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梯度金属陶瓷(TiC)pNi与Ti燃烧扩散连接界面组织及力学性能
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国家自然科学基金(50975190,51101111);山西省青年科学研究基金(2011021022-3)


Microstructure and Mechanical Properties of Interface between Gradient Cermets (TiC)pNi and Ti by Combustion Diffusion Bonding
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    摘要:

    采用MA-FAPAS工艺,借助中间层TiAl的燃烧反应放热,原位合成了梯度金属陶瓷(TiC)pNi和金属间化合物TiAl,并同步完成了(TiC)pNi/TiAl/Ti的扩散连接,研究了在外加温度场、电场和应力场耦合作用下连接结构的形成机制。利用FE-SEM、TEM和XRD等手段对各层及连接界面的微观结构和相组成,以及电场作用下各连接界面元素扩散特征进行分析;采用显微硬度压痕法对连接界面的韧性进行分析;采用剪切法、冷淬法和有限元法对界面结合强度和残余应力分布进行分析计算。结果表明,各燃烧层均发生充分反应并形成了良好的冶金结合,连接界面处存在强烈的元素交互扩散;连接界面具有较强的抗剥离和抗剪切强度,(TiC)PNi/TiAl界面为接头的薄弱环节。

    Abstract:

    Employing MA-FAPAS and using TiAl as exothermal mediate layer, gradient cermets (TiC)pNi and TiAl were synthesized from element reactants in one step as well as the structure of (TiC)pNi/TiAl/Ti was accomplished. The effect of temperature, current and pressure on the process was analyzed. Microstructure observation and composition determination were made by FE-SEM, TEM and XRD. It reveals that well formed and crack-free bond were achieved with strong mutual diffusion of elements across both interfaces. Fracture toughness, thermal shock resistance and bonding strength were evaluated and residual stress distribution was simulated by finite element method. It indicates that the interface between TiAl/Ti has higher thermal resistance and shear resistance than that between (TiC)PNi/TiAl.

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陈少平,董 凤,孟庆森,樊文浩.梯度金属陶瓷(TiC)pNi与Ti燃烧扩散连接界面组织及力学性能[J].稀有金属材料与工程,2013,42(2):302~306.[Chen Shaoping, Dong Feng, Meng Qingsen, Fan Wenhao. Microstructure and Mechanical Properties of Interface between Gradient Cermets (TiC)pNi and Ti by Combustion Diffusion Bonding[J]. Rare Metal Materials and Engineering,2013,42(2):302~306.]
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  • 收稿日期:2012-02-15
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