14 results about "Bismuthate" patented technology

The invention discloses an LTCC (Low Temperature Co-Fired Ceramic) green tape as well as a preparation method and application thereof, and the preparation method comprises the following steps: mixing LTCC formula powder and additive phase powder to obtain mixed powder; mixing the mixed powder, a dispersing agent and a solvent, and performing first ball milling treatment to obtain a first ball milling product; adding an adhesive and a plasticizer into the first ball-milling product, and carrying out second ball-milling treatment to obtain a second ball-milling product; filtering the second ball-milled product to obtain ceramic slurry for tape casting; drying the casting ceramic slurry to obtain an LTCC (Low Temperature Co-Fired Ceramic) green tape; wherein the weight ratio of the LTCC formula powder to the additive phase powder is (50-95): (5-50); the LTCC formula powder comprises ceramic powder and glass powder; the additive phase powder is at least one of hexagonal boron nitride, fluorophlogopite sheets, bismuthate-based tungsten bronze and phosphate glass. According to the LTCC green tape prepared by the preparation method disclosed by the invention, the technical problem that the machinability and the thermal conductivity of an LTCC green substrate prepared by an existing LTCC green tape are relatively poor can be solved.

The invention relates to lead-free glass-coated copper powder for an HJT photovoltaic cell, conductive copper paste and a preparation method of the lead-free glass-coated copper powder and the conductive copper paste, the glass-coated copper powder comprises nano-copper powder and a coating layer on the surface of the nano-copper powder, and the coating layer is composed of bismuthate glass. According to the preparation method, a sol-gel method is adopted, the bismuthate glass is coated on the nano copper powder, the glass and the copper powder form a core-shell structure, the glass can be molten into a liquid phase during sintering, the contact between the glass and the copper powder is more uniform, and the oxidation resistance of the copper powder is enhanced. The prepared glass-coated copper powder can effectively isolate the copper powder from being in contact with an external oxidizing agent, excellent anti-oxidation protection is provided, the rapid oxidation point of the copper powder is increased by 100-150 DEG C compared with the rapid oxidation point of the copper powder before coating, and the service life of the copper powder is prolonged; meanwhile, the conductive copper paste has high stability, high reliability, low cost and high conductivity, and meets the environmental protection requirement.

The invention discloses bismuthate glass. The bismuthate glass is prepared from the following main raw materials: 50 to 83 weight percent of Bi2O3, 10 to 20 weight percent of B2O3, 3 to 10 weight percent of ZnO, 3 to 10 weight percent of SiO2 and 3 to 10 weight percent of Al2O3; 0-4wt% of TiO2 is added on the basis of the total weight of the main raw materials. The invention further discloses a coating based on the bismuthate glass. The reflection performance of the glass coating is remarkably improved, the radiation refrigeration effect of the glass ceramic coating is remarkably improved, and the glass ceramic coating has the radiation protection, insulation and anti-static effects.

The application discloses an optical matching layer and a preparation method thereof, and the optical matching layer is composed of an epoxy resin matrix and surface-modified glass micro-powder fillers dispersed in the epoxy resin matrix; the modified glass micro-powder fillers are bismuthate glass micro-powder treated by a silane coupling agent; and the chemical composition of the bismuthate glass micro-powder is 54‑56mol%Bi2O3 、 28‑32mol%B2O3 , 14-16 mol% ZnO. By using the bismuthate glass matched in refractive index, light scattering is fundamentally reduced. Optical simulation (based on Mie scattering theory) shows that the light transmittance of the composite material is as high as 86.5% at 30% volume fraction, which is significantly better than that of a silica composite material with a light transmittance of 58.2% under the same conditions.

The invention provides a chemical mechanical polishing composition for polishing a silicon carbide substrate and a polishing method thereof. The chemical mechanical polishing composition comprises cerium oxide abrasive particles, an oxidizing agent and an oxidizing agent regenerant. Wherein the oxidant comprises permanganate, and the permanganate is reduced into Mn < 2 + > ions in the oxidation reaction process; and an oxidant regenerant comprising bismuthate that oxidizes the Mn < 2 + > ions to permanganate, thereby maintaining the concentration of the permanganate in the composition.

The invention discloses a supported copper-based nanorod heterojunction photocatalyst as well as a preparation method and application thereof. The heterojunction composite photocatalytic material provided by the invention comprises the following components: a carrier copper bismuthate nanorod and ZIF-67 on the surface of the carrier copper bismuthate nanorod. The preparation method comprises the following steps: adding a copper source and a bismuth source into water, and carrying out hydrothermal reaction to obtain a copper bismuthate nanorod CuBi2O4; mixing the obtained copper bismuthate nanorod with a cobalt source and an imidazole compound, stirring, and growing a ZIF-67 dodecahedron on the surface of the copper bismuthate nanorod in situ to obtain the heterojunction composite photocatalytic material ZIF-67 / CuBi2O4. The ZIF-67 / copper bismuthate heterojunction photocatalyst prepared by the invention has good photosensitivity, and can meet the requirement of producing methane by photocatalytic reduction of carbon dioxide; as a heterojunction composite photocatalytic material, the material has good photoelectrochemical properties, and can meet the requirements of efficient photoelectric conversion, wide spectral response, long cycle life and the like.

The invention relates to low-iron glass for solar thermal power generation and a preparation method of the low-iron glass. Comprising the following steps: uniformly mixing 58.5 to 60 parts by weight of low-iron quartz sand, 12 to 15 parts by weight of low-iron dolomite, 3.5 to 6 parts by weight of low-iron limestone, 18.5 to 20 parts by weight of sodium carbonate, 1.7 to 2.1 parts by weight of potassium metaaluminate, 0.55 to 1.15 parts by weight of kainite, 0.25 to 0.5 part by weight of potassium bismuthate and 0.06 to 0.14 part by weight of cerium oxide to obtain a mixture; the mixture is put into a kiln to be melted, the melting temperature is set in a gradient mode, the oxidizing atmosphere is kept, and molten glass is obtained; clarifying, homogenizing, cooling, forming, annealing and cutting the molten glass to obtain the low-iron glass for solar thermal power generation. The low-iron glass for solar thermal power generation has higher sunlight direct transmittance and lower bubble defect number.

The invention relates to a porous copper bismuthate electrode material and a preparation method and application thereof, and belongs to the technical field of capacitive deionization desalination. The invention aims to solve the technical problems that the ion adsorption capacity and the electrochemical stability of a carbon-based electrode material are still limited, and the requirement for efficient and stable desalination in practical application is difficult to meet. The preparation method of the porous copper bismuthate electrode material comprises the following steps: adding a complexing agent into a mixed solution of a bismuth source and a copper source, then adding pretreated cordierite powder, and fully stirring under magnetic stirring to enable the cordierite powder to be uniformly dispersed in the solution to obtain a precursor mixed solution; and carrying out hydrothermal reaction on the precursor mixed solution, cooling after the reaction is finished, carrying out centrifugal separation, washing and drying to obtain the porous copper bismuthate electrode material. The porous copper bismuthate (CuBi2O4) electrode material is prepared by taking cordierite as a template and is applied to desalination in a capacitive deionization technology, so that the desalination efficiency is remarkably improved.

The application belongs to the technical field of photoelectric catalytic material preparation, and specifically provides a copper bismuthate / copper oxide conformal morphology heterojunction film and a preparation method thereof. The preparation method comprises the following steps: preparing a bismuth oxyiodide film, placing the bismuth oxyiodide film in a copper source solution, depositing for a certain time, sintering to obtain a pure-phase copper bismuthate film; preparing a copper nanocrystal solution through laser beam irradiation, dissolving thiourea molecules in the copper nanocrystal solution to obtain a mixed solution; spin-coating the mixed solution on the outer surface of the pure-phase copper bismuthate film, placing the pure-phase copper bismuthate film on a hot table for drying, placing the pure-phase copper bismuthate film in the copper source solution, depositing for a certain time again, sintering again to obtain a copper oxide second phase attached to the outer surface of the pure-phase copper bismuthate film, and obtaining the copper bismuthate / copper oxide conformal morphology heterojunction film. The pure-phase copper bismuthate film and the copper oxide second phase are obtained through two-time electrodeposition in sequence, the preparation process is simple and easy to control, and the surface dynamics and the surface carrier extraction efficiency of the prepared film are greatly improved.

The application belongs to the technical field of semiconductor photoelectrocatalytic functional materials, and particularly relates to a copper bismuthate-based composite thin film electrode material, a preparation method and application thereof. The application adopts a spin-coating-annealing-calcination process to construct a copper bismuthate thin film layer on a conductive substrate, and realizes the sequential loading of cadmium sulfide, noble metal or oxide thereof on the copper bismuthate thin film layer through chemical bath deposition and impregnation and calcination. The copper bismuthate thin film layer and the cadmium sulfide layer form a p-n heterojunction structure, and an electrocatalytic layer of noble metal is introduced on the surface of the p-n heterojunction, so as to enhance the interface charge transport process and improve the surface reaction kinetics. The copper bismuthate-based composite thin film electrode material not only has a simple preparation process, but also has high photoelectrocatalytic activity and cycle stability, so as to realize the efficient degradation of organic pollutants and has high application prospect.

This invention relates to the field of photocatalysis technology and provides a method for preparing a copper-cuprous oxide-copper bismuthate ternary complex. Sodium bismuthate dihydrate, copper sulfate, and sodium sulfite are added to a hydrothermal reactor containing distilled water to obtain a solid-liquid mixture. Under hydrothermal conditions, the solid-liquid mixture undergoes a synergistic reaction between sodium bismuthate and sodium sulfite solutions in a heterogeneous interface in-situ redox reaction and between copper sulfate and sodium sulfite solutions in a homogeneous redox reaction to generate the copper-cuprous oxide-copper bismuthate ternary complex. The advantages of this invention are: a one-pot method for preparing elemental copper-cuprous oxide-copper bismuthate ternary complex through a synergistic combination of heterogeneous interface in-situ redox reaction and homogeneous redox reaction; and the preparation steps are simple, convenient, and easily quantitatively controlled.

The invention belongs to the technical field of extraction, and specifically relates to a method for preparing cesium iodide from rubidium-cesium enriched material. The method comprises the following steps: S1: high-temperature roasting; S2: dissolving the roasting residue in deionized water and filtering to obtain solution A and filter residue; S3: adding acid to solution A to adjust the pH of solution A to acidic, and at the same time, adding iodide ions to obtain yellow solution B; S4: weighing bismuth oxide and dissolving it in hydrochloric acid to obtain solution C; S5: adding the yellow solution B to solution C to obtain a red solid precipitate D containing cesium and a rubidium-containing solution E; S6: solid-liquid separation; and S7: thermal decomposition treatment. The invention uses bismuth ions and iodide ions as precipitants, adds bismuth ions and iodide ions to a solution containing rubidium-cesium potassium, and reacts to generate precipitated cesium iodide bismuthate, thereby achieving almost selective recovery of cesium in the rubidium-cesium potassium solution. In addition, cesium iodide with a purity greater than 99% can be directly obtained by thermal decomposition of the cesium iodide bismuthate, and the bismuth iodide can be recovered to further prepare the precipitant.

The invention discloses a YSZ ceramic and aluminum-silicon alloy low-temperature connection glass soldering paste and a connection method, the low-temperature connection glass soldering paste is prepared by mixing bismuthate glass powder and an organic carrier, and the mass ratio of the bismuthate glass powder to the organic carrier is (6-8): 1; wherein the bismuthate glass powder is prepared from the following raw materials in percentage by mass: 75 to 80 percent of Bi2O3, 10 to 15 percent of B2O3, 6 to 8 percent of SiO2 and 2 to 4 percent of CuO. Compared with the prior art, the bismuthate glass powder has excellent thermal stability and lower crystallization tendency during heating, so that the residual stress of a weld joint is reduced, the joint strength is improved, and the low-temperature connection process is simple, does not need metallization pretreatment, and is low in welding temperature, low in cost and environmentally friendly.

This invention discloses a nano-heterojunction radiosensitizer suitable for hypoxic tumors and its preparation method. The radiosensitizer is a core-shell structured nanoparticle, comprising a core and a shell. The core is a high-valence bismuth-based nanomaterial, including at least one of sodium bismuthate, silver bismuthate, and potassium bismuthate. The shell coats the surface of the core and comprises a metal oxide. A Z-shaped heterojunction is formed between the inner core and the outer shell. Under X-ray excitation, this heterojunction forms a built-in electric field, promoting electron-hole separation. Electrons in the high-valence bismuth nanoparticle phase reduce high-valence bismuth (Bi). 5+ →Bi 3+ ) and releases highly reactive lattice oxygen, which then reacts with holes on the TiO2 phase to generate singlet oxygen ( 1 O2), while the holes on TiO2 oxidize water molecules to produce hydroxyl radicals (•OH).