With an inorganic chemically resistant hydrophobic oil and ending in schmierfaehigen poly carbon fluoride of the formula cf deep n by means of solid carbon parts.

摘要

Carbon articles, for example carbon-impregnated packing or sealing rings, bearings, electrodes and brushes, or powdered graphite, are treated, without preheating, with fluorine or a fluorine compound at below 550 DEG C. to form a surface layer of polycarbon fluoride of formula (CF)n covalently bonded to the substrate. The fluorine compound may be a halogen fluoride or metal fluoride or a mixture of fluorine and halogen fluoride may be used. An inert diluent gas may also be present. The fluorine may be obtained by electrolysis of potassium hydrogen fluoride, and used without purification to remove HF.