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23930 results about "Wear resistance" patented technology

Wear Resistance. the resistance of materials to wear. The wear resistance of parts is evaluated in bench tests or under operating conditions according to the duration of the operation of the tested materials or products to a preset level of or maximum wear.

Fluoropolymer binders for carbon nanotube-based transparent conductive coatings

This invention relates to flexible, transparent and conductive coatings and films formed using carbon nanotubes (CNT) and, in particular, single wall carbon nanotubes, with polymer binders. Preferably, coatings and films are formed from carbon nanotubes applied to transparent substrates forming one or multiple conductive layers at nanometer level of thickness. Polymer binders are applied to the CNT network coating having an open structure to provide protection through infiltration. This provides for enhancement of properties such as moisture resistance, thermal resistance, abrasion resistance and interfacial adhesion. Polymers may be thermoplastics or thermosets, or a combination thereof. Polymers may also be insulative or inherently electrical conductive, or any combination of both. Polymers may comprise single or multiple layers as a basecoat underneath a CNT coating, or a topcoat above a CNT coating, or combination of the basecoat and the topcoat forming a sandwich structure. A fluoropolymer containing binder, which is a solution of one fluoropolymer or a blend of fluoropolymers, which may be formulated with additives, is applied onto a carbon nanotube-based transparent conductive coating at nanometer level of thickness on a clear substrate such as PET and glass. The fluoropolymers or blend can be either semi-crystalline (with low level of crystallinity) or amorphous, preferably to be amorphous with low refraction index. Binder coating thickness can be adjusted by changing binder concentration, coating speed and/or other process conditions. This binder coating significantly improves optical transparency, and also maintain or increases conductivity of the CNT-based coating. With other benefits such as abrasion, thermal and moisture resistance, this binder coating and the resulting products is used for display and electronic applications.

Long-service-life split type valve seat

The invention discloses a long-service-life split type valve seat. The long-service-life split type valve seat comprises linings and bases. The linings are embedded into the outlet ends of the bases.The linings are matched with a valve body for use. Each lining is a tungsten carbide alloy. The long-service-life split type valve seat has the beneficial effects that the valve seat is composed of the linings and the bases, the linings are made of a hard alloy material, the hardness, the strength, the wear resistance and the corrosion resistance of the linings are improved, and the service life of the valve seat is greatly prolonged; the valve seat is of a split structure, once abrasion occurs, only the linings or the bases need to be replaced, integral replacement is not needed, maintenanceis convenient, the time and labor are saved, and meanwhile the production cost of an oil and gas field is reduced; the appropriate diameter sizes of the linings can be selected according to the working pressure, the conveying medium, the degree of abrasion of the valve body to the valve seat and the like in actual working conditions, and the application range is wide; the linings and the bases arein various shapes and can be combined according to actual working condition requirements, and the applicability is high.

Skeletal iron catalyst having improved attrition resistance and product selectivity in slurry-phase synthesis processes

Particulate skeletal iron catalyst is provided which contain at least about 50 wt. % iron with the remainder being a minor portion of a suitable non-ferrous metal and having characteristics of 0.062-1.0 mm particle size, 20-100 m2/g surface area, and 10-40 nm average pore diameter. Such skeletal iron catalysts are prepared and utilized for producing synthetic hydrocarbon products from CO and H2 feeds by Fischer-Tropsch synthesis process. Iron powder is mixed with non-ferrous powder selected from aluminum, antimony, silicon, tin or zinc powder to provide 20-80 wt. % iron content and melted together to form an iron alloy, then cooled to room temperature and pulverized to provide 0.1-10 mm iron alloy catalyst precursor particles. The iron alloy pulverized particles are treated with NaOH or KOH caustic solution at 30-95° C. temperature to extract and/or leach out most of the non-ferrous metal portion, and then screened and treated by drying and reducing with hydrogen and to provide the smaller size skeletal iron catalyst material. Such skeletal iron catalyst is utilized with CO+H2 feedstream for Fischer-Tropsch reactions in either a fixed bed or slurry bed type reactor at 180-350° C. temperature, 0.5-3.0 mPa pressure and gas hourly space velocity of 0.5-3.0 L/g Fe/hr to produce desired hydrocarbon products.

Chromium-free passivation liquid for galvanized sheet and manufacture method thereof

The invention in particular relates to passivation solution without chrome which is used for galvanized sheets and a method thereof. The technical scheme thereof comprises: firstly, dissolving inorganic salt corrosion inhibitor, then, adding the inorganic salt corrosion inhibitor into a stirred tank, adding dispersant, organic acid, sealant, silicone-acrylate emulsion and water while stirring, then, using inorganic acid or alkali to regulate the pH value to be 2.0-5.0, and then stirring for 1-2 hours under the condition that the temperature is 20-30 DEG C, the content of the components of each liter is: the inorganic salt corrosion inhibitor 10-55g, additive 4-10g, the organic acid 5-20g, the sealant 5-30g, the silicone-acrylate emulsion 150-300g, and the rest is the water. The method of the invention can additionally form a layer of organic resin separate layer on the basis of forming an inorganic metal compound precipitation film, additionally, since the silicon compound is added, not only the binding force between a passivation layer and zinc coating can be increased, but also the corrosion resistance, the scrubbing resistance and the wear resistance of the passivation layer can be increased, and the coating treatment after passivation can not be affected.

High temperature, oxidation-resistant abradable coatings containing microballoons and method for applying same

An abradable coating composition for use on shrouds in gas turbine engines or other hot gas path metal components exposed to high temperatures containing an initial porous coating phase created by adding an amount of inorganic microspheres, preferably alumina-ceramic microballoons, to a base metal alloy containing high Al, Cr or Ti such as β-NiAl or, alternatively, MCrAlY that serves to increase the brittle nature of the metal matrix, thereby increasing the abradability and oxidation resistance of the coating at elevated temperatures. Coatings having a total open and closed porosity of between 20% and 55% by volume due to the presence of ceramic microballoons ranging in size from about 10 microns to about 200 microns have been found to exhibit excellent abradability for applications involving turbine shroud coatings. An abradable coating thickness in the range of between 40 and 60 ml provides improved performance for turbine shrouds exposed to gas temperatures between 1380° F. and 1800° F. Abradable coatings in accordance with the invention can be used for new metal components or to repair existing equipment. The coatings can be applied to the metal shroud using thermal spray, processes that integrate sintering and brazing, or direct write techniques.

Wearable compound layer material for machine parts and manufacturing method and equipment thereof

The invention relates to a wearable compound layer material for machine parts and a manufacturing method and equipment thereof. The wearable compound layer material is a metal-based wearable compound layer material which is composed of a matrix metal and lots of particles or fibers dispersed and distributed in the matrix metal, thereby having a multi-phase structure. The wearable compound layer material is manufactured by a direct-current electroplating or pulse electroplating method. The direct-current electroplating or pulse electroplating equipment is composed of parts such as an electroplating power source, an electroplating tank, a metal anode or a metal alloy anode, a machine part substrate cathode, a stirring device, a solution circulating device, a heating and temperature control device, an additive supplementing device and the like. The wearable compound layer material for machine parts provided by the invention is obviously superior in performance to good-quality cast iron wearable parts, good-quality cast steel wearable parts and wearable parts for surface heat treatment of common steel and good-quality steel commonly employed in the present product. The wearable compound layer also has high-temperature abrasive resistance and excellent corrosion resistance while having excellent abrasive performance; and the internal stress of the coating is very low.
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