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Abstract

A fluidized bed pyrolytic carbon coating apparatus (1) is provided for coating substrate surfaces with pyrolytic carbon. The preferred coating apparatus (1) includes a fluidized bed reactor (10) having a reactor chamber (22), a gas feed inlet (24), an exhaust gas outlet (26), a source (12) of process feed gas and a gas line (14) through which the process feed gas can pass from the source (12) of process feed gas to the gas feed inlet (24) and into the reactor chamber (22). The gas line (14) includes an actuator (20) having a timing circuit (37) which acts to vary a rate of flow of process feed gas through the gas line (14) into the reactor chamber (22) such that the rate of flow into the reactor chamber (22), cycles regularly and consistently over a period of time so as to create a pulsating gas flow and a pulsation effect upon the fluidized bed within the reactor chamber (22).

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First Claim