Abstract
In this paper, the new method for coating the inner wall of ultrahigh-vacuum (UHV) materials with highly oriented graphite layers that precipitate on the surface of a carbon-doped CuNi substrate is proposed. CuNi alloy is suitable for electron spectroscopy equipment because CuNi alloy that contain less than 43 at% of Ni is not ferromagnetic even at OK.In this letter, we will report the first observation of graphite layers precipitation on the surface of a C-doped CuNi alloy (Constantan) instead of Ni.By using a scanning Auger microprobe, characterization of the precipitated graphite has been performed. AES measurements for various annealing temperatures showed the surface precipitation process on polycrystalline C-doped CuNi. AES measurements after exposure to an atmospheric air showed that the graphite-covered surface was hardly oxidized by prolonged air exposure.From the standpoint of applications in engineering, graphite precipitation on CuNi is found to be a promising method for fabrication of an inert and low-outgassing surface for UHV uses.
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