B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
117/53
B05D 1/08 (2006.01) C23C 4/02 (2006.01) C23C 4/08 (2006.01) C23C 4/12 (2006.01) F28F 13/18 (2006.01)
Patent
CA 1162112
12484 THERMOSPRAY METHOD FOR PRODUCTION OF ALUMINUM POROUS BOILING SURFACES ABSTRACT OF THE DISCLOSURE A method for producing a porous boiling surface with exceptional adhesion qualities and mechanical strength while at the same time maintaining the high degree of open cell porosity required for effective boiling heat transfer wherein a bond coating of pure aluminum is produced using a thermospray gun to melt an aluminum wire and impinge the molten aluminum particles against the metallic substrate in an inert gas stream projected from the gun nozzle located between 2 and 4 inches from the substrate. The bond coating has a porosity of less than 15 percent and a thickness not greater than 4 mils. The nozzle to substrate distance is then increased to 4 to 10 inches and a top coating of pure aluminum is formed having a porosity greater than 18 percent and a thickness of at least four times the thickness of the bond coating. S P E C I F I C A T I O N -1-
349224
Grant Andrew C.
Kern James W.
Hopley William G.
Union Carbide Corporation
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