Effects of sericite clay coating on controlling the oxides scale formation in the course of heat treatment of 13Cr-stainless steel.

概要

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A new application was found for sericite clay as an antioxidizing coating for controlling the oxides scale formation on the course of heat treatment of 13Cr-stainless steel. The sericite coating in the form of alcoholic suspension was applied by spraying on the surface of the 13Cr4Ni-Stainless steel test piece which was previously warmed at 80°C, then the test piece was heat-treated at the temperatures ranging from 700°C to 1000°C. The thickness of the oxides scale on the surface with the sericite coating of the steel substrate decreased significantly during the period of heat treatment, compared with the case of no coating. It was observed that the thin hexagonal platelets of the sericite particles with mean size of 0.3μm piled up densely with each layer surfaces oriented in direction parallel onto the metal surface and also adhered to the metal surface keeping the basal crystal structure and the particle shape changed to little extent up to 1000°C. Such a good adhesive property of the sericite coat is due to not only its particle shape but also its own thermal properties. These characteristic functions of the sericite clay forming dense film and maintaining adhesive up to 1000°C result in the antioxidizing barrier blocking off air permeation to the metal surface.
日本粘土学会の論文