99 results about "Barium" patented technology

The invention discloses a simple preparation method of a barium-based metal organic framework (Ba-H2Sip) and proton conduction application of the barium-based metal organic framework (Ba-H2Sip), belongs to the field of functional material synthesis and energy application, and is characterized in that functional differentiation design of a 5-sulfoisophthalic acid ligand: a sulfonic group forms a two-dimensional layered structure by chelating Ba < 2 + >; the carboxyl groups are differentiated into'anchoring carboxyl groups' for constructing a three-dimensional supramolecular skeleton and'proton supply carboxyl groups' for providing a proton source, and the design is reported for the first time in Ba-based MOFs; according to the present invention, the large-scale preparation can be achieved by stirring the low-cost raw material in 1 mol / L hydrochloric acid at the room temperature, the yield exceeds 70%, the product can resist 8 M acid and pH = 13 alkali liquid, the conductivity at 90 DEG C / 90% humidity can achieve 1.39 * 10 <-2 > Scm <-1 >, the high-temperature process is not required, the raw material is low in cost and easy to obtain, and the feasible scheme is provided for the high-efficiency proton conductor industrialization.

A process for producing amines by reductive amination, the process includes introducing a feed stream, the feed stream comprising an amino alcohol and a reducing agent, and hydrogen in a reaction zone of a reactor, and contacting the feed stream with a catalyst in the reaction zone. A hydrogen flow rate into the reaction zone is adjusted, and a product stream comprising ethyleneamines is extracted. The catalyst includes a carrier component selected from alumina, silica, and combinations thereof; and an active component having a first metal, a second metal, and a third metal. The first metal is selected from cobalt, nickel, and copper, the second metal is selected from rhenium, ruthenium, chromium, zinc, sodium, calcium, magnesium, strontium, lithium, potassium, barium, cesium, lanthanum, tungsten, iron, silver, titanium, manganese, aluminum, rhodium, platinum, palladium, iridium, and combinations thereof, and the third metal is niobium.

A multilayer piezoelectric element includes: (i) multiple piezoelectric ceramic layers, wherein: a primary component constitutes a perovskite structure of an alkali niobate; at least one of calcium, strontium, and barium, and silver, are contained; 0.1-2.0 mol of lithium, and 1.5-4.0 mol of silicon, per 100 mol of the primary component, are contained in a manner that a ratio of Li / Si becomes 0.025 or higher but under 0.40; and as measured with an X-ray diffraction measurement, a strongest diffraction line intensity (Imax) at 10.00°≤2θ≤50.00°, a strongest diffraction line intensity (IL2S) at 26.50°≤2θ≤27.50°, and an average value of diffraction line intensity (IBG) at 27.50°≤2θ≤29.00° satisfy a relationship R1=(IL2S−IBG) / (Imax−IBG)×100≥0.20; and (ii) internal electrodes that are placed between the multiple piezoelectric ceramic layers, and formed by a metal whose silver content is 80% by mass or higher.

The application relates to the technical field of barium titanate preparation, and discloses a preparation method of barium titanate powder, which comprises the following steps: (1) adding 15% ammonia water solution into a stirring tank, weighing a certain amount of TiCl4 and slowly dropping the TiCl4 into the stirring tank, continuously stirring for 1 h, and obtaining a titanium source solution; (2) adding pure water into a heatable stirring tank, continuously stirring, weighing a certain amount of Ba(OH)2.8H2O and putting the Ba(OH)2.8H2O into the stirring tank, heating and raising the temperature to 100 DEG C and keeping for 2 h, using 15% ammonia water solution to adjust the PH to 13.5, and obtaining a barium source solution; (3) slowly adding the titanium source solution into the barium source solution, then transferring the mixed solution into a hydrothermal reaction kettle, then adding a reaction regulator into the reaction kettle, collecting the solid after multiple washing and drying, and high-temperature calcining the solid, so as to obtain the barium titanate powder; and the application has the effect of improving the tetragonal phase content of the barium titanate powder.

A hydrogen production method includes the heating of a catalyst in a furnace under reducing conditions to a first temperature, exposing the catalyst to water at a second temperature, and forming oxygen and hydrogen by thermolysis of the water, where the catalyst may include a barium niobate-based perovskite structure having the chemical formula of Ba1−x(AE)xNb1−(y+z)(AE)yMzO3−δ wherein AE is an alkaline earth (AE) element and M is a metal. M may include a transition metal or a rare earth metal. AE may include Mg, Ca, Sr, or a combination thereof. AE may alternatively include K, Rb, Cs or a combination thereof. M may include Fe, Co, Ni, Y, Yb, W, Ta, Pr, or a combination thereof. M may include Sc, Ti, V, Cr, Mn, Cu, Zn, Zr, Mo, La, Ce, Sm, Gd, W or a combination thereof.

Cathode and electrochemical cells are provided in which a barium, bismuth, or nickel additive is included to improve the stability of manganese dioxide at high voltages. The metal additives provided herein improve the performance of electrochemical cells.

The invention relates to the technical field of zinc hydrometallurgy, and discloses a method for rapidly determining the content of calcium, iron and barium in strontium carbonate by using ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry), a strontium carbonate sample is directly dissolved by using dilute nitric acid, filtration is not needed, and the pretreatment process is simplified; meanwhile, by optimizing instrument parameters and analysis wavelength of ICP-AES, rapid, synchronous and accurate determination of three impurity elements of calcium, iron and barium is realized. The method is easy and convenient to operate, high in analysis speed, good in precision and high in accuracy, can meet the requirement for rapid monitoring of the strontium carbonate raw material quality in the zinc hydrometallurgy industry, and provides reliable technical support for optimizing lead removal process parameters, improving the cathode zinc quality and reducing the production cost.

A dielectric composition includes a main component containing tantalum and at least one of barium or strontium, and a subcomponent containing calcium and silicon.

The present invention provides novel infrared-transmitting material particles that can block visible light while transmitting infrared light. [Solution] Composition formula: A x Bi y O z It contains a complex bismuth oxide represented by, In the above compositional formula, element A is one or more elements selected from calcium, strontium, and barium, Bi is bismuth, and O is oxygen. The above compositional formula comprises infrared-transmitting material particles where x, y, and z satisfy the relationships 2.5 ≤ z / y ≤ 4.0 and 0.6 ≤ x / y ≤ 1.8.

An improved atomized powder metal material containing an increased amount of free graphite after heat treatment and / or sintering is provided. The powder metal material is typically a ferrous alloy and includes carbon in an amount of 1.0 wt. % to 6.5 wt. % and silicon in an amount of 0.1 wt. % to 6.0 wt. %, based on the total weight of the powder metal material. The powder metal material can also include various other alloying elements, for example at least one of nickel (Ni), cobalt (Co), copper (Cu), tin (Sn), aluminum (Al), sulfur (S), phosphorous (P), boron (B), nitrogen (N), chromium (Cr), manganese (Mn), molybdenum (Mo), vanadium (V), niobium (Nb), tungsten (W), titanium (Ti), tantalum (Ta) zirconium (Zr), zinc (Zn), strontium (Sr), calcium (Ca), barium (Ba) magnesium (Mg), lithium (Li), sodium (Na), and potassium (K).

The present invention relates to a phosphorus-rich nano sponge comprising a porous matrix having an average size of less than 1000 nm and stabilized with a surface-active agent wherein the porous matrix is held together by ionic linkages of one or more of transition metals selected from iron, copper, titanium, vanadium, nickel, cobalt, post transition metals selected from zinc, cadmium, aluminum, tin, lead, bismuth, alkaline earth metals selected from calcium, magnesium, barium and strontium, metalloids selected from silicon, boron and tellurium, alkali metals selected from potassium, sodium and lithium, lanthanides selected from cerium, gadolinium, europium, or mixed metals. The phosphorus-rich nano sponge is selectively enriched for sustained and targeted delivery of molecular payloads.

The application discloses an iron-based barium sodium niobate ceramic material with high energy storage performance and a preparation method thereof. 4‑2x Sm 2x Na2Fe x Nb 10‑x O 30 , wherein 1<=x<=1.25. Barium carbonate, samarium oxide, sodium carbonate, ferrous oxide and niobium pentoxide are used as raw materials, and a standard solid-phase method is adopted to sinter the iron-based barium sodium niobate ceramic material. In the product formula, iron is used to replace niobium in the barium sodium niobate, which is lead-free, environment-friendly, rich in iron reserves and low in price, and is beneficial to control the cost of raw materials. In addition, the iron replacement is beneficial to enhance the relaxor ferroelectric performance of the material, can obtain a more slender hysteresis loop, and improves the energy storage efficiency of the material. The prepared ceramic material has few pores and cracks, high density, and the microstructure is obviously improved, the grain size is more fine and uniform, the ferroelectric polarization intensity and the breakdown field strength are significantly improved, the problem that the barium sodium niobate material is difficult to sinter is solved, and the ferroelectric performance and the energy storage performance are significantly improved.

The application discloses a barium-based rare earth synergistic type ultra-high insulation alkali-free glaze composition for spark plugs and a preparation method and application thereof, and belongs to the technical field of spark plug manufacturing. In order to solve the problem that the high-temperature insulation performance of the glaze of a spark plug is insufficient due to ion migration in the prior art, the application provides an alkali-free (containing no monovalent metal ion), low calcium and magnesium, high barium, rare earth and fluoride containing ultra-high insulation glaze composition for the surface of a ceramic insulator of a spark plug, and a preparation method and glazing and sintering process of the glaze. The application is a new type of alkali-free glaze taking high content BaO as an insulation core, B2O3 as a low-temperature fluxing main body and rare earth oxides as an anti-crystallization and performance enhancer, and realizes the unification of ultra-high high-temperature insulation performance, low-temperature sintering and a wide process window.

The invention relates to the technical field of mineral content detection, in particular to a method for simultaneously determining total barium and sulfur in barite through acid dissolution-inductively coupled plasma emission spectrometry. The method comprises the following steps: adding nitric acid and hydrochloric acid into barite, heating on an electric heating plate, adding a chromium internal standard solution and a nitric acid solution, heating, cooling, and determining by using an inductively coupled plasma emission spectrometer. According to the method, simultaneous determination is achieved in an acid dissolution mode, the detection efficiency is improved, time and cost are saved, the whole test solution preparation process is relatively simple, accurate volume determination is not needed, sample digestion treatment can be completed through common means such as electric hot plate heating under conventional laboratory conditions, and the method is more stable, easy and convenient to operate, easy to master and suitable for large-scale popularization and application. The reproducibility is good, and popularization and application are convenient. Meanwhile, the method can improve the accuracy and precision of a measurement result, so that the measurement result is more reliable.

A method of increasing porosity of graphitic carbon black comprises combining graphitic carbon black having a Raman planar size (La) of at least 20 Angstroms with at least 100 ppm of an alkaline earth element selected from strontium, barium, and a mixture of both to form a mixture, and contacting the mixture with an etchant at a temperature of 900-1400° C. until 2%-85% of the mass of the carbon black is lost.

This invention belongs to the field of intelligent piezoelectric materials technology, and discloses a grain-oriented piezoelectric ceramic material and its preparation method. The grain-oriented piezoelectric ceramic material is... <001> Oriented and ferromagnetic barium titanate / strontium-based template seed crystals, with the general formula: X Pb 1‑1.5x R x (B1,B2)O3- Y Pb 1‑y A y (B1,B2)O3-(1- X - Y-Z PbB3O3- Z The ceramic matrix of PbTiO3, wherein A is one or more of barium, strontium, calcium, and bismuth; B1 is one or more of magnesium, nickel, indium, and scandium; B2 is one or more of niobium, tantalum, and antimony; B3 is zirconium or tin; and R is one or more of Sm, La, Nd, Eu, Ce, Pr, Dy, and Er. x is between 0.001 and 0.2, y does not exceed 0.1; X is between 0.1 and 0.3, Y is between 0 and 0.2, and X+Y+Z=1. The raw materials are calcined according to the general formula to obtain perovskite powder. Subsequently, through casting, lamination, cutting, debinding, and calcination, the grain-oriented piezoelectric ceramic is finally obtained. This process can achieve high piezoelectric performance while maintaining a high Curie temperature, solving the problem of the incompatibility between high piezoelectric performance and high phase transition temperature in materials.

The present invention relates to a dielectric composition and an electronic component. The dielectric composition contains at least any one of barium and strontium and tantalum as a main component, and contains calcium and silicon as a subcomponent.

The invention discloses a low-alloy HT250 casting and a preparation method thereof, and belongs to the technical field of casting. The casting consists of the following components in percentage by mass: 3.25 to 3.35 percent of C, 1.7 to 1.85 percent of Si, 0.8 to 1.1 percent of Mn, 0.2 to 0.35 percent of Cr, less than or equal to 0.1 percent of P, 0.05 to 0.01 percent of S, less than or equal to 0.1 percent of Cu, 0.045 to 0.055 percent of Sn and the balance of Fe. The sum of other measurable alloy amounts is less than or equal to 0.15%, and the balance is Fe. A traditional manganese-copper-antimony system is replaced by silicon-manganese-chromium-tin composite alloying, two-stage silicon-barium-calcium inoculation and green sand molding are combined, and an HT250 casting with A-type graphite larger than or equal to 85% and pearlite larger than or equal to 90% is directly obtained in a casting state. Normalizing heat treatment is omitted, cost per ton is reduced by 12-15%, and the method is compatible with green sand flow line production and suitable for the fields of transmission connecting pieces, shells, hydraulic valves and the like with double requirements for cost and performance.

This application belongs to the field of magnesium alloy technology, and more specifically, relates to a barium-containing cast magnesium alloy, its preparation method, and its application. This application provides a barium-containing cast magnesium alloy with a small two-phase temperature range, good casting performance, and low hot cracking tendency, achieved through the effective addition of barium via a melt reaction between magnesium melt and barium carbonate. The barium content in the magnesium alloy prepared by this method is not limited by the magnesium-barium master alloy; the barium content in the magnesium-barium alloy obtained in this application ranges from 0.1% to 16 wt.%.

The invention discloses tetragonal-phase barium titanate powder as well as a preparation method and application thereof, and relates to the technical field of inorganic functional materials. Comprising the following steps: sulfonating a template agent to prepare a modified template agent; mixing a barium source, a titanium source and the modified template agent in proportion to prepare a precursor; and calcining the precursor in an inert negative pressure environment to prepare the tetragonal barium carbonate powder. Wherein the sulfonation treatment template agent is beneficial to enhancing the stability and uniformity of ion adsorption and eliminating abnormal growth of crystal grains caused by non-uniform ion adsorption; calcining in an inert negative-pressure gas atmosphere, so that Ba and Ti atoms can be orderly arranged at low temperature, and the purpose of synthesizing tetragonal-phase barium titanate at low temperature is achieved. Namely, according to the preparation method disclosed by the invention, the uniform and nanoscale tetragonal-phase barium titanate powder can be efficiently prepared in a low-temperature state, the prepared tetragonal-phase barium titanate powder is good in dispersity, uniform in particle size and controllable in size, and the application field of nano barium titanate is greatly widened.

This invention relates to the field of ductile iron casting technology and provides a silicon-barium inoculant for preparing thick-section ductile iron castings. Its chemical composition, by weight percentage, is: Si 65-70%; Ca 0.5-1.5%; Ba 4.0-6.0%; Al <1.0%; with the balance being Fe and unavoidable impurities. Barium reacts with oxygen and sulfur in molten iron to form high-melting-point compounds, becoming the nucleus for graphite precipitation, inhibiting the formation of free cementite, refining eutectic clusters and grains, resulting in uniform graphite distribution and improved matrix structure. Simultaneously, barium hinders carbon and silicon diffusion, prolongs inoculation time, improves the uniformity of the casting cross-section structure, and is suitable for thick-section castings and continuous casting production. This inoculant improves plasticity and optimizes machinability while ensuring casting strength; it also has good melting effect and produces less slag, simplifying the production process and avoiding the risks associated with using metallic barium, resulting in high production safety.

Provided is high-purity metallic barium which has a high purity and in which the content of magnesium (Mg), which is an impurity, has been reduced. The high-purity metallic barium is provided using metallic barium having a magnesium (Mg) content of 3 ppm by weight or less.

The invention belongs to the technical field of single crystal material preparation, and provides a barium-magnesium bimetal boron nitride compound-based solvent (Ba-Mg DMB), which significantly improves the yield of hexagonal boron nitride (h-BN) single crystals under high temperature and high pressure (HPHT) conditions, and further improves the crystal quality. Compared with the yield of about 12% of a barium-based solvent, the yield of the Ba-Mg DMB solvent is increased by 4.8 times, and the stable yield of about 57.3% is achieved. Researches find that under the HPHT condition, the magnesium element in Ba-Mg DMB can effectively remove carbon and oxygen impurities, which plays a key role in promoting the obtaining of h-BN single crystals with excellent quality. The high-quality characteristic is verified through detailed characterization of Raman spectrum, X-ray diffraction, X-ray photoelectron spectroscopy and the like, and is particularly reflected in photoluminescence and cathode luminescence characteristics. Through the high carrier mobility shown in the single-layer graphene, it is directly proved that the h-BN single crystal derived from Ba-Mg DMB can be used as an ideal packaging material of a two-dimensional device.

The invention belongs to the technical field of casting, and provides an oxygen-sulfur composite inoculant and a preparation method thereof, the oxygen-sulfur composite inoculant is prepared from ferrosilicon, ferromanganese, silicon calcium, silicon barium, ferrous sulfide, manganese dioxide, iron oxide and ferrous oxide; comprising 70 to 75 wt% of silicon, 1 to 1.5 wt% of calcium, 1 to 1.5 wt% of barium, 3 to 5 wt% of manganese, 0.6 to 1 wt% of sulfur, 1 to 1.5 wt% of oxygen and the balance of iron. When the oxygen-sulfur composite nucleating agent is applied, the problem that the internal graphitization effect cannot meet the basic requirement after an ultra-large casting is formed can be solved, the spheroidization level of the casting can reach the third level, the graphite size level basically reaches the sixth level, and then the requirement for the basic performance of the casting is met.

The invention belongs to the field of inorganic materials, and particularly relates to a preparation method of high-sphericity barium titanate powder. The method comprises the following steps: 1) preparing a functional template solution; 2) respectively preparing an organic titanium complexing solution and a barium-containing aqueous solution as a titanium source solution and a barium source solution; 3) slowly adding the titanium source solution into the functionalized template solution, continuously stirring for adsorption positioning, then adding the barium source solution to adjust the pH value, and then homogenizing and stirring to obtain a precursor solution; and 4) carrying out a hydrothermal reaction on the precursor liquid, and after the hydrothermal reaction is finished, carrying out centrifugal separation and cleaning, and drying to obtain the high-sphericity barium titanate powder. The method overcomes the defects of a traditional liquid-phase method and a solid-phase method, the two methods cooperate to form a brand-new interface confinement solid-phase growth method, the morphological characteristics and the particle size of the barium titanate powder can be effectively controlled, the particle size uniformity of the product is high, the sphericity degree is far higher than that of an existing industrialization scheme, the whole scheme is relatively low in industrialization difficulty, and the method is suitable for industrial production. The industrial popularization is facilitated.

A method for producing barium titanyl oxalate, characterized by a method for producing barium titanyl oxalate by mixing a solution (A liquid) containing oxalic acid and a solution (B liquid) containing a titanium source and a barium source, allowing them to react, and thereby producing barium titanyl oxalate, wherein the A liquid and the B liquid are supplied to one end side of a reaction liquid flow path, respectively, the A liquid and the B liquid are mixed within the reaction flow path, and the reaction liquid is discharged from the other end side of the reaction liquid flow path, after which solid-liquid separation of the reaction liquid is performed; the residence time of the reaction liquid within the reaction liquid flow path is within 30 seconds; or the A liquid and the B liquid are supplied to one end side of a reaction liquid flow path, respectively, the A liquid and the B liquid are mixed at one end side of the reaction liquid flow path, the reaction liquid is allowed to generate a vortex while moving toward the other end side of the reaction liquid flow path, and the reaction liquid is discharged from the other end side of the reaction liquid flow path, after which solid-liquid separation of the reaction liquid is performed.

A process for producing amines by reductive amination, the process includes introducing a feed stream, the feed stream comprising an amino alcohol and a reducing agent, and hydrogen in a reaction zone of a reactor, and contacting the feed stream with a catalyst in the reaction zone. A product stream comprising ethyleneamines is extracted. The catalyst includes a carrier component selected from alumina, silica, and combinations thereof; and an active component having a first metal, a second metal, and a third metal. The first metal is selected from cobalt, nickel, and copper, the second metal is selected from rhenium, ruthenium, chromium, zinc, sodium, calcium, magnesium, strontium, lithium, potassium, barium, cesium, lanthanum, tungsten, iron, silver, titanium, manganese, aluminum, rhodium, platinum, palladium, iridium, and combinations thereof, and the third metal is niobium.

A glass including: silicon; magnesium; strontium; and barium, in which the glass has, in mol % based on oxides, a content of SiO2 of 48.0 mol % or more, a content of Al2O3 of 20.0 mol % or less, a content of MgO of 0.1 mol % or more, a content of SrO of 0.1 mol % or more, a content of BaO of 0.1 mol % or more, and a content of R2O of 22.0 mol % or more, provided that R2 indicates an alkaline earth metal element, and the glass is substantially free of CaO, substantially free of TiO2, and substantially free of R12O, provided that R1 indicates an alkali metal element.

The utility model provides a barium powder weighing tool, which comprises a material storage funnel, a first valve plate, a weighing funnel, a second valve plate and a conveying device, the material storage funnel is used for containing barium powder, the first valve plate is arranged at a discharge port of the material storage funnel, the weighing funnel comprises a weighing bin and a weighing sensor, and the second valve plate is arranged at the discharge port of the material storage funnel. A feeding port of the weighing bin right faces a discharging port of the storage hopper, the weighing sensor is connected with the weighing bin and used for indirectly weighing the weight of barium powder in the weighing bin, the second valve plate is arranged at the discharging port of the weighing bin, the conveying device is arranged in the storage hopper, and the second valve plate is arranged on the discharging port of the weighing bin. The conveying device is used for conveying the barium powder into the weighing bin. The automatic weighing and discharging device has the advantages that automatic weighing and discharging of barium powder are achieved, weighing errors are reduced, production efficiency is improved, pollution and potential safety hazards of the barium powder are reduced, the accuracy of the using amount of the barium powder in quartz crucible production is effectively enhanced, and the production quality of quartz crucibles is guaranteed.

The invention discloses a fluoride-salt-free and nitrate-free low-temperature antimony-molybdenum ground coat for steel plate enamel as well as a preparation method and application of the low-temperature antimony-molybdenum ground coat, and belongs to the technical field of enamel. The ground coat is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, potassium feldspar, albite, antimony oxide, sodium tripolyphosphate and barium molybdate according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The ground coat is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the ground coat has good porcelain surface, luster and low-temperature firing adaptability and is suitable for a steel plate matrix, the firing temperature is 760-800 DEG C, and the firing time is 2-3 hours. The method can be used for producing green and environment-friendly enamel products.