Coating processes – Solid particles or fibers applied – Plural particulate materials applied
Patent
1976-03-03
1977-09-27
Smith, Ronald H.
Coating processes
Solid particles or fibers applied
Plural particulate materials applied
427180, 427202, 427205, 427318, 427319, 427348, 427349, 427369, 427374B, 427398D, 428306, 428309, 428422, B05D 138
Patent
active
040512754
ABSTRACT:
The process described herein involves a method of compacting and increasing the amount of particles, such as polytetrafluoroethylene, etc., deposited in fissures in a surface which involves heating the surface to expand the size of the fissures or pores in the surface, then depositing in the expanded fissures finely divided particles at a temperature at least 100.degree. F, preferably at least 300.degree. F below the temperature of the surface, and subsequently permitting the temperature of the surface and of the particles to come to equilibrium whereby the particles are locked into the fissures by interference fit. The surface is then subjected to a blasting fluid stream carrying finely divided particles applied at a pressure of 30-120 psi, preferably 40-80 psi, to compact the particles in the fissures, after which the original treatment is repeated by heating the surface, depositing additional finely divided particles at a temperature at least 100.degree. F below the temperature of the surface so that the additional particles are also locked into the fissures. The blasting operation and subsequent treatment to lock additional particles in the fissures improves markedly the useful life of the treated surface.
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Lawrence Evan K.
Monacelli Walter J.
Smith Ronald H.
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