摘要:
Carbon-ceramic brake discs, the remaining porosity in which, after infiltration with a carbide-forming element and reaction of this element with at least part of the carbon in the preliminary body of the carbon-ceramic brake disc to form carbides, is at least partly filled with particles whose average diameter is in the range from 0.5 nm to 20 nm, and a process for producing carbon-ceramic brake discs with reduced porosity, wherein carbon-ceramic brake discs are treated with a solution of organic compounds of boron, zirconium, titanium, silicon or aluminum or mixtures of such compounds, the cited organic compounds being present as sols in an organic solvent, after removal from the sol bath the brake discs treated in this way are dried in an oven at a heating rate of between 30 K/h and 300 K/h under air or protective gas and are then tempered at a final temperature of between 350° C. and 800° C. for between 20 minutes and 120 minutes
摘要翻译:碳陶瓷制动盘,剩余的孔隙率,其中,在碳化物形成元件渗入之后,该元件与碳陶瓷制动盘的预备体中的至少一部分碳的反应形成碳化物,至少是 部分填充有平均直径在0.5nm至20nm范围内的颗粒,以及用于生产孔隙率降低的碳陶瓷制动盘的方法,其中碳陶瓷制动盘用硼,锆的有机化合物 ,钛,硅或铝或这些化合物的混合物,所引用的有机化合物作为溶胶存在于有机溶剂中,在从溶胶浴中除去后,以这种方式处理的制动盘在烘箱中以30的加热速率干燥 K / h和300K / h,然后在350℃和800℃之间的最终温度下回火20分钟至120分钟
摘要:
A friction disc, in particular a brake or clutch disc, includes carbon fiber-reinforced ceramic composite material with at least one top surface formed as a friction surface. At least part of the friction surface is formed of a different material, in particular of a carbon-containing material. The different material exhibits lower wear and oxidation resistance than that of the rest of the friction surface and a supporting zone of the friction disc. A visual, audible or mechanical signal is produced under operating conditions due to comparatively greater wear. The signal provides a warning that the service life of the friction disc is being exceeded. A process for producing the friction disc is also provided.
摘要:
Process for protecting fiber-reinforced, carbon-containing composites whose matrix comprises, at least in the outer layer, silicon carbide (SiC) and also silicon (Si) and/or silicon alloys against oxidation, which comprises the steps a) impregnation of the composite with an aqueous, phosphate-containing solution, b) drying, c) heat treatment at a temperature which is at least sufficient to convert the dried solution into insoluble compounds which are suitable for forming a self-healing glass, wherein the composite is treated oxidatively to form silicon oxide (SiO2) either prior to step a), between steps a) and b) or during or after step b) and/or c).
摘要:
A multilayer ceramic composite is described which contains at least one supporting zone having oxidation-sensitive reinforcing fibers as well as a matrix. The matrix optionally contains oxidation-sensitive components. The composite further contains at least one surface layer, as well as at least one additional protective layer disposed between the supporting zone and surface layer, and whose matrix is composed substantially of at least one component of the matrix of the supporting zone or cover layer. The protective layer further contains additives that form self-healing layers.
摘要:
Ceramic friction linings comprising a material consisting essentially of metal oxides which are present in the form of a sintered ceramic or in the form of ceramic particles bound by carbon and/or carbides, processes for producing them and their use in combination with ceramic friction bodies, in particular for high-performance brakes.
摘要:
Carbon-ceramic brake discs, the remaining porosity in which, after infiltration with a carbide-forming element and reaction of this element with at least part of the carbon in the preliminary body of the carbon-ceramic brake disc to form carbides, is at least partly filled with particles whose average diameter is in the range from 0.5 nm to 20 nm, and a process for producing carbon- ceramic brake discs with reduced porosity, wherein carbon-ceramic brake discs are treated with a solution of organic compounds of boron, zirconium, titanium, silicon or aluminum or mixtures of such compounds, the cited organic compounds being present as sols in an organic solvent, after removal from the sol bath the brake discs treated in this way are dried in an oven at a heating rate of between 30 K/h and 300 K/h under air or protective gas and are then tempered at a final temperature of between 350° C. and 800° C. for between 20 minutes and 120 minutes
摘要翻译:碳陶瓷制动盘,剩余的孔隙率,其中,在碳化物形成元件渗入之后,该元件与碳陶瓷制动盘的预备体中的至少一部分碳的反应形成碳化物,至少是 部分填充有平均直径在0.5nm至20nm范围内的颗粒,以及用于生产孔隙率降低的碳陶瓷制动盘的方法,其中碳陶瓷制动盘用硼,锆的有机化合物 ,钛,硅或铝或这些化合物的混合物,所引用的有机化合物作为溶胶存在于有机溶剂中,在从溶胶浴中除去后,以这种方式处理的制动盘在烘箱中以30的加热速率干燥 K / h和300K / h,然后在350℃和800℃之间的最终温度下回火20分钟至120分钟
摘要:
Process for producing hollow bodies comprising fiber-reinforced ceramic materials, where mold cores whose shape corresponds to that of the hollow spaces are produced in a first step, at least one mold core together with a press moulding composition or formable fiber composition are introduced into a mold, where the press moulding composition comprises carbon fibers and/or carbon filaments and thermally curable carbonizable binders, in such a way that the position of the cores corresponds to the desired position of the hollow spaces to be formed in a second step, the composition is cured in a third step by heating to a temperature of from 120° C. to 280° C., to give a green body, the strengthened green body is carbonized and or graphitized in a fourth step by heating in a nonoxidizing atmosphere to a temperature of from about 750° C. to about 2400° C. to form a C/C body, wherein heating in the third and/or fourth step is at least partly effected by an electric current being passed through the pressable composition or the green body and through at least one mold core, hollow bodies produced in this way and their use for producing clutch disks or brake disks, in particular for automobiles
摘要:
Process for a fiber-reinforced ceramic material whose reinforcing fibers are present in the form of at least one of woven fabrics, short fibers and long fibers, wherein the mass ratio of the fibers in the form of woven fabrics, short fibers and long fibers is 0-35:25-80:0-45 and at least a part of the reinforcing fibers has at least one protective layer of carbon produced by pyrolysis of resins or pitches, boron compounds or phosphorus compounds or combinations thereof which have been deposited thereon, a process for producing it and its use as material for brake linings
摘要:
Brake disk rings which have perforation holes perpendicular to the plane of the friction surfaces, characterized in that the perforation holes each have a distance from their nearest neighbors which is always at most 30 mm and on average is at least twice the average hole diameter.
摘要:
Clutch lings comprising fiber-reinforced ceramic materials which comprise carbon fibers and whose matrix material is selected from among inorganic polymers, oxidic ceramics, set cements, organoelement polymers and finely divided inorganic solids which are held together by an inorganic or organic binders.