Coating processes – Direct application of electrical – magnetic – wave – or... – Pretreatment of substrate or post-treatment of coated substrate
Patent
1996-12-11
1997-12-16
King, Roy V.
Coating processes
Direct application of electrical, magnetic, wave, or...
Pretreatment of substrate or post-treatment of coated substrate
427553, 427249, B05D 306
Patent
active
056982720
ABSTRACT:
An improved method for the lubrication of diamond-like carbon surfaces comprises condensing a layer of perflourinated alkyl halides of the formula C.sub.n F.sub.2n+1 X, wherein n is a positive integer from 1 to 13 and X is selected from I, Br and Cl, on the diamond-like carbon surface. Perflourinated alkyl free radicals are then produced by photodecomposing C--X bonds of said perflourinated alkyl halides on the surface. The diamond-like carbon surface is reacted with photochemically produced perflourinated alkyl radicals thereby anchoring photochemically induced photofragments of the perflourinated alkyl halides to the surface forming a perflourinated alkyl layer. The perfluorinated alkyl layer is preferably decomposed on the diamond-like carbon surface to cause the fluorination of the surface by atomic F. The method preferably achieves greater than one fluorine atom per surface carbon atom chemisorbed on the diamond-like carbon. The fluorination process produces lubricated diamond-like carbon surfaces that are particularly suitable for computer hard disks.
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Smentkowski Vincent S.
Yates, Jr. John T.
King Roy V.
Silverman Arnold B.
Towner Alan G.
University of Pittsburgh of the Commonwealth System of Higher Ed
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