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Process for forming a chromium diffusion portion and articles made therefrom

United States Patent

September 11, 2012
View the Complete Patent at the US Patent & Trademark Office
In one embodiment, a method for forming an article with a diffusion portion comprises: forming a slurry comprising chromium and silicon, applying the slurry to the article, and heating the article to a sufficient temperature and for a sufficient period of time to diffuse chromium and silicon into the article and form a diffusion portion comprising silicon and a microstructure comprising .alpha.-chromium. In one embodiment, a gas turbine component comprises: a superalloy and a diffusion portion having a depth of less than or equal to 60 .mu.m measured from the superalloy surface into the gas turbine component. The diffusion portion has a diffusion surface having a microstructure comprising greater than or equal to 40% by volume .alpha.-chromium.
Helmick; David Andrew (Fountain Inn, SC), Cavanaugh; Dennis William (Simpsonville, SC), Feng; Ganjiang (Greenville, SC), Bucci; David Vincent (Simpsonville, SC)
General Electric Company (Schenectady, NY)
11/ 696,385
April 4, 2007
U.S. GOVERNMENT INTEREST This invention was made with government support under Contract No. DE-FC26-05NT42643 awarded by the U.S. Department of Energy. The government has certain rights in the invention.