Patent ID: 7135238
Filing Date: 2006-11-14
Classification: C23C,Y10S,Y10T

Abstract:
1. A coated substrate prepared according to a process comprising the steps of: a) depositing an aluminum conversion layer on a surface of a titanium-based substrate; b) oxidizing a first portion of the aluminum conversion layer to form an outer alumina layer; and c) diffusing a second portion of the aluminum conversion layer into the titanium-based substrate, wherein a titanium aluminide layer is formed beneath the alumina layer and a diffusion layer is formed between the titanium aluminide layer and the substrate, and wherein: step b) is performed at a first temperature, step c) is performed at a second temperature, the second temperature substantially higher than the first temperature but lower than the melting temperature of aluminum, and a thickness of the diffusion layer, the titanium aluminide and the outer alumina layer is about 10 micron or less.