2732 results about "Plasma sprayed" patented technology

A plasma spray gun configured to spray semiconductor grade silicon to form semiconductor structures including p-n junctions includes silicon parts such as the cathode or anode or other parts facing the plasma or carrying the silicon powder having at least surface portions formed of high purity silicon. The semiconductor dopant may be included in the sprayed silicon.

A semiconductor processing member is provided, including a body and a plasma spray coating provided on the body. The coating is an ABO or ABCO complex oxide solid solution composition, where A, B and C are selected from the group consisting of La, Zr, Ce, Gd, Y, Yb and Si, and O is an oxide. The coating imparts both chlorine and fluorine plasma erosion resistance, reduces particle generation during plasma etching, and prevents spalling of the coating during wet cleaning of the semiconductor processing member.

A method of operation of a plasma torch and the plasma apparatus to produce a hot gas jet stream directed towards a workpiece to be coated by first injecting a cold high pressure carrier gas containing a powder material into a cold main high pressure gas flow and then directing this combined high pressure gas flow coaxially around a plasma exiting from an operating plasma generator and converging directly into the hot plasma effluent, thereby mixing with the hot plasma effluent to form a gas stream with a net temperature based on the enthalpy of the plasma stream and the temperature and volume of the cold high pressure converging gas, establishing a net temperature of the gas stream at a temperature such that the powdered material will not melt or soften, and projecting the powder particles at high velocity onto a workpiece surface. The improvement resides in mixing a cold high pressure carrier gas with powder material entrained in it, with a cold high pressure gas flow of gas prior to mixing this combined gas flow with the plasma effluent which is utilized to heat the combined gas flow to an elevated temperature limited to not exceeding the softening point or melting point of the powder material. The resulting hot high pressure gas flow is directed through a supersonic nozzle to accelerate this heated gas flow to supersonic velocities, thereby providing sufficient velocity to the particles striking the workpiece to achieve a kinetic energy transformation into elastic deformation of the particles as they impact the onto the workpiece surface and forming a dense, tightly adhering cohesive coating. Preferably the powder material is of metals, alloys, polymers and mixtures thereof or with semiconductors or ceramics and the powder material is preferably of a particle size range exceeding 50 microns. The system also includes a rotating member for coating concave surfaces and internal bores or other such devices which can be better coated using rotation.

Spherical particles of a rare earth (inclusive of yttrium)-containing compound and having a breaking strength of 10-300 MPa and an average particle diameter of 10-80 μm are suitable for plasma spraying.

A protective barrier coating system including a diffusion barrier coating and an oxidation barrier coating and method for use in protecting silicon-based ceramic turbine engine components. A complete barrier coating system includes a thermal barrier coating of stabilized zirconia and an environmental barrier coating of an alloyed tantalum oxide. The oxidation barrier coating includes a layer of metallic silicates formed on a substrate of silicon nitride or silicon carbide to be protected. The oxidation barrier coating can include silicates of scandium, ytterbia or yttrium. The oxidation barrier coating may also include an inner layer of Si₂ON₂ between the diffusion barrier and the metallic silicate layer. The oxidation barrier coating can be applied to the substrate by spraying, slurry dipping and sintering, by a sol-gel process followed by sintering, by plasma spray, or by electron beam-physical vapor deposition. The diffusion layer of essentially pure Si₃N₄ can be applied to the substrate to prevent the migration of damaging cations from the protective layers to the substrate and is preferably formed by chemical vapor deposition. A method for protecting silicon based substrates can comprise a step of forming an oxidation barrier coating on a substrate, where a step of forming the oxidation barrier includes a step of sintering the oxidation barrier and substrate in a wet gas containing hydrogen.

The invention provides a multilayer thermal barrier coating and a preparation method thereof. The multilayer thermal barrier coating sequentially comprises an adhesion layer, a first ceramic layer, a second ceramic layer and a closing layer from bottom to top, wherein the closing layer has the thickness of 10-30 micros and the porosity of 2-8 percent and is made from the Al2O3. The thermal barrier coating can be prepared by adopting an electron beam physical gas-phase deposition technology or a plasma spraying method. The multilayer thermal barrier coating provided by the invention can avoid the stripping of the ceramic layers in a thermal circulating process, the thermal erosion resistance of the thermal barrier coating is greatly improved than the dual ceramic layers; and vertical crackles are introduced in the ceramic layer through improving a conventional plasma spraying process so that the thermal shock life of the thermal barrier coating is greatly prolonged.

A corrosion resistant component of a plasma chamber includes a liquid crystalline polymer. In a preferred embodiment, the liquid crystalline polymer (LCP) is provided on an aluminum component having an anodized or non-anodized surface. The liquid crystalline polymer can also be provided on an alumina component. The liquid crystalline polymer can be deposited by a method such as plasma spraying. The liquid crystalline polymer may also be provided as a preformed sheet or other shape adapted to cover the exposed surfaces of the reaction chamber. Additionally, the reactor components may be made entirely from liquid crystalline polymer by machining the component from a solid block of liquid crystalline polymer or molding the component from the polymer. The liquid crystalline polymer may contain reinforcing fillers such as glass or mineral fillers.

Monazites and xenotimes are rare-earth phosphates showing a combination of properties expected to be suitable for thermal barrier coatings. For example, lanthanum phosphate (La-monazite) can be used to form thermal barrier coatings to protect superalloy and ceramic parts exposed to high temperature and damage by sulfur, vanadium, phosphorus and other contaminants. The monazite or xenotime coatings can be applied using any of the common application methods including EB-PVD, laser ablation and plasma spraying. The stoichiometry of the coatings can be modulated according to the stoichiometry of specially prepared starting target (source) material. The most effective coatings appear to be largely crystalline and show a columnar structure with feather-like microstructure. For La-monazite, effective coatings between 10 and 500 micrometers in thickness can be deposited on substrates having temperatures between about 750° C. and about 950° C.

A prosthesis having an oxidized zirconium surface and a porous textured surface is described. A major advantage of the prosthesis is increased service life. Additionally, a process of manufacturing the prosthesis is described.

The invention relates to a nanometer zirconium oxide thermal barrier coating and a preparation method thereof. The nanometer zirconium oxide thermal barrier coating is characterized by comprising an adhesive layer and a ceramic layer, wherein NiCrAlY is prepared on the adhesive layer by adopting supersonic flame spraying and comprises the following components in percentage by weight: 20-30% of Cr, 4.0-10% of Al, 0.3-0.7% of Y, and the balance of Ni; a ZrO2/Y2O3 layer is prepared as the ceramic layer by adopting plasma spraying, the ceramic layer is a nanometer zirconium oxide layer comprising5%-8% of partially stable yttrium oxide, and zirconium oxide powder is at a nanometer grade. The oxidation-resisting thermal barrier coating is prepared on a metal surface by combining the supersonic flame spraying with the plasma spraying, has better combining capacity with a base body and both thermal shock resistance and thermal insulation superior to those of a common ZrO2/Y2O3 thermal barrier coating.

The invention provides a gasification process for producing synthesis gas from garbage and biomass raw materials, which relates to a gasification processing technique of garbage and biomasses. The gasification process is characterized in that the technological process mainly comprises a raw material solid matter process, a gas phase circulation loop, a calcium oxide circulation loop and a synthesis gas drawing process; one or a mixture of more garbage, the biomasses and coal is sent into a gasification furnace to perform gasification so as to generate the synthesis gas; and simultaneously, calcium oxide is sent into the gasification furnace, an exothermic reaction of absorbing carbon dioxide by the calcium oxide provides the heat required by the gasification reaction in the furnace, and water vapor is sent into a plasma spraying gun and is heated to more than 3,100 DEG C to generate H2, O, O2 and H2O<*> which are sprayed into the gasification furnace to perform reactions with the garbage and the biomasses and supply heat into the furnace. The gasification process adopts a measure to spray the calcium oxide into the furnace to not only greatly reduce the electric energy consumption of the plasma spraying gun, but also improve the quality and the yield of the synthesis gas, thus the aim of transforming the garbage and the biomasses into clean energy can be achieved easily.

The invention belongs to a process for preparing and processing powder material by taking plasma as a heat source, in particular to a process and an apparatus of metal titanium powder material for powder metallurgy, plasma spray, injection forming, gel injection molding and the like. The invention has the advantages that: the adoption of the high temperature spheroidization and rapid condensation special spheroidization technique can improve the sphericity and purity of titanium powder, and both a reactor and the titanium powder spheroidization process are cooled with circulating water, thereby ensuring the sealing performance of equipment, also reducing the use of inert gases, effectively reducing costs, improving the production efficiency and guaranteeing the purity of spherical titanium powder.

The invention provides a non-stick pan coating layer and a preparation method thereof. The coating layer comprises Al-Cu-Fe-Cr-B quasicrystalline alloy which has components as follows by the atomic percentage: 70-90 of Al, 1-15 of Cu, 5-15 of Fe, 5-15 of Cr, and the balance of B and unavoidable impurity. The method comprises the specific steps as follows: (1) smelting alloy materials with a spraying device at a temperature of 900-1100 DEG C to prepare alloy powder; (2) spraying the alloy coating layer on a boiler basal body with a plasma spraying device, with a main gas feed rate of 65 L/min, a secondary gas feed rate of 20-30 L/min, an arc current of 550-590A, an arc voltage of 45-60V, a powder delivering amount of 10-15 g/min, and a coating layer thickness of about 100-200 micro. At a cooking temperature, the invention has the advantages of stable chemical property, large rigidness, lower cost than Teflon or organic silicon, low surface friction coefficient, and the like.

Coating system for reducing CMAS infiltration of substrates includes at least an inner ceramic layer and an outer alumina-containing layer. The outer layer includes up to 50 percent by weight titania. Additional ceramic layers and alumina-containing layers may be provided. The coating may be used for gas turbine engine components. Deposition techniques for the coating layers may depend on the end use of the component. Coated articles include a substrate, an optional bond coat on the substrate and a coating over the bond coat or on at least a portion of the substrate in the absence of a bond coat. The inner ceramic layer(s) exhibit a microstructure indicative of a deposition technique selected from thermal spray, physical vapor deposition, and suspension plasma spray, whereas the outer alumina-containing layer exhibits a microstructure indicative of suspension plasma spray, solution plasma spray, and a high velocity oxygen fuel spray.