Friction and wear properties of hard carbon films formed on cemented carbides by D.C. plasma chemical vapour deposition

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Abstract

Hard carbon film was formed on a cemented carbide substrate from CH4 gas using d.c. plasma chemical vapour deposition (CVD). The effects of added argon and hydrogen gases and electrode power on the deposition rate and the hardness of the film were investigated. The friction and wear properties of the coated carbides were measured using a block-on-rotating-ring sliding test with a FALEX I type tester. A film with a flat and very smooth surface was obtained at a deposition rate of between 0.2 and 1.4 μm h-1 according to the CVD conditions. From the Raman spectra the film was estimated to be mainly composed of graphite-like carbon; however, no crystalline structure was observed in the film using scanning electron microscopy. The coefficients of friction of the films were in the range 0.13 – 0.25 throughout dry sliding with hardened steel. Film with a high critical load in the scratch test generally showed better resistance to film flaking and wear. A film with a very stable low coefficient of friction and superior wear resistance without film flaking was obtained. The specific wear of this coated carbide was 123 of that of the uncoated carbides, and many antiwear applications can be expected.

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Paper presented at the 15th International Conference on Metallurgical Coatings, San Diego, CA, U.S.A., April 11 – 15, 1988.

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