Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1997-09-03
2000-10-10
Beck, Shrive
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428630, 428631, 428698, 427427, 4274196, 4274197, 427450, 4273762, B32B 1504, B05D 138, B05D 302
Patent
active
061299944
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a member having a composite coating obtained by laminating a thermally sprayed coating and a vitreous film and a process for producing the same, and more particularly to a member provided with a composite coating having not only improved corrosion resistance and resistance to molten metal but also improved heat resistance and resistance to thermal shock.
BACKGROUND ART
A plated layer such as galvanized coating, hot-dip aluminum coating, hot-dip zinc-aluminum alloy coating or the like develops excellent rust proof power and corrosion proof power, so that it is a surface treated coating used as a member for automobile, aircraft, vehicle, building, household electrical articles and the like.
Among them, the galvanized steel sheets are generally produced by subjecting a surface of a steel sheet to a galvanizing treatment in a continuous galvanizing apparatus. In the continuous galvanizing apparatus are used members for molten metal bath such as a sink roll immersed in a plating bath, a support roll arranged near to the surface of the plating bath, guide rolls for guiding a plated steel sheet passed through these rolls and so on. These members are immersed in a plating bath, or placed in a place to easily be adhered with scattered hot-dip zinc and also used so as to contact with a high temperature steel sheet adhered with the hot-dip zinc, so that they are required to have the following properties. passing plate (steel sheet); maintenance are easy; high-temperature hot-dip zinc bath.
In order to satisfy the above requirements, taking a coating for sink roll, there are proposed the followings: Co-based self-fluxing alloy defined in JIS H8303(1976) as disclosed in JP-B-56-39709, JP-B-58-11507, JP-A-59-153875, JP-A-1-108334, JP-A-64-79356 and JP-A-2-125833; and Al.sub.2 O.sub.3 as disclosed in JP-A-61-117260, JP-B-3-54181 and JP-B-4-27290; Co or the like is co-existent in a non-oxide ceramics such as carbide, nitride, boride or the like as disclosed in JP-B-58-37386, JP-A-2-212366, JP-A-2-180755, JP-A-3-94048, JP-A-4-13857 and JP-A-4-346640; in JP-A-4-13857; coating of W disclosed in JP-A-53-128538, spray coating of Cr disclosed in JP-A-165058 and the like.
In connection with the above techniques, the inventors have studied and developed the same kind of the technique. For example, there are proposed the following techniques and coatings: of not more than 1.8% and a thickness of 0.040-less than 0.10 mm in Japanese Patent Application No. 63-49846 (JP-A-1-225761); of Co to a plasma spraying under a reduced pressure in Japanese Patent Application No. 63-192753 (JP-A-2-43352); .mu.m and a porosity of not more than 1.8% by subjecting a material of ZrB.sub.2, TiB.sub.2 or various carbides containing 5-40% of Ta, Nb to a plasma spraying under a reduce pressure in Japanese Patent Application 1-54883 (JP-A-2-236266); coating consisting essentially of a carbide through chemical densification method in Japanese Utility Model Application No. 1-124010 (JP-Y-3-63565); boride through boridation treatment in Japanese Patent Application No. 2-201187 (JP-A-4-88159); alloy into various carbides, borides or their cermet spray coatings under heating in Japanese Patent Application No. 3-31448 (JP-A-4-254571); spray coating in Japanese Patent Application No. 3-31448 (JP-A-4-254571); adding Al or Al--Zn alloy to non-oxide ceramic powder or powder mixed with a metal in Japanese Patent Application No. 3-222425 (JP-A-4-358055); adding Al--Fe alloy or Al--Fe--Zn alloy to non-oxide ceramic powder or powder mixed with a metal in Japanese Patent Application No. 3-213143 (JP-A-5-33113); than 22% on a surface of a steel roll in Japanese Patent Application No. 3-266874 (JP-A-5-78801).
In this connection, the inventors have found that there are still the following problems to be solved as to the resistance to molten metal in the above spray coatings. That is, are incorporated therein. Therefore, even if the spray coating material is a substance not causing the metallurgical reaction with molten metal, t
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Harada Yoshio
Hisano Hirofumi
Mifune Noriyuki
Barr Michael
Beck Shrive
Miller Austin R.
Tocalo Co., Ltd.
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