Gm Global Technolgoy Operations, Inc.

Blake P Wood

Joseph V Mantese

Gerard Wladyslaw Malaczynski

Alaa AbdelAzim Elmoursi

Michael A Nastasi

Aboud H Hamdi

Kevin C Walter

Xiaohong Qiu

A process for forming an adherent diamond-like carbon coating on a workpiece of suitable material such as an aluminum alloy is disclosed. The workpiece is successively immersed in different plasma atmospheres and subjected to short duration, high voltage, negative electrical potential pulses or constant negative electrical potentials or the like so as to clean the surface of oxygen atoms, implant carbon atoms into the surface of the alloy to form carbide compounds while codepositing a carbonaceous layer on the surface, bombard and remove the carbonaceous layer, and to thereafter deposit a generally amorphous hydrogen-containing carbon layer on the surface of the article.

Process for the formation of wear- and scuff-resistant carbon coatings

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Los Alamos, NM, United States of America

Blake P Wood