Plasma spray nozzle with internal injection

摘要

A plasma spray nozzle is provided. Owing to their high degree of wear, previous plasma spray nozzles were not suitable for the coating of components for which long coating times were necessary. The coating times may be reduced considerably by the triple injection of powder into the inner channel through the plasma spray nozzle.

主权项

1. A plasma spray nozzle, comprising:
an inner channel including a first end and a second end which is downstream from the first end; and a powder injection hole, wherein the inner channel includes a divergent region at the second end, and wherein the powder injection hole is not arranged in the divergent region, wherein the inner channel consists of the divergent region and a region with a constant cross section, wherein the divergent region includes a first end which is disposed where in the inner channel starts to diverge and a second end which coincides with the second end of the inner channel, wherein the plasma spray nozzle includes a shoulder at the first end of the divergent region configured to guide plasma toward the inner channel, wherein the powder injection hole is arranged close to the first end of the inner channel opposite from the divergent region, and wherein a first outer diameter of the plasma spray nozzle at the second end of the divergent region is less than a second outer diameter at the first end of the inner channel.