摘要:
L'invention concerne un procédé de dépôt d'un revêtement d'un premier alliage métallique sur une fibre (10) s'étendant selon une direction principale D, comprenant les étapes suivantes : (a) On fournit une première masse (20) d'un premier alliage métallique et on chauffe la première masse (20) au-dessus de sa température de fusion de telle sorte que cet alliage est liquide et occupe un espace El, (b) On translate cette fibre (10) de l'amont vers l'aval au travers de la première masse (20) liquide selon la direction dans laquelle la fibre (10) s'étend à une première vitesse VI de telle sorte que la fibre (10) se recouvre, sur au moins une portion de sa longueur, d'un revêtement (25) du premier alliage d'épaisseur non nulle sur toute sa périphérie dans un plan perpendiculaire à la direction principale D. Avant l'étape (a), on effectue les étapes suivantes : (i) On fournit une seconde masse (220) d'un second alliage métallique dont la température de fusion TF2 est strictement supérieure à la température de fusion TF1 du premier alliage, (j) On chauffe la seconde masse (220) au-dessus de sa température de fusion de telle sorte que ce second alliage est à l'état liquide et occupe un espace E2, puis on translate la fibre (10) de l'amont vers l'aval au travers du second alliage, cette translation s'effectuant à une seconde vitesse V2 qui est telle que le régime d'emport du second alliage lors de cette translation se situe dans le domaine visco-capillaire, de telle sorte que la fibre (10) se recouvre sur cette portion de sa longueur d'un revêtement (225) du second alliage d'épaisseur non nulle sur toute sa périphérie, (k) On refroidit ce revêtement (225) jusqu'à ce qu'il devienne solide.
摘要:
Disclosed is a composition, in particular a dispersion, which contains nanofiber material in at least one organic matrix component, said nanofiber material being pre-treated in at least one method step for adjusting the physical properties of the composition.
摘要:
A method includes a providing a molten glass fiber core and disposing a plurality of nanoparticles that include a transition metal oxide on the molten glass fiber core at or above the softening temperature of the glass fiber core, thereby forming a nanoparticle-laden glass fiber. The plurality of nanoparticles are embedded at the surface of said glass fiber core. A method includes providing a mixture of molten glass and a plurality of nanoparticles. The plurality of nanoparticles include a transition metal. The method further includes forming nanoparticle-laden glass fibers, in which the plurality of nanoparticles are embedded throughout the glass fibers.
摘要:
Direct-write techniques are provided for the high speed (up to millimeter per second) and continuous fabrication of elongated nanostructures such as nanofibers. The nanofibers may be of an ionic solid, a hydrated salt, a molecular solid, or aggregated colloidal particles such as semiconductor particles. The nanofibers may also be converted to other forms.
摘要:
Direct-write techniques are provided for the high speed (up to millimeter per second) and continuous fabrication of elongated nanostructures such as nanofibers. The nanofibers may be of an ionic solid, a hydrated salt, a molecular solid, or aggregated colloidal particles such as semiconductor particles. The nanofibers may also be converted to other forms.
摘要:
A method of sensing strain in a structural component, the method comprising the steps of providing, embedded within said structural component, at least one carbon fibre element (10) coated with an electrically conductive material (12), measuring the electrical resistance of said coated carbon fibre element and determining strain in respect of said carbon fibre element based on changes in said electrical resistance thereof. A method of manufacturing a carbon fibre element, a carbon fibre element so manufactured, and a carbon fibre reinforced structural component including such a carbon fibre element are also disclosed.
摘要:
Methods for enhancing the strength and stiffness of fibers, including nanoreinforced fibers and fiber tows, composite materials including the nanoreinforced fibers and tows, and articles of manufacture including the composite materials, are disclosed. The methods involve adhering random or aligned nanoreinforcement materials, such as carbon nanotubes, nanofibers, graphene plates, nanowires, nanoparticles, into or onto a spread carbon tow or yarn to form modified fibers wherein nanoreinforcement is adhered or trapped within the carbon tow. The carbon nanotubes or nanofibers can be aligned. Carbon fiber tows including the modified carbon fibers can be processed or woven for impregnation with a thermoset resin or thermoplastic to form a composite structure. The performance increase of the modified fibers relative to the unmodified fibers can be greater than the weight increase caused by the modification. Increased fiber stiffness and strength can result in a significant weight saving.
摘要:
Graphitic structures have been prepared by exposing templates (metal, metal-coated ceramic, graphite, for example) to a gaseous mixture that includes hydrocarbons and oxygen. When the template is metal, subsequent acid treatment removes the metal to yield monoliths, hollow graphitic structures, and other products. The shapes of the coated and hollow graphitic structures mimic the shapes of the templates.
摘要:
Es werden ein Verfahren zur Herstellung eines Filterelements und ein Filterelement für eine Abgasnachbehandlungseinrichtung einer Brennkraftmaschine vorgeschlagen, deren Temperaturbeständigkeit und mechanische Belastbarkeit infolge von Wärme Spannungen gegenüber herkömmlichen keramischen Körpern erhöht ist. Das Filterelement besteht aus Magnesium-Aluminium-Silikat und enthält Fasern (42) , bevorzugt beschichtete Fasern.