Wear and T.E.M. Studies of P.E.C.V.D. Diamond-like-Carbon Films

Diamond-like-carbon (D.L.C.) films are characterized by a low friction coefficient, a high wear resistance and a high corrosion resistance. D.L.C. films can be obtained by P.V.D., C.V.D. and duplex techniques with solid or gaseous precursors. Depending on the processing, hydrogen concentration ranges between 0 and 60%

In this study, hydrogenated D.L.C. has been deposited with a radio frequency system (13.56 MHz) onto a steel substrate. Wear was studied by pin-on-disc testing at room temperature with an alumina counterpart. Interrupted tests were carried out to go into wear mechanisms. Debris were collected after various given sliding times for transmission electron microscopy (T.E.M.) in addition to scanning electron microscopy (S.E.M.) applied to the wear tracks.     

Monitoring the E.D.M. process by radio signals

Experimental studies are described to show that high-frequency radio observations provide a simple way to monitor the E.D.M. process and to distinguish between the effective spark and arc discharges. The paper also describes how radio frequency emitted during machining could be used to optimize the E.D.M. process.

It was found that radiation from the region of the gap between the electrode (tool) and the workpiece are significantly different when the following conditions occur: open voltage, sparking (effective machining), arcing and short circuit. However, a reliable technique was developed to monitor the rate of metal removal and machining efficiency during the E.D.M. process     

Colloque International RILEM-A.B.E.M.

Sans résumé

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RILEM-A.B.E.M. International Symposium Brussels, August 30th–September 1st 1967

     

On the occasion of the seventieth birthday of professor V. M. Skorikov

Chronicle

On the occasion of the seventieth birthday of professor V. M. Skorikov     

A modification of the iteration method of M. E. Shvets

A modification of the well-known method of M. E. Shvets [1, 2] is proposed, whereupon the method becomes iterational — interpolational.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 19, No. 1, pp. 84–93, July, 1970.     

On M. Kunz's article “A case study against Haitun's conjectures”

M.Kunz's criticism of the concept of non-Gaussian nature of scientific activities is discussed. The following points of the concept are analyzed: transformations of closed scales into open scales, the dependence of moments of non-Gaussian distributions on the samples size, the non-Gaussian nature of Man-dwelt upon byKunz. Arguments based on statistical analysis of Kunz's article are put forward againstKunz.