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擴(kuò)散連接Ti2AlNb/GH4169反應(yīng)動(dòng)力學(xué)研究
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凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室（西北工業(yè)大學(xué)）自主研究課題資助（31-TP-2009；43-QP-2009）


Study on Reaction Kinetics in Diffusion Bonding of Ti2AlNb and GH4169 with Nb+Ni Foils as Interlayer
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    摘要:

    研究了Ni+Nb為中間層對(duì)Ti2AlNb與GH4169真空擴(kuò)散連接反應(yīng)動(dòng)力學(xué)過程。結(jié)果發(fā)現(xiàn)：主要影響接頭剪切強(qiáng)度的Ni6Nb7層厚度存在一個(gè)最佳值，通過最小二乘法擬合得最佳厚度為3.36 μm。根據(jù)修正的有效生成熱理論和有效吉布斯自由能理論均預(yù)測(cè)Ni6Nb7為Ni-Nb固-固界面反應(yīng)的初生相，因此在連接過程中Ni6Nb7相的出現(xiàn)是不可避免的。由于Ni6Nb7的生長(zhǎng)速度低于Ni3Nb，因此可以通過優(yōu)化工藝參數(shù)來(lái)控制Ni6Nb7層的厚度來(lái)提高接頭的力學(xué)性能。通過Ni6Nb7層最佳厚度和生長(zhǎng)速率計(jì)算可得知最佳保溫時(shí)間約為49.5 min，實(shí)驗(yàn)結(jié)果表明，連接溫度1050 ℃，壓力20 MPa，保溫時(shí)間為49.5 min時(shí)，Ni6Nb7厚度為3.37 μm，接頭剪切強(qiáng)度達(dá)到468.2 MPa。

    Abstract:

    The process of reaction kinetics was investigated for vacuum diffusion bonding of Ti2AlNb and GH4169 by inserting metal foils of Ni+Nb as interlayer. The results show that there is an optimum thickness (about 3.36 μm) for the reaction layer Ni6Nb7, which is the main factor that influences the joint’s shear strength. The modified effective heat of formation (MEHF) theory and the effective Gibbs free energy theory were applied to predict that Ni6Nb7 is the primary phase formed during Ni-Nb interface reaction, i.e., Ni6Nb7 phase inevitably forms during the bonding process. The growth rate of Ni6Nb7 layer is lower than that of Ni3Nb layer. Thus it is possible to control the thickness of Ni6Nb7 layer by optimizing the processing parameters so as to improve the mechanical properties of the joints. The optimized duration time for the samples bonded at 1050 oC under 20 MPa is 49.5 min. This condition issues experimental shear strength of the joint as 468.2 MPa.

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錢錦文,李京龍,熊江濤,張賦升,林 鑫.擴(kuò)散連接Ti2AlNb/GH4169反應(yīng)動(dòng)力學(xué)研究[J].稀有金屬材料與工程,2011,40(12):2106~2110.[Qian Jinwen, Li Jinglong, Xiong Jiangtao, Zhang Fusheng, Lin Xin. Study on Reaction Kinetics in Diffusion Bonding of Ti2AlNb and GH4169 with Nb+Ni Foils as Interlayer[J]. Rare Metal Materials and Engineering,2011,40(12):2106~2110.]
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  • 收稿日期:2010-12-11
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