PROPERTIES OF CARBONISATION LAYERS RELEVANT TO PLSMA SURFACE INTERACTIONS
Thin carbonaceous films have been prepared on samples of stainless steel, Inconel 600, Inconel 625 and silicon by carbonization from CH-4-H-2 mixtures. They were investigated by transmission electron microscopy, nuclear reaction and backscattering techniques and thermal desorption. The films are semi-transparent, amorphous and homogeneous down to sim10 AA. Their composition is H/C = 0.4 pm 0.1 and independent of the substrate. The density is 1.4 g cm"-3", the average C- C atomic distance sim2.5 AA. The films release H-2 and about 3--10% CH-4 upon heating. The desorption CH-4 occurs in a well defined peak around 500circC, whereas H-2 is released up to 1100circC. The films turn black in colour after the CH-4 has been released, possibly due to a transformation from the initial amorphous into a graphitic structure.
Bibliographic Reference: NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH, VOL. B23, PP 538-543, 1987
Record Number: 1989126085800 / Last updated on: 1989-05-01
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