Abstract: A process for the coating of a carbon fiber composite which comprises carbon fibers bonded together with a polymeric material, which process comprises positioning the carbon fibre composite in a chamber maintained at a reduced pressure of from 25,000 to 10,000 Pa (250 to 100 mBar), and plasma spraying a coating onto a surface of the carbon fiber composite whilst cooling the said surface of the composite with an inert liquid coolant medium the said coating composition being selected from the group consisting of non-agglomerated hydroxyapatite or non-agglomerated modified hydroxyapatite.

Abstract: In a continuous coating method, a coating material with insufficient fluidity can be uniformly coated on a substrate. A pick-up roller is disposed between a coating roller and a metering roller and a doctor bar is located above the pick-up roller. The coating roller is located near the substrate. The pick-up roller is rotated in a direction to pick-up the coating material through a gap between the pick-up roller and the metering roller. The metering roller is rotated in the same direction as the pick-up roller at a nip of these rollers, and the coating roller is rotated in a reverse direction with respect to the pick-up roller at a nip of these rollers. The substrate travels in a reverse direction with respect to the coating roller at a nip thereof.