Patent ID: 11891702
Assignee: OERLIKON METCO (US) INC.
Field: Chemical engineering (Chemistry)
Classification: CPC C  H  Y | IPC C  H

Claim 5:
6. A plasma coating nozzle having improved nozzle life and operating performance for a thermal spray gun comprising:
a coating nozzle body that is configured to extend into and be removable from a body of the thermal spray gun;
a liner material arranged within the nozzle body and comprising an inside surface having an arc attachment zone;
said inside surface defining an internal bore having a diameter that, when the coating nozzle body is installed so as to extend inside the thermal spray gun, is configured to be larger, in an area of the arc attachment zone, than a diameter of an arc emitting end of a cathode of the thermal spray gun;
an internal liquid coolant receiving space surrounding a portion of the nozzle body and a portion of the arc attachment zone, said coolant receiving space being configured to communicate with cooling channels located inside the body of the thermal spray gun;
a material of the nozzle body having a lower melting temperature than that of the liner material; and
a total wall thickness, measured in a cross-sectional area of the arc attachment zone, of the portion of the nozzle body and a portion of the liner material to that of a wall thickness of the liner material defining a ratio,
wherein the liner material is made of a Lanthanated Tungsten and the ratio being between about 4.75:1 and about 5.75:1; and
wherein the ratio results in a reduction of thermal stresses and a reduced potential for cracking in the arc attachment zone.