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US 5,330,813 AGranted
Patch for preventing carburization, nitriding or oxidation, and method of preventing carburization, nitriding or oxidation
AssigneeKabushiki Kaisha Nard Kenkyusho
InventorsKouichi Hirooka, Kouichi Ito, Susumu Tanabe
Life of this patent
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Abstract
A patch for preventing carburization, nitriding or oxidation comprises: a film comprising a heat-fusible or heat-meltable particulate material having an anti-carburizing, anti-nitriding or anti-oxidizing effect and a heat-decomposable resin as a binder; and a heat-resistant silicone pressure sensitive adhesive, which is decomposed at a carburizing, nitriding or oxidizing temperature, provided on one side of the film.
Claims10
A high temperature resistant patch for preventing carburization, nitriding or oxidation which comprises
- a film comprising a heat-fusible or heat-meltable particulate material which is at least one member selected from the group consisting of borax, boron oxide, borosilicic acid, phenylboric acid, water glass, frit, low melting point glass of 300.degree.-500.degree. C., and a powder or crushed foil of a metal having a melting point of not higher than 900.degree. C. having an anti-carburizing, anti-nitriding or anti-oxidizing effect, and a heat-decomposable polyolefin resin as a binder;
- and
- a heat-resistant silicone pressure sensitive adhesive which retains its pressure sensitive adhesive force, which is decomposed at a carburizing, nitriding or oxidizing temperature, provided on a side of the film, wherein an inhibitor of flow of the heat-meltable particulate material at the time of heating is incorporated as an adjuvant in said film, wherein the adjuvant is at least one member selected from the group consisting of titanium oxide, iron oxide, zinc oxide talc, calcium carbonate, silica, aluminum silicate, alumina, zircon, zirconia, magnesia, Silicon carbide, fly-ash, graphite and kaolinite, and wherein from 20 to 95 parts by weight of the particulate material is blended with from 5 to 80 parts by weight of the heat-decomposable polyolefin resin.
A method of preventing carburization, nitriding or oxidation which comprises
- applying a high temperature resistant patch to a portion of a metallic member to be heat-treated to be prevented from being carburized, nitrided or oxidized through pressure sensitive adhesion, thereby protecting the patched portion from carburization, nitriding or oxidation;
- said high temperature resistant patch comprising a film comprising a heat-fusible or heat-meltable particulate material which is at least one member selected from the group consisting of borax, boron oxide, borosilicic acid, phenylboric acid, water glass, frit, low melting point glass of 300.degree.-500.degree. C., and a powder or crushed foil of a metal having melting point of not higher than 900.degree. C,. having an anti-carburizing, anti-nitriding or anti-oxidizing effect, and a heat-decomposable polyolefin resin as a binder;
- and a heat-resistant silicone pressure sensitive adhesive Which retains its pressure sensitive adhesive force, which is decomposed at a carburizing, nitriding or oxidizing temperature, provided on a side of the film, wherein an inhibitor of flow of the heat-meltable particulate material at the time of heating is incorporated as an adjuvant in said film, Wherein the adjuvant is at least one member selected from the group consisting of titanium oxide, iron oxide, zinc oxide, talc, calcium carbonate, silica, aluminum silicate, alumina, zircon, zirconia, magnesia, silicon carbide, fly-ash, graphite and kaolinite, and wherein from 20 to 95 parts by weight of the particulate material is blended with from 5 to 80 parts by weight of the heat-decomposable polyolefin resin.
Dependencies are inferred from the claim text.