53results about How to "Oxidation resistance can be improved" patented technology

An electro thermal fluidized bed furnace is adapted to be used in a process for continuously heat treating of fine particulate matter, such as carbon black material, by continuously introducing a non-reactive fluidizing gas through the nozzles of the furnace at a pre-determined rate, continuously introducing untreated carbon black material through the feed pipe of the furnace at a predetermined rate so that it forms a fluidized bed, energizing the electrode so as to heat the fluidized bed, and continuously collecting the treated carbon black from the discharge pipe. The carbon black collected from the discharge pipe exhibits properties of having the PAHs and sulfur removed, the carbon black has been graphitized, the moisture pick-up by the carbon black has been eliminated and the carbon black is more oxidation resistant, Furthermore, the resultant furnace carbon backs have a particle size of 7-100 nm and an oil absorption number of 50-300 ml/100 g., while the thermal blacks have a particle size of 200-500 nm and an oil absorption number of less than 50 ml/100 g. All of these properties result in thermally modified carbon blacks having such properties and of such purity so as to provide improved performance properties in food contact type applications, moisture cured polymer systems, zinc-carbon dry cell battery applications, and semi-conductive wire and cable applications.

A flexible microporous polymer sheet having first and second opposite major surfaces comprises a polymer matrix binding a filler component that exhibits high oil absorption capacity in its initial state before the start of material processing. The polymer matrix includes a polyolefin component and has three-dimensional interconnecting and interpenetrating pore and polymer networks through which the bound filler component is distributed from the first major surface to the second major surface. The polyolefin and filler components are included in amounts that result in a microporous polymer sheet having between about 75% and about 90% porosity and containing less than about 10 wt. % polyolefin component. Preferred polyolefin and filler components include ultrahigh molecular weight polyethylene and high oil absorption precipitated silica, respectively.

An intermetallic composition suitable for use as an environmentally-protective coating on surfaces of components used in hostile thermal environments, including the turbine, combustor and augmentor sections of a gas turbine engine. The coating contains the gamma-prime (Ni₃Al) nickel aluminide intermetallic phase and either the beta (NiAl) nickel aluminide intermetallic phase or the gamma solid solution phase. The coating has an average aluminum content of 14 to 30 atomic percent and an average platinum-group metal content of at least 1 to less than 10 atomic percent, the balance of the coating being nickel, incidental impurities, and optionally hafnium.

The present invention provides a blade tip for a rotary blade, the blade tip comprising a first portion and a radially-recessed second portion. A radially outermost surface of the first portion comprises a first abrasive coating e.g. a composite material comprising cubic boron nitride embedded in a matrix of nickel alloy. A radially outermost surface of the second portion comprises a second abrasive coating which has a greater resistance to oxidation than the first abrasive coating. The increased oxidation resistance of the second abrasive coating is achieved by providing a radially outer protective layer and/or using a material having a greater inherent oxidation resistance.

A composite oxide for a hydrocarbon reforming catalyst which maintains the catalytic activity at a high level over a long period of time, a process for producing the catalyst, and a process for producing syngas using the catalyst, are provided. The composite oxide for a hydrocarbon reforming catalyst is obtained by a process including preparing a mixed solution for impregnation which contains catalytic active components of Co, or Co and Ni, one or more oxidation resistance enhancing components selected from the elements of Group 3B and the elements of Group 6A of the Periodic Table, and one or more additive metal components selected from Ca and Mg; impregnating a carrier formed from a porous molded body selected from magnesia and a composite of magnesia and calcia, with the mixed solution for impregnation; drying the impregnated carrier; and calcining the dried carrier in an oxidizing atmosphere.

The improved electrolyte membrane which is produced by grafting a styrenic monomer and bis(vinylphenyl)ethane as monomers to a polymer substrate and then introducing sulfonic acid groups into the graft side chains formed has improved oxidation resistance and good adhesion to electrodes. The polymer substrate is preferably made of a fluorocarbon polymer or an olefinic polymer. The styrenic monomer is preferably one or more species selected from the group consisting of styrene, α-methylstyrene, vinyltoluene, and trifluorostyrene.

An improved lead-free solder of Sn-0.7 wt % Cu which contains 0.001-1.5 wt % Ti and an alkaline element of Li, Na, K, Rb, Cs, etc. The alkaline element accounts for 0.0001-0.8 wt %. Compared with the traditional lead-free solder of Sn-0.7 wt % Cu, the lead-free solder of the present invention is characterized by the resulting welding spots with glossier and smoother surface, alloy solder with improved diffusivity, and solder surface with enhanced oxidation resistance.

A method of providing an oxidation resistant coating is disclosed. The method includes providing a substrate having a first surface and cooling holes. A portable coating device includes electro-spark deposition (ESD) equipment and an ESD torch connected with the ESD equipment. The ESD torch has an inert gas source and a rotary electrode conductive material. The rotary electrode is positioned within the ESD torch, and is shielded by an inert gas. The rotary electrode applies a compositionally controlled protective coating to the first surface of the substrate. Then the rotary electrode is inserted into the cooling hole and generates an electrospark between rotary ESD electrode and the substrate to form a rounded edge and deposit a coating of electrode material alloy at a cooling hole edge.

A method of coating a metal substrate such as the components in second and third stages of gas turbine engines in order to increase the oxidation and corrosion resistance of the metal substrate under high temperature operating conditions, the method including the steps of forming a powdered mixture of a high-melt superalloy or MCrAlY component, where M comprises Fe, Ni and/or Co, and a low-melt component containing about 2-5 wt. % silicon, boron or hafnium, applying the powdered mixture to the surface of the metal substrate at room temperature using an atomized spray to form a uniform surface coating, and then heating the coated substrate surface under vacuum conditions to a temperature in the range of about 1900° F. to 2275° F. to obtain a uniform coating composition providing oxidation resistance to the underlying substrate.

To reduce a residual amount of chlorine atoms and oxygen atoms in a metal nitride film, and improve oxidation resistance of the metal nitride, film, in a temperature range of not deteriorating the characteristics of other film adjacent to the metal nitride film. A substrate processing apparatus is provided, comprising: a processing chamber into which a substrate is loaded, having thereon a substrate containing oxygen atoms, chlorine atoms, and metal atoms; a substrate support part for supporting and heating the substrate in the processing chamber; a gas supply part for supplying nitrogen atoms-containing gas and hydrogen atoms-containing gas into the processing chamber; a gas exhaust part for exhausting inside of the processing chamber; a plasma generation part for exciting the nitrogen atoms-containing gas and the hydrogen atoms-containing gas supplied into the processing chamber; and a control part for controlling the substrate support part, the gas supply part, and the plasma generation part.

Compounds having enhanced oxidation stability are disclosed. The compounds have an aryl boronic acid residue having one or more electron withdrawing groups on the aromatic moiety which contains the boronic acid residue, such that the molecule has enhanced oxidation resistance as compared to a corresponding molecule without the one or more electron withdrawing groups.

This invention is directed to a method of preventing oxidation of copper alloys at high temperatures by deposition of a nano-structured, low-chromium copper-chromium protective coating to copper-alloy components. The coatings of the present invention are applied by an ion beam assisted, electron beam physical vapor deposition and consist of copper and chromium particles having a diameter of about 10 nm. This invention also encompasses the coated copper-alloy components produced by the disclosed deposition methods.

The invention relates to a lamp (1) comprising a gastight vessel (2) embedding one or more feedthrough elements (7,8) electrically interconnecting an outer current conductor (9,10) and an inner current conductor (3,4) for operating said lamp. The feedthrough elements and/or the outer and inner current conductor are molybdenum alloy components containing at least one constituent from the group formed by rhenium and chromium in a quantity between 0.01 and 5% by weight; titanium in a quantity between 0.01 and 0.1% by weight; and aluminum, cobalt, gadolinium, hafnium, iridium, iron and zirconium in a quantity between 0.01 and 1% by weight of said alloy. The invention further relates to a method of manufacturing a lamp and a lamp component.

A coated article, a coating for protecting an article, and a method for protecting an article are provided. The article comprises a metallic substrate and a substantially single-phase coating disposed on the substrate, wherein the coating comprises nickel (Ni) and at least about 30 atomic percent aluminum (Al); the coating further comprises a gradient in Al composition, the gradient extending from a first Al concentration level at an outer surface of the coating to a second Al concentration level at an interface between the substantially single-phase coating and the substrate, wherein the first Al concentration level is greater than the second Al concentration level and the second concentration level is at least about 30 atomic percent Al.

A ceramic matrix composite includes a substrate which contains a fibrous body made of silicon carbide fiber, and a matrix which is formed in the substrate, and which contains silicon carbide and a silicon material made of silicon or a binary silicon alloy.

A configuration in which particles of pitch 2 having a softening point in the range of 70 to 200° C. and a diameter equal to or smaller than 30 μm are held on the surfaces of particles of a refractory raw material 3 having a diameter equal to or smaller than 50 μm is employed. This pitch-containing refractory raw material 1 can be used with the pitch being in a fine-particle form without any aggregation even after the long-term storage. Using it as a part of a raw material formulation allows the fine particles of pitch to be uniformly dispersed during the mixing or kneading process. The resulting carbon-containing refractory has an excellent corrosion resistance. It also provides suppressed increase in the Young's modulus while maintaining the level of strength, thereby being excellent in thermal spalling resistance even with the carbon content ratio being low.

A carbon material is formed by heat-treating a carbonaceous material in a reaction mix of oxides of boron and boron nitride in a nitrogen atmosphere to temperatures of 1600 to 2000° C. The surface of the carbonaceous material is transformed into a carbon material that is resistant to oxidation to temperatures of 900° C., enabling machined components to be utilized for weeks at that temperature. The carbon material is also stable in inert or vacuum environments to temperatures in the range of 1500 to 2000° C., enabling its use as aluminum evaporative boats and the like.

A porous material includes aggregate particles and a binding material. In the aggregate particles, oxide films containing cristobalite are provided on surfaces of particle bodies that are silicon carbide particles or silicon nitride particles. The binding material contains cordierite and binds the aggregate particles together in a state where pores are provided therein. The mass ratio of the cordierite to the whole of the porous material is in the range of 10 to 40 mass %. The oxide films that exist between the particle bodies and the binding material have a thickness less than or equal to 0.90 μm.

A multi-layered pipe of arbitrary length and cross-section is produced by co-extrusion of a lower polyolefin (C₂–C₄) outer body over the exterior surface of a tubular core of randomly, partially randomly, or blocky chlorinated lower polyolefin, the core having a wall thickness, measured in the radial direction, in the range from about 0.025 mm to 5 mm. The tubular core is coextensive with essentially the entire length of the pipe. The tubular core comprises a major proportion by weight of the randomly chlorinated polyolefin (r-CPO), or, partially randomly chlorinated polyolefin (pr-CPO), or, a blocky chlorinated polyolefin (b-CPO), any of which may be blended with a minor proportion by weight of a blending ingredient. The r-CPO, pr-CPO or b-CPO, or a blend thereof, each has an extrusion temperature in the same range as that for the corresponding non-halogenated polyolefin, namely in the range from about 150° C. to 250° C.