Equipment for use in molten metal plating bath

Details Equipment for use in molten metal plating bath Equipment for use in molten metal plating bath

1998-05-19

2000-05-23

Footland, Lenard A.

Bearings

Rotary bearing

Plain bearing

384913, F16C 1702

Patent

active

060658762

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to various types of equipments for use in baths employed in plating of non-ferrous metals other than copper, such as, for example, molten zinc plating, molten aluminum plating, or plating of molten zinc-aluminum alloys; in particular, the present invention relates to various types of equipments used in baths which are disposed within molten metal plating baths having a composition such that silicon nitride (Si.sub.3 N.sub.4) is the main component thereof (for example, bath rollers [support rollers, synch rollers, and the like], roller bearings, roller arms, melting boxes, snouts, pumps within baths, thrust locks, and the like).


BACKGROUND ART

Conventionally, materials resistant to melting and metal corrosion such as low carbon steel, high chromium steel, and SUS316L, and the like, were commonly employed for various types of equipments used in baths employed in molten zinc plating, molten aluminum plating, or the plating of molten zinc-aluminum alloy.
In a case of requiring greater resistance to corrosion than that offered by these materials resistant to melting and metal corrosion, it is common to build up metal by welding or to form a film by flame spraying on the surfaces of these metal implements and equipments using one or a mixture of two or more of oxides, borides, nitrides, carbides, fluorides, and the like of various corrosion resistant metals such as W, Co, Mo, and Cr and the like. In this case, the service life during which such implements or equipments could be continuously employed without causing defects in the high grade products was within a range of 15-90 days.
In order to improve the productivity of the manufacturing industry, it is necessary to operate facilities over a long period of time without affecting the quality of the materials produced.
In order to respond to this need in molten metal plating operations, it is necessary that the service life, during which the implements and equipment used within the plating bath can be continuously employed, be as long as possible, in addition to management of the plating baths.
The present invention solves the problems in the conventional technology described above; it is an object thereof to provide various types of equipments for use in molten metal plating baths which are capable of stable use over a long period of six months or more.


DISCLOSURE OF THE INVENTION

In order to attain the above object, the present inventors have conducted diligent research, and as a result discovered that it is effective to form various equipments for use in molten metal plating baths using a composition having as a main component thereof silicon nitride, which is a material which does not react with the molten metal and which is easily worked; the present invention was completed based on this discovery.
The invention based on this discovery comprises equipments used in baths, such as rollers, bearings, roller arms, melting boxes, snouts, pumps, thrust locks, and the like, which are disposed within molten metal plating baths, and which is formed by a composition containing Si.sub.3 N.sub.4 : 70-95%, Al.sub.2 O.sub.3 : 2-10%, AlN: 1-10%, Y.sub.2 O.sub.3 : 1-10%, and unavoidable impurities.


BRIEF DESCRIPTION OF THE DIAGRAMS

FIG. 1 is a cross-sectional view showing a molten metal plating device employing a roller in accordance with the present invention.
FIG. 2(a) is a side view showing an embodiment of a bearing for a support roller in accordance with the present invention.
FIG. 2(b) shows a front end of an axle shown in FIG. 2(a).
FIG. 3 is a side view showing another embodiment of a bearing for a support roller in accordance with the present invention and a cross-sectional view of this bearing.
FIG. 4 shows a bearing combined with the synch roller bearing part of the present invention.


______________________________________ Description of the References ______________________________________ 1 plating steel plate 2 molten metal bath 3 snout 4 synch roller 5 synch roller holder 6 suppor

REFERENCES:
patent: 4634300 (1987-01-01), Takebayashi et al.

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