多元铜基中温微晶硬钎料的试验研究及回归模型  

Regression Modeling and Experimental Analysis of the Multi-element Cu Base Medium Temperature Brazing Filler Metal Powder with Fine Grain

作　　者：刘楚明[1] 张靖[1] 李慧中[1] 周海涛[1] 陈明安[1] 

机构地区：[1]中南大学

出　　处：《特种铸造及有色合金》2005年第8期465-468,共4页Special Casting & Nonferrous Alloys

摘　　要：采用气雾化方法制备了Cu-15.5Sn-5P-4.5Ni-0.4Mn粉末微晶钎料,在685℃/20min条件下炉中真空钎焊T1紫铜板,搭接长度6mm,钎缝宽度0.3mm,研究了钎料熔点、钎焊接头微观组织和力学性能。结果表明:粉末钎料晶粒小于10μm,DTA测得钎料的固相线和液相线分别为576℃和596℃,剪切强度为176.965MPa,断裂机理为准解理断裂。在一定数量的Cu-Sn-P-Ni系合金力学性能、熔点与相应化学成分的试验数据基础上,采用多元线性回归方法对铜基中温钎料的成分进行优化设计,建立了剪切强度、固相-液相线温度与成分之间的回归数学模型,理论计算与实测值的误差均小于5%,证明模型可用。A kind of Cu-15.5Sn-5P-4.5Ni-0.4Mn brazing filler metal powder produced by gas atomization was used to weld T1 copper plate at 685 ℃ for 20 min,in which the joint length is 6mm and brazing gap thickness is 0.3 mm.The brazing filler melting point,microstructure and mechanical properties of joining were research.It was revealed that grain size of brazing filler metal powder is lower than 10 μm,and solidius and liquidius temperature is 576 ℃ and 596 ℃ respectively from DTA measurement,and the shearing strength is (176.965 MPa,)and the fracture mechanism exhibits quasi-cleavage fracture.A regression mathematical model on relation among shearing strength,solid-liquid temperature and chemical composition is built up through optimized design for chemical composition of the brazing filler metal powder based on a amount of experimental data from mechanical properties,melting point and corresponding chemical composition.The model is available for the alloy due to the difference between calculated value and measured ones lower than 5%.

关 键 词：多元线性回归 成分 剪切强度 熔点 微晶 

分 类 号：TG425[金属学及工艺—焊接]