The composite component by the density of the preform containing at least one metal that need to while significantly reduced processing time [Problems] cost, carbon fiber preform, removing particular by chemical vapor infiltration to provide a method and apparatus can be obtained. While continuously discharging the effluent gas through a first effluent outlet while sweeping with an inert gas [SOLUTION] under reduced pressure, and was connected to the effluent exhaust circuit and (40), enclosure (11) performing a heat treatment preform was placed. The interrupts that after heat treatment, by closing the first effluent gas outlet, it is isolated from the enclosure effluent exhaust circuit to sweep the enclosure with an inert gas, leaving the enclosure preform is heat treated, and opened to the enclosure By introducing the reagent gas into the enclosure via the reagent gas inlet duct of one (32) at least is to densify the preform, and a second effluent outlet separate from the first effluent outlet, the effluent gas It is discharged through (60). I closed during the heat treatment step, the second outlet. The preferred metal contained in the effluent gas discharged from the enclosure during the heat treatment step, is to neutralize the sodium in particular.
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