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Energy conversion device and method of reducing friction therein

United States Patent

October 8, 2013
View the Complete Patent at the US Patent & Trademark Office
A device configured for converting energy includes a first surface, a second surface configured for moving with respect to the first surface during operation of the device, and a coating disposed on at least one of the first surface and the second surface. The coating includes a first layer of a ceramic alloy represented by the general formula AlMgB.sub.14--X, wherein X is present in an amount of from 0 to 70 parts by weight based on 100 parts by weight of the ceramic alloy and is a doping agent selected from the group of Group IV elements and borides and nitrides thereof, and a second layer disposed on the first layer and including carbon in a gradient concentration. The coating has a hardness of from 10 to 20 GPa and a coefficient of friction of less than or equal to 0.12.
Solovyeva; Lyudmila Mikhaylovna (Ann Arbor, MI), Jansson; Kyle S. (St. Louis Park, MN), Elmoursi; Alaa AbdelAzim (Troy, MI), Zhu; Dong (Farmington Hills, MI), Milner; Robert (Warren, MI), Daugherty; Earl Eugene (Greenwood, SC), Higdon; Clifton Baxter (Birmingham, MI), Elagamy; Kamel Abdel-Khalik (Livonia, MI), Hicks; Aaron Michael (Eden Prairie, MN)
Eaton Corporation (Cleveland, OH)
12/ 493,885
June 29, 2009
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The invention described herein was made in the course of research under Department of Energy Grant No. DE-FG36-06GO16054. The federal government may have certain rights in the invention.