POWDER FOR APPLICATION BY THERMAL SPRAYING

PURPOSE:To prevent the occurrence of abnormal wear on the internal surfaces of instruments for passing through B4C in a thermal spraying apparatus by using powdered B4C as raw material after mixing specific amounts of fine and soft BN with the above powdered B4C at the time of plasma-spraying super...

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Hauptverfasser:	SAITO KIYOSHI, OKUMURA MASATOMI
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE CEMENTS CERAMICS CHEMICAL SURFACE TREATMENT CHEMISTRY 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 COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIME, MAGNESIA METALLURGY REFRACTORIES SLAG SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	PURPOSE:To prevent the occurrence of abnormal wear on the internal surfaces of instruments for passing through B4C in a thermal spraying apparatus by using powdered B4C as raw material after mixing specific amounts of fine and soft BN with the above powdered B4C at the time of plasma-spraying super hard B4C onto the surface of a substrate. CONSTITUTION:A super hard substance, B4C, is thermally sprayed on the surface of a substrate 7 by means of an Ar plasma flame 1, etc., to form a B4C sprayed deposit 8. At this time, since B4C has extremely high hardness and angular shape, respective internal surfaces of a B4C supply hose 5 connecting a hopper 2 in which B4C 3 is placed and a powder port 4, a connecting pipe 6, and the powder port 4 are remarkably worn owing to B4C. In order to prevent the above wear, a soft hexagonal BN powder 10 of =3000 deg.C by the plasma flame 1, and the sprayed deposit 8 of the super hard B4C can be easily obtained.