EP3198069B1 - Utilisation d'un non-tissé de fibres de carbone comme matériau isolant thermique - Google Patents

Utilisation d'un non-tissé de fibres de carbone comme matériau isolant thermique Download PDF

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Publication number
EP3198069B1
EP3198069B1 EP15781031.8A EP15781031A EP3198069B1 EP 3198069 B1 EP3198069 B1 EP 3198069B1 EP 15781031 A EP15781031 A EP 15781031A EP 3198069 B1 EP3198069 B1 EP 3198069B1
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Prior art keywords
carbon fiber
nonwoven fabric
fibers
carbon
weight
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German (de)
English (en)
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EP3198069A1 (fr
Inventor
Valentina Mass
Birger Lange
Ulrich Schneider
Marcel Hofmann
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Carl Freudenberg KG
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Carl Freudenberg KG
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D04H1/4242—Carbon fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4274—Rags; Fabric scraps
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres

Definitions

  • the invention relates to the use of a carbon fiber nonwoven fabric having a high purity as a thermal insulating material, for example for the insulation of a high-temperature furnace and / or vacuum furnace.
  • Carbon fiber nonwovens are known in principle and are used for various purposes, for example in the field of fiber-reinforced plastics for the production of components, for the dissipation of static charges and the production of electrical conductivity, as components in energy storage. Also known are carbon fiber felts, ie needled nonwovens with a needle density of well over 100 stitches / cm 2 . Carbon fiber felts are usually formed by the needling of precursor fibers into a sheet, which is then carbonized and optionally modified with other additives. An important application for carbon fiber felts is thermal insulation.
  • carbon fiber felts are often not sufficiently carbonized, which leads to the fact that the application in the heat exhaust gases and deposits form when the felts are used without pretreatment.
  • carbon fiber felts although already solidified by needling, typically contain binders, resins and / or adhesives, particles or auxiliary fibers. The addition of these aggregates is made necessary by the special manufacturing process for carbon fiber felts in which the needlepunched Precursorvlies, ie precursor felt is carbonized. In the conversion of precursor to carbon fibers, the fibers shrink, creating cavities that must be compacted by additional treatment with various additives. The use of such additives has the disadvantage that they can decompose on heating.
  • a lack of purity of the carbon fiber felts is also disadvantageous because it is accompanied by increased dust release during use. Further, upon heating, thermal degradation products can form that are undesirably deposited or released as exhaust gases.
  • the DE102009048422A1 describes a composite comprising at least one layer of soft felt and at least one layer of carbon fiber hard felt, wherein the at least one layer of soft felt is bonded to the at least one layer of carbon fiber hard felt via a binder.
  • the use of the binder is disadvantageous because it can decompose on heating.
  • the DE102010020193A1 describes a cured thermal insulation material with carbon fibers for a high temperature furnace.
  • a manufacturing method comprising the steps of: (a) selecting short carbon fibers, opening the short carbon fibers and needling the carbon fibers to form a web; (b) forming the web by needle punching into a prefabricated body, (c) densifying the prefabricated body obtained in step (b) by chemical vapor deposition and graphitizing to produce a blank of thermal insulating material; (d) placing the blank of thermal insulating material obtained in step (c).
  • the vapor deposition in step (c) consumes foreign particles. This is disadvantageous since, as discussed above, these particles can be emitted, for example, when used in a high-temperature vacuum.
  • US2013192434 (A1 ) describes a process for producing a carbon fiber aggregate and a process for producing carbon fiber reinforced plastic. Also described is a carbon fiber nonwoven fabric with a proportion of carbon fibers of at least 98 wt.%, which can be produced by needling carbonized PAN precursor fibers.
  • DE102009023529 (A1 ) describes a process for the recycling of fiber composite waste from unimpregnated carbon fibers, in which the fiber composite waste with a predetermined fiber length distribution are recycled so that the waste cut into separate, equal sections of defined fiber length and this then while maintaining the fiber length by an energetic breaking strength of the carbon fibers correspondingly set low impact impactor action to a fiber separation and then the carbon fiber entanglement thus obtained is restructured to a nonwoven fabric or to a fiber web spun into an endless filament.
  • the invention was based on the object of providing a thermal insulation material which is characterized by simple handling and good mechanical and chemical resistance and which can furthermore be produced by a simple process and which is characterized by a low particle release in use, for example in a high-temperature vacuum. and / or protective gas furnace, distinguished.
  • This object is achieved by the use of a carbon fiber nonwoven fabric, which has a proportion of carbon fibers of at least 98 wt.% And can be prepared by needling carbonized precursor in the stretched state, as a thermal insulating material.
  • the carbon fiber nonwoven fabric is characterized by high purity and advantageously has a proportion of foreign materials of less than 2 wt.% On.
  • foreign materials are materials which are not carbon fibers, for example materials which are usually added to nonwovens, such as additives, binders, auxiliary fibers, polymers, fillers.
  • a carbon fiber is understood as meaning a fiber which consists of at least 92% carbon.
  • Carbon fibers can be obtained by charring fibers from synthetic and natural sources. Preference is given to fibers which have been stretched and carbonized under tension in a single-stage or multi-stage process at temperatures of from 1000 to 2500.degree. As a result, fibers with particularly good strength properties can be obtained.
  • a carbon fiber nonwoven fabric which was produced from carbonized precursor fibers in the stretched state and has a low proportion of foreign materials, can be used excellently as an insulating material. This distinguishes the carbon fiber nonwoven from the previously used felts made by carbonizing precursor fiber felts become.
  • a disadvantage of this production method is that the fibers are not stretched in the carbonization process, which leads to a lower strength of the individual fibers and, consequently, to an increased brittleness of the fibers and an increased release of dust.
  • the carbon fiber nonwoven described here is characterized by high stability and integrity. Due to this, the use of a filler or binder can be dispensed with and the nonwoven fabric can be produced with a very high purity.
  • the high purity of the nonwoven in conjunction with its integrity means that it is particularly low in dust. This is particularly advantageous, for example, when used as a thermal insulating material in a high-temperature vacuum and / or inert gas furnace, since only a few particles are emitted, and therefore can be dispensed with time-consuming and costly thermal pretreatment and the contamination of the treated workpieces can be reduced.
  • the carbon fiber nonwoven fabric is characterized in that a specimen of the carbon fiber nonwoven fabric submitted at atmospheric pressure, at a temperature of 23 ° C, humidity of 50% with the dimensions of (B * L * H) 100 * 100 * 7 mm when passing through an air stream at a suction pressure of 0.88 bar, measured on the surface of the test specimen, for a period of 30 seconds, a mass loss of less than 1.5% by weight, preferably from 0.01% by weight to 1, 3% by weight, more preferably 0.03% by weight to 0.7% by weight, even more preferably 0.05% by weight to 0.5% by weight, more preferably from 0.08% by weight to 0.3 Weight% shows.
  • the carbon fiber nonwoven fabric is characterized by a very low dust release during use.
  • the invention thus also encompasses the use of the carbon fiber nonwoven fabric described here as a thermal insulating material, in particular for the insulation of a high-temperature furnace and / or a vacuum furnace.
  • a carbon fiber nonwoven fabric with the high purity according to the invention can be produced in a simple process, and that such a nonwoven fabric also has surprisingly good mechanical properties, such as high fiber integrity Low release of dust, exhaust gases and deposits in use, as well as good drapability is characterized.
  • the carbon fiber nonwoven fabric has very good thermal properties, such as excellent thermal insulation capability.
  • the carbon fiber nonwoven fabric is excellent as a thermal insulating material, especially for a high-temperature furnace, such as a Hochtemperaturinertgasofen and / or vacuum furnace.
  • the carbon fiber nonwoven fabric has proven to be a thermal insulating material in ovens for growing crystals, since in this area special purity is required. Due to the high purity and thermal stability of the carbon fiber nonwoven undesirable flaws in the crystals can be avoided.
  • the carbon fiber nonwoven fabric is further distinguished by a particularly homogeneous pore size distribution over the surface.
  • the carbon fiber nonwoven fabric has such a homogeneous pore size distribution over the surface that the deviation of the mean pore diameters of three arbitrarily taken circular samples having a test specimen diameter of 18.5 mm from the average of the mean pore diameters of the three specimens is 0%. to 15%, more preferably 0% to 10%, even more preferably from 0% to 8%.
  • the average pore diameter is determined by the method Porolux 1000 from IB-FT in accordance with ASTM E 1294-89, with pore filing being used as the wetting liquid.
  • Another advantage of using the carbon fiber nonwoven fabric described above is that due to the use of already carbonized fibers in its manufacture, the shrinking problem discussed above does not occur. This makes it possible to dispense with the use of aggregates for further densification and / or solidification.
  • the carbon fiber nonwoven fabric described here because of its high purity, allows it to be used directly without thermal pretreatment.
  • the nonwoven fabric is also characterized by its easy handling, chemical resistance and a very good high-temperature resistance of up to 600 ° C in the air.
  • the carbon fiber nonwoven fabric shows in particular better product properties than known carbon fiber felts containing foreign substances, such as impurities, additives or binders. Due to its good mechanical stability, the carbon fiber nonwoven fabric can be designed both rollable and free-standing.
  • the high-purity carbon fiber nonwoven fabric shows excellent flame resistance.
  • the carbon fiber nonwoven fabric according to a preferred embodiment of the invention is used as a thermal insulating material against the propagation of flames.
  • the carbon fiber nonwoven is also characterized by excellent acoustic insulation properties. Particularly good acoustic properties can be obtained if the carbon fiber nonwoven fabric has an average surface weight of 200 g / m 2 to 1000 g / m 2 , measured according to DIN EN 29073-1, preferably from 400 g / m 2 to 800 g / m 2 , still more preferably 600 g / m 2 to 800 g / m 2 .
  • the acoustic properties can be further improved.
  • fibers having a mean fiber diameter of 2 .mu.m to 15 .mu.m, preferably from 2 .mu.m to 12 .mu.m, in particular from 2 .mu.m to 9 .mu.m has proven to be suitable. Also suitable is the setting of a flow resistance to values of 500 to 1500 Pa * s / m, measured according to DIN EN 29053-A, preferably from 600 to 1200 Pa * s / m, more preferably 700-1100 Pa * s / m proved.
  • the carbon fiber nonwoven fabric Due to its high carbon content, the carbon fiber nonwoven fabric has a high chemical resistance. In combination with the nonwovens inherent very good compressibility and drapability, the carbon fiber nonwoven fabric is thus very well suited as a fluid-tight insulating material, which can be used for example for corrosive media.
  • Another preferred application of the carbon fiber nonwoven fabric is as a thermal insulating material against electromagnetic radiation.
  • the carbon fiber nonwoven fabric Due to its good thermal and acoustic properties and high stability, the carbon fiber nonwoven fabric is also suitable for applications where high demands are placed on the materials, such as aerospace and / or rail transport.
  • the carbon fiber nonwoven fabric has a low content of foreign matters preferably less than 1.8% by weight, more preferably from 0% by weight to 1.5% by weight, even more preferably from 0% by weight to 1% by weight %, more preferably from 0% to 0.5% by weight, more preferably from 0% to 0.3% by weight, and most preferably from about 0% by weight.
  • a high purity of the carbon fiber nonwoven fabric may be effected, for example, by the carbon fiber nonwoven fabric containing the carbon fibers in a proportion of at least 98% by weight, preferably 98.2% by weight to 100% by weight, more preferably 99% by weight to 100% by weight .% And in particular of about 100 wt.% Contains.
  • the carbon fiber nonwoven fabric has a carbon content of 92% by weight to 100% by weight, more preferably from 95% by weight to 100% by weight, even more preferably from 98% by weight to 100% by weight, and especially from 99% by weight to 100% by weight. According to the invention, therefore, very pure, stretched carbon fibers are used. This is advantageous in that they show a high stability, which has a favorable effect on the integrity of the nonwoven fabric.
  • the average thickness of the carbon fiber nonwoven fabric is adjusted depending on the intended use and is usually in the range from 1 mm to 10 mm, more preferably from 4 mm to 10 mm. The average thickness is tested according to DIN EN ISO 9073-2.
  • the carbon fibers contained in the carbon fiber nonwoven fabric can basically be produced by high-temperature treatment of a wide variety of precursor fibers, for example polyacrylonitrile fibers, cellulose fibers, lignin fibers, pitch-based and / or phenolic resin-based fibers.
  • Suitable fiber raw materials are thus, for example, natural fiber raw materials such as cellulose and / or lignin, pitch-based and / or phenolic resin-based fiber raw materials, provided that they can be used to produce a carbon fiber nonwoven having the high purity according to the invention.
  • the carbon fiber nonwoven fabric is characterized by a sulfur content of at most 0.5% by weight, more preferably from 0% by weight to 0.1% by weight, even more preferably from 0% by weight to 0.05% by weight .%, More preferably from 0 wt.% To 0.01 wt.%, Each based on the total weight of the carbon fiber nonwoven fabric.
  • sulfur deposits can be avoided when using the carbon fiber nonwoven fabric as a thermal insulating material, for example in high-temperature furnaces, without a previous heating of the insulating material to remove the sulfur content is necessary.
  • carbon fibers As carbon fibers, a variety of fibers can be used, provided they have the required purity. According to the invention, preference is given to carbon fibers which originate from a recycling process, since this reduces the production costs and allows an environmentally friendly product to be obtained.
  • recycled fibers are understood to be finite fibers which are obtained as products in a textile and / or chemical process for processing used carbon fiber-containing materials.
  • the used fibers may be derived from any used carbon fiber-containing material, such as fabrics, knits, knits or knits, mats, filaments, filaments, non-wovens or carbon fiber composites.
  • Recycled fibers which have been obtained from reinforcing fibers are particularly preferred since these fibers are usually distinguished by a high degree of purity and strength.
  • the carbon fibers have a length between 20 mm and 200 mm, more preferably a length between 30 mm and 150 mm, most preferably a length between 50 mm and 100 mm.
  • the carbon fibers may also be present as mixtures of carbon fibers of different lengths.
  • carbon fibers are used which have a specific heat capacity below 0.8 J / gK. As a result, an undesirably high absorption of heat when used in high-temperature furnace can be prevented.
  • carbon fibers are used which have a thermal conductivity of less than 20 W / mK, preferably in the range of 8 W / mK to 20 W / mK. As a result, an undesirably high dissipation of heat when used in high-temperature furnace can be prevented.
  • the density of the carbon fibers is usually in the range of 1.76 g / cm 3 to 2.00 g / cm 3 , more preferably 1.76 g / cm 3 to 1.81 g / cm 3 . It has been found that these fibers can be used to produce nonwovens having particularly good integrity.
  • the carbon fiber nonwoven fabric contains carbon fibers which have been produced by high-temperature treatment of stretched polyacrylonitrile (PAN) fibers as precursor fibers.
  • PAN stretched polyacrylonitrile
  • the composition and properties of the PAN based carbon fiber depends essentially on the maximum temperature with which the fiber was treated.
  • the PAN fibers are usually subjected to a preoxidation step in a first step.
  • the preoxidized PAN fibers are carbonized at the particular desired temperature under train.
  • the carbonization temperatures are usually in the range from 1000 ° C to 2500 ° C. It has been found that at temperatures above 1000 ° C, sufficient carbonation of the preoxidized PAN fiber can already be achieved.
  • An advantage of the use of PAN fibers as starting material for the production of carbon fibers is that the fibers obtained thereby are substantially free of sulfur, and show excellent strength values.
  • the carbon fiber nonwoven fabric preferably contains more than 50% by weight, more preferably from 60% by weight to 100% by weight, even more preferably from 70% by weight to 100% by weight, more preferably from 80% by weight to 100% by weight. , and in particular from 90% to 100% by weight of carbon fibers produced by high temperature treatment of PAN fibers.
  • the insulating material consists essentially entirely of carbon fibers made by high temperature treatment of PAN fibers.
  • the carbon fiber nonwoven fabric is further characterized by a low thermal conductivity of at most 0.1 W / mK, for example, from 0.01 W / mK to 0.1 W / mK, or from 0.02 W / mK to 0.09 W / mK , or from 0.03 W / mK to 0.08 W / mK at room temperature of 23 ° C and air measured in accordance with DIN standard 52 612, with the following differences: The investigation was carried out in an air-conditioned room at 23 ° C and 50% humidity, the sample was previously stored for 24 hours in this room, the heating plates have a dimension of 80 * 80 mm, the investigation was carried out in a two-plate process.
  • a low thermal conductivity is advantageous for the use according to the invention in the high-temperature furnace, since unwanted heat losses can be avoided.
  • the carbon fiber nonwoven fabric can be brought into the desired shape depending on the desired field of use.
  • the carbon fiber nonwoven fabric may be formed as a plate or cladding such as a hollow cladding.
  • the carbon fiber nonwoven fabric can be used as a single layer, as a multilayer and / or in combination with other layers.
  • the carbon fiber nonwoven fabric is used as a composite of a plurality of carbon fiber nonwoven fabric layers.
  • the number of layers can be selected according to the desired insulating properties.
  • the individual layers can also be arranged loosely on each other or joined together, for example by sewing.
  • the use of the carbon fiber nonwoven fabric in combination with other layers for example as a laminate with heat-reflecting metal foils. It is also conceivable that the metallic layers are applied by vapor deposition.
  • the carbon fiber nonwoven fabric can also be equipped with adhesive compositions and / or with pressure-sensitive adhesives, so-called Pressure Sensitive Adhesives or PSA, to simplify the processing.
  • the solidification steps of the nonwoven fabric to nonwoven fabric without Exposure of foreign substances, for example, without binders and binder fibers, are performed.
  • the needling has proven to be advantageous in practical experiments, as this nonwoven fabrics can be obtained with a relatively large pore volume.
  • a large pore volume is particularly advantageous with regard to the use of the nonwoven fabric as a thermal insulating material.
  • the total pore volume is calculated using the thickness measured according to DIN EN ISO 9073-2.
  • the nonwoven fabric for example its porosity, stiffness, thickness and / or basis weight. Furthermore, a very uniform product can be obtained.
  • the carbon fibers are carded before being deposited into a nonwoven web.
  • the carbon fiber nonwoven fabric can be produced by the aerodynamic nonwoven formation, which can be processed into carbon fiber nonwoven fabric.
  • Example 1 Preparation of a carbon fiber nonwoven fabric
  • the starting material used in the carbon clay production sucked edge sections (so-called hoover waste) are used.
  • the fibers used were carbonized in the stretched state and have a length distribution of 50 mm to 100 mm.
  • the fibers are formed into a web formation process to the web and then needled.
  • the needled product has an average basis weight of 400 g / m 2 and an average thickness of about 4 mm.
  • Example 2 Preparation of a carbon fiber nonwoven fabric
  • the starting material described in Example 1 is formed by a web-forming process and subsequent needling to a slightly needled semi-finished product.
  • the second step a doubling of the semi-finished products and another needling takes place.
  • the product obtained in this case has an average basis weight of 800 g / m 2 and an average thickness of about 7 mm.
  • Example 3 Determining Relevant Properties of the Carbon Fiber Nonwoven Fabric for Use as a Thermal Insulation Material
  • the carbon fiber nonwoven fabric produced in Example 2 was subjected to the following tests, which confirm its suitability as an insulating material, in particular as a thermal insulation material:
  • the determination of the thermal conductivity was carried out under air in an air-conditioned room with 50% humidity and room temperature of 23 ° C.
  • the specific thermal conductivity is 0.06 W / mK. Materials with such low thermal conductivity are suitable as insulation materials.
  • the carbon fiber nonwoven fabric is very easy to cut or stamp, with little dust development can be observed. Therefore, the carbon fiber nonwoven meets the handling requirements set in the field of thermal insulation.
  • the carbon fiber nonwoven fabric was evaluated for its area shrinkage. For this purpose, 100 * 100 mm pieces were punched out and measured with a ruler (accuracy ⁇ 1 mm). The height and width of the pieces were each 100 mm. These pieces of carbon fiber nonwoven fabric were stored at 1950 ° C for one hour under argon. After the cooling process, the samples were removed from the oven and repeatedly measured with the ruler. The height and width of the pieces were each 100 mm. No shrinkage could be detected.
  • An advantage of non-shrinking materials is that when used as insulation material in the oven, the formation of non-isolated areas can be avoided. This is advantageous because non-isolated areas not only reduce the insulating effect of the material, but can also lead to malfunction of the furnace.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonwoven Fabrics (AREA)

Claims (7)

  1. Utilisation d'un non-tissé de fibres de carbone ayant une proportion de fibres de carbone d'au moins 98 % en poids en tant que matériau isolant thermique, caractérisée en ce que le non-tissé de fibres de carbone peut être fabriqué par aiguilletage de fibres précurseurs carbonisées à l'état étiré.
  2. Utilisation selon la revendication 1, caractérisée en ce que le non-tissé de fibres de carbone présente une teneur en carbone supérieure à 92 % en poids, par rapport au poids total du non-tissé de fibres de carbone.
  3. Utilisation selon une ou plusieurs des revendications précédentes, caractérisée en ce que les fibres de carbone proviennent d'un procédé de recyclage.
  4. Utilisation selon une ou plusieurs des revendications précédentes, caractérisée en ce que le non-tissé de fibres de carbone contient des fibres de carbone qui ont été fabriquées par un traitement à température élevée de fibres de PAN en tant que fibres précurseurs.
  5. Utilisation selon une ou plusieurs des revendications précédentes, caractérisée en ce que les fibres contenues dans le non-tissé de fibres de carbone présentent une teneur en soufre d'au plus 0,5 % en poids.
  6. Utilisation selon une ou plusieurs des revendications précédentes, caractérisée en ce que le non-tissé de fibres de carbone est utilisé en tant que matériau isolant thermique pour un four à température élevée et/ou un four sous vide.
  7. Utilisation selon une ou plusieurs des revendications 1 à 5, caractérisée en ce que le non-tissé de fibres de carbone est utilisé en tant que matériau isolant contre le rayonnement électromagnétique, en tant que matériau isolant contre la propagation de flammes.
EP15781031.8A 2014-09-24 2015-09-21 Utilisation d'un non-tissé de fibres de carbone comme matériau isolant thermique Active EP3198069B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014013867.4A DE102014013867A1 (de) 2014-09-24 2014-09-24 Verwendung eines Carbonfaservliesstoffs als Isoliermaterial
PCT/EP2015/071540 WO2016046103A1 (fr) 2014-09-24 2015-09-21 Utilisation d'un non-tissé de fibres de carbone comme matériau isolant

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EP3198069A1 EP3198069A1 (fr) 2017-08-02
EP3198069B1 true EP3198069B1 (fr) 2019-03-06

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DE (1) DE102014013867A1 (fr)
WO (1) WO2016046103A1 (fr)

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WO2022150727A1 (fr) * 2021-01-08 2022-07-14 Miller Scientific Inc. Isolation souple à haute température pour environnements extrêmes

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DE102014013867A1 (de) 2016-03-24
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