Apparatus and process for producing high density thermal...

Details Apparatus and process for producing high density thermal... Apparatus and process for producing high density thermal...

B - Operations, Transporting

05

B

117/53, 32/60

B05B 7/20 (2006.01) B05B 17/06 (2006.01) B05D 1/08 (2006.01) C23C 4/12 (2006.01)

Patent

CA 1296178

ABSTRACT OF THE DISCLOSURE An attachment for supersonic thermal spray equipment by which inert shield gas is directed radially outwardly about the central core of a supersonic, particle-carrying flame to isolate the same from ambient atmosphere. The shield gas is injected tangentially against the inner sur- face of a constraining tube attached to and extending from the discharge end of the thermal spray gun nozzle, causing the shield gas to assume a helical flow path which per- sists until after it exits the tube and impacts the work piece. A process using the shielding apparatus with a high-velocity, thermal spray gun and employing oxygen and hydrogen as gases of combustion and inert gas to introduce metal powder, having a narrow particle size distribution and low oxygen content, into the high-velocity combustion gases, produces significantly improved, high-density, low- oxide metal coatings on a substrate.

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