EP2118039A1 - Procédé de fabrication d'un composant en céramique carbonée renforcé avec des fibres et d'un composant en céramique carbonée - Google Patents

Procédé de fabrication d'un composant en céramique carbonée renforcé avec des fibres et d'un composant en céramique carbonée

Info

Publication number
EP2118039A1
EP2118039A1 EP08708423A EP08708423A EP2118039A1 EP 2118039 A1 EP2118039 A1 EP 2118039A1 EP 08708423 A EP08708423 A EP 08708423A EP 08708423 A EP08708423 A EP 08708423A EP 2118039 A1 EP2118039 A1 EP 2118039A1
Authority
EP
European Patent Office
Prior art keywords
fiber
unidirectional
produced
pyrolysis
carbide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08708423A
Other languages
German (de)
English (en)
Inventor
Bodo Benitsch
Bernhard Heidenreich
Christian Zuber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsches Zentrum fuer Luft und Raumfahrt eV
SGL Carbon SE
Original Assignee
Deutsches Zentrum fuer Luft und Raumfahrt eV
SGL Carbon SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsches Zentrum fuer Luft und Raumfahrt eV, SGL Carbon SE filed Critical Deutsches Zentrum fuer Luft und Raumfahrt eV
Publication of EP2118039A1 publication Critical patent/EP2118039A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
    • C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
    • C04B35/80—Fibres, filaments, whiskers, platelets, or the like
    • C04B35/83—Carbon fibres in a carbon matrix
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5252—Fibers having a specific pre-form
    • C04B2235/5256—Two-dimensional, e.g. woven structures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5268—Orientation of the fibers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6562—Heating rate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6565—Cooling rate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2926—Coated or impregnated inorganic fiber fabric
    • Y10T442/2984—Coated or impregnated carbon or carbonaceous fiber fabric
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3472—Woven fabric including an additional woven fabric layer
    • Y10T442/3528—Three or more fabric layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3976—Including strand which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous composition, water solubility, heat shrinkability, etc.]

Definitions

  • the invention relates to a method for producing a fiber-reinforced carbide ceramic component, wherein a carbon body is produced by using at least one unidirectional gel by pyrolysis.
  • the invention further relates to a carbide ceramic component.
  • Carbide-ceramic components produced by means of unidirectional (UD) layers have, in principle, the advantage that they are stiff and have low expansion. They can therefore be used for load-bearing structures. They can have a high strength. Due to the high rigidity and strength, they can be made thin, so that a lightweight construction is feasible.
  • the invention has for its object to provide a method for producing a fiber-reinforced carbide ceramic component, wherein the component UD fiber is reinforced.
  • the at least one unidirectional scrim coated with a coating material is, which is volatile in the pyrolysis and / or the at least one unidirectional scrim has a transverse thread system with transverse threads of a volatile in the pyrolysis material.
  • the pyrolysis dissolves the coating material. This results in cavities which ensure that the carbide-forming infiltration is improved. As a result, channels can also be formed on the unidirectional scrim through which carbide formers can flow in the carbide-former infiltration.
  • the coating material facilitates carbide-former infiltration (for example, with liquid silicon).
  • the coating material may cover the entire surface of the at least one unidirectional layer or a part (for example, the major part) of the total surface.
  • the at least one unidirectional scrim has a transverse thread system with transverse threads of a material which is volatile during the pyrolysis.
  • the transverse threads are not parallel to the fiber rovings which form the layers of the unidirectional gel. They cut these fiber rovings geometrically, i. are at an angle greater than 0 ° and less than 180 ° to these. These transverse threads form by their resolution in the pyrolysis cavities and / or channels for the Carbidrelinerinfiltration.
  • uncontrolled crack formation can be prevented during pyrolysis via the transverse threads.
  • the transverse surfaces cause shrinkage restriction within UD layers perpendicular to the fiber orientation. This promotes the formation of a uniform crack system. This in turn promotes uniform carbide-former infiltration.
  • unidirectional scrims are manageable and they are cut to transportable layers. Furthermore, prepregs can be easily produced by means of a transverse thread system. It is a processing, for example, with wet lamination, resin infiltration, pressing technique, Autoklavon and the like with little or no delay of unidirectional fibers possible.
  • the (at least partially) fiber-reinforced carbide ceramic component is produced with at least one UD fiber reinforcement layer. It can thereby produce a rigid component, which is low-expansion.
  • the component can be with high strength adapted to the later stress it will experience. It can still be produced with high damage tolerance. It can thereby be used, for example, for supporting structures even with thinner version.
  • the coating material is a resin material such as epoxy resin.
  • Other coating materials such as thermoplastic coating materials are also possible.
  • the coating material is substantially residue-free during pyrolysis.
  • the at least one unidirectional scrim is a system of at least approximately parallel fiber rovings.
  • the fiber rovings (fiber strands or fiber bundles) are composed of fiberfiblings.
  • transverse threads are formed so that they dissolve substantially free of residue during pyrolysis.
  • transverse filaments of the transverse filament system can be joined to fiber rovings of the unidirectional sheeting and / or fixed to fiber rovings and / or held on fiber rovings.
  • transverse threads are fixed via loops on fiber rovings of the at least one unidirectional layer.
  • they may also be woven or sewn to the fiber rovings of the at least one unidirectional fabric. This can prevent uncontrolled cracking during pyrolysis.
  • the carbon body is produced by means of the at least one unidirectional layer and at least one fiber fabric and / or fiber knitted fabric and / or nonwoven fabric.
  • the insertion of fiber fabrics / fiber fabrics / nonwovens produces a defined microcrack structure with a uniform crack system. This results in a damage-tolerant material behavior of a carbide-ceramic component produced.
  • the microcrack structure is composed of translaminar channels, dense C / C bundles (C / C means coal embedded in a carbon matrix). fabric fibers) and capillaries which are oriented parallel to unidirectional fiber layers.
  • the fiber layers between unidirectional fiber rovings result in shrinkage restriction perpendicular to the non-directional orientation. This makes it possible to produce a crack structure with a uniform crack pattern.
  • the carbon body is produced with a plurality of fiber reinforcement layers, wherein at least one fiber reinforcement layer is a UD fiber reinforcement layer and at least one fiber reinforcement layer is a fiber fabric layer or fiber fabric layer or nonwoven fabric layer.
  • the UD fiber reinforcement layer gives the component high rigidity and strength, even with a thin design.
  • the at least one further fiber reinforcement layer of a "two-dimensional" fiber structure results in a homogeneous microstructure during production.
  • the at least one fiber fabric and / or fiber knitted fabric is a 0790 ° structure with regard to the orientation of fiber rovings.
  • a microcrack structure during pyrolysis can be generated in a defined manner, which in turn leads to the formation of a homogeneous microstructure in the carbide-ceramic component.
  • Other orientations than 0790 ° are possible in the structure.
  • the carbon body is produced by means of alternating construction of UD-laid and fiber fabrics or fiber knits or nonwoven fabrics.
  • a unidirectional scrim is disposed between adjacent fiber fabrics or fiber fabrics or fiber webs. This allows a homogeneous microstructure to be achieved.
  • a green body is made using the at least one unidirectional scrim and a matrix material, and the green body is then pyrolyzed.
  • the green body is produced.
  • a carbon body and in particular C / C body is produced.
  • Carbide-forming infiltration, such as by siliciding produces a carbide-ceramic body, such as a C / C-SiC body.
  • the green body is produced in an autoclave and / or by pressing and / or by wet lamination and / or by a resin infiltration process.
  • an initial body is made using the at least one unidirectional web and a matrix material, and the starting body is pyrolyzed in the uncured state of the matrix material.
  • a corresponding method is described in EP 1 547 992 A1.
  • the carbon body can thereby be produced in a shorter process time.
  • the pyrolysis of the matrix material leads to bubble formation in a unidirectional fiber layer, in particular at high heating rates, so that further cavities are provided for the carbide-forming infiltration.
  • the starting body is produced by means of prepreg material.
  • the UD scrims used and fiber fabrics / fiber knitted fabrics / fiber webs are impregnated with matrix material.
  • the starting body it is also possible for the starting body to be produced by wet lamination.
  • the pyrolysis is carried out in one or more cycles and in particular heating cycles and cooling cycles.
  • the cycles are adjusted with respect to temperature profile and time duration, an optimized carbon body can be produced.
  • the matrix material is a resin, for example a polymer resin.
  • the resin can be converted into carbon.
  • the polymer resin is especially a phenol-based resin.
  • the at least one unidirectional scrim comprises carbon fibers.
  • Correspondingly used fiber fabrics / fiber knits / nonwovens may also comprise carbon fibers. It is then possible, for example, to produce a C / C-SiC component with UD fiber reinforcement.
  • the carbide former is especially silicon. However, it is also possible to use other carbide-forming materials, such as, for example, tungsten or titanium.
  • the ceramization of the carbon takes place by means of infiltration of liquid carbide formers.
  • This allows carbide ceramic components with favorable properties produce.
  • the ceramization takes place according to the known LSI method (liquid silicon infiltration).
  • the LSI process is a melt phase infiltration process.
  • the invention is further based on the object to provide a carbide ceramic component with unidirectional fiber reinforcement.
  • the device according to the invention comprises at least one unidirectional fiber reinforcement ply having a microstructure with dense C / C regions in the at least one unidirectional fiber reinforcement ply.
  • the component has a high tensile and compressive strength and high flexural strength. It can be made thin with high rigidity and low expansion.
  • the component has at least one fiber fabric layer and / or fiber knitted layer and / or nonwoven fabric layer as fiber reinforcement layer.
  • the component can be produced with a homogeneous microstructure. This, in turn, makes it possible to achieve a damage-tolerant material behavior.
  • the component includes alternating unidirectional fiber reinforcement layers and fibrous fabric layers / fiber fabric layers / nonwoven fabric layers. This allows a homogeneous microstructure to be achieved.
  • the C / C regions are composed of dense bundles of carbon fiber filaments embedded in a matrix of carbon.
  • Figure 1 is a schematic representation of an exemplary embodiment of a
  • FIG. 2 shows a SEM image of a first sample magnified 35 times
  • FIG. 3 shows a SEM image of a second sample magnified 35 times
  • Carbide ceramic components are usually produced by ceramifying a carbon body produced by pyrolysis by means of a carbide former material.
  • a carbide former material is silicon.
  • the manufactured component is then a silicon carbide ceramic component based on a non-oxide ceramic.
  • the manufactured component is a C / C-SiC component.
  • the component can be produced from a ceramic fiber composite material (CMC - Ceramic Matrix Composite). In the ceramic matrix, fibers such as carbon fibers are embedded.
  • the carbon body is produced by pyrolysis of an initial body. This is produced by means of fibers and a matrix material such as, for example, a polymer resin (plastic):
  • a carbon body (C / C body) is produced by pyrolysis from an output body made of carbon fibers reinforced plastic (CFRP).
  • a unidirectional scrim 10 comprises a plurality of at least approximately parallel fiber rovings 12a, 12b, 12c, etc.
  • the fiber rovings are each bundles of fiber filaments.
  • the fiber rovings can be spaced parallel or even close to each other. These fibers are for example carbon fibers.
  • the one or more unidirectional scrims 10 used are completely or partially coated on both sides, in particular, with a material that is volatile during pyrolysis, and in particular with resin material.
  • a material that is volatile during pyrolysis for example, an epoxy resin is used as a coating.
  • the material for the coating is chosen so that the coating material is substantially residue-free during pyrolysis.
  • the coating can be, for example, a powdering.
  • the at least one unidirectional scrim 10 is provided with a transverse thread system 14.
  • transverse threads 16 are fixed on fiber rovings 12a, 12b, 12c.
  • the transverse threads 16 are fixed to individual fiber rovings, for example by looping or by penetration.
  • the transverse threads 16 of the transverse thread system 14 are sewn or interwoven, for example, on the fiber rovings.
  • the transverse threads 16 are made of a material and in particular a plastic material, which is also volatile in the pyrolysis.
  • the material of the transverse threads 16 in the pyrolysis is substantially residue-free.
  • An initial body is first produced by means of matrix material and the at least one unidirectional scrim.
  • the fiber content in the starting body alone in the at least one unidirectional scrim 10 or the additional fiber or fiber fabric or fiber webs are used to form "two-dimensional" Faserverstärkungslagen, each having fiber rovings in a different orientation
  • fiber fabrics are additionally used which have fiber rovings in a 0 ° / 90 ° orientation, that is, comprise fiber rovings in a first group, which are substantially parallel spaced apart from each other, and in a second group, which are also substantially parallel spaced from each other wherein the fiber rovings of the first group and the second group are substantially perpendicular to each other.
  • the fiber rovings of the first group and the second group can be arranged for example in a plain weave.
  • the fibers are for example carbon fibers. It can then be provided several fiber layers. For example, an alternating sequence of fabric layers and unidirectional layers 10 is provided.
  • a CFRP green body is produced from the starting body by thermal curing of the matrix material.
  • the curing takes place in autoclave technology, in which the matrix material is cured in a gas-tightly sealed pressure vessel.
  • the CFRP green body can also be produced, for example, by a resin infiltration process such as RTM (resin transfer molding), by hot pressing or by wet lamination.
  • RTM resin transfer molding
  • the green body thus produced is then pyrolyzed for carbon conversion at high temperatures (in particular above 1600 0 C).
  • the starting body is also possible in principle for the starting body to be directly pyrolyzed without prior final curing of the resin material.
  • prepreg materials are used (UD scrim 10 and / or fiber fabric / fiber knitted fabric / fiber webs), which are impregnated with a curable matrix material (in particular resin material). Without preparation of a green body, the starting body is directly pyrolyzed.
  • this direct pyrolysis it is provided in particular that several heating cycles (furnace cycles) are performed. For example, there is a nine hours long heating from 20 0 C to 900 0 C, then a seven-hour heating of 100 0 C to 1650 0 C, a 0.5 hour long maintenance at a temperature of 1650 0 C, then a two-hour long cooling cycle from 1650 0 C to 1000 0 C and a twelve-hour cooling cycle from 1000 0 C to 20 0 C.
  • the direct pyrolysis has the advantage that the process time is reduced.
  • the result of the pyrolysis in both embodiments is a carbon body which is fiber reinforced by means of at least one UD fiber reinforcement ply and optionally fiber fabric plies / fiber fabric plies / nonwoven fabric plies.
  • the coating of the at least one unidirectional scrim 10 has been "eliminated” by decomposition or removal and / or the transverse threads 16 of the transverse thread system 14 have been decomposed. Channels have been formed which facilitate the liquid infiltration of the carbide former.
  • the carbon body is then infiltrated with carbide former.
  • carbide former for example, a silicon infiltration takes place according to the known LSI method. This creates a carbide ceramic matrix.
  • the manufactured component is a carbide ceramic component, which is fiber-reinforced via at least one UD fiber reinforcement layer.
  • UD-reinforced carbide can be any unidirectional scrim 10, which is provided with a pyrolysis volatile coating and / or with a volatile in pyrolysis transverse thread system 14.
  • the carbide-former infiltration leads to delaminations.
  • the solution according to the invention provides cavities and / or channels for the carbide-forming infiltration, by which these problems are prevented or at least greatly reduced.
  • the solution according to the invention makes it possible to produce UD-fiber-reinforced carbide-ceramic components. It is a manufacture for example about a
  • Filaments should not be provided with additional fiber protection (such as carbon or BN via CVD or wet chemical processes).
  • UD fiber-reinforced carbide ceramic components unless it comes to the above-described problems in the production, which are inventively avoided or greatly reduced, a high rigidity. They are thin and can be produced resist extension. They can be produced in particular for load-bearing structures with high strength. Furthermore, the process time can be kept short by the solution according to the invention.
  • a microstructure By means of an alternating layer construction with unidirectional layers 10 and "two-dimensional" fiber fabrics / fiber fabrics / fiber layers, a microstructure can be produced which leads to damage-tolerant material behavior.
  • FIG. 2 shows an SEM image of a first sample in which the fiber reinforcement takes place solely via unidirectional scrim 10.
  • the corresponding component was produced by prepreg pyrolysis (ie by direct pyrolysis of the starting body without prior preparation of a green body).
  • the carbon body produced by pyrolysis was ceramified by the LSI method.
  • the bright recognizable places are ceramic areas.
  • the fiber volume content in the first sample is 43.5%.
  • the short bending strength parallel to the fiber orientation of the first sample is 250.4 MPa.
  • the microstructure is inhomogeneous.
  • Figure 3 shows an SEM photograph of a second sample prepared by prepreg pyrolysis having alternating unidirectional gel layers and carbon fabric layers.
  • the carbon fabric layers are indicated in Figure 3 by the reference numeral 18.
  • the unidirectional gel layers are between the carbon fabric layers 18.
  • the bright areas are again ceramic areas.
  • the fiber volume content in the second sample is 44.8% and the short bending strength is 147.8 MPa.
  • microstructure in the second sample is more homogeneous than in the first sample (according to FIG. 2).
  • the insertion of the carbon fabric layers leads to a microcrack structure during pyrolysis.
  • This microcrack structure results in a more homogeneous microstructure of the composite, which also leads to a more damage tolerant material behavior.
  • the short-term strength is lower.
  • a third sample of which a SEM micrograph is shown in Figure 4, was fabricated over alternating layers of fabric layers (of carbon) and unidirectional layers 10. Initially, by curing the matrix material (phenolic resin), a CFRP green body in autoclave technology was produced starting from an initial body. This green body was then pyrolyzed and then infiltrated by molten silicon infiltration (by the LSI method) and ceramified.
  • the third sample has a homogeneous microstructure.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Composite Materials (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Products (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un composant en céramique carbonée renforcé avec des fibres, par lequel lors de l'utilisation d'au moins une structure unidirectionnelle, un élément carboné est fabriqué par pyrolyse et l'élément carboné est infiltré par des composés formant du carbone, la au moins une structure unidirectionnelle étant revêtue d'un matériau de revêtement, lequel est volatil lors de la pyrolyse, et/ou la au moins une structure unidirectionnelle présente un système de filaments en biais comportant des filaments en biais constitués du matériau volatil lors de la pyrolyse.
EP08708423A 2007-02-12 2008-01-30 Procédé de fabrication d'un composant en céramique carbonée renforcé avec des fibres et d'un composant en céramique carbonée Withdrawn EP2118039A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710007410 DE102007007410A1 (de) 2007-02-12 2007-02-12 Verfahren zur Herstellung eines faserverstärkten carbidkeramischen Bauteils und ein carbidkeramisches Bauteil
PCT/EP2008/051108 WO2008098838A1 (fr) 2007-02-12 2008-01-30 Procédé de fabrication d'un composant en céramique carbonée renforcé avec des fibres et d'un composant en céramique carbonée

Publications (1)

Publication Number Publication Date
EP2118039A1 true EP2118039A1 (fr) 2009-11-18

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EP08708423A Withdrawn EP2118039A1 (fr) 2007-02-12 2008-01-30 Procédé de fabrication d'un composant en céramique carbonée renforcé avec des fibres et d'un composant en céramique carbonée

Country Status (4)

Country Link
US (1) US20090239434A1 (fr)
EP (1) EP2118039A1 (fr)
DE (1) DE102007007410A1 (fr)
WO (1) WO2008098838A1 (fr)

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