Chemical vapour-deposition of aluminide coatings.

摘要

The present invention provides a method and apparatus for coating nickel based alloy articles with NiAl coatings and cobalt based alloy articles with CoAl coatings by generating an aluminum chloride gas mixture with increased levels of AlCl in a vapor generator at a first temperature Tl and flowing the resultant AlCl enriched aluminum chloride gases over the articles to be coated in a reactor at a second temperature T2 wherein T2 is at a substantially lower temperature than T1, having a difference of at least 25 DEG F and preferably about 150 DEG F. <IMAGE>