Al_2O_3陶瓷与Cr12钢活性钎焊接头的组织和性能探讨

Discussion on Microstructure and Mechanical Properties of Alumina Ceramic and Cr12 Steel Active Brazed Joints

采用自行设计制备的Cu-Sn-Ti-Ni活性粉末钎料,在钎焊温度890~930℃,保温时间5~20 min的条件下,对Al2O3陶瓷与Cr12钢进行真空钎焊试验,利用扫描电镜和能谱分析对钎焊界面的微观组织进行了分析。结果表明：钎料与两侧母材润湿良好并形成良好的冶金界面结合;钎焊过程中,钢母材中的Fe元素向钎料层中扩散,钎料中的Ti元素向母材两侧扩散并聚集,在钎料层钢母材侧生成Ti Fe2和Ti C化合物。对接头抗剪强度的分析结果表明,在钎焊温度890℃、保温时间10 min的条件下,接头的抗剪强度最高,达118 MPa。

Using self-developed Cu-Sn-Ti-Ni active filler powder, a series of the brazing tests were carried on Al2O3 ceramics and Cr12 steel at 870-930 ℃ for 5-20 min. The microstructure of the joints brazed was evaluated by SEM and EDS.The results show that it has a good wetting and metallurgical bonding between filler and the both side of the base metal. In brazing process, Fe element of the base of steel diffuses into filler layer; Ti element of filler diffuses into the both side of the base metal and forming Ti Fe2 and Ti C compounds in filler layer side of steel base metal. The maximum shear strength of the welded joints was 118 MPa, which is achieved when the brazing temperature is 890 ℃ and holding time is 10 min.