| http://www.w3.org/ns/prov#value | - It is preferable to use as the protective layer a carbon film added with hydrogen, a film made of compound such as silicon carbide, tungsten carbide, (W???MO)???C and (Zr???Nb)???N, or a film made of a mixture of such compound and carbon, because the slide resistance and corrosion resistance can be improved.
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