25 results about "Barium oxide" patented technology

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.

This application discloses a method for producing acetonitrile by amination of acetate, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and alkaline earth metal oxides and alkali metal oxides supported on the surface of the support; wherein the support is selected from at least one of silicon oxide, aluminum oxide, titanium oxide, and zirconium oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; wherein the loading of alkaline earth metal oxide in the catalyst is 0.01–10 wt%, the loading of alkali metal oxide is 0.05–5 wt%, and the remainder is the support.

This invention provides an electronic-grade glass fiber composition and its glass fiber cloth, relating to the field of glass fiber technology. The electronic-grade glass fiber composition comprises: alumina, silicon oxide, magnesium oxide, calcium oxide, barium oxide, additives, and fillers; the mass ratio of alumina, barium oxide, and additives is (20-40):(2-8):(2-5); the additives are metal A and metal B in a mass ratio of (1-5):(1-5); metal A includes at least one selected from titanium, vanadium, chromium, manganese, iron, cobalt, and nickel. Metal B includes at least one selected from lanthanum, cerium, praseodymium, scandium, and yttrium. The electronic glass fiber cloth prepared from the electronic-grade glass fiber composition of this invention has high tensile strength and low moisture regain during long-term storage.

The application discloses a method for catalytic oxidative cleavage of aromatic ether substances. The method is that aromatic ether substances, metal-base composite catalysts and water medium are placed in an autoclave, and oxygen-containing gas is filled for hydrothermal reaction; the metal-base composite catalysts contain metal active components and base active components, wherein the metal active components are ruthenium, palladium, platinum, copper or cobalt, and the base active components are magnesium oxide, barium oxide or calcium oxide; the method can catalytically oxidize and cleave the aromatic ether substances into high-value-added small organic molecules such as phenols and carboxylic acids with high selectivity, and does not need to use organic solvent medium and add a large amount of inorganic base, and has the characteristics of simple process, high product added value and the like, and can produce important economic value and social benefits.

We provide phosphate glass with a high refractive index and low density. [Solution] The glass composition contains phosphorus oxide (P2O5), niobia (Nb2O5), barium oxide (BaO), and potassium oxide (K2O) as essential components, and may optionally contain titania (TiO2), calcium oxide (CaO), sodium oxide (Na2O), lithium oxide (Li2O), bismuth oxide (Bi2O3), strontium oxide (SrO), tungsten oxide (WO3), and other components, with the total of TiO2 + Nb2O5 being 1.0 mol% or more and 55.0 mol% or less. The glass can be characterized by a high refractive index at 587.56 nm at relatively low density at room temperature.

This invention belongs to the field of catalytic materials technology, specifically relating to a monodisperse nanoscale BaO-supported MWW molecular sieve catalyst, its preparation method, and its application. The catalyst uses MWW molecular sieve as a support, dispersing and loading BaO nanoparticles. 90-95% of the BaO nanoparticles are monodisperse nano-barium oxide, with an average size in the nanometer range, and at least 90% are dispersed on the outer surface of the molecular sieve. At least 80% of the crystals in the support possessing the MWW topology are 2.5-20 nanometer layered nanosheets. The total specific surface area of ​​the catalyst is 300-500 m². 2 / g, with the external specific surface area accounting for no less than 30% of the total specific surface area. Compared with the prior art, this invention solves the problems of easy agglomeration and poor accessibility of active sites of BaO catalysts. This scheme achieves uniform dispersion of BaO particles at the nanoscale on the outer surface of molecular sieves, thereby exhibiting excellent catalytic activity and selectivity in PET saccharification reaction.

The glass composition includes phosphorus oxide (P2O5), niobium oxide (Nb2O5), barium oxide (BaO), and potassium oxide (K2O) as essential components, and can optionally include titanium oxide (TiO2), calcium oxide (CaO), sodium oxide (Na2O), lithium oxide (Li2O), bismuth oxide (Bi2O3), strontium oxide (SrO), tungsten oxide (WO3), and other components. The glass can be characterized as having a high refractive index at 587.56 nm with a comparable room temperature low density.

This application discloses a method for producing acetonitrile, comprising the following steps: in a reactor, contacting an acetate, ammonia, and a catalyst to react and obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; wherein the catalyst is composed of a support and a divalent transition metal oxide, an alkaline earth metal oxide, and an alkali metal oxide supported on the surface of the support; wherein the divalent transition metal oxide is selected from at least one of manganese oxide, ferrous oxide, cobalt oxide, nickel oxide, copper oxide, and zinc oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; and wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide.

The present application belongs to the technical field of glaze, and particularly relates to FeNiCrAl-based multi-main-element alloy transparent glaze glaze and glazing process thereof. The glaze contains inorganic oxide, hollow glass microspheres, barium oxide and sodium silicate aqueous solution. The glazing process comprises the following steps: uniformly mixing the inorganic oxide, hollow glass microspheres, barium oxide and sodium silicate aqueous solution to prepare the glaze; uniformly coating the glaze on the surface of the heated FeNiCrAl-based multi-main-element alloy; drying and solidifying; and firing the alloy at 1000-1300 DEG C. The glaze of the present application has the advantages of simple manufacturing process, simple glazing process steps, high operability, strong adhesion between the glaze layer and the alloy, and the ability to solve the problem of explosion and falling of the glaze layer on the surface of the multi-main-element alloy due to the difference between the two phases, and has the advantages of corrosion resistance, water resistance, chemical resistance and wear resistance.

The application discloses a double-layer coated soft magnetic composite material, which comprises a soft magnetic powder, and the surface of the soft magnetic powder is sequentially coated with an inorganic insulating layer and an organic insulating layer; raw materials of the inorganic insulating layer comprise an inorganic powder, a silane coupling agent and a dispersing agent; raw materials of the organic insulating layer comprise a thermosetting resin and a curing agent; the soft magnetic powder is one of a cobalt-based soft magnetic powder, a zirconium-based soft magnetic powder, an iron-based soft magnetic powder and a nickel-based soft magnetic powder; and the inorganic powder comprises one or a combination of several of calcium oxide, barium oxide, beryllium oxide, zirconium oxide, tungsten carbide, carbonate and silicate. The application further discloses a preparation method of the double-layer coated soft magnetic composite material. The obtained double-layer coated soft magnetic composite material not only has high magnetic permeability and resistivity, but also has excellent high-temperature resistance, high-pressure resistance, corrosion resistance and loss resistance.

The present application relates to calcium-containing high refractive phosphate glasses. The glass composition contains phosphorous oxide (P2O5), niobium oxide (Nb2O5), titanium oxide (TiO2), potassium oxide (K2O), and calcium oxide (CaO) as essential components, and can optionally contain barium oxide (BaO), sodium oxide (Na2O), lithium oxide (Li2O), tungsten oxide (WO3), bismuth oxide (Bi2O3), tantalum oxide (Ta2O5), silicon oxide (SiO2), and other components. The glass can be characterized as having a high refractive index at 587.56 nm with a comparable room temperature low density.

This application discloses a composite metal oxide catalyst, its preparation method, and its application. The composite metal oxide catalyst comprises a support and metal oxides supported on the surface of the support; the metal oxides include metal oxide I, metal oxide II, and metal oxide III; metal oxide I is selected from at least one of manganese oxide, ferrous oxide, cobalt oxide, nickel oxide, copper oxide, and zinc oxide; metal oxide II is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; metal oxide III is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; the loading amount of metal oxide I is 0.1–20 wt%, the loading amount of metal oxide II is 0.01–5 wt%, the loading amount of metal oxide III is 0.01–5 wt%, and the remainder is the support.

This invention belongs to the technical field of electrical inorganic materials, specifically relating to a high-whiteness, high-voltage resistant insulator ceramic material and its preparation process. The ceramic material, by mass, consists of a basic component, a structure-regulating component, and an auxiliary phase component. Zirconia and niobium pentoxide are introduced to construct a composite regulation system, and various components such as talc, barium oxide, and magnesium oxide are combined to form a multiphase compatibility structure. The auxiliary phase uses rare earth oxides and borate fluxes to adjust the phase composition and stability. The preparation method includes steps such as raw material mixing, pressure filtration and mud refining, molding, drying and bisque firing, glazing, and high-temperature firing. A composite oxide glaze system is used for glaze construction. This invention features strong formulation synergy and precise structure regulation in its material composition and sintering process, making it suitable for the preparation of high-performance insulator ceramic products.

This invention provides a cast low-silicon, low-sodium AZS brick, characterized by comprising the following raw materials: alumina, zirconium dioxide, silicon dioxide, chromium oxide, niobium pentoxide, magnesium oxide, barium oxide, and soda ash; wherein the mass ratio of niobium pentoxide to chromium oxide is 2-4:1. The cast low-silicon, low-sodium AZS brick of this invention, by introducing barium oxide, magnesium oxide, and sodium oxide into its composition system, and introducing niobium pentoxide and chromium oxide into the glass phase, reduces the glass phase content, increases corrosion resistance, reduces the amount of glass phase exudation, and extends the service life of the product in glass furnaces.

This invention belongs to the field of catalysis technology, and specifically discloses a cobalt-based catalyst and its preparation method. The cobalt-based catalyst is composed of 30%–92% metallic cobalt, 3%–48% barium oxide, and 5%–40% metallic lead and / or 1%–26% metallic silver, uniformly mixed in particulate form, all by mass percentage; wherein the particle size does not exceed 30 nm. The cobalt-based catalyst of this invention is prepared by precipitation, followed by drying, heat treatment, and reduction. This preparation method, through control of component content and by combining components to promote thorough mixing and avoid premature precipitation, ensures excellent dispersibility and extremely small particle size control of the final product. The process is simple, uses inexpensive raw materials, and is applicable to conventional catalyst industrial production equipment. The cobalt-based catalyst prepared by this method is easy to mold, has high mechanical strength, and high catalytic activity, showing strong industrial application prospects. This invention also discloses the application of the above-mentioned cobalt-based catalyst in ammonia synthesis reactions.

Glass compositions include titania (TiO2), lanthanum oxide (La2O3), boron oxide (B2O3), silica (SiO2) as essential components and may optionally include zirconia (ZrO2), niobia (Nb2O5), calcium oxide (CaO), barium oxide (BaO), yttria (Y2O3), zinc oxide (ZnO), gadolinium oxide (Gd2O3), gallia (Ga2O3), tungsten oxide (WO3) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.

The present application relates to the field of electronic ceramics and additive manufacturing technology, and particularly relates to a barium modified sodium borosilicate LTCC substrate and a photocuring 3D printing preparation method thereof. The method comprises the following steps: mixing sodium carbonate, boric acid and silicon dioxide to obtain sodium borosilicate glass powder through melting, water quenching and ball milling; mixing the glass powder, ceramic filler, photosensitive resin and barium carbonate to obtain photocuring slurry; forming ceramic green body through photocuring 3D printing; and obtaining the LTCC substrate through debinding and sintering in air atmosphere. The addition amount of barium carbonate satisfies that the theoretical mass of barium oxide generated by decomposition during debinding and sintering accounts for 2% of the total mass of the glass powder and the ceramic filler. By introducing barium carbonate and controlling the addition amount, the present application utilizes the synergistic effect of the thermal decomposition characteristics of barium carbonate and the liquid phase sintering behavior of sodium borosilicate glass, effectively heals the degassing pore, and inhibits the high-frequency polarization loss of alkali metal ions, so that the LTCC substrate has high density and wide frequency and low dielectric loss, and is suitable for high-frequency communication device packaging.

The invention is a method for removing carbon dioxide gas from ambient air using water and solid barium hydroxide in a reaction vessel. Incoming and outgoing water is supplied by freshwater and wastewater treatment plants through underground piping. The reaction vessel has an upper part and a jacket, which is heated by hydrogen gas. The vessel has a series of discharge ports on the upper part, and a conversion facility is located in an area of high greenhouse gas concentration. The barium hydroxide reacts with carbon dioxide to produce barium carbonate, which is sold along with the discharge water to generate revenue. The method provides a promising solution for mitigating the effects of climate change by reducing carbon emissions from the atmosphere.

An enamel composition, a method for preparing an enamel composition, and a cooking appliance are provided. The enamel composition may include 15 to 50 wt % of phosphorus pentoxide (P2O5); 5 to 20 wt % of one or more of lithium oxide (Li2O), sodium oxide (Na2O), or potassium oxide (K2O); 1 to 5 wt % of one or more of sodium fluoride (NaF), calcium fluoride (CaF2), or aluminum fluoride (AlF3); 1 to 35 wt % of one or more of magnesium oxide (MgO), barium oxide (BaO), or calcium oxide (CaO); and 5 to 30 wt % of one or more of manganese dioxide (MnO2), molybdenum trioxide (MoO3), bismuth oxide (Bi2O3), or nickel oxide (NiO). The enamel composition may be cleaned without being putting it into water.

This invention relates to a refining method for reducing the aluminum content in aluminum-deoxidized rare earth steel, belonging to the field of iron and steel metallurgical technology. It solves the technical problem of high risk of nozzle blockage during continuous casting when using aluminum deoxidation in existing rare earth steel refining processes. The refining method for reducing the aluminum content in aluminum-deoxidized rare earth steel includes the following steps: Step S1: When tapping from the converter, aluminum and low-silicon barium ferroalloy are added to the molten steel for deoxidation, and lime, magnesia-containing, and alumina-containing slag are added to the slag surface; Step S2: When entering the LF ladle furnace, lime, barium oxide-containing, magnesia-containing, and sodium oxide-containing slag are added to the slag surface to create white slag; aluminum particles and low-silicon barium ferroalloy are added simultaneously for deoxidation, and alloying is performed during the middle stage of white slag formation; after white slag formation, soft blowing treatment is performed; Step S3: During RH vacuum degassing refining, no alloy is added, and rare earth ferroalloy is added at the end of the vacuum treatment, and soft blowing is performed when exiting the RH furnace. This invention achieves the purpose of suppressing nozzle turbulence and reduces the frequency of nozzle replacement.

A method for producing lithium iron phosphate from waste lithium iron phosphate material is provided. [Solution] The method includes the steps of: crushing the positive electrode sheet of a waste lithium iron phosphate battery, sieving it to obtain lithium iron phosphate raw material, dissolving it in an acidic solution, and collecting the first filtrate after filtration; adding ferrous sulfate solution to the first filtrate to obtain a mixed solution; adding hydrogen peroxide solution and ammonia aqueous solution to the mixed solution, filtering and washing after the reaction to obtain a second filtrate and a filtration cake; washing and drying the filtration cake to obtain iron hydroxyphosphate; adding barium hydroxide aqueous solution to the second filtrate, allowing it to react completely and then filtering to obtain a third filtrate; adding phosphoric acid solution to the third filtrate to obtain a fourth filtrate; mixing iron hydroxyphosphate, the fourth filtrate and a carbon source, sanding the slurry, drying and obtaining a powder; and sintering and pulverizing the powder in an inert atmosphere to obtain a carbon-coated lithium iron phosphate material.