上升趋势,而陶瓷的弯曲强度和断裂韧性先增大后减小,在W含量65%时达到最大值,这是TiB2作为唯一的增强相体积分数逐渐减少的结果。

    Abstract:

    By introducing (WO3+Al) thermites into the (Ti+B4C) combustion system and adjusting the proportion of two systems, TiB2-TiC-(Ti, W)Ccomposite ceramics with different W mass fraction were prepared by SHS centrifugal casting. XRD, FESEM and EDS results show that the ceramic matrix is mainly composed of TiB2, TiC and (Ti, W)C. As W content increases, volume fraction of (Ti, W)C increases, and volume fraction of TiB2 and TiC decrease. Meanwhile, the grains are fined and distributed uniformly. Mechanical properties tests show that relative density and Vickers hardness of the ceramics are on the rise as W content increases, while, flexural strength and fracture toughness of the ceramics firstly increase and then decrease, and achieve maximum when W content is 65%. This is due to the decrease in volume fraction of TiB2 platelet which is the only reinforced phase of the TiB2-TiC-(Ti, W)Ccomposite ceramic.

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陈 硕,张 龙,赵忠民,娄光普,张 昊. W含量对自蔓延离心熔铸TiB2-TiC-(Ti, W)C陶瓷组织性能的影响[J].稀有金属材料与工程,2018,47(6):1931~1935.[Chen Shuo, Zhang Long, Zhao Zhongmin, Lou Guangpu, Zhang Hao. Effects of W content on microstructure and properties of TiB2-TiC-(Ti, W)Ccomposite ceramic prepared by SHS centrifugal casting[J]. Rare Metal Materials and Engineering,2018,47(6):1931~1935.]
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  • 收稿日期:2016-06-03
  • 最后修改日期:2016-07-18
  • 录用日期:2016-08-18
  • 在线发布日期: 2018-09-06
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