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Cu/W-Ni-Co/Ni多中間層的鎢/鋼擴(kuò)散連接
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國家自然科學(xué)基金（51075205）


Diffusion Bonding between Tungsten and Steel with Cu/W-Ni-Co/Ni Multi-Interlayer
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    摘要:

    采用銅箔/90W-5Ni-5Co（質(zhì)量分?jǐn)?shù)，%）混合粉末/鎳箔復(fù)合中間層，在加壓5 MPa、連接溫度1120 ℃、保溫60 min的工藝條件下，對純鎢（W）和0Cr13Al鋼進(jìn)行了連接。利用SEM、EDS、電子萬能試驗(yàn)機(jī)及水淬熱震實(shí)驗(yàn)等手段研究了接頭的微觀組織、成分分布、斷口特征、力學(xué)性能及抗熱震性能。結(jié)果表明，連接接頭由鎢母材、Cu-Ni-Co合金層、鎢基高密度合金層、鎳層、鋼母材5部分組成。接頭中的鎢基高密度合金層由90W-5Ni-5Co混合粉末固相燒結(jié)生成，其Ni-Co粘結(jié)相和鎢顆粒相冶金結(jié)合且分布均勻。鎢基高密度合金層與鎢母材以瞬間液相擴(kuò)散連接機(jī)制實(shí)現(xiàn)了良好結(jié)合。接頭剪切強(qiáng)度達(dá)到286 MPa，斷裂均發(fā)生在鎢基高密度合金層/鎳層結(jié)合區(qū)域，斷口形貌呈現(xiàn)為韌性斷裂。經(jīng)過60次700 ℃至室溫的水淬熱震測試，接頭無裂紋出現(xiàn)。

    Abstract:

    Bonding between tungsten and 0Cr13Al steel using a Cu/90W-5Ni-5Co powder mixtures/Ni multi-interlayer, was carried out in vacuum for 60 min at 1120 oC with a pressure of 5 MPa. The microstructures, composition distribution and fracture characteristics of the joints were studied by SEM and EDS. Joint properties were tested by shear experiments and thermal shock test. The results show that the joints comprise of tungsten/Cu-Ni-Co/tungsten heavy alloy/Ni/steel. Among them, the tungsten heavy alloy sub-layer, which is composed of uniformly distributed tungsten phase and Ni-Co matrix, is formed by solid phase sintering of 90W-5Ni-5Co powder mixtures. Sound bonding between tungsten and tungsten heavy alloy sub-layer are realized based on the transient liquid phase bonding mechanism. The average shear strength of 286 MPa has been obtained, and all the joints fracture at bonding zone of tungsten heavy alloy sub-layer and Ni sub-layer during shear testing. The results of the thermal shock tests indicate that all joints could withstand 60 cycles from 700 oC to room temperature in water.

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楊宗輝,沈以赴,初雅杰,徐振欽. Cu/W-Ni-Co/Ni多中間層的鎢/鋼擴(kuò)散連接[J].稀有金屬材料與工程,2015,44(3):708~712.[Yang Zonghui, Shen Yifu, Chu Yajie, Xu Zhenqin. Diffusion Bonding between Tungsten and Steel with Cu/W-Ni-Co/Ni Multi-Interlayer[J]. Rare Metal Materials and Engineering,2015,44(3):708~712.]
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  • 收稿日期:2014-03-18
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  • 在線發(fā)布日期: 2015-05-29
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