A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
HEAT TREATMENT METHOD OF SLURRY INFILTRATED FIBER PREFORM
A method of producing a melt infiltrated ceramic matrix composite (CMC) article that includes the steps of: forming a ceramic fiber preform; optionally, rigidizing the ceramic fiber preform with a fiber interphase coating via a Chemical Vapor Infiltration (CVI) process, infiltrating a ceramic slurry into the porous body or preform, conducting one or more secondary operations, and finally, melt infiltrating the preform with molten silicon or a silicon alloy to form the CMC article. The infiltration of a ceramic slurry into a ceramic fiber preform to form a green body is performed along with the use of convection and/or conduction as heat transfer mechanisms, such that the ceramic slurry does not require the incorporation of a pre-gelation material in order for the slurry to remain within the green body during subsequent processing steps. A method of forming a green body for use in making a CMC article is also disclosed, the method comprising:placing a fiber preform inside a pliable container (210A) having an internal volume and an external surface;infiltrating (32) a ceramic slurry into a fiber preform to form a wet infiltrated preform;creating (33) a pressure differential between the internal volume and the external surface of the pliable container, such that the ceramic slurry remains within the fiber preform;placing (34) the pliable container and wet infiltrated preform into a fluid bath (105, 105A) at ambient temperature;heating (35) the fluid bath to a predetermined hold temperature;maintaining (36) the fluid bath at the hold temperature for a predetermined time period, wherein the heat from the fluid bath is transferred to the wet infiltrated preform by convection, conduction, or a combination thereof, such that the wet infiltrated preform is transformed into the green body;removing (37) the pliable container from the fluid bath; andremoving (38) the green body from the pliable container. The pliable container is preferably a bag.
HEAT TREATMENT METHOD OF SLURRY INFILTRATED FIBER PREFORM
A method of producing a melt infiltrated ceramic matrix composite (CMC) article that includes the steps of: forming a ceramic fiber preform; optionally, rigidizing the ceramic fiber preform with a fiber interphase coating via a Chemical Vapor Infiltration (CVI) process, infiltrating a ceramic slurry into the porous body or preform, conducting one or more secondary operations, and finally, melt infiltrating the preform with molten silicon or a silicon alloy to form the CMC article. The infiltration of a ceramic slurry into a ceramic fiber preform to form a green body is performed along with the use of convection and/or conduction as heat transfer mechanisms, such that the ceramic slurry does not require the incorporation of a pre-gelation material in order for the slurry to remain within the green body during subsequent processing steps. A method of forming a green body for use in making a CMC article is also disclosed, the method comprising:placing a fiber preform inside a pliable container (210A) having an internal volume and an external surface;infiltrating (32) a ceramic slurry into a fiber preform to form a wet infiltrated preform;creating (33) a pressure differential between the internal volume and the external surface of the pliable container, such that the ceramic slurry remains within the fiber preform;placing (34) the pliable container and wet infiltrated preform into a fluid bath (105, 105A) at ambient temperature;heating (35) the fluid bath to a predetermined hold temperature;maintaining (36) the fluid bath at the hold temperature for a predetermined time period, wherein the heat from the fluid bath is transferred to the wet infiltrated preform by convection, conduction, or a combination thereof, such that the wet infiltrated preform is transformed into the green body;removing (37) the pliable container from the fluid bath; andremoving (38) the green body from the pliable container. The pliable container is preferably a bag.
HEAT TREATMENT METHOD OF SLURRY INFILTRATED FIBER PREFORM
VERFAHREN ZUR WÄRMEBEHANDLUNG VON MIT SCHLAMM INFILTRIERTEM FASERVORKÖRPER
PROCÉDÉ DE TRAITEMENT THERMIQUE D'UN CORPS DE FIBRES INFILTRÉ PAR UN BOUE
BORTOLUZZI CAMILA (author) / SHIM SUNGBO (author)
2024-03-20
Patent
Electronic Resource
English
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