Ni系ろう材によるSUS304鋼のろう接性について

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Recently nickel base amorphous filler metal has been prepared by a liquid rapidly solidification method, what is used for joining of stainless steel and heat resistant materials in nuclear energy and space industries. The merits of amorphous filler metal are as follows : (1) The joint has no defect by void, because the nickel base amorphous filler metal does not use biner. (2) Using the sheet of amorphous brazing filler metal enables us to get the complex joining. However, estimation methods of the brazability and brazing system of sheet filler metal so far have not been established clearly. In this paper, we proppse an estimation procedure for his problem, which is verified in terms of the nickel base amorphous filler metal on SUS304 stainless steel by observing its cross-sectional structure and measuring its fillet shape. Both T-joint-and slope method are adopted to estimate the brazability. The brazing filler metal used is of Ni-P eutectic composition (Ni-11wt%P). Results obtained are : (1) Formation of a brazed joint depends on the concentration of molten brazing filler metal at low temperature and formation of a fillet on the interface reaction between molten filler- and base metal at high temperature respectively. (2) Brazability estimated by the fillet formability of this brazing filler metal approximately equals to that of other types of brazing filler metal. (3) Reaction phenomena between molten filler- and base metal estimated by the erosion ratio appear to be smaller compared to other types of brazing filler metal. (4) The clearance fillability by the slope method depends on the spreading of molten brazing filler metal. (5) The bonding ability of liquid phase diffusion for the brazing filler metal used is worse than that of other types of brazing filler metal (Ni-Si-B system).

Ni系ろう材によるSUS304鋼のろう接性について

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