摘要:
A material useful in a process for embossing a flexible graphite sheet is presented. The inventive material is a flexible graphite sheet which has a preselected void condition which provides the capability of controlling the morphology, and thus the functional characteristics, of the resulting embossed sheet (100).
摘要:
The present invention relates to a compressed mass of expanded graphite particles in the form of aflexible graphite sheet (10). The flexible graphite sheet is formed from particles of expanded natural graphite formed from graphite flake sized no more than about 30 % by weight + 80 mesh prior to expansion. The flexible graphite sheet (10) is provided with channels (20) which are perferably smooth-sided as indicated at (67) in Figure 5 and which pass between the opposite surfaces (30) and (40) of flexible graphite sheet (10) and are separated by walls (3) of compressed expandable graphite. The channels preferably have openings (50) on one of the opposed surfaces (30) which are larger than the openings (60) in the other opposed surface (40).
摘要:
Processes and systems are described herein for forming cooling channels (314) within a ceramic matrix composite component (300). The process introducing a ceramic material (18, 32) into a solid fiber material (14, 46) to produce a ceramic fiber composite (24, 48) and depositing the ceramic fiber composite (24, 48) in a predetermined pattern to form at least a portion of the ceramic matrix composite component (300) having a plurality of internal cooling channels (314) formed therein.
摘要:
Die Erfindung betrifft einen Schlicker, ein Prepreg, ein Laminat, einen Grünkörper sowie eine daraus hergestellte Ceramic Matrix Composite Turbinenkomponente. Durch die Erfindung wird erstmals ein Glycerin-haltiger Schlicker zur Herstellung einer CMC-Komponente zur Verfügung gestellt, dessen Gehalt an mineralischem und/oder keramischem Pulver 40 Vol% oder mehr, bezogen auf das gesamte Volumen des Schlickers, beträgt und/oder dessen Gehalt an Glycerin unter 10 Gew% - bezogen auf das Gesamtgewicht des keramischen Pulvers im Schlicker – liegt.
摘要:
L'invention concerne un procédé de fabrication de pièce en matériau composite, comprenant les étapes de : - réalisation d'une préforme fibreuse consolidée, les fibres de la préforme étant des fibres de carbone ou de céramique et étant revêtues d'une interphase, - obtention d'une préforme fibreuse consolidée et partiellement densifiée, la densification partielle comprenant la formation sur l'interphase d'une première phase de matrice obtenue par infiltration chimique en phase gazeuse, et - poursuite de la densification par infiltration de la préforme fibreuse avec une composition d'infiltration contenant au moins du silicium et au moins un autre élément apte à abaisser la température de fusion de la composition d'infiltration à une température inférieure ou égale à 1150°C.
摘要:
A composition having nanoparticles of a refractory-metal carbide or refractory-metal nitride and a carbonaceous matrix. The composition is not in the form of a powder. A composition comprising a metal component and an organic component. The metal component is nanoparticles or particles of a refractory metal or a refractory-metal compound capable of decomposing into refractory metal nanoparticles. The organic component is an organic compound having a char yield of at least 60% by weight or a thermoset made from the organic compound. A method of combining particles of a refractory metal or a refractory-metal compound capable of reacting or decomposing into refractory-metal nanoparticles with an organic compound having a char yield of at least 60% by weight to form a precursor mixture.
摘要:
一种高强度纤维增强陶瓷基复合材料的微区原位反应制备方法,包括以下步骤:(i)在复合材料纤维预制体表面沉积界面层以对纤维增强体进行保护,其中,所述界面层包括PyC界面、BN界面、SiC界面、以及它们的复合界面;所述界面层的厚度为10-2000nm;(ii)向所述复合材料纤维预制体的孔隙中引入Si 3 N 4 陶瓷相,以获得复合材料预成型体;(iii)将所述复合材料预成型体进行致密化处理,获得高强度纤维增强陶瓷基复合材料,其中,所述致密化处理包括高温处理,使得Si 3 N 4 与复合材料中的含碳相之间通过相互扩散而发生微区原位反应形成SiC相,其中,所述高温处理的温度为1200-2300°C。
摘要:
La présente invention concerne un matériau comprenant (i) des nanotubes ou des nanofils alignés les uns par rapport aux autres dans une matrice verticale et (ii) une matrice disposée entre les nanotubes ou les nanofils, au moins un polymère organique étant greffé, de façon covalente, à au moins deux desdits nanotubes ou à au moins deux desdits nanofils. La présente invention concerne également un procédé de préparation d'un tel matériau ou ses utilisations.
摘要:
In various embodiments, composite materials containing a ceramic matrix and a carbon nanotube-infused fiber material are described herein. Illustrative ceramic matrices include, for example, binary, ternary and quaternary metal or non-metal borides, oxides, nitrides and carbides. The ceramic matrix can also be a cement. The fiber materials can be continuous or chopped fibers and include, for example, glass fibers, carbon fibers, metal fibers, ceramic fibers, organic fibers, silicon carbide fibers, boron carbide fibers, silicon nitride fibers and aluminum oxide fibers. The composite materials can further include a passivation layer overcoating at least the carbon nanotube-infused fiber material and, optionally, the plurality of carbon nanotubes. The fiber material can be distributed uniformly, non-uniformly or in a gradient manner in the ceramic matrix. Non-uniform distributions may be used to form impart different mechanical, electrical or thermal properties to different regions of the ceramic matrix.