日本金属学会誌

J. Japan Inst. Metals, Vol. 52, No. 3 (1988),
pp. 348-354

Bonding of Steels using Thermal Spray Coatings

Shuichi Kamota1, Masahiro Sakai1, Kohsuke Tagashira2, Tadashi Igarashi1 and Masanobu Akanuma1

1Hokkaido Industrial Research Institute, Sapporo
2Department of Mechanical Engineering, Muroran Institute of Technology, Muroran

Abstract:

A new method for the bonding of metals is proposed. The method includes thermal spray coatings of a self-fluxing alloy on the bonding surfaces. The bonding of mild steels, which had been spray-coated with nickel base alloy powders, was attempted at 1253--1333 K for 60 s-10.8 ks mainly in Ar gas without any bonding pressure except the dead load of test pieces themselves. The bonding region showed satisfactory metallographic structures, but only a few pores were observed. The tensile strength of the bonded joints was over 310 MPa for an optimum bonding condition. The similar tensile strength was also obtained in the bonding atmospheres of the air and a vacuum (1.33×10-2 Pa) as well as in Ar gas. Fractures occurred mostly in the diffusion zone in the bonding region where small voids were located. It is assumed that these voids might be the unbonded spots at the initial interface between the mild steel and the spray coatings.


(Received 1987/8/31)

Keywords:

bonding, brazing, thermal spray coatings, mild steel, nickel base self-fluxing alloy, bonding atmosphere, bonding strength, microstructure


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