| 摘要 |
A fluidized bed apparatus (10) which produces a pyrolytic carbon coating with improved wear and porosity characteristics of the coating by producing a more uniform flat temperature profile (66) throughout a reaction chamber (16) in the area where coating is taking place. The apparatus has heating coils (46) surrounding a lower end of the reaction chamber placed immediately adjacent one another at tight spacing. This contrasts to previous apparatus wherein heating coils were spaced between 2 cm and 5 cm apart. The apparatus also has a multi-jet nozzle (48) to control a flow of gases through the reaction chamber. The jets (54) in the nozzle comprise passages (58) which are oriented such that the length of the passages lie on a series of cones (62, 64) having common axes (56).
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