422 results about "Yttria-stabilized zirconia" patented technology

Implementations described herein protect a chamber components from corrosive cleaning gases used at high temperatures. In one embodiment, a chamber component includes at least a bellows that includes a top mounting flange coupled to a bottom mounting flange by a tubular accordion structure. A coating is disposed on an exterior surface of at least the tubular accordion structure. The coating includes of at least one of polytetrafluoroethylene, parylene C, parylene D, diamond-like carbon (DLC), yttria stabilized zirconia, nickel, alumina, or aluminum silicon magnesium yttrium oxygen compound. In one embodiment, the chamber component is a valve having an internal bellows.

A method and superalloy component for depositing a layer of material onto gas turbine engine components by atomic layer deposition. A superalloy component may have a ceramic thermal barrier coating on at least a portion of its surface, comprising a superalloy substrate and a bonding coat; and aluminum oxide (Al₂O₃) layer may be deposited on top of an yttria-stabilized zirconia layer and form a bonding coat by atomic layer deposition. The yttria-stabilized zirconia layer may have a plurality of micron sized gaps extending from the top surface of the ceramic coating towards the substrate and defining a plurality of columns of the yttria-stabilized zirconia layer. Also, atomic layer deposition may be used to lay an aluminum oxide (Al₂O₃) layer over a tantalum oxide (Ta₂O₅) layer on a silicon-based substrate. Using atomic layer deposition to coat the gas turbine engine components permits conformal coating of the columnar surface to permit gap expansion and contraction without sintering of the columnar surface or spalling of the coating, and form an oxidation resistant bonding coat.

According to an embodiment of the invention, a method for repairing a coated high pressure turbine blade, which has been exposed to engine operation, to restore coated airfoil contour dimensions of the blade, is disclosed. The method comprises providing an engine run high pressure turbine blade including a base metal substrate made of a nickel-based alloy and having thereon a thermal barrier coating system. The thermal barrier coating system comprises a diffusion bond coat on the base metal substrate and a top ceramic thermal barrier coating comprising a yttria stabilized zirconia material. The top ceramic thermal barrier coating has a nominal thickness t. The method further comprises removing the thermal barrier coating system, wherein a portion of the base metal substrate also is removed, and determining the thickness of the base metal substrate removed. The portion of the base metal substrate removed has a thickness, Δt. The method also comprises reapplying the diffusion bond coat to the substrate, wherein the bond coat is reapplied to a thickness, which is about the same as applied prior to the engine operation; and reapplying the top ceramic thermal barrier coating to a nominal thickness of t+Δt, wherein Δt compensates for the portion of removed base metal substrate. Advantageously, the coated airfoil contour dimensions of the high pressure turbine blade are restored to about the coated dimensions preceding the engine run.

This invention relates to thermal spray coatings on a metal or non-metal substrate. The thermal spray coating comprises a partially or fully stabilized ceramic coating, e.g., yttria stabilized zirconia coating, and has sufficiently high thermodynamic phase stability to provide corrosion and/or erosion resistance to the substrate. This invention also relates to methods of protecting metal and non-metal substrates by applying the thermal spray coatings. The coatings are useful, for example, in the protection of integrated circuit manufacturing equipment, internal chamber components, and electrostatic chuck manufacture.

In one aspect, the invention includes a refractory material for a pyrolysis reactor for pyrolyzing a hydrocarbon feedstock, the refractory material comprising an yttria stabilized zirconia, the refractory material comprising at least 21 wt. % yttria based upon the total weight of the refractory material. In another aspect, this invention includes a method for mitigating carbide corrosion while pyrolyzing a hydrocarbon feedstock at high temperature using a pyrolysis reactor system comprising the steps of: (a) providing a pyrolysis reactor system comprising stabilized zirconia in a heated region of the reactor, the stabilized zirconia including at least 21 wt. % yttria and having porosity of from 5 vol. % to 28 vol. %; (b) heating the heated region to a temperature of at least 1500° C.; and (c) pyrolyzing a hydrocarbon feedstock within the heated region.

An ultraviolet-light-emitting semiconductor diode comprising an n-type ZnO layer with luminous characteristics formed on a transparent substrate, and a p-type semiconductor layer selected from the group consisting of SrCu2O2, CuAlO2 and CuGaO2, which is formed on the n-type ZnO layer to provide a p-n junction therebetween. The transparent substrate is preferably a single crystal substrate having atomically flat yttria-stabilized zirconia (YSZ) (III) surface. The n-type ZnO layer is formed on the transparent substrate having a temperature of 200 to 1200° C., and the p-type semiconductor layer selected from the group of SrCu2O2, CuAlO2 and CuGaO2 is formed on the n-type ZnO layer. The n-type ZnO layer may be formed without heating the substrate, and then the surface of the ZnO layer may be irradiated with ultraviolet light to promote crystallization therein.

A ceramic-ceramic nanocomposite electrolyte having enhanced conductivity is provided. The nancomposite electrolyte is formed from chemically stabilized zirconia such as yttria stabilized zirconia or scandia stabilized zirconia and a heterogeneous ceramic dopant material such as Al₂O₃, TiO₂, MgO, BN, or Si₃N₄ The nanocomposite electrolyte is formed by doping the chemically stabilized zirconia with the ceramic dopant material and pressing and sintering the composite. The resulting electrolyte has a bulk conductivity of from about 0.10 to about 0.50 S/cm at about 600° C. to about 900° C. and may be incorporated into a solid oxide fuel cell.

Thermal barrier coating systems for use with hot section components of a gas turbine engine include an inner layer overlying a bond coated substrate and a top layer overlying at least a portion of the inner layer. The inner layer includes a thermal barrier material such as yttria-stabilized zirconia. The top layer includes a rare earth aluminate. The thicknesses and microstructures of the layers may be varied depending on the type of component to be coated. Articles incorporating the thermal barrier coating system exhibit improved resistance to CMAS infiltration

A turbine engine component is provided which has a substrate and a thermal barrier coating applied over the substrate. The thermal barrier coating comprises alternating layers of yttria-stabilized zirconia and a molten silicate resistant material. The molten silicate resistant outer layer may be formed from at least one oxide of a material selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, indium, zirconium, hafnium, and titanium or may be formed from a gadolinia-stabilized zirconia. If desired, a metallic bond coat may be present between the substrate and the thermal barrier coating system. A method for forming the thermal barrier coating system of the present invention is described.

The invention relates to yttria-stabilized zirconia powder and a preparation method thereof. The yttria-stabilized zirconia powder has the composition characteristics that yttria is taken as a stabilizer of a zirconia material; the powder comprises a doping system formed by one or more following third components: alumina, ceria, lanthana, copper oxide, magnesium oxide and calcium oxide, wherein the weight of the yttria is 2-8mol%, and the total doping weight of the alumina, the ceria, the lanthana, the copper oxide, the magnesium oxide and the calcium oxide is 0-5wt%. According to the yttria-stabilized zirconia powder and the preparation method, the deficiencies of an existing liquid phase preparation process of nanometer zirconia powder are overcome, and the prepared nanometer ZrO2 composite powder has the performance of uniformity in dispersion of components, uniform grain size, super-fineness, high sintering activity, good liquidity and the like. Furthermore, the preparation method is simple in process and low in cost and is easy to industrialize.

A thermal barrier coating system on a base material includes a bond coat layer with a lower face in direct contact with the base material and an upper face, a first ceramic layer in direct contact with the upper face of the bond coating layer and a second ceramic layer disposed on an outermost surface of the coating system and configured to be exposed to hot gas. The first ceramic layer includes a layer, combination, mixture, alloy, blend or multilayer structure of at least one of yttria-stabilized zirconia with a yttria content in a range of 6-8 wt-%, YTaO4 doped zirconia, and titania doped zirconia. The second ceramic layer includes a layer, combination, mixture, alloy, blend or multilayer structure of at least one of YTaO4 doped zirconia, titania doped zirconia, scandia stabilized zirconia, ceria containing perovskite material, yttrium aluminium garnet material, Monazite material, and spinel material. A material of the second ceramic layer is different from a material of the first ceramic layer.

A method for preparation of an anode for a solid oxide fuel cell in which a plurality of zircon fibers are mixed with a yttria-stabilized zirconia (YSZ) powder, forming a fiber/powder mixture. The fiber/powder mixture is formed into a porous YSZ layer and calcined. The calcined porous YSZ layer is then impregnated with a metal-containing salt solution. Preferred metals are Cu and Ni.

The invention relates to a light-weight, high temperature-resistance and heat-insulation ceramic fiber tile and a making method thereof. The heat insulation tile comprises ceramic fibers and boron oxide, wherein the ceramic fibers comprise quartz fibers, alumina fibers and yttrium oxide stabilized zirconia fibers. The making method of the light-weight, high temperature-resistance and heat-insulation ceramic fiber tile comprises the following steps: preparing a sintering aid suspension, preparing a ceramic fiber slurry, carrying out wet green body molding, drying the obtained wet green body, and carrying out pressurization sintering. The heat insulation tile has good heat insulation effect and mechanical performances, has light weight and resists high temperature; the density is controllable between 0.10g/cm<3> and 0.90g/cm<3>; the lowest apparent heat conduction coefficient at room temperature reaches 0.033W/(m.K); the compressive strength at room temperature is greater than 3.0Mpa; and the long-time use temperature can reach 1350DEG C.

The invention, belonging to the technical field of zirconia ceramic, discloses a zirconia ceramic and a preparation method thereof. The ceramic comprises matrix, sintering aid, neodymium oxide and additive, wherein, the matrix is yttria stabilized zirconia, the additive is selected from one or more of zinc oxide, barium carbonate and calcium fluoride, and the diffraction peak of the XRD appears when the 2 theta is 34.8-36.2 degrees. The zirconia ceramic has stable and beautiful purple. The preparation method comprises the following steps: adding neodymium oxide particles in a diethanolamine solution for soaking, then carrying out solid-liquid separation; carrying out ball mill mixing of the matrix, processed neodymium oxide particles, sintering aid and additive, then carrying out die forming and high temperature sintering. The preparation method provided by the present invention is simple and easy, and is suitable for large-scale industrial production.

The invention belongs to the technical field of gas sensors, and particularly relates to a mixed-potential nitrogen dioxide sensor with an efficient three-phase interface based on a porous YSZ (yttria stabilization zirconia) substrate and a preparation method for the sensor. The sensor is mainly used for detecting automobile exhaust, and sequentially comprises an Al2O3 ceramic plate, the porous YSZ substrate, a Pt (platinum) reference electrode and an MnCr2O4 sensitive electrode, wherein the Al2O3 ceramic plate is provided with a Pt heating electrode, one side of the porous YSZ substrate is provided with a pore-forming surface, both the reference electrode and the sensitive electrode are bar-shaped and symmetrically positioned at two ends of the pore-forming surface of the porous YSZ substrate close to a boundary, the porous YSZ substrate is provided with a planar double-layer structure, the surface of the porous YSZ substrate is rough and porous, and the porous YSZ substrate is prepared by casting YSZ slurry added with pore-forming agent starch on a YSZ cast biscuit after low-temperature degreasing and high-temperature sintering. By using MnCr2O4 as the sensitive electrode and adding the three-phase interface of the mixed-potential NO2 sensor, sensitivity of the sensor is enhanced.

Methods for providing improved resistance to CMAS infiltration for hot section components of a gas turbine engine. Exemplary methods include coating a substrate with a thermal barrier coating system by overlying a bond coated substrate with an inner thermal barrier layer comprised of a thermal barrier material such as yttria-stabilized zirconia. A top layer, including a rare-earth aluminate, is deposited so as to overlie at least a portion of the inner layer. Deposition processes and coating thicknesses may be tailored to the type of component to be coated.

The invention relates to a method for recovering zirconia and yttria from the yttria-stabilized zirconia solid solution waste, which comprises the following steps: mixing the solid solution waste powder, sulfate and salt; acidizing and calcining at 200 to 320 DEG C; leaching the acidizing water and/or mother liquor under self-heating conditions; concentrating the leaching solution to leach zirconium sulfate; dissolving the zirconium sulfate in the water and purifying; neutralizing the zirconium hydroxide with alkali and precipitating; calcining the zirconium hydroxide to obtain zirconia; precipitating zirconium mother liquor to produce by-product of ammonium sulfate; neutralizing yttrium rich mother liquor and precipitating to obtain yttrium; dissolving yttrium rich residue with acid and purifying; precipitating oxalate to obtain yttrium oxalate; calcining to obtain the yttria. The method has the advantages of effectively separating the yttria from the zirconia in stable zirconia solid solution waste with optional yttrium ion under low temperature condition, changing the zirconia solid solution waste into valuables and utilizing the resources.

A solid oxide fuel cell anode is comprised of a nickel foam or nickel felt substrate. Ceramic material such as yttria stabilized zirconia or the like is entrained within the pores of the substrate. The resulting anode achieves excellent conductivity, strength and low coefficient of thermal expansion characteristics while effectively reducing the overall quantity of nickel contained in the fuel cell. Equivalent or better fuel cell anode characteristics result in the present invention as compared to conventional anode designs while simultaneously employing significantly less nickel.

An object is to provide a semiconductor device including a microcrystalline semiconductor film with favorable quality and a method for manufacturing the semiconductor device. In a thin film transistor formed using a microcrystalline semiconductor film, yttria-stabilized zirconia having a fluorite structure is formed in the uppermost layer of a gate insulating film in order to improve quality of a microcrystalline semiconductor film to be formed in the initial stage of deposition. The microcrystalline semiconductor film is deposited on the yttria-stabilized zirconia, so that the microcrystalline semiconductor film around an interface with a base particularly has favorable crystallinity while by crystallinity of the base.

The invention discloses methods of producing thermally stable mesoporous transition metal oxide compositions by aqueous co-assembly of glycometallates and metal complexes with a surfactant template, without the necessity of the use of stabilizers. Mesoporous (nickel/platinum)-yttria-zirconia materials are also disclosed for use as electrode materials in solid oxide fuel cells. These materials display the highest surface area of any form of (metal)-yttria-stabilized-zirconia, thereby providing significant improvement in the efficiency of solid oxide fuel cells.

The invention discloses an aqueous solar energy heat-absorbing coating. The uniformly mixed aqueous solar energy heat-absorbing coating is prepared by carrying out defibrination on an organosilicone-modifed acrylic emulsion (silicone-acrylic emulsion), sulfonated graphene, Co-Al2O3 nano-composite powder, yttria-stabilized zirconia powder, SiC powder, superfine iron powder, superfine nickel powder, flake graphite powder, silica sol, deionized water, a flatting agent and a wetting agent in a sand grinding machine at the room temperature in a certain proportion. The aqueous solar energy heat-absorbing coating has the properties that the absorptivity is 0.90-0.94, the emissivity is 0.18-0.20, the coating adhesive force is 4B-5B level, the pencil hardness is H, and the stability and the environmental protection property are high; the aqueous solar energy heat-absorbing coating is simple in preparation process, low in cost, suitable for industrial production and especially applicable to solar energy heat-absorbing coatings of a solar heat absorber.

The invention discloses a SiC-based MOSFET (metal-oxide -semiconductor field effect transistor) oxysensible sensor for an automobile engine and a manufacturing method thereof. Silicon carbide material with the excellent characteristics of wide energy gap, high breakdown electric field, high electron saturated drifting velocity, high heat conductivity and the like is used as a P-type substrate of an N-type channel MOSFET, thereby meeting the requirement of high-temperature working. In the MOSFET structure, a layer of oxysensible film material (such as YSZ: yttria stabilized zirconia) grows on an original gate oxide layer, wherein metal Pt is adopted as a metal gate electrode, and the channel of a MOSFET type oxysensible sensor can be a surface channel and an embedded channel. In the sensor, the change of oxygen concentration can be converted into the change of capacitance of the gate oxide layer in unit area, thereby causing the change of a threshold voltage. Besides, the invention also discloses a method for manufacturing the MOSFET type oxysensible sensor.

The invention provides a surface-modified high-nickel ternary positive material. A surface modification layer is covered on an inner core of a high-nickel ternary positive material; the inner core ofthe high-nickel ternary positive material is Li1 plus kNixCoyMzO2, wherein k is larger than or equal to -0.1 and smaller than or equal to 0.1, x is larger than 0 and smaller than 1, y is larger than 0and smaller than 1, and z is larger than 0 and smaller than 1. The surface modification layer is formed by two surface modification matters, wherein one is yttria-stabilized zirconia, and the other one is selected from one or more of metal oxide MeOx, metal fluoride MeFx, metal phosphate Me(PO4)x or C. The invention also provides a preparation method of the surface-modified high-nickel ternary positive material, and a battery prepared from the surface-modified high-nickel ternary positive material. According to the surface-modified high-nickel ternary positive material provided by the invention, the surface modification matters are covered on the surface of the body material, so that the side reaction of the high-nickel ternary positive material and an electrolyte is reduced, the irreversible capacity loss of the material is inhibited, and the cycle performance is improved.