Apparatus and process for producing high density thermal spray c

Details Apparatus and process for producing high density thermal spray c Apparatus and process for producing high density thermal spray c

1987-12-28

1989-09-26

Beck, Shrive

Coating processes

Roller applicator utilized

118 47, 239 79, 239 81, 239 85, 239290, 239296, 239405, B05D 108

Patent

active

048699365

ABSTRACT:
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 surface 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 persists 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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patent: 4684296 (1987-08-01), Horii

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