Abstract
We have studied the condition for self-sustaining coating, under which coverage with segregated carbon layer protects a nickel layer deposited on graphite from ion-induced sputtering. Both the concentration and the sputtered flux of carbon atoms segregated onto the bombarded surface of the nickel layer from the graphite underlayer are calculated as a function of ion flux, utilizing a theoretical model which has been developed for analysis of the preferential sputtering of alloys. It is shown that the condition for self-sustaining coating depends on the diffusion constant and the rate constant of segregation to the bombarded surface. The calculated results are compared with the experimental results of the ion-flux dependence of the sputtered fluxes of nickel and carbon atoms and the rate of segregation for the nickel-carbon system is obtained to be 57 s−1 at 650°C and 1.2 s−1' at 600°C. Using the obtained value, the critical thickness of the nickel layer for a self-sustaining coating is evaluated to be of the order of 10−2 cm.
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