208 results about "YTTERBIUM 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.

A ceramic article which is resistant to erosion by halogen-containing plasmas used in semiconductor processing. The ceramic article includes ceramic which is multi-phased, typically including two phase to three phases. The ceramic is formed from yttrium oxide at a molar concentration ranging from about 50 mole % to about 75 mole %; zirconium oxide at a molar concentration ranging from about 10 mole % to about 30 mole %; 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 % to about 30 mole %.

This invention relates to blades for a gas turbine engine, said blades having an inner end adapted for mounting on a hub and a blade tip located opposite the inner end, and wherein at least a portion of the blade tip is coated with a thermally sprayed coating of a high purity yttria or ytterbia stabilized zirconia powder, said thermally sprayed coating having a density greater than 88% of the theoretical density with a plurality of vertical macrocracks substantially homogeneously dispersed throughout the coating in which a cross-sectional area of the coating normal to the blade tip exposes a plurality of vertical macrocracks extending at least half the coating thickness in length up to the full thickness of the coating and having from about 5 to about 200 vertical macrocracks per linear inch measured in a line parallel to the surface of the blade tip and in a plane perpendicular to the surface of the blade tip, and said high purity yttria or ytterbia stabilized zirconia powder comprising from about 0 to about 0.15 weight percent impurity oxides, from about 0 to about 2 weight percent hafnium oxide (hafnia), from about 6 to about 25 weight percent yttrium oxide (yttria) or from about 10 to about 36 weight percent ytterbium oxide (ytterbia), and the balance zirconium oxide (zirconia).

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.

This invention relates to processes for coating blades for a gas turbine engine, said blades having an inner end adapted for mounting on a hub and a blade tip located opposite the inner end, and wherein at least a portion of the blade tip is coated with a thermally sprayed coating of a high purity yttria or ytterbia stabilized zirconia powder, said thermally sprayed coating having a density greater than 88% of the theoretical density with a plurality of vertical macrocracks substantially homogeneously dispersed throughout the coating in which a cross-sectional area of the coating normal to the blade tip exposes a plurality of vertical macrocracks extending at least half the coating thickness in length up to the full thickness of the coating and having from about 5 to about 200 vertical macrocracks per linear inch measured in a line parallel to the surface of the blade tip and in a plane perpendicular to the surface of the blade tip, and said high purity yttria or ytterbia stabilized zirconia powder comprising from about 0 to about 0.15 weight percent impurity oxides, from about 0 to about 2 weight percent hafnium oxide (hafnia), from about 6 to about 25 weight percent yttrium oxide (yttria) or from about 10 to about 36 weight percent ytterbium oxide (ytterbia), and the balance zirconium oxide (zirconia).

A fuel electrode for a solid oxide electrochemical cell includes: an electrode layer including a mixed phase constituted of zirconia stabilized with yttrium oxide, ytterbium oxide, or scandium oxide and of an oxide selected from the group including an aluminum-based oxide and a magnesium-based composite oxide, said oxide having, supported on a surface part thereof, particles of at least one member selected from nickel, cobalt, and nickel-cobalt alloys; a meshy wiring formed on a surface layer part of the electrode layer and made of a material having higher electronic conductivity than the electrode layer; and a current collector which overlies the electrode layer and is in contact with at least the wiring.

A silicon nitride heat body is prepared from silicon nitride of 70-95%, Ytterbium oxide of 0.1-10%, aluminum nitride of 0-5%, boron nitride of 0-5 %, aluminum oxide of 0.1-10%, silicon oxide of 0.1-10%, cerium oxide of 0.1-10% and magnesium oxide of 0.1-10%. Its preparing method includes weight out raw materials in weight radio as said preparation and ball-grinding them for 2-48hr., drying and dry-pressing them to be biscuit, placing heat wire in biscuit for making it be green bodies being set in furnace for depasting, placing green bodies into graphite crucible and burying it in silicon nitride at furnace temperature of 1500-1800 deg.c for sintering of 0.5-4hr..

The invention relates to a transparent ceramic and a preparation method thereof; the structural formula of the transparent ceramic is LnxYbyY(3-x-y)Al5O12 or LnwYbzY(2-w-z)O3, wherein, x is not less than 0.003 and not more than 0.03, y is not less than 0.006 and not more than 1.5, w is not less than 0.002 and not more than 0.02, z is not less than 0.004 and not more than 1 and Ln represents lanthanide element Ce, Tm, Pr or Tb. The preparation method comprises the following steps: adopting yttrium oxide, aluminum oxide and ytterbium oxide of which purities are not less than 99.9% and using one of cerium oxide, thulium oxide, praseodymium oxide and terbium oxide as raw materials, proportioning the raw materials powder according to the structural formula of the transparent ceramic, preparing ceramic powder material by adopting wet milling and using absolute ethanol as medium, drying the powder, pelleting, performing, pressing with 200MPa of cold isostatic pressing and obtaining LnxYbyY(3-x-y)Al5O12 or LnwYbzY(2-w-z)O3 transparent ceramic. The invention can increase the conversion efficiency of single crystal silicon and polysilicon solar cells.

A Yb2O3 and Y2O3 stabilized zirconium oxide-type ceramic material is prepared from the zirconium oxide nanoparticles through coating by Yb2O3 and Y2O3, and non-pressure sintering to obtain tetragonal zirconium oxide polycrystal (TZP) ceramics and full-stable cubic zirconium oxide (FSZ) ceramics.

Provided is a method of producing high purity ytterbium, wherein the high purity ytterbium is obtained by reducing crude ytterbium oxide in a vacuum with reducing metals composed of metals having a low vapor pressure, and selectively distilling ytterbium. Additionally provided are methods of achieving the high purification of ytterbium which has a high vapor pressure and is hard to refine in a molten state, and high purity ytterbium obtained thereby. Further provided is technology for efficiently and stably obtaining a sputtering target made of high purity material ytterbium, and a thin film for metal gates containing high purity material ytterbium.

The invention relates to a fused silica ceramic material containing ytterbium oxide and a preparation method thereof, belonging to the field of high-temperature structural ceramic materials. The ceramic material is prepared from the following materials by weight percentage: 97% to 99% of fine fused silica powder and 1% to 3% of fine ytterbium oxide powder. The preparation method comprises the following steps: dry-mixing the fine fused silica powder and the fine ytterbium oxide powder; wet-mixing the mixture by adding polyvinyl alcohol solution as binding agent; further sieving, stirring and ageing the mixture to obtain the perform body for molding the green body; molding the green body by a hydraulic press with the molding pressure being higher than or equal to 50MPa; drying and sintering the green body at 1,200 to 1,400 DEG C; and standing for 1 to 3 hours to obtain the fused silica ceramic material containing ytterbium oxide. The invention provides a novel high-temperature structural material for glass melting, ferrous and non-ferrous metallurgy, electronics, military missiles, spacecraft and other fields in China and has wide application prospect and great significance in strengthening the national defense.

The invention discloses a holmium/ytterbium-codoped bisumth tungstate fluorescent powder and a preparation method thereof. The preparation method comprises the following steps: by using bismuth nitrate pentahydrate, sodium tungstate, holmium oxide and ytterbium oxide as raw materials and ethanediol and dilute nitric acid as solvents, mixing the solution according to the stoichiometric proportion of Bi(2-x-y)HoxYbyWO6 (0<=x<2, and 0<=y<2) to form a uniform suspension, carrying out high-temperature reaction in a hydrothermal reaction kettle, centrifugating, washing, drying, and carrying out heat treatment to obtain the holmium/ytterbium-codoped bisumth tungstate fluorescent powder. The mixing ratio and the technological parameters for hydrothermal treatment, heat treatment and the like are controlled in the preparation process to obtain the powder with different fluorescence intensity levels. The preparation method has the advantages of simple technique and procedure, wide parameter adjustable range, high repeatability and low cost, and has commercial prospects. The fluorescent powder has important application values in the fields of ceramic raw powder, visible-light photocatalysis, solar cells and photoelectric sensors.

The invention discloses a near infrared up-conversion long afterglow luminescent material and a preparation method thereof. The preparation method comprises the following steps: (1) weighing raw materials, and evenly mixing raw material powder, wherein the raw materials comprises a raw material A, a raw material B, a raw material C, and a raw material D, the raw material A is chromium oxides or corresponding salts, the raw material B is oxides of erbium or thulium or corresponding salts, the raw material C is ytterbium oxides or corresponding salts, and the raw material D is oxides of zinc, gallium/aluminum, or germanium/tin or corresponding salts; and (2) pressing and moulding mixed powder obtained in the step (1) to obtain a blank sample; (3) solid-phase sintering the blank sample obtained in the step (2) at a high temperature; and (4) cooling the sintering product to obtain the target material. A high temperature solid phase method is adopted, the prepared material, which is doped by Cr<3+> and Er<3+>/Tm<3+> and takes Yb<3+> as the sensitizing agent, has a near infrared excited up-conversion luminescence function and a super long time afterglow performance and can be used as a high performance functional material applied to related fields.

The invention discloses an ytterbium and thulium codoped dodecacalcium heptaluminate polycrystal and a preparation method thereof, relating to dodecacalcium heptaluminate polycrystal and a preparation method thereof, and solving the technical problem that the conventional blue material does not contribute to application due to wide blue wavelength distribution. The ytterbium and thulium codoped dodecacalcium heptaluminate polycrystal is prepared from calcium oxide, aluminum oxide, ytterbium oxide and thulium oxide, wherein the molar ratio of the calcium oxide to the aluminum oxide is 12:7; the amount of substance of the ytterbium oxide is 0.042-0.42 percent of that of the calcium oxide; and the amount of substance of the thulium oxide is 0.042-0.21 percent of that of the calcium oxide. The method comprises the following steps of: grinding the calcium oxide, the aluminum oxide, the ytterbium oxide and the thulium oxide powder; sheeting; and sintering under an air atmosphere to obtain the ytterbium and thulium codoped dodecacalcium heptaluminate polycrystal. Single blue light emission with wavelength of 460-490nm is obtained under excitation of light with wavelength of 980nm. The polycrystal can be used in the fields of light storage technology, optoelectronic technology, sensor technology and submarine optical cable communication.

The invention belongs to the technical field of refractory materials, and provides a silicon carbide refractory material and a preparation method thereof. The silicon carbide refractory material comprises, by weight, 25-40 parts of silicon carbide powder, 4-8 parts of silica fume , 1-5 parts of aluminum powder, 5-13 parts of titanium dioxide, 5-10 parts of zirconium oxide, 0.5-3 parts of polyhedral oligomeric silsesquioxane, 0.5-2 parts of molybdenum carbide, 0.5-2 parts of silicon boride, 0.5-1.5 parts of erbium acetate, 0.5-1.5 parts of ytterbium oxide, 1-3 parts of diamond and 3-5 parts ofbinding agent. The preparation method comprises the following steps: mixing the silicon carbide powder, the silica fume, the aluminum powder, the titanium dioxide and the zirconium oxide, grinding themixture to obtain first mixed powder, reacting the erbium acetate, the ytterbium oxide and the diamond to obtain second mixed powder, mixing the first mixed powder with the second mixed powder, mixing the obtained mixture with other components in the formula, and firing the obtained mixture to obtain the silicon carbide refractory material. By means of the technical scheme, the problems that in the prior art, a refractory material is poor in oxidation resistance and not high in strength are solved.

The invention provides a high-entropy ceramic material resistant to CMAS corrosion, a preparation method and an application thereof, the high-entropy ceramic material comprises the following raw materials: at least three of samarium oxide, europium oxide, erbium oxide and lutetium oxide, yttrium oxide and ytterbium oxide, and the amounts of substances of the raw materials are the same. The preparation method comprises the following steps: optionally selecting at least three of samarium oxide, europium oxide, erbium oxide and lutetium oxide, and conducting mixing with yttrium oxide and ytterbium oxide to obtain uniformly mixed slurry; and drying the slurry to obtain mixture powder, and carrying out pressureless calcination on the dried powder to obtain the high-entropy ceramic powder material. Analysis shows that the high-entropy ceramic powder material has the characteristics of high purity and strong CMAS corrosion resistance, the preparation method is simple and suitable for industrial production, and the high-entropy ceramic powder material has excellent application prospect in the field of thermal barrier coating materials.

The invention belongs to the field of material preparation, and particularly relates to a method for microwave sintering of a sialon ceramic material. Micro-nanoscale silicon nitride powder, aluminumnitride powder and aluminum oxide powder are adopted as the raw materials, several of yttrium oxide, ytterbium oxide, magnesium oxide, magnesium silicon nitride and samarium oxide are arbitrarily selected as the sintering aid, and microwave sintering is conducted to obtain the sialon ceramic material. According to the method, micro-nanoscale silicon nitride powder, aluminum nitride powder and aluminum oxide powder are subjected to atom replacement in the microwave sintering process, and the sintering aid is added to synthesize a required phase, so that the sintering densification temperature can be effectively reduced, the production efficiency can be improved while the microstructure of the material is more uniform, and the integration of the phase synthesis and densification process is realized. The prepared ceramic material has high hardness and good fracture toughness on the basis of guaranteeing basic complete compactness, the actual density is 3.233g/cm<3>, the Vickers hardness is 14.3GPa, and the fracture toughness is 7.28MPa.m<1/2>.

A thermal barrier coating system for metal components in a gas turbine engine having an ultra low thermal conductivity and high erosion resistance, comprising an oxidation-resistant bond coat formed from an aluminum rich material such as MCrAlY and a thermal insulating ceramic layer over the bond coat comprising a zirconium or hafnium oxide lattice structure (ZrO₂ or HfO₂) and an oxide stabilizer compound comprising one or more of the compounds ytterbium oxide (Yb₂O₃), yttria oxide (Y₂O₃), hafnium oxide (HfO₂), lanthanum Oxide (La₂O₃), tantalum oxide (Ta₂O₅) or zirconium oxide (ZrO₂). The invention includes a new method of forming the ceramic-based thermal barrier coatings using a liquid-based suspension containing microparticles comprised of at least one of the above compounds ranging in size between about 0.1 and 5 microns. The coatings form a tortuous path of ceramic interfaces that increase the coating toughness while preserving the ultra low thermal conductivity.

The invention discloses ytterbium and holmium codoped lithium niobate crystals and a preparation method thereof, and relates to doped lithium niobate crystals and a preparation method thereof, which solve the technical problems that the conventional lithium niobate crystals cannot be used as a laser crystal material. The ytterbium and holmium codoped lithium niobate crystals are prepared from niobium pentaoxide, lithium carbonate, ytterbium oxide and holmium oxide. The method comprises the following steps of: mixing the niobium pentaoxide, the lithium carbonate, the ytterbium oxide and the holmium oxide and baking to obtain polycrystal powder; growing crystals at equal diameter from the polycrystal powder in a single crystal growth furnace through seeding, necking, shouldering and folding by a crystal pulling method; and annealing to obtain the ytterbium and holmium codoped lithium niobate crystals. The ytterbium and holmium codoped lithium niobate crystals can emit red light and green light when activated by laser of 980nm and has a broad application prospect in the fields of optical data storage, submarine communication, optical display, color display, photoelectrons, medical diagnosis and the like.

The present invention features that two kinds of oxide, including ytterbium oxide and yttrium oxide, are used as the stabilizers simultaneously to coat nanometer zirconia powder and the obtained powder is sintered in the air and without pressure to obtain tetragonal zirconia polycrystal (TZP) and fully stabilized zirconia ceramic (FSZ) with low stabilizer content. The material includes Yb2O3, Y2O3 and monoclinic zirconia powder in purity over 99.9 wt%. The produced TZP ceramic contains Yb2O3 in 1.0-2.0 mol% and Y2O3 in 1.0-2.0 mol%, and the produced FSZ ceramic contains Yb2O3 in 3.0-4.0 mol% and Y2O3 in 1.0-2.0 mol%.

The embodiment of the invention discloses a thin film transistor, a display panel and a manufacturing method of the thin film transistor. The thin film transistor comprises an active layer arranged onthe surface of a glass substrate, and a source electrode and a drain electrode are connected with the active layer. A first insulating layer disposed on a side of the active layer remote from the glass substrate; A gate layer disposed on a side of the first insulating layer remote from the glass substrate; The second insulating layer covers the source electrode, the drain electrode and the gate electrode layer, and the second insulating layer is provided with a through hole, and the through hole exposes the source electrode and the drain electrode; The active layer is made of (MO) x (RO) y (TO) z, where 0 (x (1, 0001 <=y <= 0. 20, 0.0001 <=z <= 0. 20, x+y+z=1; MO is a metal oxide, and M comprises at least one of In, Zn and Ga; RO is a rare earth oxide, and RO comprises at least one of praseodymium oxide, terbium oxide, dysprosium oxide and ytterbium oxide; TO is a transition metal oxide, and TO comprises at least one of vanadium oxide, niobium oxide and tantalum oxide. Embodiments ofthe present invention provide a low cost top gate structure metal oxide thin film transistor.

The invention relates to high-temperature-resistant near-infrared absorption high-entropy ceramic and a preparation method thereof. The high-entropy ceramic is prepared from the following raw materials in equal molar ratio: 1 part of yttrium oxide, 1 part of neodymium oxide, 1 part of samarium oxide, 1 part of europium oxide, 1 part of ytterbium oxide, 1 part of erbium oxide, 1 part of niobium oxide and 1 part of tantalum oxide. The purity of the high-temperature-resistant near-infrared absorption high-entropy ceramic is not lower than 99wt%, the relative density is not lower than 98%, and theabsorptivity of the high-temperature-resistant near-infrared absorption high-entropy ceramic in a near-infrared band of 0.25-2.5 microns is not lower than 0.9. The high-temperature-resistant near-infrared absorption high-entropy ceramic is obtained by utilizing a high-entropy technology, introducing not less than 6 rare earth metal elements into niobium tantalate at the same time and adjusting the absorption energy level of the forbidden band width to enable the forbidden band width to be matched with the near-infrared wavelength, and the technological process is simple, rapid, flexible and controllable.