Coating processes – Spray coating utilizing flame or plasma heat – Continuous feed solid coating material
Patent
1997-11-25
1999-09-14
Bareford, Katherine A.
Coating processes
Spray coating utilizing flame or plasma heat
Continuous feed solid coating material
427447, 427454, 427455, C23C 418
Patent
active
059520540
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a spraying method, and in particular, relates to a method for forming fine spray deposits having superior adhesion capability.
BACKGROUND ART
Conventionally, when a sprayed deposit was subjected to sealing processing, processing was conducted in which, after the completion of spraying, a sealer was applied or sprayed onto the deposit, and where necessary, baking processing was conducted.
Accordingly, there were cases in which the sealing processing was insufficient, because the sealing did not sufficiently penetrate to the lower layer of the deposit or the like.
Furthermore, the present inventors have previously proposed interrupting spraying during the formation of a spray deposit and conducting sealing processing (Japanese Patent Application No. HEI 6-321207), however, with this method, there were problems with the removal of excess sealer, the oxidation of the spray deposit, and the like, and there were numerous cases in which a sufficiently fine spray deposit could not be obtained, and the corrosion resistance with respect to acidic and alkaline solutions was also insufficient.
The problems to be solved in the conventional technology described above are the ability to conduct sealing processing uniformly throughout the whole thickness of the sprayed deposit, so as to obtain a fine deposit. For example, this would involve the provision of a deposit having sufficient corrosion resistance with respect to acidic or alkaline chemicals, the provision of a spray deposit which is resistant to penetration by molten metals, the provision of a spray deposit as an anti-corrosion treatment for the base metal, and the like.
The present invention has as an object thereof to provide a spray deposit which will reliably allow the incorporation in the spray deposit of a material which is difficult to spray or a material which is easily oxidized and hence can not be sprayed, and will also allow the exploitation of the properties of this material.
This would involve, for example, the execution, on a paper making roller, of a spray deposit which facilitates removal of the paper, the provision of a spray deposit which is resistant to molten metal as a molten metal plating bath material, the provision of a spray deposit having particularly superior resistance to abrasion or the like.
The present invention solves the problems present in the conventional technology described above; it has as an object thereof to provide a fine spray deposit having excellent adhesion capabilities.
DISCLOSURE OF INVENTION
In order to attain the object described above, as a result of diligent research, the present inventors have discovered that conducting sealing processing parallel to at the same time of conducting spraying onto a target object is effective, and have thus arrived at the present invention.
The present invention, which was created based on the above discoveries, has as a feature thereof a method of forming spray deposits in which, during the formation of a spray deposit, while a spray is conducted with respect to a target object using a flame spraying machine, a sealer is sprayed or applied, and deposit making processing and sealing processing are conducted in a parallel manner.
Furthermore, the followings are also features of the present invention: the formation of a spray deposit using a gas spray mechanism, a plasma spray mechanism, or a wire metallizing mechanism; the fact that the spray material comprises a metal, a cermet, or ceramic; the fact that the sealer comprises a material producing an oxide such as Cr.sub.2 O.sub.3, Al.sub.2 O.sub.3, SiO.sub.2, ZrO.sub.2, or the like; and the fact that by means of conducting sealing processing using one or more of silicon compounds, boron compounds, fluorine compounds, nitrogen compounds, and carbon compounds as the sealer which is sprayed or applied during spraying, one or more of silicides, borides, fluorides, nitrides, and oxides are formed in the deposit.
Additionally, the following are also features of the present inventions
REFERENCES:
The Science and Engineering of Thermal Spray Coatings, Lech Pawlowski, John Wiley & Sons, pp. 64-66, 1995 (no month date).
Thermal Spraying| Practice, Theory, And Application, American Welding Society, p. 108, 1985 (no month date).
Brazing Technic and It's application, Masakatsu Umagome, Shikoku Kogyo Association, Takamatsu Japan 1989, pp. 9-15 (no month date).
Brazing Handbook by Japan Brazing Association, Tokyo, Japan, Oct. 25, 1994, pp. 388-398.
Migita Atsushi
Sato Takao
Tarumi Kiyohiro
Bareford Katherine A.
Nippon Steel Hardfacing Co. Ltd.
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