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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(英文),2018,47(6):1931~1935.[Chen Shuo,Zhang Long,Zhao Zhongmin,Lou Guangpu and 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.]
Effects of W content on microstructure and properties of TiB2-TiC-(Ti, W)Ccomposite ceramic prepared by SHS centrifugal casting
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Received:June 03, 2016  Revised:July 18, 2016
DOI:
Key words: TiB2-TiC-(Ti, W)C  composite ceramics  SHS centrifugal casting  mechanical properties  microstructure transformation
Foundation item:国家自然科学基金资助(项目号51072229)
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Chen Shuo,Zhang Long,Zhao Zhongmin,Lou Guangpu and Zhang Hao  
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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.