鉄-銅のろう付現象(第 1 報) : 溶融銅による母材鉄の溶解現象

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A basic investigation in brazing was undertaken to study of the dissolution of iron base metal in copper brazing filler metal. Cylinders of iron material were immersed in molten copper and then rotated under dynamic conditions of peripheral velocities from 18.3 to 58.6cm/sec in the temperature range 1200°∿1400℃, exposure times ranging from 40 to 480 sec. Rapid dissolving of the base metal in molten copper occurred and excess dissolved base metal was crystallized within the copper and on the iron-copper interface during solidification. The rate of dissolution of solid iron in molten copper increased with an increasing temperature and rotational speed. A modified first-order kinetic equation based on a mass was used to determine the solution rate constants. These varied from 0.68 to 2.90×(10)^<-2>cm/sec depending on the temperature and the rotational speed, and increased in proportion to 0.60∿0.71 powers of peripheral velocities. The activation energy for dissolution of solid iron in molten copper was estimated to be about 15.3Kcal/mol. The dependence of the solution rate constant on temperature and peripheral velocity and of initial solution rate (the obtained values ranged from 2.88×(10)^<-3> to 3.70×(10)^<-2>g/(cm)^2-sec) on temperature led to the results : the dissolution of solid iron in molten copper is diffusion-controlled, but at higher temperature and higher velocity there is a change in the behaviour of the dissolution, which was reviewed on the basis of effective boundary layer adjacent to the solid metal surface.
社団法人溶接学会の論文
1970-04-25

鉄-銅のろう付現象(第 1 報) : 溶融銅による母材鉄の溶解現象

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