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Device for high-temperature heat treatment and densification by chemical infiltration of carbon texture in a steam phase
Device for high-temperature heat treatment and densification by chemical infiltration of carbon texture in a steam phase
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机译：通过蒸汽相中碳织构的化学渗透进行高温热处理和致密化的装置
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摘要
Carbon preforms are subjected to high temperature heat treatment and to densification by: (i) subjecting preforms in enclosure to heat treatment while sweeping the enclosure with inert gas under low pressure; (ii) continuously extracting gaseous effluent; (iii) interrupting sweeping of the enclosure with inert gas; and (iv) leaving the heat-treated preforms in the enclosure and subjecting them to densification by admitting a reagent gas to the enclosure. Subjecting carbon preforms to high temperature heat treatment and to densification comprises: (a) placing the carbon fiber preforms in an enclosure; (b) subjecting the preforms in the enclosure to heat treatment while sweeping the enclosure with inert gas under low pressure; (c) during the heat treatment, continuously extracting gaseous effluent through a first effluent outlet connected to a effluent exhaust circuit; (d) at the end of heat treatment, closing the first gas effluent outlet to isolate the effluent exhaust circuit from the enclosure; (e) interrupting sweeping of the enclosure with inert gas; and (f) leaving the heat-treated preforms in the enclosure and subjecting them to densification by admitting a reagent gas to the enclosure through a reagent gas admission duct(s) (26) opening out into the enclosure, gaseous effluent being extracted through a second effluent outlet distinct from the first, the second outlet being closed during the heat treatment step. An independent claim is also included for an installation for subjecting carbon fiber preforms to high temperature heat treatment and to densification comprising an enclosure, enclosure heating mechanism, inlet(s) (30) for admitting an inert sweeping gas to the enclosure, a first outlet for exhausting gaseous effluent from the enclosure, and a first effluent exhaust circuit comprising an effluent exhaust pipe (42) connected to the first gaseous effluent outlet. The installation further comprises a reagent gas admission duct(s) opening out into the enclosure, a second outlet for exhausting gaseous effluent from the enclosure, a second effluent exhaust circuit connected to the second gaseous effluent outlet, a valve (46) for isolating the first effluent exhaust circuit from the enclosure, and a valve (48) for isolating the second effluent exhaust circuit from the enclosure.
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