摘要
采用Ti-Cu混合粉为焊料,对多孔TiAl金属间化合物与434L不锈钢进行真空钎焊连接,测试异种材料连接件的整体拉伸性能;并用扫描电子显微镜(SEM)和X射线衍射仪(XRD)对接头界面组织结构进行观察和分析。结果表明,采用Ti-Cu粉焊料可以实现此类异种材料间的连接;优化的焊接工艺参数为:焊接温度955℃及焊接时间240s,连接件的室温抗拉强度为65MPa;接头界面结构依次为多孔TiAl,Ti3Al+Ti2Cu,TiCu+Ti2Cu,富Ti层,富Fe层及不锈钢。
Vacuum brazing of porous TiAI intermetallic to 434L stainless steel was carried out with Ti-Cu filler metal powder. The tensile strength of dissimilar materials bonding joint was measured; and the interface micro-structure of the joint was observed by means of SEM and XRD. The experimental results show that the dissimilar materials bonding of porous TiAl intermetallic and 434 L stainless steel can be performed with Ti-Cu filler metal powder; the optimum welding parameters are： brazing temperature of 955℃ and brazing time of 240 s; the maximum tensile strength of the joint is up to 65 MPa at room temperature; the interface structure of the joint is porous TiAl, Ti3Al＋Ti2Cu, TiCu＋Ti2Cu, Ti-rich layer, Fe-rich layer and 434L stainless steel sequentially.
出处
《粉末冶金材料科学与工程》
EI
2008年第1期30-34,共5页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(20476106
20636020)
湖南省自然科学基金资助项目(05JJ30097)
