Method of forming densified layer in thermal spray coating, and thermal spray coating covering member

Provided is a method of forming a densified layer in a thermal spray coating in which a sufficiently effective densified layer is formed while avoiding occurrence of excessively large cracks, and which does not invite cost increases; also provided is a thermal spray coating covering member. When sca...

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Bibliographische Detailangaben
Hauptverfasser:	INABA, MITSUHARU, YOKOTA, HIROKI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL CHEMICAL SURFACE TREATMENT CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY PERFORMING OPERATIONS PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL SOLDERING OR UNSOLDERING SPRAYING OR ATOMISING IN GENERAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	Provided is a method of forming a densified layer in a thermal spray coating in which a sufficiently effective densified layer is formed while avoiding occurrence of excessively large cracks, and which does not invite cost increases; also provided is a thermal spray coating covering member. When scanning the surface (5a) of an Al2O3 thermal spray coating (5), the high-energy beam for re-melting and re-solidifying the coating composition of the surface layer (6) of the Al2O3 thermal spray coating (5) is configured from a precursor laser beam (20) which is scanned initially in the scanning direction, and from a following laser beam (21) which scans following the same trajectory as the precursor laser beam, and the high-energy beam is irradiated while the precursor laser beam (20) scans the surface (5a) of the Al2O3 thermal spray coating (5) and again while the following laser beam (21); scans the irradiated region (22) that has been scanned with the precursor laser beam (20), thus densifying the surface layer (