電析Fe-W合金めっき膜の切削刃物への応用

抄録

Fe-W amorphous alloy films were prepared on an iron substrate by an electroplating method. The hardness of the heat-treated film was greater than 2, 000 (Hv/50g), according to the Vikers hardness test. By coating the surface of a conventional end-mill with this Fe-W plating film, a cutting tool with very high anti-wear properties can be obtained. This hardening mechanism may be explained by the changes in the crystallographic structure of the plated Fe-W alloy film. The structure changed from crystalline to amorphous as the concentration of W in the film increases. At W concentrations of above 50wt%, the film becomes amorphous. This concentration is in agreement the concentration of an intermetallic compound that become very hard by heat-treatment.