High efficiency nozzle for thermal spray of high quality,...

Details High efficiency nozzle for thermal spray of high quality,... High efficiency nozzle for thermal spray of high quality,...

2005-01-25

2005-01-25

Mar, Michael (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Rigid fluid confining distributor

C239S081000, C239S079000, C239S601000

Reexamination Certificate

active

06845929

ABSTRACT:
The present invention provides a spray gun with associated nozzle attachments for high deposition efficiency for thermal spray of high quality, dense, low oxide content coatings. The spray guns are used to produce coatings using a thermal spray process, a high velocity oxy-fuel process, a high velocity air-fuel process, cold spraying, and plasma spraying in which the process is characterized by having an over-expanded flow with a Mach number from about 1.0 to about 4.0 which have passageway section which diverges to the gun outlet. In one embodiment the nozzle attachment is another diverging section with a greater angle of divergence than the diverging nozzle section. In another embodiment the nozzle attachment includes the aforementioned diverging nozzle attachment section followed by a converging nozzle section having an outlet section through which the thermal spray is emitted.

REFERENCES:
patent: 3064114 (1962-11-01), Cresswell
patent: 3077108 (1963-02-01), Gage et al.
patent: 3823302 (1974-07-01), Muehlberger
patent: 4004735 (1977-01-01), Zverev et al.
patent: 4688722 (1987-08-01), Dellassio et al.
patent: 4741286 (1988-05-01), Itoh et al.
patent: 5041713 (1991-08-01), Weidman
patent: 5217746 (1993-06-01), Lenling et al.
patent: 2758476 (1998-07-01), None

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