17 results about "Barium carbonate" patented technology

The invention discloses a matte glaze and a preparation method thereof. The matte glaze comprises the following components by weight: 1-5 parts of zinc oxide, 5-15 parts of barium carbonate, 0-15 parts of zirconium silicate, 10-25 parts of potassium feldspar, 10-20 parts of kaolin, 5-15 parts of calcite, 5-15 parts of calcined talcum powder, 20-35 parts of a matte frit and 0.5-1 part of an additive. Specifically, the matte frit comprises the following components by weight: 30-50 parts of SiO2, 15-20 parts of Al2O3, 0.01-0.5 part of Fe2O3, 3-10 parts of CaO, 0.5-5 parts of MgO, 1-5 parts of K2O, 3-10 parts of Na2O, 3-10 parts of ZnO, 0.1-1 part of B2O3 and 10-25 parts of BaO. By introducing the matte frit, the melting temperature of the formula is lowered, the firing range of the formula isbroadened, and the glaze texture achieves a fine matte effect.

This invention discloses a black-based blue-spotted glaze with an earthworm-like pattern and its preparation method. The glaze consists of a body, a black base glaze, and a blue-spotted glaze from the inside out. The raw materials for the black base glaze are: feldspar, calcite, calcium borate, dolomite, talc, barium carbonate, quartz, bentonite, zirconium silicate, rutile, cobalt oxide, manganese oxide, and iron oxide. The raw materials for the blue-spotted glaze are: feldspar, limestone, alumina, talc, barium sulfate, Datong clay, zinc oxide, quartz, and titanium dioxide. The preparation method includes: 1. Wet ball milling the black base glaze raw materials to obtain a black base glaze slurry; 2. Wet ball milling the blue-spotted glaze raw materials to obtain a blue-spotted glaze slurry; 3. Bisque firing the body; 4. Applying the black base glaze slurry to the body and drying it; 5. Applying the blue-spotted glaze slurry to the body and drying it; 6. Oxidation firing and reduction firing of the body, followed by natural cooling to obtain the black-based blue-spotted glaze. The raw material formula of this invention is reasonable and environmentally friendly, which can improve the mechanical properties of the glaze; the preparation method is simple and the yield is high.

A barium carbonate slurry is sprayed onto the surface of the silicon nitride coating to form the barium carbonate coating. Using the above-mentioned barium carbonate-coated crucible, the probability of micron-level impurities in silicon ingots is significantly reduced during ingot production, decreasing from 8%-20% when using silicon nitride-coated crucibles to 0%. This effectively solves the technical problem of impurities in the ingot silicon production process and reduces the scrap rate of ingot silicon.

An asbestos free friction material composition and associated brake pad for vehicles including inorganic and / or organic and / or metallic fibers, at least a binder, at least a friction modifier or lubricant, at least a filler or abrasive and at least a soluble salt of barium and / or calcium and / or aluminum and / or silver with percentage between 0.5-10% by weight. Among them barium carbonate, calcium hydroxide, aluminum triacetate and silver acetate are preferably.

A method for exhaust aftertreatment of an internal combustion engine (10) with an exhaust system (20) in which a NOx storage catalyst (28) with a low-temperature storage component (48) made of cerium oxide and a high-temperature storage component (52) made of barium carbonate as well as an SCR catalyst (34) and / or particulate filter (30) with an SCR coating (32) arranged downstream of the NOx storage catalyst (28) in the flow direction of an exhaust gas of the internal combustion engine (10), comprising the following steps: - Modeling the loading state of the NOx storage catalyst (28), wherein - the charging of the low-temperature storage component (48) is determined by a first model for the charging of the low-temperature storage component (48), and - the loading of the high-temperature storage component (52) is determined by a second model for the loading of the high-temperature storage component (52), - Regenerating the NOx storage catalyst (28) by introducing unburned hydrocarbons into the exhaust system (20) of the combustion engine (10) when the high-temperature storage component (48) has reached a defined loading level and the SCR catalyst (34) or the particulate filter (30) with the SCR coating (32) has an operating temperature at which selective catalytic reduction of nitrogen oxides is possible, wherein - depending on whether the SCR catalyst (34) or the particulate filter (30) with the SCR coating (32) has an operating temperature at which selective catalytic reduction of nitrogen oxides is possible, at least two threshold values ​​are used, wherein - a first threshold value is provided at which a regeneration of the NOx storage catalyst (28) is carried out when the SCR catalyst (34) or the particulate filter (30) with the SCR coating (32) has reached its operating temperature and wherein - a second threshold is provided at which regeneration of the NOx storage catalyst (28) takes place independently of the temperature of the SCR catalyst (34) or the particulate filter (30) with SCR coating (32).

This invention belongs to the field of architectural ceramics, specifically disclosing a matte ultra-soft ceramic tile with a digital mold effect and its preparation method. The ceramic tile comprises, from bottom to top, a body, a base glaze layer, an intermediate glaze layer, a pattern layer, a digital micro-engraving ink layer, and a protective glaze layer. The raw materials for preparing the intermediate glaze layer, by weight, include: 20-35 parts of sodium feldspar, 5-10 parts of potassium feldspar, 5-10 parts of wollastonite, 5-15 parts of dolomite, 5-15 parts of washed clay, 5-20 parts of calcined talc, 3-8 parts of calcined kaolin, 2-5 parts of alumina, 10-20 parts of barium carbonate, 1-5 parts of calcined zinc oxide, and 2-5 parts of strontium carbonate. The raw materials for preparing the digital micro-engraving ink layer, by weight, include: 40-50 parts of inorganic materials, 3-8 parts of dispersant, and 40-60 parts of solvent; the inorganic materials contain bismuth vanadate, a low-temperature first glass powder, and a high-temperature second glass powder.

This invention discloses an insulating ceramic material for an electric heating film substrate and its preparation method. Using corundum sand, talc, magnesium carbonate, clay, barium carbonate, etc., as raw materials, the process involves batching, ball milling, re-batching, ball milling and uniform mixing, adjusting the slurry, plaster mold casting, drying, and firing to obtain a high-temperature insulating composite ceramic material product with a resistivity negative temperature coefficient far less than cordierite. The material obtained by this invention achieves a room temperature resistivity of 10. 14 Order of magnitude, ≥1×10 at 1000℃ 5 Ωm, flexural strength ≥100MPa. Coefficient of thermal expansion approximately 2×10⁻⁶. ‑4 / ℃ (25℃~1000℃), the product can be used to prepare substrates for electric heating films and other products, with a maximum heating temperature of 1000℃.

The present application relates to a kind of low dielectric loss and low temperature coefficient microwave dielectric ceramic and its preparation method, the preparation method includes the following steps: after mixing zinc lanthanum titanate, strontium source and auxiliary raw material, sequentially forming and sintering, the low dielectric loss and low temperature coefficient microwave dielectric ceramic is prepared;The auxiliary raw material includes any one or combination of at least two of calcium carbonate, manganese dioxide or barium carbonate.The present application selects zinc lanthanum titanate and strontium titanate with good microwave dielectric properties as basic raw material to ensure the basic performance of ceramic;Introduce appropriate amount of calcium carbonate, manganese dioxide and barium carbonate, effectively reduce the dielectric loss of ceramic, and improve its temperature characteristics;The present application reduces production cost and technical difficulty by solid phase reaction method, while ensuring the uniformity and stability of ceramic, effectively reduces the dielectric loss of microwave dielectric ceramic, and improves its temperature characteristics, further improves the performance of ceramic.

The application discloses a perovskite thermistor material, a preparation method and application thereof. The perovskite thermistor material is prepared from barium carbonate, bismuth oxide, lead oxide, sodium carbonate and potassium carbonate as raw materials by a solid phase reaction method, and has a chemical formula of (Ba 1‑y Re y )(Bi 1‑x R x )O3. In the formula, Re=Pb, 0≤y≤0.1; R=Na, K, 0≤x≤0.15. The perovskite thermistor material has a single perovskite structure. The material can be sintered into a porcelain at a low temperature, and the oxygen vacancies can be effectively adjusted under different sintering atmospheres, so that the material constant and the resistivity of the thermistor ceramic can be significantly reduced, and the perovskite thermistor material can be used for measurement and control in a temperature range of 40-160K at a low temperature.

The application provides a kind of excellent pitting-resistant nickel-based electrode, including welding core and electrode coating powder coated on the surface of welding core, and each component of the electrode coating powder comprises, by weight percentage, 35-50% of sodium hexafluoroaluminate, 25-35% of barium carbonate, 5-10% of 95% rutile, 1-2% of rutile titanium dioxide, 5-10% of quartz, 4-6% of 70% micro-carbon chromium iron, 3-5% of niobium iron, 1-3% of manganese iron, 1-1.5% of calcium alginate, 0.5-1% of alkali surface.The electrode uses special welding core and adds a certain proportion of Nb and other alloy elements through the electrode coating powder formula, adjusts the chemical composition of the electrode deposited metal, realizes the characteristics that the electrode deposited metal has excellent mechanical properties and corrosion resistance, effectively improves the operability during manual welding, improves the welding efficiency and reduces the repair rate.

The present application belongs to the technical field of ceramic glaze, and particularly relates to an environment-friendly ceramic color-changing glaze and a preparation method thereof. The environment-friendly ceramic color-changing glaze comprises the following components in parts by mass: zirconium silicate 30-45 parts; tungsten oxide 15-25 parts; titanium oxide 8-12 parts; kaolin 10-15 parts; barium carbonate 5-10 parts; nano-silicon dioxide 3-8 parts; rare earth composite oxide 0.5-2 parts; and the preparation method comprises the following steps: S1, raw material pretreatment; S2, glaze slurry preparation; and S3, glazing and firing. The formula design is scientific and reasonable, heavy metals such as lead and cadmium are completely replaced, and the environment-friendly standard is met; the color-changing response speed is improved; through adjustment of the rare earth ratio, customized properties such as multi-color system, wide temperature range and high hardness are realized; the existing ceramic production line is adapted, the firing temperature range is wide, and the yield is high; the raw material cost is reduced, the rare earth composite oxide can be recycled, and no additional anti-fouling treatment is needed.

The application discloses a catalyst-free small-particle-size Na2BaCo(PO4)2 material synthesis method for magnetic refrigeration, and the method comprises the following steps: firstly, sodium carbonate, barium carbonate, cobalt powder and diammonium hydrogen phosphate are weighed and added into a dilute nitric acid solution and stirred until dissolved; secondly, citric acid is added for dissolution, then ammonia water is added dropwise, and then ethylene glycol is added dropwise and stirred uniformly; thirdly, continuous stirring is conducted until a sol is formed, and then the sol is dried to obtain a gel; fourthly, the gel is calcined in stages and then high-temperature calcined; and fifthly, the gel is sintered into a phase. The sol-gel process is adopted, highly uniform dispersion and mixing of reactants are realized at a molecular level, the highly uniformity and small grain size of the synthesized material are ensured, high reactivity is obtained, a catalyst is not needed to participate in the reaction, the Na2BaCo(PO4)2 material with smaller particle size, more concentrated size distribution and more consistent microstructure is obtained, the magnetic heat performance and stability of the material are improved, and the material is suitable for the fields of magnetic refrigeration and related functional materials.

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.

The present application relates to a kind of low alloy high-strength steel underwater wet welding with self-shield flux-cored wire, belong to welding material technical field, including external metal thin skin and internal flux, metal skin is low carbon steel metal strip, flux includes ore oxide, fluoride, barium carbonate, hydroxyethyl cellulose and alloy powder.The welding wire of the present application can produce more gas under deep water conditions, part of the gas ionizes into arc plasma, maintains arc stable combustion, the rest enters the bubble, thereby overcoming the compression effect of deep water high pressure on bubble, provide enough space for arc stable combustion;By adding various alloy powders in flux, improve the welding metallurgical process under deep water conditions, improve the mechanical properties of welded joint.Using the self-shield flux-cored wire in the present application, when full position welding is carried out under the condition of water depth of 500 meters, the welding process is stable, the weld appearance is beautiful, and there is no obvious defect in the weld.

This invention discloses a method for detecting the specific activity of C14 barium carbonate, belonging to the field of radioactivity detection technology. The method includes: dissolving a C14 barium carbonate sample in a weak acid solution to generate a test solution containing bicarbonate ions; then directly mixing the test solution with a scintillation fluid to obtain a scintillation sample; finally, measuring its radioactivity activity using a liquid scintillation counter and calculating the specific activity based on a standard curve. This invention uses a weak acid to dissolve the C14 barium carbonate sample to generate a test solution containing bicarbonate ions that is directly mixed with the scintillation fluid, omitting the alkaline absorption step and simplifying the detection process from four steps in existing methods to two steps. Furthermore, it eliminates the need for a sealed gas absorption device, removing accumulated errors during sample transfer and the additional background introduced by the alkaline solution. Therefore, this invention reduces equipment requirements and improves detection accuracy and ease of operation.

The application discloses artistic ceramic glaze and a preparation method and application thereof, and belongs to the technical field of artistic ceramic glaze, and raw materials of the application include sericite 25-35%, silicon dioxide 18-30%, quartz 12-18%, dextrin 4-10%, calcium oxide 3-6%, dolomite 0.6-6%, chromium oxide 0.4-4%, barium carbonate 1-5%, kaolin 11-15% and antibacterial agent 0.5%-3%. Meanwhile, a silver-loaded carrier with a metal organic framework structure is self-assembled and synthesized, and the silver-loaded carrier with the metal organic framework is calcined at high temperature to obtain the antibacterial agent with a long-acting slow-release effect. The artistic ceramic glaze has the powder gold matt effect, uniform coloring and high ornamental value, and has the long-acting slow-release antibacterial effect; meanwhile, the artistic ceramic glaze has high adaptability to process conditions and simple process and is suitable for large-scale production.