322 results about "Boron oxide" patented technology

A vacuum insulating panel includes first and second substrates (e.g., glass substrates), a hermetic edge seal, a pump-out port, and spacers sandwiched between at least the two substrates. The gap between the substrates may be at a pressure less than atmospheric pressure to provide insulating properties. The vacuum insulating panel may include a multi-layer edge seal structure, including at least one layer including boron oxide (e.g., B2O3 or any other stoichiometry).

The invention provides base metal conductive paste for a photovoltaic cell and a preparation method, a use method and application thereof, and the conductive paste comprises the following components in percentage by mass: 5-60wt% of oxide coated base metal powder, 27-77wt% of silver powder, 2-5wt% of glass powder, 0.1-3wt% of an antioxidant aid and the balance of an organic carrier; wherein the base metal powder comprises one or more of copper, tungsten, tin, nickel, aluminum and alloy powder of the copper, the tungsten, the tin, the nickel, the aluminum and the alloy powder of the aluminum, and the oxide comprises one or more of silicon oxide, aluminum oxide, titanium oxide and boric oxide. The base metal powder coated with a specific type and a proper amount of oxide is selected and matched with the oxide and the glass powder which are good in compatibility, the manufacturing cost of the conductive paste and the battery can be effectively reduced, meanwhile, the conductive paste is applied to TOPCon and BC batteries, and the battery conversion efficiency can be kept equivalent to or even superior to that of traditional pure silver conductive paste.

The invention belongs to the technical field of glass, and particularly relates to high-light-transmittance glass and a preparation method of the high-light-transmittance glass. The raw materials comprise the following components in parts by weight: 20 to 30 parts of quartz sand, 15 to 18 parts of sodium carbonate, 8 to 10 parts of limestone, 5 to 7 parts of dolomite, 0.3 to 0.5 part of a clarifying agent, 0.2 to 0.3 part of a coloring inhibitor, 0.1 to 0.2 part of lithium carbonate, 0.05 to 0.1 part of titanium dioxide, 0.1 to 0.3 part of zirconium oxide, 2 to 4 parts of aluminum oxide, 1 to 3 parts of boron oxide, 0.3 to 0.5 part of nano silicon dioxide sol and 1 to 3 parts of a high-temperature-resistant agent; and 1-5 parts of a wear-resistant agent. The quartz sand, the sodium carbonate, the limestone, the dolomite, the clarifying agent, the coloring inhibitor, the lithium carbonate, the titanium dioxide, the zirconium oxide, the aluminum oxide, the boric oxide, the nano silicon dioxide sol, the high-temperature-resistant agent and the wear-resistant agent are used as raw materials, so that the prepared glass is high in light transmittance, and meanwhile, the performance requirements of high strength, low spontaneous explosion rate and the like are met.

The invention provides a thermal response self-ceramization fireproof coating and a preparation method thereof. The thermal response self-ceramization fireproof coating is prepared from the following raw materials in parts by mass: 3 to 10 parts of acrylic monomer, 3 to 10 parts of organic sulfonate, 1 to 4 parts of silane coupling agent, 0.5 to 3 parts of silicate ester, 4 to 6 parts of ceramic precursor, 3 to 6 parts of fluxing agent and 0.05 to 0.4 part of initiator. The fluxing agent comprises a component A and a component B, the component A is one of boric oxide, zinc borate or low-melting-point glass powder, and the component B is one of phosphorus pentoxide and ammonium polyphosphate. The silane coupling agent can be copolymerized with an acrylic monomer to construct a C-C main chain, the C-C main chain and silicate ester are subjected to hydrolytic condensation to form a Si-O-Si three-dimensional network, a chemical cross-linked skeleton is formed, and the chemical cross-linked skeleton can generate silicon dioxide at high temperature to participate in a ceramization reaction; the ceramic precursor and silicate ester can form a strong physical cross-linking effect, so that the fireproof coating with a chemical and physical double-cross-linked network can be formed, and the fireproof coating has excellent mechanical property and machinability at normal temperature.

The invention discloses high magnetic induction oriented silicon steel and a production method. The high magnetic induction oriented silicon steel comprises the following components in percentage by weight: 0.032 to 0.065 percent of C, 2.58 to 4.02 percent of Si, 0.014 to 0.036 percent of Als, 0.021 to 0.043 percent of Mn, 0.0015 to 0.014 percent of Nb, 0.0015 to 0.0084 percent of B, 0.0037 to 0.0081 percent of N and 0.004 to 0.015 percent of S. A large amount of B element is added, a proper amount of BN and other congenital inhibitors can be provided, the situation that primary grains are too large is effectively avoided, meanwhile, boron oxide, boric acid and borate are added into the magnesium oxide additive, an acquired inhibitor can be generated with N, an AlN + BN double-inhibitor system is formed, and the stability of magnetic performance is guaranteed; and the temperature is kept at 910-1005 DEG C for 18-25 hours, so that B is fully diffused and forms a new BN inhibitor with N, and the stability of the magnetic performance is effectively improved.

The invention discloses high-strength high-temperature-resistant fireproof industrial glass and a preparation method thereof, and relates to the technical field of glass manufacturing. The industrial glass is prepared from the following raw materials: silicon dioxide, boric oxide, aluminum oxide, sodium oxide, potassium oxide, niobium phosphate, a composite reinforcing component and a clarifying agent, the composite reinforcing component is prepared from hafnium oxide, gadolinium oxide and zinc oxide; the clarifying agent is obtained by mixing cerium dioxide and tin oxide. The preparation method of the industrial glass comprises the following steps: preparing functional components, melting glass, forming a glass substrate, and preparing the industrial glass. The prepared industrial glass is high in strength, good in high-temperature stability and excellent in fireproof performance.

A method and an apparatus for conformal boron doping of a three-dimensional structure. The method comprises: removing an oxide layer from a surface of a silicon-based three-dimensional (3D) substrate; forming, after removing the oxide layer, a first group of stacked films on a surface of the silicon-based three-dimensional substrate; forming a second group of stacked films on a surface of the first group of stacked films away from the silicon-based 3D substrate; depositing an aluminum oxide passivation layer on a surface of the second group of stacked films away from the first group of stacked films; and boron-doping the silicon-based 3D substrate through laser annealing or rapid thermal annealing, where the laser annealing or the rapid thermal annealing drives boron dopants, which comprises boron oxide, into the silicon-based 3D substrate via an auxiliary layer.

The invention discloses a radiation refrigeration coating as well as a preparation method and application thereof, and relates to the technical field of material preparation. The preparation method comprises the following steps: sintering hexagonal boron nitride, and removing boron oxide to obtain modified boron nitride powder; the preparation method comprises the following steps: reacting supramolecular polysiloxane with methoxypolyethylene glycol to obtain hyperbranched polysiloxane; the modified boron nitride powder and hyperbranched polysiloxane are subjected to hydrolysis on boron nitride under the alkaline condition, and silane modified boron nitride is obtained; the silane modified boron nitride is added into a polyurethane coating matrix to form the radiation refrigeration coating. The silicon-oxygen modified group is introduced to the surface of the boron nitride, so that the interaction between the boron nitride and the coating group is greatly improved, and the stability of the coating is improved; the coating can be cured under different environmental conditions, and construction on power equipment is facilitated; the formed radiation refrigeration coating is high in sunlight reflectivity, high in mid-infrared emissivity and high in heat dissipation capacity for power equipment.

The invention relates to the technical field of refractory materials, in particular to an antioxidant and application thereof in steel ladle slag line bricks, and the antioxidant comprises a Si / SiC multiphase material, modified nano Al2O3 and CaF2; the ladle slag line brick comprises an antioxidant, fused magnesite, crystalline flake graphite and phenolic resin. Si-SiC compound waste is subjected to magnetic separation and acid pickling, then a SiO2 passivation layer is formed through pre-oxidation, moisture and air in the storage period are isolated, and a titanate coupling agent is introduced to improve the wettability and compatibility with phenolic resin. P2O5 released by phosphate on the surface of the modified nano Al2O3 at a high temperature reacts with alkali (earth) metal migrated to a SiO2 oxide layer to prevent the alkali (earth) metal from forming a low-melting-point eutectic substance, CaF2 reacts with SiO2 along with temperature rise, a passivation layer is broken, internal Si and SiC are directly exposed, and boron oxide of the modified nano Al2O3 remarkably reduces activation energy and a temperature threshold value of the reaction of CaF2 and SiO2.

The invention relates to the technical field of preparation of high-purity boron oxide, and discloses a purification method of high-purity boron oxide and a device thereof, and the purification method comprises the following steps: step 1, mixing crude boron oxide with a liquid metal alloy, and dissolving metal impurities through gradient temperature control; 2, applying ultrasonic treatment to the mixed system, introducing a vortex field, and stripping impurities on the surface of the boron oxide; 3, a liquid metal phase and a boron oxide solid phase are separated through cooperation of a magnetic field and a pulse high-voltage electrostatic field; 4, non-metal ion impurities are removed through a gradient porous ceramic adsorption bed; and step 5, melting boron oxide in vacuum and carrying out gradient cooling crystallization. By adopting the technical scheme of a Ga-I n-Bi-Er quaternary liquid alloy system, the technical effect of selective targeted removal of metal impurities is achieved, and compared with a liquid metal system depending on single phase solubility difference in the prior art, the defect that efficient chelating and dynamic settling separation of the impurities cannot be achieved at the same time is overcome.

The invention relates to the technical field of electronic glass fiber materials, and particularly discloses a corrosion-resistant low-dielectric glass fiber and a preparation process thereof. A preparation process of corrosion-resistant low-dielectric glass fibers comprises the following steps: S1, uniformly mixing glass fiber raw materials, melting, clarifying, homogenizing, cooling, and carrying out wiredrawing treatment to obtain glass fiber precursors; and S2, sequentially carrying out plasma treatment and impregnating compound treatment on the glass fiber precursor, drying and curing to obtain the corrosion-resistant low-dielectric glass fiber, silicon dioxide, aluminum oxide, magnesium oxide, boric oxide, calcium fluoride, tin oxide, sodium oxide, potassium oxide and rare earth oxide are used as glass fiber raw materials, and the rare earth oxide is a mixture of gadolinium oxide, cerium oxide and samarium oxide. The obtained glass fiber has excellent low dielectric property and corrosion resistance, and has a wide market prospect.

The invention belongs to the technical field of electrode material preparation, and particularly relates to a preparation method of boric acid-assisted low-temperature sintered porous aluminum foil. The preparation method comprises the following steps: dispersing aluminum powder, boric acid and binder raw materials in a solvent to form dispersed slurry; and coating a matrix with the dispersed slurry, drying, sintering at 450-600 DEG C under protective gas, reacting boric acid with aluminum oxide on the surface of the aluminum powder to form low-melting-point aluminoborate, reducing the sintering temperature, promoting aluminum atom diffusion, increasing sintering neck formation, and sintering to obtain the porous aluminum foil. Boron oxide generated by decomposition of boric acid is added to react with aluminum oxide to form low-melting-point aluminoborate, the sintering liquidus temperature is reduced, aluminum atom diffusion is promoted, and low-temperature sintering at 450-600 DEG C is achieved. The aluminum powder sintered foil is suitable for energy storage devices such as an aluminum electrolytic capacitor and a lithium ion battery, has the advantages of low-temperature energy conservation, high porosity and strong mechanical property, and solves the problems of aluminum oxide obstruction and high high-temperature energy consumption of the traditional aluminum powder sintered foil.

The application discloses a hydrodesulfurization catalyst and a preparation method and application thereof. The hydrodesulfurization catalyst comprises a carrier and a second active metal component; the carrier comprises a first active metal nitride, a first active metal carbide, boron oxide and aluminum oxide; wherein the molar ratio of the first active metal nitride to the first active metal carbide, in terms of the first active metal, is 1:0.15-0.25. The hydrodesulfurization catalyst has the characteristics of good macromolecular diffusion performance, strong desulfurization capacity and good carbon deposition resistance. The hydrodesulfurization catalyst is particularly suitable for a residual oil hydrodesulfurization treatment process and has good desulfurization activity and stability.

The invention relates to the technical field of modified carbon graphite materials, and particularly discloses an antioxidant modified carbon graphite material and a preparation method thereof, the antioxidant modified carbon graphite material comprises the following raw materials by weight: 30-34 parts of medium temperature pitch, 4-6 parts of modified silica sol and 10-12 parts of artificial graphite powder; from two aspects, firstly, the aluminum dihydrogen phosphate and the boric acid aqueous solution are added, the aluminum dihydrogen phosphate can promote the asphalt to form a denser and firmer glassy carbon structure during carbonization, and phosphorus pentoxide generated by decomposition of the aluminum dihydrogen phosphate and boron oxide generated by dehydration of boric acid can generate a glass phase with an anti-oxidation effect; secondly, core-shell particles are added, a shell layer of the core-shell structure is an aluminum hydroxide structure generated by hydrolyzing aluminum nitrate nonahydrate, and an inner core is epoxidized nano silicon carbide; through the synergistic effect of the two, the mechanical property and the oxidation resistance of the carbon-graphite material are improved.

The invention belongs to the technical field of glass materials, and particularly relates to black high-hardness heat-resistant microcrystalline glass ware and a preparation method thereof. Silicon dioxide, sodium oxide, aluminum oxide, potassium oxide, boric oxide, magnesium oxide, calcium oxide, zinc oxide, sodium fluosilicate, iron oxide, manganese oxide, fluorite, lithium oxide, metal manganese coated with silicon dioxide and schorlite are used as raw materials, and the black high-hardness heat-resistant microcrystalline glass ware is prepared through the processes of high-temperature melting and mixing, compression molding, annealing and tempering. The black high-hardness heat-resistant microcrystalline glass ware is excellent in performance, high in hardness and good in heat resistance, and has potential market value.

The invention relates to the technical field of environmental waste treatment, and discloses a preparation method of modified household garbage incineration fly ash, the modified household garbage incineration fly ash comprises the following components by mass: 90-99 parts of a fly ash matrix; 0.1 to 2 parts of a plasma activation layer; 0.5 to 8 parts of a silicon oxide coating layer; the preparation method comprises the following steps: pretreating the fly ash; performing plasma activation; preparing a mineralizing solution; performing biomimetic mineralization; and calcining at low temperature. The plasma activation layer is introduced, the silicon oxide coating layer is constructed, and the phosphorus oxide or the boron oxide is cooperatively introduced, so that the microstructure and the surface chemical property of the material are effectively optimized, the specific surface area and the pore volume of the material are increased, and a microporous, mesoporous and macropore synergistic multistage pore channel structure is constructed; the adsorption capacity and the adsorption rate of various waste gas pollutants are improved.

The invention provides a wear-resistant and anti-slip ceramic tile and a preparation method thereof, the wear-resistant and anti-slip ceramic tile has a matte transparent wear-resistant cover glaze layer and an anti-slip dry granular glaze layer sprayed on the matte transparent wear-resistant cover glaze layer in an electrostatic spraying manner, and the matte transparent wear-resistant cover glaze layer comprises the following raw materials in percentage by weight: 1-10% of a wear-resistant dry granular glaze layer; comprising 1-5 parts of burnt zinc oxide, 10-20 parts of potassium feldspar, 3-8 parts of calcite, 2-6 parts of superfine corundum powder, 30-45 parts of high-aluminum-calcium frit, 10-20 parts of high-barium frit, 5-10 parts of kaolin, 7-15 parts of superfine quartz powder, 3-8 parts of high-silicon-aluminum frit and 3-8 parts of boron frit. The glaze is high in transparency and does not affect color development of ink; a silica tetrahedron and a boron-oxygen tetrahedron which are stable in structure are formed on the glaze surface, so that the Mohs hardness of the ceramic tile is high, the wear-resistant grade is high, and the wear mass is small; anti-skid dry granular glaze is applied in an electrostatic spraying mode, flatness is high, cleaning is easy, dirt is not hidden, and dual wear resistance is achieved.

The invention provides high-purity superfine titanium diboride and a preparation method thereof, and relates to the field of titanium diboride preparation. The method comprises the following steps: mixing boron oxide, titanium hydride, a carbon source, nano rare earth oxide and an organic solvent, and drying to obtain a mixture; in a vacuum environment, performing first roasting on the mixture to obtain a first roasted material; and in an oxygen-containing atmosphere, carrying out second roasting on the first roasting material to obtain the high-purity superfine titanium diboride. In the first roasting process, boron oxide, titanium hydride and a carbon source are completely melted and fully contacted, then further, the carbon source forms a carbon skeleton, the contact area between the melted boron oxide and titanium hydride and the carbon skeleton is further enlarged, liquid-liquid mixing and the increase of the contact area can reduce the reaction kinetic conditions, the reaction temperature is greatly reduced, and the reaction time is greatly shortened. The particle size of the generated titanium diboride is reduced, and the molten boron oxide and titanium hydride react on the porous carbon skeleton in a liquid-liquid form to generate the high-purity superfine titanium diboride.

The invention relates to the technical field of casting powder, in particular to special casting powder for nib steel, which comprises the following raw materials: calcium oxide, silicon dioxide, aluminum oxide, boric oxide, modified magnesium oxide-zirconium oxide solid solution particles and yttrium-silicon nitrogen oxygen complex phase particles. Modified magnesium oxide-zirconium oxide solid solution particles are subjected to phenyltrimethoxysilane surface coupling treatment, so that the interfacial compatibility and dispersion stability with a casting powder matrix are greatly enhanced, the viscosity of the casting powder can be stabilized at high temperature, fluctuation can be reduced, heterogeneous nucleation points can be provided, and the casting powder can be used for preparing a high-temperature-resistant casting powder material. A slag film is promoted to form a fine and uniform crystal structure, so that the lubrication continuity is greatly improved, and casting blank friction and surface defects are reduced; the yttrium-silicon-nitrogen-oxygen complex phase particles have the characteristic of promoting crystallization of silicon nitride, the yttrium element enhances the high-temperature stability and slag corrosion resistance of the particles, the crystallization behavior of slag can be regulated and controlled more lastingly and effectively, and the strength of a lubricating film is higher and more uniform.

The invention provides a TOPCon battery and a preparation method thereof, and boron diffusion equipment, and the preparation method of the TOPCon battery comprises the steps: providing a silicon substrate, placing the silicon substrate in a boron diffusion furnace, introducing nitrogen into a furnace mouth region of the boron diffusion furnace, introducing oxygen and boron trichloride into the boron diffusion furnace, introducing nitrogen gas into the furnace mouth region of the boron diffusion furnace, introducing nitrogen gas into the furnace mouth region of the boron diffusion furnace, introducing nitrogen gas into the furnace mouth region of the boron diffusion furnace, and introducing nitrogen gas into the furnace mouth region of the boron diffusion furnace, the ratio of the flow of the oxygen to the flow of the boron trichloride is alpha, and alpha is more than or equal to 3.5 and less than or equal to 4.5. The nitrogen can quickly purge reaction byproducts in a low-temperature area of the furnace mouth, and sufficient oxygen is provided to completely oxidize boron trichloride into a gaseous boron oxide precursor before the boron trichloride enters a high-temperature reaction area, so that the generation of viscous low-temperature boron oxide due to insufficient oxidation is avoided; and the generation and deposition of boron oxide crystals at the furnace mouth are inhibited from two dimensions of mass transfer process and chemical reaction completeness, and the yield and average photoelectric conversion efficiency of the TOPCon battery can be remarkably improved.

The invention discloses a novel antibacterial environment-friendly ceramic and a preparation method thereof, and belongs to the technical field of ceramics, the method comprises the following steps: dissolving aluminum chloride, barium nitrate and ferric nitrate in a solvent, and stirring and mixing to prepare a first mixed solution; adding kaolin and carbon powder into the first mixed solution, and stirring and mixing to obtain a second mixed solution; boron, carbon, aluminum, boron oxide, zirconium dioxide and barium carbonate are dispersed in a dispersing agent to be mixed to prepare a third mixed solution; boron oxide, aluminum hydroxide, titanium boride, zirconium, silicon, sodium zirconate, sodium carbonate, calcium tungstate and zirconium dioxide are added into the second mixed solution to be stirred and mixed, and mixed slurry is prepared; the mixed slurry is used for preparing a blank body, the blank body is placed in a sintering furnace to be sintered in different temperature stages and sintering environments, and the prepared ceramic has high strength, is not prone to cracks in the environment where the temperature changes rapidly and is good in corrosion resistance.

This invention discloses a method for preparing high rare-earth-doped low-loss boron-containing glass optical fibers. The steps are as follows: weigh glass raw materials containing rare-earth oxides and boron oxide, mix them uniformly, and place them in a high-temperature furnace. First, heat the mixture under a high-purity nitrogen atmosphere, then switch to a high-purity oxygen atmosphere or a high-purity air atmosphere for continued heating. The resulting glass melt is cooled and annealed to obtain a large glass block. The glass is then processed into a preform and placed in an optical fiber drawing furnace for fiber drawing under a high-purity oxygen atmosphere, thus achieving the preparation of high rare-earth-doped low-loss glass optical fibers. This invention eliminates the additional glass matrix absorption in the near-infrared region caused by boron in boron-containing glass optical fibers and also transforms the transition metal impurity ions from a low valence state with broad absorption in the near-infrared region to a high valence state with narrow low absorption in the near-infrared region. Both of these aspects significantly reduce the matrix absorption of boron-containing glass optical fibers, providing possibilities for the application of high rare-earth-doped low-loss glass optical fibers.

The invention relates to the technical field of ceramic substrates, and provides a multilayer ceramic substrate metallization method, which comprises the following steps: S1, cleaning and drying a ceramic substrate to obtain a treated ceramic substrate; s2, printing the printing slurry on the treated ceramic substrate, and carrying out drying, lamination, pressing and sintering to obtain a metalized multilayer ceramic substrate; the printing paste comprises the following components in parts by weight: 80 parts of conductive powder, 4-8 parts of zinc oxide, 8-12 parts of boric oxide, 3-5 parts of bismuth oxide, 5-10 parts of titanium-doped aluminum oxide, 4-8 parts of guar gum, 1-2 parts of hydrogenated castor oil and 15-20 parts of a solvent; the titanium-doped aluminum oxide comprises the following raw materials: aluminum oxide and water-soluble titanium salt in a weight ratio of 18: (2-7). According to the technical scheme, the problem that the heat-conducting property of the ceramic substrate is poor when the glass powder is added in the prior art is solved.

The present invention discloses a method for preparing a boron nitride fiber felt, comprising the following steps: Step 1: adding boron nitride fiber, a thickener, a dispersant, and a defoaming agent to water, mixing, dehydrating, and drying to form a first preform; Step 2: fully impregnating the first preform with a boron oxide solution, and then drying again to form a second preform; Step 3: heating the second preform to melt the boron oxide, thereby forming a boron oxide-bonded boron nitride fiber felt; Step 4: heat-treating the boron oxide-bonded boron nitride fiber felt under an ammonia and nitrogen atmosphere to obtain a boron nitride fiber felt. The present invention also discloses a boron nitride fiber felt. The boron nitride fiber felt prepared by the present invention has the characteristics of high temperature resistance, corrosion resistance, low dielectric constant, and low thermal conductivity. It can be used as a diaphragm for making thermal batteries, thermal insulation treatment for high-temperature equipment, and can also be used for alloy reinforcement and high-temperature filter materials. The composite material made from it has good wave transmission performance and is an ideal material for aerospace.

The application provides an antibacterial ceramic tile preparation method and antibacterial ceramic tile, and the method comprises the following steps: preparing ceramic powder, wherein the ceramic powder comprises the following components: high-sodium feldspar 9-16%, calcined talc 3-8%, corundum powder 5-12%, silicon powder 2-6%, boron oxide 2-6%, calcined clay 0-4%, and ceramic glaze powder 30-80%; applying a specific underglaze to form an underglaze base layer, wherein the specific underglaze is obtained by adding the ceramic powder into the underglaze; forming a pattern decoration layer on the surface of the underglaze base layer, applying dry particles to form a dry particle layer, drying the dry particle layer, applying a specific hot melt plastic sealing glaze, putting into a kiln to be fired, and obtaining the antibacterial ceramic tile, wherein the specific hot melt plastic sealing glaze is obtained by adding the ceramic powder into the hot melt plastic sealing glaze. According to the application, the ceramic powder capable of generating far infrared waves is added into the underglaze and the specific hot melt plastic sealing glaze, so that the stability and durability of the product performance are not affected even if the face glaze is abraded, and the stable and efficient antibacterial performance can be maintained.

This invention relates to a glass cover with an outer frame, wherein a flat glass plate is directly joined to the outer frame, wherein the glass matrix within the outer frame comprises at least one of bismuth oxide and boron oxide, and the glass ceramic has a coefficient of thermal expansion of 15 × 10⁻⁶. －7 In the glass ceramics described above, the total volume fraction of the negative thermal expansion filler and the total volume fraction of the filler components are both 40% to 65%, and the softening point of the glass components in the glass matrix is ​​lower than the glass transition point of the flat glass.

The invention belongs to the technical field of organic luminescent materials and semiconductors, and provides a seven-membered ring boron oxide compound, a preparation method thereof and an electroluminescent device. The structural formula of the seven-membered ring boron oxide compound is as shown in formula (1): # imgabs0 #, the electroluminescent device is prepared by taking the seven-membered ring boron oxide compound as a guest luminescent material, and the technical problem of low luminous efficiency of the existing compound containing a boron oxide structure as a luminescent material is solved.

The present application belongs to the technical field of steel metallurgy continuous casting, and particularly relates to a crystallizer non-lithium protecting slag for stainless steel slab continuous casting and application. The non-lithium protecting slag is composed of the following components: calcium oxide 28-40%, silicon oxide 26-38%, aluminum oxide 2-8%, sodium oxide 9-14%, fluoride ion 5-11%, magnesium oxide 1-4%, boron oxide 1-5%, manganese oxide 0.5-3%, total carbon 2-4.5%, and the rest is inevitable impurities and carbonate volatiles; the mass ratio of sodium oxide / magnesium oxide is greater than or equal to 3.5. The hollow particle type protecting slag product designed in the present application can reduce the ton slag cost by 1000-2500 yuan, and has the performance of the conventional lithium-containing austenitic stainless steel slab continuous casting protecting slag, and is beneficial to the smooth running of the austenitic stainless steel high-pulling speed continuous casting process, and reduces the raw material procurement cost of the steel enterprise, so that the market competitiveness of the stainless steel product can be further enhanced.

The invention discloses a preparation method of silver-coated copper slurry suitable for TOPCON, and relates to the technical field of battery preparation, and the preparation method comprises the following steps: preparing silver-coated copper particles; silver-coated copper particles are mixed with a glass system, an organic system and nanoscale silver particles according to the mass ratio to prepare silver-coated copper slurry; the silver-coated copper particles sequentially comprise a copper core, an aluminum oxide protection layer, a nickel layer and a nano-silver coating layer from inside to outside, and the silver-coated copper slurry is formed by mixing the silver-coated copper particles, a glass system, an organic system and nano-scale silver particles according to a mass ratio. The glass system is composed of bismuth oxide-boric oxide composite glass, zinc oxide-silicon oxide composite glass and tellurium oxide glass. According to the invention, the silver-coated copper particles with a multi-layer coating structure are used as a main conductive phase and are combined with the nano-silver particles, so that the conductive performance is ensured, the raw material cost of the paste is reduced, the cost pressure is dealt with, the problems of copper core oxidation and ion migration are solved, and the paste can be kept stable in a high-temperature and high-humidity environment.

This invention relates to the field of glass-ceramic technology, specifically providing a low-temperature co-fired ceramic, its preparation method, and its application. The raw materials for the low-temperature co-fired ceramic include VSBBS glass frit and ceramic frit, with the total weight of the VSBBS glass frit and ceramic frit being 100%. The mass percentages of the VSBBS glass frit and ceramic frit are 20-40% and 60-80%, respectively. The raw materials for the VSBBS glass frit, by mass percentage, include 10-30 wt% vanadium oxide, 10-30 wt% antimony oxide, 10-30 wt% barium oxide, 10-20 wt% boron oxide, and 30-50 wt% silicon oxide, with the sum of all oxides being 100%. The LTCC material obtained by this invention achieves excellent millimeter-wave dielectric properties, with a relative permittivity between 4.8 and 6.8, a dielectric loss less than or equal to 0.001, and a flexural strength of 180-230 MPa.