1498 results about "Yttrium(III) oxide" patented technology

Embodiments of the present invention generally relate to heated substrate supports having a protective coating thereon. The protective coating is formed from yttrium oxide at a molar concentration ranging from about 50 mole percent to about 75 mole percent; zirconium oxide at a molar concentration ranging from about 10 mole percent to about 30 mole percent; and at least one other component, selected from the group consisting of aluminum oxide, hafnium oxide, scandium oxide, neodymium oxide, niobium oxide, samarium oxide, ytterbium oxide, erbium oxide, cerium oxide, and combinations thereof, at a molar concentration ranging from about 10 mole percent to about 30 mole percent. The alloying of yttrium oxide with a compatible oxide improves wear resistance, flexural strength, and fracture toughness of the protective coating, relative to pure yttrium oxide.

An erosion-resistant article for use as a component in plasma process chamber. The erosion-resistant article comprises a support and an oxide coating comprising yttrium, which is disposed over the support. The support and the oxide coating preferably have material compositions that differ from one another in coefficient of thermal expansion by no more than 5x10<-6>/K. Preferred oxide coating compositions include yttria and yttrium aluminum garnet. Preferred supports include alumina supports and aluminum-silicon carbide supports.

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.

The invention discloses a preparation method of a directional solidification high-niobium TiAl-base alloy, which belongs to the field of metal material preparation. The high-niobium TiAl-base alloy contains Ti, Al, Nb, W, Mn, C, B and Y, and the atomic percentage is: (43-49) Ti-(45-46) Al-(6-9) Nb-(0-0.5) (W and Mn)-(0-0.5) (C and B)-(0-0.5) Y, an as-cast master alloy rod which is smelted by plasma arc or vacuum suspension is taken as a raw material, a high-purity alumina ceramic tube with a coating layer of which the main component is yttrium oxide is used as a crucible, Ga-In-Sn alloy liquid is cooling liquid, and the directional solidification high-niobium TiAl-base alloy is successfully prepared by using an improved zone-melting and directional solidification system. The processing technology is simple and reliable, the directional solidification effect is obvious, and the method has universal applicability. The directional solidification high-niobium TiAl-base alloy which is prepared by the directional solidification method has comprehensive and good high temperature performance and room temperature ductility and has wide application prospect in terms of high temperature structural materials.

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.

The invention provides a hydrothermal synthesis method for IVB-group metal oxide. The IVB-group metal oxide is the oxide of titanium, zirconium or hafnium. The method comprises: adding IVB-group metal salt solution to alkaline precipitant and obtaining hydroxide precipitate; washing and precipitating to remove other impurities; adding water to the hydroxide precipitate to prepare suspension liquid and then performing hydrothermal reaction to obtain metal-oxide suspension liquid; and performing post-treatment to the metal-oxide suspension liquid to obtain metal oxide powder. The hydrothermal synthesis method can form zirconia powder through reaction at low temperature, thereby overcoming the disadvantage of using a co-precipitation method to product zirconia, avoiding powder agglomeration caused by high-temperature calcinations, ensuring the extremely excellent performance of the obtained zirconia powder and having the advantages of uniform particle size, good dispersity, strong maneuverability and the like. According to the hydrothermal synthesis method, zirconia composite material can also be produced by further adding stabilizers, such as yttrium-oxide compound zirconia, magnesium-oxide compound zirconia, cerium-oxide compound zirconia, calcium-oxide compound zirconia and the like.

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 provides a method for preparing a nano oxide dispersion reinforced superfine crystal tungsten-based composite material. The method comprises the following steps of: taking 0.1 to 1 weight percent of micro tungsten powder, nano yttrium oxide powder or yttrium metal powder and 0 to 2 weight percent of titanium metal powder or molybdenum powder or tantalum powder, blending the materials, mechanically alloying the materials, sintering discharge plasma and the like to prepare the superfine crystal tungsten composite material. The method has the following advantage that: the nearly full-densification superfine crystal tungsten-based composite material can be obtained by the method for preparing the nano oxide dispersion reinforced superfine crystal tungsten-based composite material. Complex phase doping of yttrium oxide or yttrium metal and titanium metal, molybdenum or tantalum powder not only realizes sintering densification of tungsten at a lower temperature, but also inhibits grain growth of tungsten crystals during sintering. The tungsten crystal grain size of the yttrium oxide reinforced superfine crystal tungsten-based composite material prepared by adopting the method is less than or equal to 3 microns, and the composite material has good mechanical property and thermal shock resistance.

The invention discloses a thermostable white nano far-infrared ceramic powder and a preparation method thereof. The thermostable white nano far-infrared ceramic powder is prepared from the following components in percentage by weight: 20-30% of nano alumina, 3-8% of nano magnesia, 15-25% of nano monox, 10-20% of nano zirconia, 15-25% of nano zinc oxide, 7-10% of nano titanium oxide, 1-3% of nano rare earth oxide and 0.1-0.3% of nano precious metal oxide. In the invention, the nano rare earth oxide is one of yttrium oxide or lanthana or cerium oxide, and the nano precious metal oxide is one of platinum oxide or palladium oxide. The nano far-infrared ceramic powder can be subjected to subsequent processing at the high temperature of 1300-1450 DEG C, without reduction of radiance and radiation intensity, wherein the radiance can reach 0.90-0.94, and the nano far-infrared ceramic powder is white and can be widely applied to far-infrared household porcelain, wall and floor tiles, heating ceramic plates and high-temperature coating.

The invention discloses black zirconia ceramic material composition which comprises the following components in percentage by mass: 0-5% of ferric oxide, 0-5% of cobaltous oxide, 0-5% of chromic oxide, 0-5% of aluminum oxide, 0-5% of nickel oxide, 0-5% of manganese oxide, 0-5% of zinc oxide, 2-6% of yttrium oxide, 0-5% of titanium oxide, 0-5% of silicon dioxide, 0-5% of cerium oxide and the balance of zirconium oxide containing hafnium oxide. The black zirconia ceramic material composition disclosed by the invention is small in powder granularity and uniform in distribution, and black zirconia ceramic containing the black zirconia ceramic material composition is relatively good in covering power, high in blackness and relatively low in transmittance of light. Meanwhile the invention further discloses black zirconia ceramic prepared from the black zirconia ceramic material composition and a preparation method of the black zirconia ceramic.

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 discloses a rare earth doped yttrium oxide fluorescent nano-fiber and a preparation method thereof. The nano-fiber comprises yttrium oxide and rare earth oxide, wherein the yttrium oxide accounts for 70-99.9 percent by weight, and the rare earth oxide accounts for 0.01-30 percent by weight. The diameter of the rare earth doped yttrium oxide fluorescent nano-fiber is 50-1000nm, and the nano-fiber is provided with small holes or small balls with diameters being 5-80nm. The preparation method comprises the following steps: preparing electrostatic spinning solution, making the electrostatic spinning solution into a composite nano-fiber precursor with spinning polymer resin, yttrium salt and rare earth salt through electrostatic spinning equipment under high-voltage electrostatic electricity, drying the composite nano-fiber precursor with the spinning polymer resin, the yttrium salt and the rare earth salt, and calcining to obtain the rare earth doped yttrium oxide fluorescent nano-fiber. The prepared rare earth doped yttrium oxide fluorescent nano-fiber has the advantages of large specific surface area, high fluorescence, easy recovery and recyclable property, and is applicable to biological sensors, field emission displays and other fields.

Particulate generation has been a problem in semiconductor device processing in highly corrosive plasma environments. The problem is exacerbated when the plasma is a reducing plasma. Empirically produced data has shown that the formation of a plasma spray coated yttrium-comprising ceramic such as yttrium oxide, Y2O3-ZrO2 solid solution, YAG, and YF3 provides a low porosity coating with smooth and compacted surfaces when such ceramics are spray coated from a powder feed having an average effective diameter ranging from about 22 [mu]m to about 0.1 [mu]m. These spray-coated materials reduce the generation of particulates in corrosive reducing plasma environments.

The present invention provides a component for a plasma processing apparatus, the component comprising: a base material; an underlayer covering a surface of the base material; and an yttrium oxide film covering a surface of the underlayer, wherein the underlayer comprises a metal oxide film having a thermal conductivity of 35 W/m·K or less, the yttrium oxide film contains at least either particulate portions made of yttrium oxide or non-particulate portions made of yttrium oxide, the particulate portions being portions where a grain boundary demarcating an outer portion of the grain boundary is observed under a microscope, and the non-particulate portions being portions where the grain boundary is not observed under a microscope, the yttrium oxide film has a film thickness of 10 μm or more and a film density of 96% or more, and when a surface of the yttrium oxide film is observed under a microscope, an area coverage ratio of the particulate portions is 0 to 20% in an observation range of 20 μm×20 μm and an area coverage ratio of the non-particulate portions is 80 to 100% in the observation range.

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.

The present invention belongs to the field of nano fluorescent material. Lanthanum oxide (or yttrium or gadolinium oxide), ytterbium oxide and erbiom oxide (or thulium or holmium oxide) are first dissolved in acid to prepare solution; complexone and sodium or potassium molybdenate are added into the solution to produce precipitate, which is centrifugally separated and water washed to prepare aqueous gel, aqueous gel or further prepared alcoholic gel is finally cinerated in a high temperature furnace or heated in a hydrothermal reactor to obtain the nano level up converting fluorescent material. The said material has lanthanum molybdenate as matrix and ytterbium molybdenate and erbium molybdenate as dopant. The material thus prepared has small and homogeneous size, average size 50-60 nm and high light glowing strength and may meet the requirement as biological molecular fluorescent mark material.