Abstract:
A two stage kinetic energy spray device has a first stage first nozzle having a receiving end that receives a particulate stream, an injection end located axially to the first nozzle receiving end, the injection end receiving the particulate stream from the receiving end. A second stage has a second nozzle, the second nozzle having a gas receiving portion that receives an effluent gas, a convergent portion that is downstream from the gas receiving portion and a divergent portion that is downstream from the convergent portion, the convergent portion and the divergent portion meeting at a throat. The particle stream is accelerated to a first velocity in the first nozzle located within the second nozzle divergent portion The effluent gas is accelerated to a second velocity in the second nozzle. First nozzle injection end chevrons allow mixing of particulate and supersonic effluent streams prior to exiting the spray device.
Abstract:
A process for applying erosion resistant coatings includes the steps of applying (36) a fluoroelastomer based solution to at least a portion of at least one perforated surface (12) of an article (10), at least one perforated surface includes a plurality of perforations, and each of the perforations (14) has a pre-coating diameter of no less than about 0.025 inches (0.635 mm) and no greater than about 0.075 inches (1.905 mm); drying (38) at least one perforated surface (12) coated with the fluoroelastomer based solution; and curing (42) at least one perforated surface (12) coated with the fluoroelastomer based solution to form an erosion resistant coating.
Abstract:
Method of inhibiting the deposition, on a metallic surface, of products resulting from the thermal degradation of hydrocarbons, wherein a polymeric coating based on polyvinylidene fluoride is deposited on the said surface, characterized in that: the said coating is composed of a mixture of a polyvinylidene fluoride homopolymer or of a polyvinylidene fluoride copolymer, the other components being present in a proportion of 1% to 20% by weight of the polymer, and a glass; the said coating is obtained from a mixture of polymer particles having a flow index of 10 to 300 grams per 10 minutes, as determined in accordance with the standard ASTM D1238, condition J, and spherical or ovoid glass particles with a size of between 1 and 300 µm; the ratio between the percentages by mass of the glass and of the polymer is between 0.05 and 0.50; and the coating is obtained by a fluidized bed process, or by an electrostatic process, or by compressed air, or by flame vaporization, or by electrostatic fluid bed. Metallic component thus coated, such as an engine injector.
Abstract:
A method for chemical vapor deposition using a very fine atomization or vaporization of a reagent containing liquid (T) or liquid-like fluid (T) near its supercritical temperature, where the resulting atomized or vaporized solution (N) is entered into a flame or a plasma torch (170), and a powder is formed or a coating is deposited onto a substrate (190). The combustion flame (170) can be stable from 10 torr to multiple atmospheres, and provides the energetic environment in which the reagent contained within the fluid (T) can be reacted to form the desired powder or coating material on a substrate (190). The plasma torch likewise produces the required energy environment, but, unlike the flame, no oxidizer is needed so materials stable in only very low oxygen partial pressures can be formed. Using either the plasma torch or the combustion flame (170), coatings can be deposited and powders formed in the open atmosphere without the necessity of a reaction chamber, but a chamber may be used for various reasons including process separation from the environment and pressure regulation.
Abstract:
A method for modifying the surface of a solid material and a surface-modified solid material are provided, where an excellent adhesion strength between the surface of the solid material and any of coating films made of various UV-curing resins or the like can be obtained. In other words, it is attained by carrying out a silicatizing flame treatment on the surface of the solid material by wholly or partially blowing a flame of a fuel gas containing a specific silicon-containing compound having a flash point of 0 to 100°C and a boiling point of 105 to 250°C, such as hexamethyldisilazane, vinyltrimethoxysilane, trifuloropropyl trimethoxysilane, 3-chloropropyl trimethoxysilane.
Abstract:
A coherent material is formed on a substrate ( 10 ) by providing a precursor suspension ( 14 ) in which particulates are suspended in a carrier fluid, and directing the precursor suspension ( 14 ) at the substrate ( 10 ) from a first source ( 12 ). Generally contemporaneously with application of the deposited precursor suspension ( 14 ) to the surface, hot gases, e.g. hot gases produced by a flame ( 16 ), are directed at the substrate ( 10 ) from a remote second source ( 18 ) to fuse the particulates into the coherent material.
Abstract:
A coherent material is formed on a substrate ( 10 ) by providing a precursor suspension ( 14 ) in which particulates are suspended in a carrier fluid, and directing the precursor suspension ( 14 ) at the substrate ( 10 ) from a first source ( 12 ). Generally contemporaneously with application of the deposited precursor suspension ( 14 ) to the surface, hot gases, e.g. hot gases produced by a flame ( 16 ), are directed at the substrate ( 10 ) from a remote second source ( 18 ) to fuse the particulates into the coherent material.
Abstract:
A coherent material is formed on a substrate ( 10 ) by providing a precursor suspension ( 14 ) in which particulates are suspended in a carrier fluid, and directing the precursor suspension ( 14 ) at the substrate ( 10 ) from a first source ( 12 ). Generally contemporaneously with application of the deposited precursor suspension ( 14 ) to the surface, hot gases, e.g. hot gases produced by a flame ( 16 ), are directed at the substrate ( 10 ) from a remote second source ( 18 ) to fuse the particulates into the coherent material.
Abstract:
An improved chemical vapor deposition apparatus and procedure is disclosed. The technique provides improved shielding of the reaction and deposition zones (26, 28) involved in providing CVD coatings by establishing a barrier zone (30) wherein gases flowing from a reaction zone (26) and deposition zone (28) to the ambient atmosphere are made to flow at a velocity of at least 15.24 m/min. Coatings can thus be produced, at atmospheric pressure, of materials which are sensitive to components in the atmosphere on substrates which are sensitive to high temperatures and which are too large, or inconvenient, to process in vacuum or similar chambers. The improved technique can be used with various energy sources and is particularly compatible with Combustion Chemical Vapor Deposition (CCVD) techniques.