摘要:
A thermal spray process comprises injecting precursor solution droplets into the hot zone of the thermal spray flame. Also described are materials resulting from the process.
摘要:
An RF power (Bottom RF) from a radio-frequency power source 12 is turned off (t5) and the supply of a He gas 14 to a back face of a wafer W is stopped (t5) when an end point detector 17 (EPD) detects an end point (t5), and a high-voltage DC power source 13 (HV) is turned off (t6) under the condition in which an RF power (Top RF) from a radio-frequency power source 11 is controlled to fall within a range in which etching does not progress and plasma discharge can be maintained (t5). This process enables the inhibition of the adhesion of particles while an etching amount is accurately controlled.
摘要:
The present invention relates to a method including thermal spraying a chromium nitride coating material on to an article. The chromium nitride may be in a powder form before thermal spraying. In one aspect, the thermal spraying includes melting the coating material, propelling the molten coating material toward the article to be coated, and coating the article with the molten coating material. In another aspect, the coated article is one or more piston rings.
摘要:
The invention relates to a process and a device for high-velocity flame spraying, the spray particles being accelerated in a flame jet of combustion gases. The injection of spray particles according to the invention takes place axially and centrally in the divergent section of the Laval nozzle, the powder tube (2) and the outer nozzle body (1) together forming a Laval nozzle for acceleration of the flame jet.
摘要:
An improved method of forming an abradable thermal barrier coating comprises providing a spray-dried powder of M-CrAlY and a solid lubricant, such as CoNiCrAlYnullBN. Unlike powders provided for use with plasma spray guns, the powder is essentially free of polyester or other organic fugitive additives provided to increase porosity. The powder is applied using a combustion spray process and results in a M-CrAlY abradable coating that has an average porosity comparable to that of a plasma-applied coating but with smaller and more uniform pore distribution, and without requiring post-application heat treatments to remove fugitive materials. Deposition efficiency is also increased.
摘要:
A method for coating materials on substrates is disclosed which includes providing a dispersion of the coating material in a liquid carrier wherein the material includes individual, non-agglomerated particles having diameters of less than 500 nanometers, injecting the dispersion into a thermal spray to form droplets of liquid carrier and particles, burning the droplets of liquid carrier and particles within the thermal spray so the particles begin to melt and wherein, as the droplets burn, at least some of the particles begin to form agglomerates of particles within the droplets and directing the droplets containing the agglomerates of particles toward the substrate to coat the substrate with the particles.
摘要:
A method and apparatus are provided for protecting internal aluminum components of a plasma reactor from plasma-induced erosion. The components are coated, first with a dielectric layer, then with a thin layer of one or more metals selected from the group consisting of gold, chromium, platinum, silver and rhenium. The dielectric layer may either be grown or deposited. The metal layer is deposited, preferably using evaporative deposition.
摘要:
The cylinder walls of light metal engine blocks are thermally spray coated with a ferrous-based coating including aluminum using an HVOF device. A ferrous-based wire is fed to the HVOF device to locate a tip end of the wire in a high temperature zone of the device. Jet flows of oxygen and gaseous fuel are fed to the high temperature zone and are combusted to generate heat to melt the tip end. The oxygen is oversupplied in relation to the gaseous fuel. The excess oxygen reacts with and burns a fraction of the ferrous-based feed wire in an exothermic reaction to generate substantial supplemental heat to the HVOF device. The molten/combusted metal is sprayed by the device onto the walls of the cylinder by the jet flow of gases.
摘要:
The method for thermal spraying, especially of metals, for the coating of surfaces, wherein the material employed for coating is supplied in the form of a wire, molten and sprayed, uses a plasma arc.
摘要:
A method of repairing the tip region of combustion turbine engine blades is provided. The method includes application of a thermal barrier coating after stripping of the bond coat, repair of the blade, reapplication of the bond coat and suitable heat treatment. Blades which previously were not coated with a thermal barrier coating are candidates for repair with the methods of the present invention.