W含量对自蔓延离心熔铸TiB_2-TiC-(Ti,W)C陶瓷组织和性能的影响
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摘要
通过在(Ti+B_4C)体系中引入(WO_3+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TiB_2-TiC-(Ti,W)C复合陶瓷。XRD、FESEM和XRD结果显示:陶瓷基体主要由Ti B2、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TiB_2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,TiB_2-TiC-(Ti,W)C复合陶瓷的相对密度和维氏硬度呈上升趋势,而陶瓷的抗弯曲强度和断裂韧性先增大后减小,在W含量为65%时达到最大值,这是TiB_2作为唯一的增强相体积分数逐渐减少的结果。
By introducing(WO_3+Al) thermites into the(Ti+B_4C) combustion system and adjusting the proportion of the two systems, TiB_2-TiC-(Ti,W)C composite 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 TiB_2, TiC and(Ti, W)C. As W content increases, the volume fraction of(Ti, W)C increases, while the volume fraction of TiB_2 and TiC decrease, whose grains are refined and distributed uniformly. Mechanical properties tests show that relative density and Vickers hardness of the ceramics rise as the W content increases. However, flexural strength and fracture toughness of the ceramics first increase and then decrease, which achieve maxima when the W content is 65%. This is due to the decrease in volume fraction of TiB_2 platelet which is the unique reinforced phase of the TiB_2-TiC-(Ti, W)C composite ceramic.
By introducing(WO_3+Al) thermites into the(Ti+B_4C) combustion system and adjusting the proportion of the two systems, TiB_2-TiC-(Ti,W)C composite 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 TiB_2, TiC and(Ti, W)C. As W content increases, the volume fraction of(Ti, W)C increases, while the volume fraction of TiB_2 and TiC decrease, whose grains are refined and distributed uniformly. Mechanical properties tests show that relative density and Vickers hardness of the ceramics rise as the W content increases. However, flexural strength and fracture toughness of the ceramics first increase and then decrease, which achieve maxima when the W content is 65%. This is due to the decrease in volume fraction of TiB_2 platelet which is the unique reinforced phase of the TiB_2-TiC-(Ti, W)C composite ceramic.
引文
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[2]Pan Chuanzeng(潘传增),Zhao Zhongmin(赵忠民),Zhang Long(张龙)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2013,42(S1):358
[3]Li Jinfeng(李劲风),Zhang Zhao(张昭),Zhang Jianqing(张鉴清)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2002,31(1):64
[4]Vallauri D,Atias I C,Adrian A.J Eur Ceram Soc[J],2008,28(8):1697
[5]Zhao Z M,Zhang L,Song Y G et al.Scripta Materialia[J],2009,61:281
[6]Huang Xuegang(黄雪刚),Zhang Long(张龙),Zhao Zhongmin(赵忠民)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2011,40(S1):199
[7]Mossino P.Ceram Inter[J],2004,30:311
[8]Merzhanov A G.Ceram Inter[J],1995,21:377
[9]Dai Yongnian(戴永年).Phase Diagram of Binary Alloy System(二元合金相图)[M].Beijing:Science Press,2009:1250
[10]Rudy E.Journal of the Less Common Metals[J],1973,33(3):327