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Ag-Cu-In-Ti钎料钎焊SiO2f/SiO2复合材料与钼合金的接头组织及机理

Microstructures and joining mechanism of vacuum brazing of SiO2f/SiO2 composite to Mo alloy using Ag-Cu-In-Ti brazing fillers mechanism

    摘要
  • 摘要: 设计了3种Ag-Cu-In-Ti钎料,在800 ℃/10 min工艺下实现了SiO2f/SiO2复合材料与钼合金的连接. 室温下测试了接头的抗剪强度,通过扫描电镜、电子探针、能谱仪和X射线衍射仪分析了接头的微观组织和界面产物. 结果表明,1号钎料所得接头平均抗剪强度最高,为24.1 MPa,其中Ti元素发挥了活性作用而富集在母材两侧的反应层,与SiO2发生反应为Ti+SiO2→TiSi2+TiO,伴随反应为Ti+Cu+O→Cu3Ti3O,并有一部分以Cu3Ti的形式块状分布在钎缝中,提高了接头的强度. 1号钎料接头产物依次为SiO2→Cu3Ti3O+TiO+TiSi2→Ag(s, s)/Cu3Ti/Cu(s, s)→Cu3Ti+TiO→Mo.

     

    Abstract: Three kinds of Ag-Cu-In-Ti brazing filler were designed for joining of SiO2f/SiO2 composite to Mo alloy. The brazing experiment was conducted at 800 ℃ for 10 min under vacuum condition. The joint shear strengths were tested at ambient temperature. The microstructures were observed under a scanning electron microscopy(SEM), and the reaction products were analyzed by EPMA, EDS and XRD. The results show that the joints brazed with 1# brazing filler offer the maximum shear strength of 24.1 MPa. Part of Ti element is enriched at interfacial reaction layer, the other part is distributed within the joint matrix as Cu3Ti to enhance the joint. The mechanism of joining SiO2f/SiO2 composite by Ag-Cu-In-Ti brazing filler is the reaction of Ti with SiO2: Ti+SiO2→TiSi2+TiO, followed by the subsequent reaction: Ti+Cu+O→Cu3Ti3O. The product sequence for 1# joint can be described as the following: SiO2→Cu3Ti3O+TiO+TiSi2→Ag(s,s)/Cu3Ti/Cu(s,s)→Cu3Ti+TiO→Mo.

     

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