Representation system of cleanness of filler metal  

作　　者：龙伟民 鲍丽 马佳 钟素娟 张冠星 

机构地区：[1]State Key Laboratory of Advanced Brazing Filler Metals and Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou, 450001.

出　　处：《China Welding》2015年第2期12-17,共6页中国焊接（英文版）

摘　　要：The high quality of filler metals are required by the equipment manufacturing industry to obtain the high- performance brazed joint. For the problems of impurities in filler metal, the concept of entropy has been carried out to describe the cleanness of filler metal. The math expressions of process entropy, Sp, and performance entropy, Sf , have been presented. Sp characterizes the manufacturability of filler metal, corresponding to the spreading coefficient and the viscosity. SI characterizes the mechanical property of the brazed joint, corresponding to the tensile strength and the shear strength. With the inerease of entropy value, the cleanness as well as the brazability of filler metal and the mechanical property of joint deteriorate. The physical verification indicates that the expressions of St, and Sf could characterize the cleanness of filler metal.The high quality of filler metals are required by the equipment manufacturing industry to obtain the high- performance brazed joint. For the problems of impurities in filler metal, the concept of entropy has been carried out to describe the cleanness of filler metal. The math expressions of process entropy, Sp, and performance entropy, Sf , have been presented. Sp characterizes the manufacturability of filler metal, corresponding to the spreading coefficient and the viscosity. SI characterizes the mechanical property of the brazed joint, corresponding to the tensile strength and the shear strength. With the inerease of entropy value, the cleanness as well as the brazability of filler metal and the mechanical property of joint deteriorate. The physical verification indicates that the expressions of St, and Sf could characterize the cleanness of filler metal.

关 键 词：cleanness process entropy performance entropy SPREADABILITY FLUIDITY mechanical property 

分 类 号：TG146.21[一般工业技术—材料科学与工程] U466[金属学及工艺—金属材料]