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Structural factors in the deposition of carbon on nickel

✍ Scribed by C. Bernardo; D.L. Trimm

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
546 KB
Volume
14
Category
Article
ISSN
0008-6223

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✦ Synopsis

The effect of surface irregularities, grain boundaries and crystal orientation have been studied for the formation of carbon on nickel from acetylene at low pressures and at temperatures between 450 and 600Β°C. Carbon formation is greatly enhanced if the surface is rough and if there are gram boundaries present: this has been explained in terms of a previously suggested mechanism of carbon formation which involves separation of nickel particles from the original sample. In contrast to previous results, the rate of carbon formation on clean surfaces has been found to be greater on a (I IO) face than on a (I I I) face. However, as carbon formation builds up-and becomes dependent on nickel particles separated from the single crystal-this order is reversed. If the same carbon supersaturation is maintained in both crystal faces, a more ordered laminar graphite is obtained on the (111) face by a dissolution-precipitation process.

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