Methods and apparatus for applying wear resistant coatings to ro

Details Methods and apparatus for applying wear resistant coatings to ro Methods and apparatus for applying wear resistant coatings to ro

1979-10-30

1981-04-14

Newsome, John H.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427423, 4274192, 4274197, 406138, 219121PL, B05D 108

Patent

active

042620341

ABSTRACT:
A coating of wear resistant tungsten carbide is applied to a photo-etched roto-gravure cylinder, the coating having a thickness in the range of from 15 to 35 microns. Tungsten carbide powder is supplied to a plasma flame spray gun by means of a powder feeder which supplies powder particles at a uniform density and at given sizes. The feeder comprises a hopper having air inlet and outlet passages and vertically spaced porous membranes which confine the powder and permit the passage of air. Air flow through the hopper suspends the powder particles of a desired diameter range adjacent a spray gun feed conduit. When copper cylinders are to be coated, the surface is allowed to oxidize to promote a chemical bonding of the coating to the surface.

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