초록 ▼

A high velocity, high pressure plasma gun operates in stable fashion and with a relatively constant arc input power using a highly combustible arc gas such as nitrogen. The gun includes an anode having an internal arc chamber and a nozzle extending through the anode from the arc chamber. The gun als

A high velocity, high pressure plasma gun operates in stable fashion and with a relatively constant arc input power using a highly combustible arc gas such as nitrogen. The gun includes an anode having an internal arc chamber and a nozzle extending through the anode from the arc chamber. The gun also includes a cathode disposed within the anode and having a generally cylindrical tip portion with a flat surface facing the arc chamber and formed by a tungsten insert in the tip portion. The arc chamber, which has a wall of varying slope along the length thereof, may comprise successive conical portions of different slope and shape, or it may comprise a bell-shaped configuration. The flat surface of the cathode tip portion and the varying wall slope of the arc chamber combine to prevent the arc produced by nitrogen or other highly combustible arc gases form burning or otherwise damaging the cathode tip and the arc chamber.

대표청구항 ▼

A high velocity, high pressure plasma gun comprising the combination of: an anode having an internal arc chamber therein and a nozzle extending through the anode from the arc chamber and having a static pressure at the outside thereof; a cathode disposed within and electrically insulated from the an

A high velocity, high pressure plasma gun comprising the combination of: an anode having an internal arc chamber therein and a nozzle extending through the anode from the arc chamber and having a static pressure at the outside thereof; a cathode disposed within and electrically insulated from the anode and having a cooling chamber therein and a tip portion extending into the arc chamber from the cooling chamber, the tip portion being of generally cylindrical configuration and presenting a relatively flat surface to the arc chamber, the tip portion being relatively thin between the relatively flat surface and the cooling chamber to provide substantial cooling of the relatively flat surface by the cooling chamber, the arc chamber having a central axis and a wall extending in converging fashion from the tip portion to the nozzle and having a slope therebetween which varies relative to the central axis; means for introducing arc gas into the arc chamber between the tip portion of the cathode and the anode to provide an arc gas flow of at least four hundred SCFH, the means for introducing arc gas producing a stagnation pressure at a region of introduction of the arc gas which is at least three times greater than the static pressure; the plasma gun producing a plasma stream which exits the nozzle at a speed of at least about Mach 1.7988; and means for introducing spray material into the nozzle.