Hf与Zr为降熔元素镍基钎料对IC10合金的钎焊

Brazing of IC10 superalloy with Ni-based brazing fillers using Hf and Zr as melting-point depressants

关键词:  降熔元素  钎料  高温合金  高温抗拉强度

Key words:  melting-point depressant  brazing filler  superalloy  high temperature tensile strength

摘要:

以Hf,Zr元素及Hf+Zr作为降熔元素再加入一定量的Cr,Co,Mo元素配制了3种镍基钎料并对钎料的性能进行了研究.结果表明,Zr元素的降熔效果比Hf明显,而Hf元素降低钎料硬度的能力比Zr元素强,在对母材的润湿铺展性方面Hf元素的影响比Zr元素大.比较3种钎料钎焊IC10合金的900℃抗拉强度,Hf+Zr为降熔元素的钎料对应的钎焊接头性能最好,单独以Hf为降熔元素的钎料钎焊接头性能略低,而单独以Zr元素为降熔元素的钎料钎焊接头性能最低,Ni-Hf钎料中加入适量的Zr元素可以提高接头的高温力学性能。

Abstract:

Three Ni-based brazing fillers were designed using Hf, Zr and Hf+Zr as melting-point depressant respectively with the addition of a certain amount of Cr, Co, and Mo.The liquidus-temperature, hardness and spreadability of three fillers were measured.The results signify that Hf can decrease the hardness and improve the spreadability of filler more effectively than Zr.But as to the capability of depressing the liquidus-temperature, Zr is superior to Hf.The tensile strengths at 900℃ of the joints bonded with three fillers were also tested.It shows that the strength of joint brazed with the filler using Hf+Zr as melting-point depressant is higher than the others.In particular, Zr-containing filler presents the lowest joint strength.Furthermore, the high-temperature strength of the joint can be improved by adding a certain amount of Zr to Ni-Hf filler.