Thermal spray method utilizing in-transit powder particle temper

Details Thermal spray method utilizing in-transit powder particle temper Thermal spray method utilizing in-transit powder particle temper

1991-08-06

1993-12-21

Lusignan, Michael

Coating processes

Spray coating utilizing flame or plasma heat

427450, 427456, B05D 108

Patent

active

052719650

ABSTRACT:
A method of operation of a plasma torch, an internal burner or the like to produce a hot gas jet stream directed toward a workpiece to be coated by operating the plasma torch or internal burner at high pressure while feeding a powdered material to the stream to be heated by the stream and projected at high velocity onto a workpiece surface. The improvement resides in expansion of the hot gas prior to feeding of the particles into the jet stream thereby limiting the heating of the powdered material by the jet stream to that only sufficient to raise the temperature of the particles of the powdered material to a temperature lower than the melting point of the material, and maintaining the in-transit temperature of the particles to the workpiece below that melting point, while providing a sufficient velocity to the particles striking the workpiece to achieve an impact energy transformation into heat to raise the temperature of the particles to fusion temperature capable of fusing the material onto the workpiece surface as a dense coating.

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