8 results about "Bismuthate" patented technology

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 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.

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).