ラジオアイソトープを使用したろう接機構の研究(第1報)
1958 年 27 巻 12 号 p. 745-751
詳細
1958 年 27 巻 12 号 p. 745-751
In brazed boundary, the movement of atoms of metal are studied by using isotopes as tracer. The behaviour of the isotope used in a filler metal at the boundary is observed by autoradiographic method. As the first step, solid solutions, eutectics and peritectics, which are supposed to be formed when the metals are brazed, are studied. Zn 65 was sandwiched between two crystals of a brass of 30% and 15% in content. The diffusion was faster in the former than in the latter. This phenomenon is explainable by the theory of Johnson and Wagner. When copper is brazed with Ag 110, it is found that the atoms of the filler metal move more readily along a special direction in a crystallographic plane of foreign metal. For example, it is always faster in [110] direction than in any of other directions.
Behaviours of Zn 65 in silver and tin are observed by “specific contact autoradiography” with a considerable resolving power. The results by autoradiography are in fair agreement with microphotographic structures.
