钯合金管与不锈钢镀金钎焊性能研究

Brazing Properties on Palladium Alloy Tubes and Gold Plated Stainless Steel

摘要: 本文通过对薄壁钯合金管与镀金不锈钢法兰和常规镀镍的不锈钢法兰试样进行了真空钎焊对比试验，观察了钎焊接头的微观组织形貌，并对接头区域的成分进行了分析。研究表明不锈钢表面镀金后，可以明显提高AgCu28银铜焊料对不锈钢基体的润湿作用，金镀层在钎焊过程中能与基体金属和钎料相互扩散，提高焊接接头密封性和焊接强度，而镀镍不锈钢，由于钎料与镍的相互作用较弱，因此焊缝的强度较低。

Abstract: The vacuum brazing of thin wall palladium alloy tubes with nickel plated stainless steel and gold plated stainless steel was performed using AgCu28 filler alloy. The microstructure and the composition of the welding joint were analyzed. The experiment result showed that the wettability of Ag-Cu filler alloy on the stainless steel substrate was improved after gold plated, and the plated layer can strongly bond with base metal and filler metal by the mutual diffusion. So, a good sealing performance and mechanical properties of the brazing joint were obtained. The mechanical properties of the brazing joint of Ag-Cu filler alloy and nickel plated stainless steel were low because of their weak metallurgical functions.