Patent ID: 6083330
Filing Date: 2000-07-04
Classification: C23C

Abstract:
A process for forming a high quality, high ductility metallurgically bonded coating on a substrate comprising the steps of:applying a coating to said substrate using a thermal spray coating technique;subjecting said coating substrate to a stepped heat treatment for diffusing said coating into said substrate while substantially avoiding the formation of macro cracks;said stepped heat treatment comprising slowly heating said coated substrate to a temperature of up to about 1400.degree. F. in multiple steps; andsaid stepped heat treatment having a first stage comprising placing said coated substrate in a furnace at a temperature less than about 500.degree. F., heating said coating substrate to a temperature of about 500.degree. F. in a time no less than about 30 minutes, and holding said coated substrate at a temperature of about 500.degree. F. for about 30 minutes.