Abstract:
The invention provides a coating formed by thermal spraying of a feed-composition, said feed-composition comprising: discreet micron-scale particles and discreet agglomerates of nano-scale particles.
Abstract:
A thermal spraying device with a first blowing mechanism for lengthening a droplet formed near the tips of thermal spraying materials by arc, and a second blowing mechanism for a blowing a tip portion of the lengthened droplet to atomize it into droplets and to scatter atomized droplets towards a face to be thermally sprayed. The first blowing mechanism lengthens the droplet so that the second blowing mechanism propels air to the tip portion of the lengthened droplet that is separated from a location where the tips of thermal spraying materials are adjacent and the arc is generated. Arcing between the tips of the thermal spraying materials continues stably, and satisfactory thermal spraying is possible.
Abstract:
A thermal spray coating process for depositing finely divided metallic or nonmetallic materials in a molten or semi-molten condition to form a coating on a substrate wherein the coating material may be powder, ceramic-rod, wire or molten materials. The process involves the use of a gas made from water in an electrolyzer, which includes two principal electrodes and a plurality of supplemental electrodes. The supplemental electrodes are not connected electrically to a power source. The electrolyzer is adapted to separate the water such that its constituents of H and O are not recombined and instead produced jointly to make the single combustible gas composed of combinations of clusters of hydrogen and oxygen atoms structured according to a general formula HmOn wherein m and n have null or positive integer values with the exception that m and n can not be 0 at the same time.
Abstract:
An article having a thermal-spray coating thereon is prepared by thermally spraying a coating material onto a surface of a substrate article. The coated article is nondestructively tested by directing a transmitted ultrasonic signal into the coated article, receiving a received ultrasonic signal from the coated article, and evaluating a near-bondline region of the coated article located adjacent to the surface of the article using the received ultrasonic signal.
Abstract:
A thermally sprayed coating is deposited onto a cylindrical internal surface of a base member after a rough surface has been formed on the cylindrical internal surface. The tapered surface is configured such that the internal diameter of the axial end portion is larger than the internal diameter of the remaining portions of the cylinder bore internal surface. After the tapered surface is formed, the thermally sprayed coating is honed. This method prevents exfoliation of a thermally sprayed coating at an end portion of a cylindrical internal surface in a situation where honing or another mechanical finishing process is applied to the thermally sprayed coating after the coating is formed on the cylindrical internal surface.
Abstract:
The cold spraying process according to the invention uses cold gas streams whose properties (temperature (T), particle density (p), pressure (p), particle velocity (v)) are variably changed such that they can be adapted to the desired properties of the coatings.
Abstract:
A thermal spray powder of the present invention includes particles composed of molybdenum disulfide, and a coating layer provided on the surface of each of the particles. The coating layer is composed of a metal that is softened or melted at a temperature lower than the heat decomposition temperature of the molybdenum disulfide. The coating layer is preferably composed of copper. The thermal spray powder suppresses heat decomposition of the molybdenum disulfide contained in the thermal spray powder during thermal spraying.
Abstract:
Yttria-coated ceramic components of semiconductor material processing apparatuses include a substrate and at least one yttria-containing coating on the substrate. The components are made by applying a first yttria-containing coating on a ceramic substrate, which can be a green body of the ceramic material. The coated green body is sintered. The first yttria-containing coating can be treated to remove attached yttria particles resulting from the sintering. In another embodiment, a second yttria-containing coating can be thermally sprayed on the first yttria-containing coating to cover the particles.
Abstract:
A process for protecting a thermal barrier coating. The process entails applying to a surface of the coating a liquid containing one or more of aluminum alkoxides, aluminum beta-diketonates, aluminum carboxylates, and aluminum alkyls. The liquid is applied so as to form a liquid film on the surface, and has viscosity and wetting properties that cause the liquid to infiltrate porosity within the coating beneath its surface. The coating is then heated to convert the alumina precursor to alumina. A first portion of the alumina forms a surface deposit on the coating surface, while a second portion of the alumina forms an internal deposit within the porosity of the coating. The surface deposit overlying the coating is available for sacrificial reaction with CMAS, and the internal deposit maintains a level of CMAS protection in the event the surface deposit is breached or lost through spallation, erosion, and/or consumption.
Abstract:
Disclosed herein are methods for coating metal substrates, systems therefore, and articles made therefrom. In one embodiment, the method of coating a metal substrate comprises: disposing a metallic bond coating on the metal substrate, creating ions with a reverse polarity high frequency apparatus at a frequency of greater than or equal to about 2.5 kHz, roughening the surface with the ions to a subsequent average surface roughness of greater than or equal to about 5 μm, and disposing a ceramic coating on the metallic bond coating surface. The metallic bond coating had a surface with an initial average surface roughness of less than or equal to about 1 μm.