选用BNi68CrWB钎料,对低膨胀高温合金GH783的钎焊工艺及接头组织性能进行研究.研究表明,采取BNi68CrWB钎料、钎焊规范为1180℃/10min,钎焊试样焊后进行完全热处理,获得钎焊接头室温拉伸强度最高达到701MPa,接头650℃拉伸强度最高达到了696MPa;钎焊接头的组织由镍-钴基γ固溶体、共晶及其他脆性化合物相构成;钎焊间隙不同,接头中固溶体所占比例不同,0.05mm间隙中元素扩散较充分,接头以固溶体为主,共晶及其他脆性化合物相较少.钎焊间隙对接头性能影响较大,0.05mm钎焊间隙的接头强度明显高于0.1mm间隙接头.
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