68 results about "Calcium titanate" patented technology

Disclosed is a curable composition which contains: a curable component that is radically polymerizable and contains an ethylenically unsaturated double bond; and an inorganic filler that is at least one substance which is selected from the group consisting of titanium oxide, calcium titanate and strontium titanate.

The application provides a high-thermal-conductivity radiation refrigeration coating for a 5G communication base station cabinet and a preparation method thereof, and belongs to the technical field of coatings. A SiC@BN / TiB2 three-phase fiber framework obtained through three-stage calcination is bonded with methylphenyl silicone resin through a silane coupling agent to form a longitudinal high-speed thermal conduction framework. Starburst calcium titanate and edge in-situ magnesium fluoride form a refractive index ladder and a rough multi-faceted structure, which not only reflects ultraviolet-near infrared light, but also endows weather resistance. Holmium / ytterbium co-doped calcium fluoride nanosheets are transversely overlapped to scatter near infrared light and convert the near infrared light into medium-far infrared radiation which can penetrate the atmospheric window, thereby further dissipating heat. Through mutual cooperation of a longitudinal continuous heat conduction path, a transverse heat dissipation network, optical multiple scattering and energy downshift radiation, stable chemical bond network support is achieved to realize high-efficiency, long-term reliable heat dissipation performance.

The present invention provides a thermosetting resin composition that yields a cured product (dielectric substrate) with excellent high dielectric constant and low dielectric loss tangent, a dielectric substrate made from the resin composition, and a microstrip antenna equipped with the dielectric substrate. [Solution] The thermosetting resin composition of the present invention comprises (A) a thermosetting resin, (B) a high dielectric constant filler, and (C) a coupling agent represented by the following general formula (1), wherein the high dielectric constant filler (B) comprises at least one selected from calcium titanate, strontium titanate, barium titanate, magnesium titanate, and titanium oxide. TIFF2026111704000022.tif16153

The invention belongs to the technical field of electronic materials, and particularly relates to a calcium titanate composite wave-absorbing material and a preparation method thereof. The material comprises the following components: a carbon material, metal powder, calcium titanate and organic silicon resin. The preparation method comprises the steps of blending, ball milling, polymerization molding and the like. The material has a three-layer structure, namely a calcium titanate resin layer, a calcium titanate low-carbon resin layer and a calcium titanate high-carbon resin layer. The effective bandwidth with the wave absorbing efficiency smaller than or equal to-10 dB covers the whole S wave band, the lowest wave absorbing efficiency is-31.5 dB, the preparation process is simple, raw materials are easy to obtain, and the material has application potential in the fields of 5G technology electromagnetic compatibility and equipment electromagnetic stealth.

The invention belongs to the technical field of coating preparation, and provides a high-thermal-conductivity radiation refrigeration heat dissipation coating for an LED illumination module and a preparation method of the high-thermal-conductivity radiation refrigeration heat dissipation coating. The preparation method comprises the following steps: firstly, cooperatively coating a hexagonal boron nitride sheet with dopamine and tannic acid, and performing in-situ deposition of zinc oxide to obtain a sheet-shaped heat-conducting filler with low interface thermal resistance; secondly, hydrothermally generating magnesium silicate by utilizing the lignocellulose template, locally carbonizing in a nitrogen atmosphere, and grafting aminopropyl silane to form a heat-conducting framework; ytterbium-doped calcium titanate hollow spheres are prepared through a citric acid complexation method, an aluminum oxide-phosphate double-layer shell is constructed, three kinds of functional particles are dispersed with methyl-phenyl siloxane resin, a coupling agent and a low-volatility solvent at a high speed according to a set proportion, and the high-thermal-conductivity radiation refrigeration heat dissipation coating of the LED illumination module is obtained after vacuum defoaming.

The invention provides a preparation method of high-density ZTA ceramic granulation powder, which comprises the following steps: mixing aluminum oxide powder, nano zirconium oxide and calcium titanate powder according to a certain proportion, dispersing in deionized water, carrying out ball milling, and adding a binder, a dispersant, a release agent and a defoaming agent during ball milling; and finally, sieving the ball-milled slurry by using a 90-mesh sieve, performing spray granulation by using centrifugal spray granulation equipment, and screening granulation powder under a 100-mesh sieve to obtain the ZTA ceramic powder. By introducing calcium titanate as a sintering aid, the sintering temperature of the ZTA ceramic is successfully reduced to 1500 DEG C from 1600 DEG C or above, a glass phase generated by a traditional aid is avoided during sintering, flaky calcium hexaluminate is generated in situ, grains can be refined, crack deflection can be induced, and high density of 98.4% or above is realized, so that the toughness and strength of the material are synergistically improved.

The invention provides submerged arc sintered flux for welding SA-508Gr. 3C1.1 steel in third-generation nuclear power equipment and a preparation method of the submerged arc sintered flux. The submerged arc sintered flux comprises, by weight, 20-40 parts of fluorite, 35-50 parts of magnesia, 15-30 parts of aluminum oxide, 10-20 parts of wollastonite, 1-5 parts of silica powder, 0.5-2 parts of silicon iron, 2-5 parts of manganese ore, 1-5 parts of calcium titanate and 1-5 parts of rare earth materials. And the water glass accounts for 25-30% of the sum of the flux powder. The flux provided by the invention has good welding manufacturability, excellent slag removal, beautiful formation and more excellent mechanical properties.

Disclosed is a method for preparing porous adsorbent material (22), the method comprising providing a mixture of metakaolin (10) and calcium titanate (12, CaTiO3), mixing the mixture with alkali solution (14) and reacting to obtain alkali-activated modified material (16), providing oil comprising oleic acid (18) as a foaming agent to the alkali-activated modified material (16), and providing hydrogen peroxide (20) as a foaming agent to the alkali-activated modified material (16), and allowing the alkali-activated modified material to foam in the presence of the hydrogen peroxide to obtain porous adsorbent material (22) comprising alkali-activated titanate-modified metakaolin. Also disclosed is porous adsorbent material comprising alkali-activated titanate-modified metakaolin, a flow- through column (24) comprising the porous adsorbent material and system for treating contaminated water.

The invention discloses a preparation method of a mold shell for titanium alloy investment casting, and belongs to the technical field of titanium alloy precision casting. According to the high-stability zirconium oxide-based surface layer coating for titanium alloy investment casting and the preparation method of the mold shell of the high-stability zirconium oxide-based surface layer coating, firstly, silica sol, micron-sized yttrium oxide stabilized zirconium oxide powder, micron-sized calcium titanate powder, a wetting agent and a defoaming agent are mixed to prepare slurry, the slurry is used for preparing the first two layers of a wax mold, and sanding is conducted; then mixing silica sol, micron-sized mullite powder, a wetting agent and a defoaming agent to prepare slurry, preparing the rear six layers of a coated wax mold and sealing slurry by using the slurry, and finally performing steam dewaxing and sintering to obtain the mold shell. The method solves the problem that a high-activity molten titanium alloy reacts with a mold shell surface layer material in the casting process, so that a brittle layer on the surface of a casting is too large; the surface-based coating and the mold shell prepared from the surface-based coating are mainly suitable for precision casting of titanium alloy and have good industrial application prospects.

A porous particulate nanocomposite material comprising, as determined by X-ray diffraction: carbon; an orthorhombic CaTiO3 crystalline phase; and, a rhombohedral MgTiO3 crystalline phase. Based on the total number of atoms in the nanocomposite material and as determined by energy dispersive X-ray spectroscopy (EDX): the atomic concentration of carbon (C) is from about 1 to about 5 atom % (at. %); the atomic concentration of titanium (Ti) is from about 20 to about 35 at. %; the atomic concentration of magnesium (Mg) is from about 5 to about 15 at. %; and, the atomic concentration of calcium (Ca) is from about 5 to about 15 at. %.

A resin composition for molding, which contains a curable resin and an inorganic filler that contains alumina particles and calcium titanate particles and / or strontium titanate particles, the total content of the calcium titanate particles and the strontium titanate particles being 5.0-15.0 vol% with respect to the entire inorganic filler, and the content of the calcium titanate particles and the strontium titanate particles being 5.0-15.0 vol% with respect to the entire inorganic filler. The content of the entire inorganic filler is more than 60 vol% with respect to the entire molding resin composition.

An air cathode and an aluminum-air battery, wherein the air cathode contains an active material, the active material being any one or a mixture of two of the following materials: nickel oxide, iron oxide, manganese oxide, lithium-ion nickel oxide, lithium-ion iron oxide, lithium-ion manganese oxide; strontium titanate doped with any one or two of iron, nickel, manganese, and lanthanum; calcium titanate doped with any one or two of iron, nickel, manganese, and lanthanum; magnesium titanate doped with any one or two of iron, nickel, manganese, and lanthanum; lanthanum nickelate doped with calcium and / or strontium; lanthanum ferrite doped with calcium and / or strontium; lanthanum cobaltate doped with calcium and / or strontium; lanthanum manganate doped with calcium and / or strontium; and graphite or metal carbonitride loaded with a metal.

The present disclosure provides: a spherical calcium titanate powder which has excellent resin filling properties and can achieve a higher relative dielectric constant and a low dielectric loss tangent; and a resin composition containing the spherical calcium titanate powder. This spherical calcium titanate powder has an average particle diameter (D50) of 4-10 [mu] m, and the proportion of particles having a particle diameter of 2.0 [mu] m or less is 4.0 vol% or less. Wherein the average particle diameter (D50) is calculated from a particle size distribution obtained by laser diffraction / scattering particle size distribution measurement. A resin composition according to the present disclosure contains the spherical calcium titanate powder and at least one resin selected from the group consisting of thermoplastic resins and thermosetting resins.

The present invention addresses the problem of providing a calcium titanate particle material in which changes in chromaticity due to irradiation with ultraviolet light are suppressed. This calcium titanate particle material has a circularity of 0.8 or more, a volume average particle diameter ([mu] m), and a specific surface area (b (m2 / g)), a being 0.1-8, and ab being less than 4. With this configuration, the relationship between the volume average particle diameter and the specific surface area can be rationalized, and as a result, the change in chromaticity over time can be suppressed.

A new material that may be embodied in a wafer. The wafer may include a silicon (Si) substrate. The wafer may also include a strain control layer formed on the Si substrate. The strain control layer may include strontium titanate (STO) or calcium titanate (CTO). The wafer may further include a twin-free perovskite oxide layer formed on the strain control layer and having a residual in-plane biaxial tensile strain imposed at least in part by the strain control layer. The twin-free perovskite layer may include a single crystal rare earth aluminate.

The application discloses an environment-friendly ceramic and a preparation method thereof, and belongs to the field of ceramics. The method comprises the following steps: dissolving zinc nitrate, zirconium nitrate and iron nitrate in a solvent and stirring and mixing to obtain a mixed solution; grinding and mixing kaolin, illite, magnesium oxide, iron titanate, calcium titanate, titanium, silicon powder, carbon powder and aluminum oxide, and adding into the mixed solution to mix to obtain a first slurry; taking the first slurry, adding zinc oxide and iron oxide into the taken first slurry to mix to obtain a second slurry; adding kaolin, zirconium oxide, boron carbide, carbon powder, boron oxide, aluminum, boron, titanium, silicon and titanium dioxide into a dispersing solvent to mix to obtain a third slurry; and performing sintering treatment on the prepared embryo to obtain the ceramic. The ceramic has high mechanical strength, good corrosion resistance, good antibacterial property, is not prone to cracking or damage when the external temperature changes rapidly, has stable overall performance, and has high durability.

The application belongs to the technical field of textile machinery preparation, and particularly relates to a calcium titanate-based anti-static ceramic guide and a preparation method thereof. The calcium titanate-based anti-static ceramic guide comprises the following components in percentage by mass: 72-95% of calcium titanate and 5-28% of a functional additive, wherein the functional additive comprises titanium nitride and zirconium nitride; the preparation method comprises the following steps: S1: mixing calcium titanate powder, titanium nitride powder and zirconium oxide powder, and mixing and granulating the mixed powder with an organic matrix to obtain injection granules, and injection molding to obtain a ceramic guide blank containing the organic matrix; S2: performing heat debinding on the ceramic guide blank, and then performing high-temperature reaction under a nitrogen atmosphere to obtain a ceramic guide sintered body; and S3: performing hot isostatic pressing treatment on the ceramic guide sintered body. The CaTiO3 is used as a matrix, the functional additives TiN and ZrN are combined, and the anti-static ceramic guide with good wear resistance, electrical conductivity and anti-static capability is obtained.

An object to be achieved is to provide a calcium titanate particle material in which change in color due to radiation of ultraviolet rays is suppressed. A calcium titanate particle material of the present disclosure for achieving the above object has: a circularity of 0.8 or more; and a volume-average particle diameter and a specific surface area respectively represented by “a” (μm) and “b” (m2 / g), the “a” being 0.1 or more and 8 or less, “ab” being less than 4. Since the calcium titanate particle material has this configuration, the relationship between the volume-average particle diameter and the specific surface area is made appropriate. As a result, the calcium titanate particle material allows suppression of change in color occurring over time.

A rubber resin material with a high thermal conductivity and a high dielectric constant and a metal substrate using the same are provided. The rubber resin material includes a rubber resin composition, at least one first inorganic filler, and at least one second inorganic filler. The rubber resin composition includes 30 wt % to 60 wt % of a liquid rubber, 10 wt % to 30 wt % of a polyphenylene ether resin, and 20 wt % to 40 wt % of a crosslinker. A molecular weight of the liquid rubber ranges from 2500 g / mol to 6000 g / mol. The at least one first inorganic filler is selected from the group consisting of aluminum oxide, boron nitride, magnesium oxide, zinc oxide, aluminum nitride, silicon carbide, and aluminum silicate. The at least one second inorganic filler is selected from the group consisting of silica, strontium titanate, calcium titanate, and titanium dioxide.

The application provides a respiratory intervention device and an intervention method. The device comprises a flexible electrocardio sensor, a signal processing unit, a control unit and a body position adjusting device. The flexible electrocardio sensor comprises an electrode composite layer, a first insulating layer, an electromagnetic shielding layer and a second insulating layer arranged in sequence. The electrode composite layer comprises a first electrode, a second electrode and a polarity layer arranged between the first electrode and the second electrode. The first electrode is used for electrical connection with the signal processing unit, and the surface of the first electrode is gold-plated. The second electrode is suspended. The polarity layer comprises barium titanate and / or calcium titanate. The application realizes real-time detection of the patient's respiration through non-contact detection of the electrocardio signal, and the experience is better and the safety is higher. When electrocardio detection is performed, the polarity material with high dielectric constant is added, the coupling capacitance is increased, the electrocardio signal attenuation is reduced, the respiratory wave is accurately separated, and the occurrence of misjudgment and other operations is reduced.

The application relates to a formamidinium-based perovskite material based on variable valence cation doping and a preparation method thereof. The material takes formamidinium iodide and lead iodide as starting reactants, takes cobalt iodide, manganese iodide, iron iodide, cadmium iodide or antimony iodide as a dopant, is doped with variable valence metal cations through a one-step synthesis method, and stable formamidinium-based perovskite material is obtained. Compared with undoped formamidinium lead iodide, the stability of the formamidinium-based perovskite material is greatly improved, and the phase transition time is improved by two orders of magnitude, which means that the application has great significance in designing new high-efficiency and stable photoelectric conversion devices. The product size is controllable, the cost is low, the repeatability is good, the operation is simple and the like, the material can be used for in-depth research on the intrinsic properties of organic-inorganic hybrid perovskite materials, and new high-efficiency photoelectric conversion devices are further designed. The material overcomes the difficulty that the existing perovskite material has poor stability in the application process, and has higher stability compared with the perovskite material obtained by only changing the preparation method, and has good application prospect in the field of photoelectric conversion.

This resin composition for molding contains: an epoxy resin; a curing agent containing an active ester compound and a phenol curing agent; and an inorganic filler containing calcium titanate particles.

The invention relates to the technical field of special tempered glass used in the fields of aerospace, vehicles, ships and the like, and particularly discloses damp-heat aging resistant perovskite PSC charging glass and a preparation method thereof. The charging glass sequentially comprises a glass substrate, a transparent electrode layer, a hole transport layer, a zirconium-doped perovskite active layer, an electron transport layer, a metal electrode layer and a composite protective layer from bottom to top, the zirconium-doped perovskite active layer contains a perovskite material of which the chemical formula is CsPb < 1-x > Zr < x > I < 2 > Br; the composite protection layer is a composite layer of graphene and PMMA. The preparation method comprises the steps of substrate treatment, sequential preparation of the functional layers and the like, wherein the perovskite layer adopts a gradient annealing process. Perovskite phase transformation is inhibited through zirconium doping, the composite protection layer blocks water vapor erosion, the stability of the device is synergistically improved, the efficiency retention rate still reaches 90% or above after the device is aged for 1000 h under the relative humidity of 85 DEG C / 85%, and meanwhile, the initial photoelectric conversion efficiency of 15.8%-16.5% is kept.

Provided are: a spherical calcium titanate powder which has excellent filling properties in a resin and is capable of achieving a higher relative dielectric constant and a low dielectric loss tangent; a method for producing the spherical calcium titanate powder; and a resin composition containing the spherical calcium titanate powder. The average particle diameter (D50) of the spherical calcium titanate powder is 0.5-15 [mu] m, and the proportion of particles having a particle diameter 0.2 times the average particle diameter (D50) is 1.5 vol% or less; wherein the average particle diameter (D50) is calculated from a particle size distribution obtained by laser diffraction / scattering particle size distribution measurement. The method for producing the spherical calcium titanate powder includes spheroidizing a raw material calcium titanate powder, and heating the spheroidized calcium titanate powder at 600-1200 DEG C.

The invention discloses a novel rotary kiln ceramic lining for calcining a lithium battery positive electrode material and a preparation method of the novel rotary kiln ceramic lining, and relates to the field of new energy and ceramics. The ceramic lining takes at least one of calcium titanate, strontium titanate, barium titanate, calcium zirconate, strontium zirconate and barium zirconate as a main body material, and is prepared from at least one of calcium oxide, strontium oxide, barium oxide or a precursor thereof, and zirconium dioxide or titanium dioxide. The preparation method comprises the following steps: mixing the raw materials and the binder, drying, crushing and sieving; performing compression molding on the materials; calcining the green body to directly obtain the ceramic lining or calcining the green body to obtain a pre-sintered material, and preparing the ceramic lining from the pre-sintered material. The ceramic lining prepared by the invention has extremely low porosity, and can effectively prevent the positive electrode material precursor from permeating into the ceramic lining. The ceramic lining is not easy to react with the positive electrode material, has excellent erosion resistance, and can be used as a rotary kiln lining for calcining the positive electrode material of the lithium battery.

An over-voltage protection device includes a substrate, a voltage variable material, and an electrode set. A recess is formed on the surface of the substrate, and the voltage variable material is disposed in the recess. The voltage variable material includes an insulated metal material, a perovskite-based compound, and a silicone-containing resin. The perovskite-based compound is selected from the group consisting of calcium titanate, strontium titanate, barium titanate, and combinations thereof. The total volume of the voltage variable material is taken as 100%, and the perovskite-based compound accounts for 0.5% to 4.5%. The electrode set includes a first electrode and a second electrode respectively connected to two terminals of the voltage variable material.

The invention relates to a calcium bismuth titanate piezoelectric ceramic with a high piezoelectric constant and a piezoelectric voltage constant and a preparation method of the calcium bismuth titanate piezoelectric ceramic. The chemical composition of the bismuth calcium titanate piezoelectric ceramic is Ca < 0.94 > Bi < 4.06 > Ti < 4 > O < 15-x > wt% MgO, x represents the mass percent of MgO in a Ca < 0.94 > Bi < 4.06 > Ti < 4 > O < 15 > matrix, and x is greater than 0 and less than or equal to 0.3. The Ca0. 94Bi4. 06Ti4O15 component with good piezoelectric property is taken as a matrix, and MgO with low dielectric constant is added, so that the dielectric constant of the calcium bismuth titanate-based high-temperature piezoelectric ceramic is regulated and controlled; meanwhile, a built-in electric field can be established when the free moving charges are polarized, so that the polarization intensity is enhanced, and the piezoelectric property is improved.

Disclosed is a method for preparing porous adsorbent material (22), the method comprising providing a mixture of metakaolin (10) and calcium titanate (12, CaTiO3), mixing the mixture with alkali solution (14) and reacting to obtain alkali-activated modified material (16), providing oil comprising oleic acid (18) as a foaming agent to the alkali-activated modified material (16), and providing hydrogen peroxide (20) as a foaming agent to the alkali-activated modified material (16), and allowing the alkali-activated modified material to foam in the presence of the hydrogen peroxide to obtain porous adsorbent material (22) comprising alkali-activated titanate-modified metakaolin. Also disclosed is porous adsorbent material comprising alkali-activated titanate-modified metakaolin, a flow- through column (24) comprising the porous adsorbent material and system for treating contaminated water.

Provided are: a spherical calcium titanate powder which has excellent resin filling properties, has a higher relative dielectric constant, has little increase in the dielectric loss tangent over time, and is capable of maintaining a low dielectric loss tangent for a long period of time; and a resin composition containing the same. The spherical calcium titanate powder according to the present invention has a ratio ((b) / (a)) of 1.02-1.26, said ratio being between the peak intensity (b) at a wavenumber of 3505 cm-1 and the average value (a) of the peak intensity at a wavenumber of 3495 cm-1 and the peak intensity at a wavenumber of 3515 cm-1, said peak intensity (b) at a wavenumber of 3505 cm-1 being measured by diffuse reflection Fourier transform infrared spectroscopy (FT-IR).

According to the petal-shaped copper calcium titanate nano material and the preparation method thereof, TiO2 nano flowers are prepared through a hydrothermal method, the TiO2 nano flowers are used as a template and subjected to a hydrothermal reaction with a calcium source and a copper source, and the petal-shaped copper calcium titanate nano material is obtained. The surface of the prepared copper calcium titanate is subjected to secondary modification, on one hand, dielectric mismatch is relieved through a dielectric constant gradient established through modification, and electric field distortion is homogenized; on the other hand, the compatibility between the CCTONF and a polymer matrix is improved, and the interface defects of the CCTONF and the polymer matrix are reduced; finally, the prepared composite dielectric film is subjected to thermal stretching, secondary dispersion of the filler is achieved, distribution of the filler in a polymer matrix is homogenized, and the performance of the composite material is further improved. According to the method, the petal-shaped copper calcium titanate nanocluster is synthesized for the first time, the preparation process is simple, the cost is low, pollution is avoided, and the dielectric constant and the energy storage density of polyarylene ether nitrile can be effectively improved.