Effect of in situ synthesized TiB whisker on microstructure and mechanical properties of carbon–carbon composite and TiBw/Ti–6Al–4V composite joint
Effect of in situ synthesized TiB whisker on microstructure and mechanical properties of carbon–carbon composite and TiBw/Ti–6Al–4V composite joint
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DOI：
10.1016/j.matdes.2011.04.028
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发表时间：
2011-09
影响因子：
8.4
通讯作者：
Tiesong Lin;Minxuan Yang;P. He;Chao-Fan Huang;F. Pan;Yudong Huang
中科院分区：
文献类型：
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作者：
Tiesong Lin;Minxuan Yang;P. He;Chao-Fan Huang;F. Pan;Yudong Huang
采用Cu-Ni + TiB 2复合钎料钎焊C-C复合材料和TiB晶须增强Ti-6Al-4V复合材料。TiB 2粉末与TiBw/Ti-6Al-4V复合材料中扩散的Ti发生反应，在钎焊层中形成TiB晶须。研究了TiB 2添加量、钎焊温度和保温时间对钎焊接头组织和剪切强度的影响。结果表明，原位合成的TiB晶须均匀分布在接头中，不仅起到了增强作用，而且降低了接头的残余热应力。对于不同的钎焊温度和保温时间，Cu-Ni合金钎焊接头的剪切强度均低于Cu-Ni + TiB 2合金钎焊接头。当钎焊温度为1223 K，钎焊时间为10 min时，Cu-Ni + TiB 2合金粉末钎焊接头的最大剪切强度为18.5 MPa，比Cu-Ni合金粉末钎焊接头的剪切强度提高了56%。
Carbon–carbon composite (C–C composite) and TiB whiskers reinforced Ti–6Al–4V composite (TiBw/Ti–6Al–4V composite) were brazed by Cu–Ni + TiB2composite filler. TiB2powders have reacted with Ti which diffused from TiBw/Ti–6Al–4V composite, leading to formation of TiB whiskers in the brazing layer. The effects of TiB2addition, brazing temperature, and holding time on microstructure and shear strength of the brazed joints were investigated. The results indicate that in situ synthesized TiB whiskers uniformly distributed in the joints, which not only provided reinforcing effects, but also lowered residual thermal stress of the joints. As for each brazing temperature or holding time, the joint shear strength brazed with Cu–Ni alloy was lower than that of the joints brazed with Cu–Ni + TiB2alloy powder. The maximum shear strengths of the joints brazed with Cu–Ni + TiB2alloy powder was 18.5 MPa with the brazing temperature of 1223 K for 10 min, which was 56% higher than that of the joints brazed with Cu–Ni alloy powder.