Interfacial reaction and microstructural evolution of Ag-Cu braze on BaCo0.7Fe0.2Nb0.1O3-δ at high temperature in air
Interfacial reaction and microstructural evolution of Ag-Cu braze on BaCo0.7Fe0.2Nb0.1O3-δ at high temperature in air
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DOI：
10.1016/j.ceramint.2016.10.012
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发表时间：
2017
影响因子：
5.2
通讯作者：
Yuwen Zhang;Z. Lili;Wei Guo;Tingwei Liu;Chengzhang Wu;W. Ding;Xionggang Lu
中科院分区：
文献类型：
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作者：
Yuwen Zhang;Z. Lili;Wei Guo;Tingwei Liu;Chengzhang Wu;W. Ding;Xionggang Lu
基于反应空气钎焊技术，研究了BaCo0.7Fe0.2Nb0.1O3-δ(BCFNO)薄膜在空气中Ag-6.6mol%Cu润湿的界面反应及微观结构的形成。界面组织分析表明，在高温下，Ag-Cu合金在空气中转变为Ag-Cu-O钎料，液态钎料沿晶界向BCFNO基体渗透。X射线衍射仪证实，液态钎料中的铜氧与BCFNO反应生成了CoCuO2和Ba2Cu3O5+x。由于界面反应产物的迁移和表面张力的垂直分量的响应，在三重线处迅速形成了脊状结构。在铺展前沿的快速界面反应和隆起实际上阻碍了液态钎料的铺展，而不是在铺展过程中形成和驱动更光滑、无障碍的连续反应相。由于界面反应产物在摩擦线附近形成的脊状结构的演化，钎料与BCFNO基片之间的宏观接触角较小。
Based reactive air brazing technique, interfacial reaction and microstructure formation of Ag-6.6 mol% Cu wetting on BaCo0.7Fe0.2Nb0.1O3-δ(BCFNO) membrane in air were investigated. The interfacial microstructural analysis revealed that at high temperature Ag-Cu alloy transformed into Ag-Cu-O braze in air and the liquid braze penetrated into BCFNO matrix along the grain boundaries. Cu-O in the liquid braze reacted with BCFNO to form CoCuO2and Ba2Cu3O5+xconfirmed by XRD. Ridge formed quickly at the triple line as a result of the migration of the interfacial reaction products and in response to the vertical component of force from surface tension. The rapid interfacial reaction and ridging at the spreading front actually stalled the spreading of the liquid braze, rather than a continuous layer of smoother, barrier-free reaction phase forming and driving accompanied spreading. Low macroscopic contact angles between the braze and BCFNO substrate were observed due to the evolution of the ridge composed of the interfacial reaction products near the tripe line.