Flame sprayed coatings of material from solid wire or rods

Details Flame sprayed coatings of material from solid wire or rods Flame sprayed coatings of material from solid wire or rods

1992-12-09

1995-01-24

Beck, Shrive

Coating processes

Spray coating utilizing flame or plasma heat

Continuous feed solid coating material

427446, 239 83, B05D 108

Patent

active

053841646

ABSTRACT:
A plasma jet or a supersonic flame jet emanating from an internal burner combusting compressed air and fuel is applied to a solid rod coaxially within the flame or plasma jet to heat, atomize and project a spray of initially liquid droplets of the rod material separating from the tip of the rod in the direction of a workpiece for impact against a workpiece surface for solidification to form a coating thereon. The process involves the control of the transit of the initially liquid droplets from the tip of the rod over the path of travel to the surface of the workpiece to ensure that at the moment of impact against the surface of the workpiece the rod material particles are least partially solid. The stand-off distance may be set to ensure that the initially liquid droplets pass through an upstream liquid region and a contiguous downstream transit region to effect the partial solidification of the molten liquid droplets prior to impact. The control of the transit of the initially liquid droplets may be effected by adding a liquid or gas coolant into the jet stream to cool both the jet stream gases and the initially liquid droplets downstream of the point where the liquid droplets separate from the tip of the rod.

REFERENCES:
patent: 2125764 (1938-08-01), Benoit
patent: 2861900 (1958-11-01), Smith et al.
patent: 4121083 (1978-10-01), Smyth
patent: 4235943 (1980-11-01), McComas et al.
patent: 4568019 (1986-02-01), Browning
patent: 4634611 (1987-01-01), Browning
patent: 4960458 (1990-10-01), Browning
patent: 5120582 (1992-06-01), Browning

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