Abstract:
An article comprises a first member comprising a first carbon composite; and a second member disposed on the first member and comprising a second carbon composite and a reinforcing agent, wherein the second member has a gradient in the weight ratio of the second carbon composite to the reinforcing agent, and wherein the first member has one or more of the following properties different than those of the second member: elasticity; corrosion resistance; erosion resistance; or hardness.
Abstract:
A polycrystalline cubic boron nitride (PcBN) is fabricated using a process of overlaying layers of cubic boron nitride (cBN) powder, where the layers have cBN mixed with various concentrations of a ceramic. The process of fabricating the PcBN includes depositing, in a refractory capsule, a carbide, a cubic boron nitride (cBN), and a mixture of cBN and a ceramic, then applying a high pressure and high temperature (HPHT) to the content of the refractory capsule. During the depositing step of the process, the concentration of cBN in the mixture of the cBN and ceramic is lower than the concentration of cBN that is in the layer below it. Upon applying HPHT, the carbide first diffuses across the cBN layer, and then diffuses across the layer with the mixture of the cBN and ceramic. After HPHT ends and the content of the refractory capsule cools, the process yields a PcBN having layers with various concentrations of cBN, and at least one cBN layer with a ceramic material.
Abstract:
The present invention provides a ceramic to ceramic joint and methods for making such a joint. Generally, the joint includes a first (15) ceramic part and a second (20) ceramic part, wherein the first (15) and second (20) ceramic parts each include a ceramic-carbide or a ceramic-nitride material. In some cases, an aluminum-initiated joint region joins the first (15) and second (20) ceramic parts. This joint region typically includes chemical species from the first (15) and second (20) ceramic parts that have diffused into the joint region. Additionally, the first (15) and second (20) ceramic parts each typically include a joint diffusion zone that is disposed adjacent to the joint region and which includes aluminum species from the joint region that have diffused into the joint diffusion zone. Other implementations are also described.
Abstract:
The invention regards a neutron absorbing component (1) and a method for manufacturing a neutron absorbing component. The neutron absorbing component comprises a core (2) consisting of a first material, a layer (3) consisting of a second material. The layer encloses a least partly the core and is adapted to protect the core from an outer surrounding. The first material has a higher neutron absorption capability than the second material. The neutron absorbing component is manufactured by sintering in such a way that an intermediate layer (4) is formed between the core and the layer. The intermediate layer has a material gradient that comprises a decrease of the concentration of the first material from the core to the layer and an increase of the concentration of the second material from core to the layer.
Abstract:
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.
Abstract:
Produit fritte comportant un granulat réfractaire lié par une matrice, la matrice comportant, en pourcentages massiques sur la base de la matrice et pour un total de 100% : plus de 30% et moins de 80% d'alumine; plus de 10% et moins de 50% de silicium métallique; plus de 5% et moins de 60% d'une phase ou d'un ensemble de phases SiAION de formule SiχAlyOuNv, dans laquelle les indices stoechiométriques x, y, u et v sont tels que - x est supérieur ou égal à 0 et inférieur ou égal à 1; - y est supérieur ou égal à 0 et inférieur ou égal à 1; - u est supérieur ou égal à 0 et inférieur ou égal à 1; - v est supérieur à 0 et inférieur ou égal à 1; moins de 55% d'un ou plusieurs oxydes et/ou nitrures, et/ou carbures et/ou composés intermétalliques d'un ou plusieurs éléments choisis parmi Ti, Zr, Fe, Cr, W, Mo, Si et B; moins de 20% d'autres constituants. Application notamment à des revêtements de fours métallurgiques.
Abstract translation:本发明涉及一种玻璃料,其包含由基质连接的折射聚集体,所述基体以基于所述基质的重量%计含有100%:大于30%且小于80%的氧化铝; 超过10%且小于50%的硅金属; 超过5%且小于60%的具有式Si 3 Al y O n V n的SiAlON相或一组相,其中化学计量指数x,y,u和v使得:x大于或等于0,并且 小于或等于1; y大于或等于0且小于或等于1; u大于或等于0且小于或等于1; 且v大于0且小于或等于1; 小于55%的一种或多种选自Ti,Zr,Fe,Cr,W,Mo,Si和B中的一种或多种元素的氧化物和/或氮化物和/或碳化物和/或金属间化合物; 和少于20%的其他成分。 本发明特别可用于冶金炉涂层。