Platinum-modified cathodic arc coating

摘要

A process for coating a part comprises the steps of providing a chamber which is electrically connected as an anode, placing the part to be coated in the chamber, providing a cathode formed from a coating material to be deposited and platinum, and applying a current to the anode and the cathode to deposit the coating material and the platinum on the part.

主权项

1. A process for coating a turbine engine component comprising the steps of:
providing a chamber which is electrically connected solely as an anode; placing said turbine engine component to be coated in said chamber; providing a cathode formed from a first MCrAlY material to be deposited where M is selected from the group consisting of nickel, iron, and cobalt, and from a second material which is from 4.0 to 60 wt% platinum, said providing step including casting an ingot of said first MCrAlY material and electrically connecting said cast ingot as said cathode; applying a current in the range of from 300 to 500 amps from a first power supply to said anode and said cathode and applying a bias to the turbine engine component of −10V to −100V using a second power source to deposit said MCrAlY material and said second material on said turbine engine component; wherein said process comprises electrolytically plating at least one surface of said cast ingot with said second material prior to applying said current, wherein plating includes grading said platinum with a concentration greatest closest to the at least one surface and leanest away from said at least one surface; and wherein a heat treatment of the cast ingot is performed at a temperature in the range of from 1900 degrees Fahrenheit to 2000 degrees Fahrenheit for 3.5 to 5.0 hours to diffuse the platinum into the MCrAlY material.