摘要:
A method for preparing ceramic powders in the presence of a carbon powder comprising a step of homogenizing a mixture of particles capable of resulting in a ceramic by heat treatment. Said method can be carried out in the presence of an accelerated solvent and provides, at reduced energy consumption, carbon-coated ceramic powders and then ceramics.
摘要:
A process for making a filter suitable for filtering molten metal comprising (i) forming a slurry comprising (a) particles of a refractory material, (b) a binder and (c) a liquid carrier, (ii) coating a disposable former with a slurry, (iii) drying the coated former, (iv) optionally applying one or more additional coats of a refractory material and/or a binder, optionally with liquid carrier, and drying the one or more additional coats, and (v) firing the coated former to produce the filter, wherein the binder is a carbon rich source selected from one or more of the following classes of materials: pitches, tars and organic polymers that degrade to form carbon on pyrolysis.
摘要:
A sliding material consisting of a carbon-fiber reinforced carbon composite material containing fine particles of a simple substance of any of Group IV to Group VI elements or a carbide, a nitride or an oxide thereof.
摘要:
A carbon-carbon composite plate (1) for stamping is provided, the carbon-carbon composite plate having a porosity P of 20% or greater, and the stamping being carried out in the absence of water, or the carbon-carbon composite plate having a porosity P of 10% or greater, and the stamping being carried out in the presence of water. This enables an intact plate-shaped member to be obtained by stamping.
摘要:
The invention concerns a method for preparing ceramic powders in the presence of a carbon powder comprising a step which consists in homogenizing a mixture of particles capable of resulting in a ceramic by heat treatment. Said method can be carried out in the presence of an accelerated solvent and provides, at reduced energy consumption, carbon-coated ceramic powders and then ceramics.
摘要:
A slurry for molding an article is provided wherein a source powder including at least one of a ceramic powder and a metal powder is dispersed, introduced into a forming mold, cured in the forming mold to form the molded article, and at least a part of the forming mold is degraded or dissolved in releasing the molded article from the forming mold. The major components of the slurry include the source powder, a dispersion medium and a gellifying agent, wherein the dispersion medium and the gellifying agent each contain an organic compound having a reactive functional group such that the slurry is cured by a reaction between the organic compound in the dispersion medium and the organic compound in the gellifying agent.
摘要:
Fiber-reinforced ceramic composites which comprise at least two layers of a multidirectional woven fiber fabric as reinforcement, with at least 5% of the area of each layer of woven fiber fabric being permeated by matrix material, friction disks comprising these composites as core zone or support zone, a process for producing them and their use as brake disks or clutch disks.
摘要:
A filter for molten metal is an open-pored porous material comprising particles of refractory material embedded in and bonded together by a carbon matrix bonding material. The filter can be made by forming a porous article from refractory particles, e.g. refractory oxide, carbide or graphite, and a carbon-rich binder, e.g. tar, pitch or an organic (preferably aromatic) polymer that degrades to form carbon on pyrolysis, and then firing the porous article to generate the carbon matrix in which the refractory particles are embedded. The porous article is preferably made by coating a reticulated polyurethane foam with binder and refractory particles, and firing at preferably no higher than 800null C.
摘要:
The inner shape of the body part in a hollow ceramic molded article constituting a precursor of a discharge vessel is precisely controlled so as to make a large improvement in the function of a discharge vessel formed by baking the hollow ceramic molded article. With the use of a core for molding having a wax molded article or molded article made of waxy substance, a slurry for molding is injected into a forming mold and cured, whereby a hollow ceramic molded article with a controlled inner shape of the body part is formed on the outer circumferential surface of the wax molded article or molded article made of waxy substance. The hollow ceramic molded article is baked to produce a discharge vessel.
摘要:
Fiber-reinforced ceramic composites comprising bundles, tows or hanks of long fibers, wherein the long fiber bundles, tows or hanks are completely surrounded by a short fiber-reinforced matrix, with the long and short fibers having, independently of one another, a mean diameter of from 4 to 12 nullm and the long fibers having a mean length of at least 50 mm and the short fibers having a mean length of not more than 40 mm, a process for producing them and their use for producing clutch disks or brake disks