SURFACE MODIFICATION METHOD FOR HEAT INSULATING FILM

摘要

PURPOSE:To perform surface modification capable of preventing the peeling of a heat insulating film composed of a ceramic layer formed. on a base material via a metallic binding layer. CONSTITUTION:A heat insulating film 3 (about 200-400mum thickness) composed of ceramics is formed on a base material 1 via a metallic binding layer 2 by means of atmospheric pressure plasma thermal spraying. A surface modified layer 7 (about 10-100mum thickness) composed of a dense film (<=1.0% porosity) is formed on the surface of the film 3 by means of low pressure plasma thermal spraying or PVD. Because this surface modified layer 7 is dense, the infiltration of high temp. gas 5 into the heat insulating film 3 during operation can be prevented.