Patent ID: 6537605
Filing Date: 2003-03-25
Classification: C23C

Abstract:
A method for coating a component by means of plasma spraying comprising the steps of:(a) heating the component; (b) determining a distribution of the thermal radiation of a surface region of the component with the aid of an infrared camera, said method having a method parameter (p) that said distribution is a function of; whereby the parameter (p) is at least one out of an arc current (i) of the arc discharge of a plasma jet of a plasma spraying apparatus used for the plasma spraying, a voltage between electrodes, an emission of electrons from a cathode, a gas pressure, a gas flow, a gas mixture, a burner geometry, powder parameters of material to be coated, a carrier gas flow, an injection geometry, a spraying distance, the duration (tu) of a revolution of the component, a position of the component or a rotation axis of the component;(c) determining the temperature distribution of the surface region from the thermal radiation distribution of the surface region of the component by comparison with the thermal radiation distribution of a radiation reference means, which is arranged inside a plasma spraying apparatus used for this method; (d) setting the method parameter (p) in accordance with the temperature distribution in order to reach a prescribed threshold temperature (TS) in the surface region; and, (e) plasma spraying the coating onto the component.