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

Claim 0:
1. A thermal spray gun having improved nozzle life and operating performance comprising:
a cathode arranged inside a body of the thermal spray gun and having an arc emitting end;
a nozzle body that extends into and is removable from the body of the thermal spray gun;
a liner material arranged within the nozzle body and having an inside surface with an arc attachment zone, said inside surface defining an internal bore having a diameter, measured at an area of the arc attachment zone, larger than a diameter of the arc emitting end;
a material of the nozzle body having a lower melting temperature than that of the liner material;
an internal coolant receiving space surrounding a portion of the nozzle body and communicating with cooling channels in the body of the thermal spray gun;
a total wall thickness of the portion of the nozzle body and the liner material measured at an imaginary plane passing through the coolant receiving space and the arc attachment zone to that of a wall thickness of the liner material measured at the imaginary plane 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,
wherein the thermal spray gun is structured and arranged to apply a coating, and
wherein the ratio results in a reduction of thermal stresses and a reduced potential for cracking in the arc attachment zone.