Coating processes – Spray coating utilizing flame or plasma heat – Inorganic carbon containing coating – not as steel
Patent
1994-11-29
1996-12-10
Bareford, Katherine
Coating processes
Spray coating utilizing flame or plasma heat
Inorganic carbon containing coating, not as steel
427450, 427456, 492 20, 492 36, C23C 406
Patent
active
055828744
ABSTRACT:
A method for forming a hardened coating on a workpiece, such as a corrugating roll, having an undulated surface. A high velocity oxygen fueled gun is aligned with the undulated surface and a coating material is sprayed onto the surface from the gun to form a hardened coating having substantially uniform surface characteristics. The coating material is a tungsten carbide-cobalt material, or other hard carbide or oxide materials, which is sprayed onto the surface in a direction which is parallel to and offset from a plane passing through the longitudinal center of the roll. During the spraying operation, the gun is traversed along the length of the roll while the roll is rotated.
REFERENCES:
patent: 4839239 (1989-06-01), Ducos et al.
patent: 4986181 (1991-01-01), Kobayashi et al.
Union Carbide Article, Problem Solving Technology (UCAR coating applied by detonation gun extends wear life of corrugating rolls) 1990 (no month date).
HVOC-Spray Technology, Poised for Growth, Danial W. Parker and Gerald L. Kutner, General Plasma, Inc., reprinted from Apr. 1991 issue of Advanced Materials & Processes.
Tungsten Carbide coating enhances corrugator roll life article, 1993 International Paper Board Industry, Sep. 1993.
"Influence of Different Gases on the Mechanical and Physical Properties on HVOF Sprayed Tungsten Carbide Cobalt", T. Kraak, et al, Thermal Spray: International Advances in Coatings Technology, May-Jun./1992 pp. 153-158.
Bareford Katherine
United Container Machinery Group, Inc.
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