Patent ID: 7572345
Filing Date: 2009-08-11
Classification: C23C,C25D

Abstract:
1. A method for treating a metallic substrate surface containing chromium having a virgin coefficient of friction, comprising: positioning the metallic substrate in a vacuum chamber that is evaluated to a base pressure of 10 supplying a source of additive compound to be ionized wherein said additive compound has the formula: wherein n is from 0 to 6, m is from 1-2 and o is from 1-2, H is hydrogen, C is carbon and X is selected from the group consisting of fluorine, oxygen and sulfur; forming a beam of ions of said additive compound and bombarding said substrate with said ions wherein said ions penetrate at least 50 nm from said metallic substrate surface; reducing said virgin coefficient of friction of said metallic substrate surface to a value of 0.3 or less as measured against a steel counterface at a load of 100 MPa, wherein said metallic substrate surface also indicates a hardness of 15 GPa or more.