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梯度金屬陶瓷(TiC)pNi與Ti燃燒擴(kuò)散連接界面組織及力學(xué)性能
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國(guó)家自然科學(xué)基金（50975190，51101111）；山西省青年科學(xué)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工藝，借助中間層TiAl的燃燒反應(yīng)放熱，原位合成了梯度金屬陶瓷(TiC)pNi和金屬間化合物TiAl，并同步完成了(TiC)pNi/TiAl/Ti的擴(kuò)散連接，研究了在外加溫度場(chǎng)、電場(chǎng)和應(yīng)力場(chǎng)耦合作用下連接結(jié)構(gòu)的形成機(jī)制。利用FE-SEM、TEM和XRD等手段對(duì)各層及連接界面的微觀結(jié)構(gòu)和相組成，以及電場(chǎng)作用下各連接界面元素?cái)U(kuò)散特征進(jìn)行分析；采用顯微硬度壓痕法對(duì)連接界面的韌性進(jìn)行分析；采用剪切法、冷淬法和有限元法對(duì)界面結(jié)合強(qiáng)度和殘余應(yīng)力分布進(jìn)行分析計(jì)算。結(jié)果表明，各燃燒層均發(fā)生充分反應(yīng)并形成了良好的冶金結(jié)合，連接界面處存在強(qiáng)烈的元素交互擴(kuò)散；連接界面具有較強(qiáng)的抗剝離和抗剪切強(qiáng)度，(TiC)PNi/TiAl界面為接頭的薄弱環(huán)節(jié)。

    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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陳少平,董 鳳,孟慶森,樊文浩.梯度金屬陶瓷(TiC)pNi與Ti燃燒擴(kuò)散連接界面組織及力學(xué)性能[J].稀有金屬材料與工程,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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