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为了满足在990~1010℃温度下钎焊不锈钢的需要,研究了一种Ni-Mn-Si-Cu-B-Ce钎料。对钎料的熔化特性和润湿性、接头组织以及钎焊搭接接头的剪切强度进行了研究。结果表明:微量元素B、Ce元素可使BNi66MnSiCu钎料的熔化温度显著降低,从而满足在990~1010℃温度下钎焊不锈钢,加入微量元素B、Ce元素后使钎料对1Cr18Ni9Ti不锈钢的润湿性影响较小,但钎料的剪切强度提高约133倍,利用Ni-Mn-Si-Cu-B-Ce钎料在钎焊1Cr18Ni9Ti不锈钢后,发生了互扩散效应,钎料与母材之间形成了牢固的扩散层;在Ni-Mn-Si-Cu-B-Ce钎料显微组织中,主要存在Ni基固溶体(溶解有微量的Cu)以及Cu_9Si、MnSi、Mn_6Ni_(16)Si_4等化合物相。
In order to meet the need of brazing stainless steel at the temperature of 990 ~ 1010 ℃, a Ni-Mn-Si-Cu-B-Ce solder was studied. The melting properties and wettability of brazing filler metal, the joint structure and the shear strength of brazed lap joints were studied. The results show that the melting temperature of BNi66MnSiCu solder can be significantly reduced by the addition of trace elements B and Ce, so that the brazing stainless steel can be brazed at 990 ~ 1010 ℃. When the trace elements B and Ce are added, the brazing filler metal wetting the 1Cr18Ni9Ti stainless steel However, the shear strength of the solder increased by about 133 times. After the 1Cr18Ni9Ti stainless steel was brazed with Ni-Mn-Si-Cu-B-Ce brazing filler metal, interdiffusion effect occurred. In the microstructure of Ni-Mn-Si-Cu-B-Ce brazing filler metal, Ni-based solid solution (with a small amount of Cu dissolved) and Cu_9Si, MnSi, Mn_6Ni_ (16) Si_4 and so on Compound phase.