US20080176067A1 - Process for producing shaped bodies of carbon fiber reinforced carbon and shaped body produced by the process - Google Patents

Process for producing shaped bodies of carbon fiber reinforced carbon and shaped body produced by the process Download PDF

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US20080176067A1
US20080176067A1 US11/786,277 US78627707A US2008176067A1 US 20080176067 A1 US20080176067 A1 US 20080176067A1 US 78627707 A US78627707 A US 78627707A US 2008176067 A1 US2008176067 A1 US 2008176067A1
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fiber bundles
carbon
shaped body
bundles
process according
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Andreas Kienzle
Ingrid Kratschmer
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SGL Carbon SE
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SGL Carbon SE
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Assigned to SGL CARBON SE (FORMERLY SGL CARBON AG NAME CHANGE PREVIOUSLY RECORDED UNDER REEL/FRAME 024033/0962) reassignment SGL CARBON SE (FORMERLY SGL CARBON AG NAME CHANGE PREVIOUSLY RECORDED UNDER REEL/FRAME 024033/0962) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIENZLE, ANDREAS, KRAETSCHMER, INGRID
Priority to US15/278,056 priority Critical patent/US10336655B2/en
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/02—Composition of linings ; Methods of manufacturing
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/04—Coating on selected surface areas, e.g. using masks
    • C23C16/045—Coating cavities or hollow spaces, e.g. interior of tubes; Infiltration of porous substrates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/26—Deposition of carbon only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/02—Composition of linings ; Methods of manufacturing
    • F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
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    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/422—Carbon
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    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
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    • 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
    • C04B2235/5216—Inorganic
    • C04B2235/524—Non-oxidic, e.g. borides, carbides, silicides or nitrides
    • C04B2235/5248—Carbon, e.g. graphite
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    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5268—Orientation of the fibers
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/602—Making the green bodies or pre-forms by moulding
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • 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
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/268—Monolayer with structurally defined element

Definitions

  • the present invention relates to a process for producing shaped bodies, e.g. brakes disks, of carbon reinforced with short carbon fibers.
  • the invention also relates to a shaped body produced by the process.
  • CFRR materials carbon matrix reinforced with carbon fibers
  • C/C materials carbon/carbon materials
  • the reinforcing carbon fibers are often present in the form of flat or three-dimensional textiles, for example as woven fabrics or needled preforms.
  • both variants are relatively expensive to produce and can only be fitted to complex geometries to a limited extent.
  • An alternative is to make up the fiber reinforcement from loose short fibers or/and short fiber bundles.
  • U.S. Pat. No. 5,242,746 discloses a friction element which includes carbon fiber reinforced carbon and is composed of a plurality of different functional layers.
  • the friction element includes at least one structural layer which typically has a thickness of from 10 to 20 mm and has a high mechanical strength and at least one friction layer which typically has a thickness of from 3 to 7 mm and has advantageous tribological properties and a high abrasion resistance.
  • the fiber reinforcement of the structural layer has a relatively coarse texture and is formed by bundle-like segments of rovings.
  • the segments have a mean length of from 5 to 60 mm and include from 1,000 to 320,000 virtually parallel individual filaments.
  • the rovings, which are cut to form bundles, can be pre-impregnated to avoid disintegration of the bundles.
  • the fiber reinforcement of the friction layer has a fine texture and is formed by broken up individual filaments or bundles of less than 100 individual filaments having a mean length of from 0.05 to 60 mm, preferably from 0.2 to 2 mm.
  • the fiber bundles in the structural layer are randomly distributed, like the individual fibers in the friction layer. There is a continuous transition in the texture of the fiber reinforcement and of the carbon matrix between the two layers, so that the layers form a one-piece component.
  • the disintegration of the bundles can be reduced by pre-impregnation of the rovings, but the bundles obtained in that way are defined only by the mean length and the number of individual filaments, i.e. they do not have a defined width (dimension perpendicular to the longitudinal extension of the fibers, dependent on the number of fibers located side by side to one another) and thickness (dimension perpendicular to the length and width, dependent on the number of fibers located above one another) which can be set in a predetermined manner.
  • the individual filaments in the rovings can be both disposed side by side to one another and above one another and their configuration depends greatly on the external conditions (pressure, tension, shear force during mixing, etc.) to which the roving or the segments cut therefrom are subjected until the impregnation has cured sufficiently for it to fix the filaments in their configuration present at that point in time.
  • the defined configuration of the fibers in the bundles allows a targeted configuration of the reinforcing fibers in the carbon matrix and thus a structure of the reinforcement which matches the stress.
  • a process for producing shaped bodies, especially brake disks, including a carbon matrix reinforced with short carbon fiber bundles comprises the following steps:
  • the second process comprises the following steps:
  • the fiber bundles are densified by impregnation in a fluidized bed.
  • the green body including the molding composition having impregnated fiber bundles and the carbonized shaped body obtained therefrom are therefore more highly densified than in the first process variant.
  • the time required for densification of the carbonized shaped body through the use of CVI is therefore lower in the second process variant.
  • a shaped body comprising carbon reinforced with carbon fiber bundles and a carbon matrix including a pyrolysis residue of a carbonizable matrix former and carbon deposited by chemical vapor infiltration (CVI).
  • the carbon fiber bundles have specifically set, defined dimensions, with a thickness of the bundles being set to a value in a range of from 0.15 to 0.4 mm, a length of the bundles being set to a value in a range of from 6 to 15 mm, and a width of the bundles being set to a value in a range of from 0.5 to 3.5 mm, and the carbon fiber bundles having carbon fibers aligned parallel to one another.
  • FIG. 1 is a diagrammatic, perspective view illustrating charging of a tool for producing a brake disk having tangential alignment of fiber bundles
  • FIG. 2 is a top-plan view of the tool with a charging grate
  • FIG. 3 is an enlarged, fragmentary, top-plan view showing a tangential configuration of the fibers in the tool brought about by the charging grate.
  • carbon fibers are all types of carbon fibers regardless of the starting material, but with polyacrylonitrile, pitch and cellulose fibers being the most widely used starting materials.
  • a process for producing fiber bundles which have a defined length, width and thickness and include parallel carbon fibers and a dimensionally stable cured polymeric binder is disclosed in European Patent Application EP 1 645 671, corresponding to U.S. Patent Application Publication No. US 2006/0076699.
  • that process includes the following steps:
  • the rovings are preferably fanned out before impregnation in order to aid in the parallel configuration of the fibers next to one another in the plane.
  • the binder content of the prepreg is from 25 to 48% by mass and depends on the impregnation conditions selected.
  • the prepreg has a mass per unit area of from 200 to 500 g/m 2 .
  • the prepreg in the form of one or more impregnated rovings disposed side by side is passed through rollers, a calender, a belt press or another suitable continuous pressing apparatus.
  • the excess binder is preferably squeezed out of the rovings through the use of a plurality of gaps between rollers which are disposed in series with decreasing gap width and the rovings are pressed flat to such an extent that each roving includes no more than three superposed layers of fibers, preferably only one single layer of fibers, having substantially parallel filaments.
  • the pressing of the prepreg is carried out in the hot state (a temperature up to 200° C.), so that the carbonizable binder either cures fully or cures to at least such an extent that dimensionally stable rovings in which the individual filaments are fixed in their parallel configuration next to and above one another, are obtained.
  • Cooling of the now flat rovings bonded by the cured binder is also preferably carried out in the pressing apparatus.
  • a flat laminate sheet including parallel filaments (unidirectional laminate, hereinafter referred to as “UD laminate”) and having a thickness of from 0.15 to 0.4 mm is obtained.
  • the laminate sheet can, if necessary to assist handling, be divided up into bands having a width of from 20 to 60 mm.
  • the UD laminate sheets or bands are then cut longitudinally into strips having a width which corresponds to the desired width of the fiber bundles. This is preferably effected through the use of a cutting roller or a plurality of cutting rollers disposed side by side. It is also possible to cut the laminate sheet or the bands in the not yet fully cured state into strips through the use of wires stretched across the path of the band.
  • the strips are fed directly to a preferably continuously operated apparatus for cutting to length and cut into segments (fiber bundles) of the desired length.
  • a preferably continuously operated apparatus for cutting to length and cut into segments (fiber bundles) of the desired length.
  • the strips which have been cut to the chosen width are wound up onto spools and transported to the apparatus for cutting to length.
  • the continuous cutting of the strips to the desired length is preferably carried out through the use of a blade roller.
  • the fiber bundles obtained in this way have a defined, uniform length, width and thickness.
  • the bundle thickness i.e. the number of superposed layers of fibers, was set during pressing of the roving to form the laminate sheet.
  • the bundle width i.e. the dimension which is perpendicular to the fiber direction and is determined by the number of parallel fibers disposed side by side to one another in a layer of fibers, is set in the longitudinal cutting of the laminate sheet or the bands to yield strips.
  • the bundle length i.e. the dimension in the fiber direction, is set by the cutting to length of the strips to yield segments (fiber bundles).
  • At least 90% of the fiber bundles produced in this way have a length which is in the range of from 90 to 110% of the mean length and a width which is in the range of from 90 to 110% of the mean width.
  • the fiber bundles obtained in this way are very easy to handle, they are free-flowing and can be poured and can easily be mixed with other components to yield relatively homogeneous molding compositions.
  • the fibers are held together by the dimensionally stable cured binder, so that the bundles cannot disintegrate during further processing and the fibers are fixed in their parallel spatial configuration within the bundles.
  • Fiber bundles having a thickness of from 0.15 to 0.4 mm, a length of from 6 to 15 mm and a width of from 0.5 to 3.5 mm are particularly suitable for the process of the present invention.
  • Fine fiber bundles, i.e. fiber bundles having a low thickness (preferably only one layer of fibers) and a low width (not more than 1 mm) are preferred since a particularly homogeneous distribution of the fibers in the molding composition and thus a fairly uniform density of the molding composition and a particularly homogeneous microstructure of the shaped body can be achieved therewith. The more homogeneous the microstructure of the shaped body, the fewer the opportunities for failure under load.
  • the fiber bundles are mixed with a carbonizable matrix former and, if appropriate, auxiliaries, to yield a molding composition.
  • a carbonizable matrix former is a carbon-containing polymeric material, for example a resin, which upon heating in a nonoxidizing atmosphere forms a pyrolysis residue consisting essentially of carbon.
  • the carbonizable matrix former can be present as a pulverulent dry resin or as a wet resin. Phenolic resins are particularly suitable as matrix formers.
  • the proportion by mass of the fiber bundles in the molding composition is from 70 to 80%. If a dry resin is used as a matrix former, mixing can be carried out in a tumble mixer. When a wet resin is used, more intensive mixing is necessary, which can be achieved, for example, through the use of an Eirich mixer.
  • auxiliaries such as silicon carbide for improving the tribological properties and oxidation inhibitors such as zirconium carbide, tantalum carbide or tantalum boride which inhibit oxidative attack upon exposure to oxygen by glass formation, can be mixed into the molding composition.
  • the total proportion by mass of auxiliaries in the molding composition is not more than 10%.
  • the carbonizable binder present in the fiber bundles is firstly carbonized before production of the molding composition or, as an alternative, the binder in the UD laminate is carbonized before cutting of the bundles.
  • the bundles obtained in this way include parallel carbon fibers held together with a carbonized binder. Due to the volume shrinkage of the binder occurring upon carbonization, these bundles are relatively open-pored and can therefore directly take up further carbonizable matrix former.
  • a carbonizable matrix former is a carbon-containing polymeric material, for example a phenolic resin, which upon heating in a nonoxidizing atmosphere forms a pyrolysis residue consisting essentially of carbon.
  • impregnation is advantageously carried out in a mechanically generated fluidized bed.
  • This can be generated through the use of a blade mixer.
  • the carbon fiber bundles are firstly preheated to a temperature sufficient for curing or drying of the resin while mixing at a Froude number of less than 1.
  • the resin is subsequently introduced while briefly increasing the Froude number to values in the range of from 1.5 to 4, preferably not more than 2.5, and after the resin has been mixed into the fluidized bed is maintained at a Froude number of less than 1 until the resin has cured or dried completely so that the bundles can no longer stick together.
  • the bundles including parallel carbon fibers held together by a carbonized binder can take up to 35% of their own mass of carbonizable matrix former.
  • a molding composition is produced in the above-described way from the impregnated fiber bundles, a carbonizable matrix former and, if appropriate, auxiliaries.
  • a green body having the desired shape for example in the form of a brake disk, is produced from the molding composition through the use of a mold which is close to the final shape. Pressing is typically carried out at a pressure in the range of from 1.5 to 5 N/mm 2 and a temperature in the range of from 120 to 200° C. Preference is given to using a hot molding press. After curing, the tool is opened and the green body which is close to the final shape is taken out.
  • the carbonizable matrix former in the green body is converted into a carbon matrix so as to yield a carbonized shaped body.
  • the green body is heated slowly in a protective gas atmosphere, i.e. under nonoxidizing conditions, to a temperature at which pyrolysis of the matrix former to yield a residue consisting essentially of carbon occurs and is maintained at this temperature for a particular time. Heating has to be carried out sufficiently slowly to avoid formation of cracks in the shaped body due to sudden release of gaseous pyrolysis products. Heating is typically carried out at a rate of 1 K/min to a temperature of 900° C., which is then maintained for about one hour. The body is subsequently slowly cooled down to room temperature again.
  • the shaped body experiences a decrease in mass and correspondingly an increase in porosity as a result of the elimination of gaseous pyrolysis products from the matrix former.
  • the density of the carbonized shaped body is typically from about 1.3 to 1.45 g/cm 3 .
  • the carbonized shaped body can be re-impregnated with a carbonizable matrix former (resin or pitch) and then carbonized again.
  • a carbonizable matrix former resin or pitch
  • the carbonized shaped body can be subjected to further mechanical working if necessary.
  • cooling channels can be cut out or holes can be introduced.
  • the porous carbonized shaped body is re-densified by deposition of a carbon matrix through the use of chemical vapor infiltration (CVI), so that its density increases to values in the ranges from 1.6 to 1.8 g/cm 3 .
  • CVI chemical vapor infiltration
  • a suitable carbon-donating gas is methane.
  • the time required for the re-densification through the use of CVI can be reduced by about 10-30% if the fiber bundles are impregnated with a carbonizable matrix former before being mixed into the molding composition, so as to yield a denser green body.
  • Re-impregnation of the carbonized shaped body with a carbonizable matrix former which is subsequently carbonized also effects a comparable shortening of the time required for CVI.
  • the orientation of the fiber bundles in the shaped bodies produced according to the invention can be random, i.e. statistically distributed. This is preferred when the body is subjected to an approximately uniform load in all spatial directions.
  • orientation of the fiber bundles according to stress is desirable. This can be achieved by simple measures during introduction of the molding composition containing the fiber bundles into the mold, for example by use of a charging grate.
  • Carbon fiber rovings each including 50,000 virtually parallel individual filaments are impregnated with a phenolic resin (Norsophen 1203 from the firm Hexion) so as to form a prepreg having a resin content of 35% by mass and a weight per unit area of 320 g/m 2 .
  • This prepreg is continuously compacted at a speed of 1 m/min and a pressure of 1 MPa (10 bar) on a belt press at a temperature of 180° C. to form a laminate sheet having a thickness of 200 ⁇ m and is at the same time cured so as to yield a dimensionally stable laminate sheet.
  • the UD laminate sheet is subsequently divided into individual bands having a width of 50 mm each. These are cut as described above to yield segments (fiber bundles) having a length of 9.4 mm and a width of 1 mm.
  • FIG. 1 a diagrammatic illustration of the charging of the mold.
  • a mold 1 having a cavity which corresponds to the geometry of the brake disk to be produced, is charged with the molding composition containing the fiber bundles 3 .
  • a charging grate 2 which has a plurality of concentric rings having a spacing of less than or equal to the length of the fiber bundles 3 , is used.
  • FIG. 2 diagrammatically shows how the charging grate 2 is disposed on the mold 1 .
  • the molding composition containing the fiber bundles 3 falls through the intermediate spaces between the concentric rings of the charging grate 2 and the fiber bundles 3 take on the substantially tangential configuration shown diagrammatically in FIG. 3 .
  • the charged mold is subjected to a pressure of 4.0 N/mm 2 and a temperature of 160° C. on a hot molding press for 30 minutes and subsequently opened.
  • the phenolic resin cures.
  • a green body which is close to the final shape in the form of a brake disk is obtained.
  • the green body is heated at a heating rate of 1 K/min to a temperature of 900° C. under a nitrogen atmosphere in a protective gas furnace.
  • the phenolic resins are decomposed to leave a residue consisting essentially of carbon. This temperature is maintained for one hour.
  • the carbonized shaped body is then cooled to room temperature.
  • a carbon matrix is deposited in the porous carbonized shaped body through the use of chemical vapor infiltration (CVI).
  • CVI chemical vapor infiltration
  • the CVI is carried out at 1100° C. using methane as a carbon donor.
  • methane as a carbon donor.
  • the density of the carbonized shaped body increases from 1.3 to 1.8 g/cm 3 .
  • the strength of the brake disks determined in a bending test increased by 12-20% as compared to brake disks having a random configuration of the fiber bundles.

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  • Composite Materials (AREA)
  • Structural Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Inorganic Chemistry (AREA)
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  • Braking Arrangements (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
US11/786,277 2006-04-11 2007-04-11 Process for producing shaped bodies of carbon fiber reinforced carbon and shaped body produced by the process Abandoned US20080176067A1 (en)

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Cited By (2)

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EP2727896A1 (en) 2012-11-02 2014-05-07 Brembo SGL Carbon Ceramic Brakes GmbH Carbon fibre-reinforced brake disc
US20210285511A1 (en) * 2020-03-13 2021-09-16 Goodrich Corporation Composites and methods of forming composites via pitch infiltration

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KR101336101B1 (ko) * 2010-11-29 2013-12-03 주식회사 데크 탄소-세라믹 브레이크 디스크 및 이를 만드는 방법
US8597772B2 (en) * 2011-09-20 2013-12-03 Honeywell International Inc. Corrugated carbon fiber preform
CN102492289B (zh) * 2011-11-14 2013-08-28 丹阳丹金航空材料科技有限公司 一种碳纤维增强复合材料及其制备工艺
CN105715719B (zh) * 2016-03-21 2018-02-02 北京科技大学 一种高导热半金属刹车片
US20250075759A1 (en) * 2023-09-05 2025-03-06 Goodrich Corporation Ceramic particualte coating for wear improvement
CN118479885A (zh) * 2024-03-29 2024-08-13 深圳市佰斯倍新材料科技有限公司 一种基体中含短切碳纤维的碳陶刹车盘及其制备方法

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JP5096031B2 (ja) 2012-12-12
EP1845075A1 (de) 2007-10-17
CN101055008A (zh) 2007-10-17
CN101055008B (zh) 2011-06-01
EP1845075B1 (de) 2016-04-06
US20170015594A1 (en) 2017-01-19
US10336655B2 (en) 2019-07-02
KR20070101177A (ko) 2007-10-16

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