23 results about "Batio3 ceramics" patented technology

The invention provides a Joule heat ultrafast sintering preparation method of barium titanate ceramic with ultrahigh dielectric constant and low loss, which comprises the following steps: ball-milling and mixing barium titanate powder and copper oxide powder, drying, pressing into a cake-shaped sample, carrying out cold isostatic pressing to obtain a sample piece, and carrying out vacuum treatment on Joule heat ultrafast sintering equipment to obtain the barium titanate ceramic with ultrahigh dielectric constant and low loss. Putting the sample preparation sheet between two layers of graphite felts, and starting Joule heat ultrafast sintering equipment to enable the graphite felts to generate Joule heat, so as to realize short-time sintering of the barium titanate ceramic. According to the invention, a Joule heat ultrafast sintering technology is adopted, and Joule heat is generated by directly applying voltage and current to the graphite felt, so that the sintering time is greatly shortened, and environmental pollution is avoided; meanwhile, the dielectric constant of the barium titanate ceramic is greatly improved by adding copper oxide, and the energy consumption is remarkably reduced.

This application relates to the field of electrochemical technology, specifically to polyester composite films and their preparation methods, composite current collectors and their preparation methods, electrodes and their applications. The polyester composite film of this application comprises: a polyester substrate layer and a first surface layer and a second surface layer respectively disposed on opposite sides of the polyester substrate layer; the polyester substrate layer comprises, by weight, 90 to 99 parts of polyester material and 1 to 10 parts of photo-straining material; the first and second surface layers comprise polyethylene terephthalate polymers; the transmittance of the first surface layer, the second surface layer, and the polyester material is independently 92% to 99%; the photo-straining material comprises one or more of barium titanate ceramics, lead zirconate titanate ceramics, PI / CNTs photosensitive composite materials, PEEK / anthraquinone photosensitive composite materials, MIL-101 chromium metal-organic frameworks, and UiO-66-NH2 / ZnO composite materials. The polyester composite film can easily break under high-destructive external forces such as battery breakdown and battery collision, effectively suppressing thermal runaway.

The invention relates to the technical field of barium titanate-based ceramic preparation, in particular to a rare earth ion doped barium titanate-based ceramic material and a preparation method thereof.High-purity tetragonal-phase barium titanate is prepared through a hydrothermal synthesis process, doped ions comprise two rare earth ion elements including europium and dysprosium, and one or more of sodium, magnesium, bismuth, niobium, cobalt, lanthanum and the like are cooperatively doped; barium titanate powder and ion-doped oxide powder are mixed according to a certain proportion, and the ion-doped barium titanate ceramic is prepared through solid-phase sintering. By adopting the formula and the preparation method disclosed by the invention, a barium titanate-based ceramic capacitor product with excellent dielectric property, high stability and low loss can be obtained, and the preparation method is suitable for preparing a high-temperature and high-performance multilayer ceramic capacitor.

This invention discloses a method for controlling the oxygen partial pressure and performance of barium titanate ceramics during sintering using coconut shells, comprising the following steps: Step 1: Select coconut shells, clean them, remove the fibers, and dehydrate and dry them using a high-temperature forced-air drying oven; Step 2: Crush the dried coconut shells into small pieces, place them in a crucible, and carbonize them at high temperature in a muffle furnace; Step 3: Take out the high-temperature carbonized coconut shell char, grind it, and sieve it; Step 4: Weigh the coconut shell char and barium titanate powder at a mass ratio of 2~6:100, and then grind them to fully mix the coconut shell char and barium titanate powder; Step 5: Add a binder to the mixed powder, grind it thoroughly, and then press the powder into sheets to obtain a green body of fully mixed coconut shell char and barium titanate; Step 6: Place the pressed green body into a muffle furnace and sinter it at high temperature; Step 7: Obtain the coconut shell char mixed barium titanate ceramic.

The application discloses a preparation method of a niobium-doped barium titanate ceramic material with improved flexoelectric performance, and relates to the field of functional materials. The preparation method comprises the following steps: (1) preparing a niobium-doped barium titanate powder by ball-milling and mixing high-purity barium titanate powder and niobium oxide powder and then solid-phase sintering; (2) preparing a to-be-used embryo by using the powder; (3) performing traditional sintering on the to-be-used embryo to obtain a niobium-doped barium titanate ceramic; and (4) performing flexoelectric performance testing on the niobium-doped barium titanate ceramic, wherein the flexoelectric coefficient of the niobium-doped barium titanate ceramic is 23-380 muC / m, and the flexoelectric coefficient of the component with the optimal flexoelectric performance is 20 times higher than that of a pure barium titanate ceramic.

A method for improving the electrocaloric effect of ferroelectric perovskite material, by weighing Ba source, Sr source, Ca source, Hf source, Sn source, Zr source, Ti source and mixing uniformly according to stoichiometric ratio, pre-sintering to obtain (Ba x Sr y Ca z A 1‑x‑y‑z )(Hf a Sn b Zr c Ti d B 1‑a‑b‑c‑d )O3 powder; after fine grinding and mixing with binder, granulation, shaping, aging, plastic removal treatment to obtain ceramic green body; finally, through sintering, high electrocaloric performance barium titanate-based ferroelectric perovskite electrocaloric material is obtained, the application takes barium titanate ceramic as matrix, introduces zirconium, hafnium, tin, strontium, calcium and other element precursors during synthesis by solid phase method, simultaneously substitutes BaTiO3 material at A and B positions with multi-element doping, after blending, high temperature sintering to obtain finished product. The method has simple preparation condition, mature process, low cost and high reliability. Under the induction of electric field, great entropy change and electrocaloric effect are generated.

The invention relates to a wafer-type barium titanate ceramic capacitor dielectric material and a preparation method and application thereof, and the preparation method comprises the steps: uniformly mixing barium titanate-based mixed powder and stearate, pressing, and sintering to obtain the wafer-type barium titanate ceramic capacitor dielectric material, the raw materials of the barium titanate-based mixed powder comprise barium titanate, rare earth oxide and a silica sol solution. The stearate is used as an internal release agent to solve the problem of large release resistance in the subsequent pressing process due to the fact that silica sol liquid is used for replacing an organic binder to produce the wafer ceramic, and is also used as a doping source, and metal carbonate obtained in the subsequent heat treatment process is firstly filled in gaps of barium titanate particles to reduce the internal porosity of a green body; gaps of barium titanate particles are further filled with trace high-activity metal oxide obtained through further heat treatment, the surfaces of the barium titanate particles are wrapped with a vitreous liquid phase formed by silicon dioxide, then the dielectric constant is increased, the performance stability is improved, and the yield is remarkably increased.

The application discloses a kind of low dielectric ultra-low loss high temperature stability neodymium oxide and zinc niobate co-doped barium titanate ceramic and preparation method.The general formula of the ceramic material is (1-x) BaTiO3-xZnNb2O6-xNd2O3, wherein x is 0.1-0.2, and is prepared by traditional solid-phase sintering method, with simple process, good repeatability and high yield.The application introduces Zn 2+ , Nb 5+ And Nd 3+ A / B site collaborative doping is carried out in BaTiO3 matrix, so that the obtained ceramic material realizes excellent comprehensive performance in the range of x=0.145-0.155 while maintaining moderate dielectric constant: extremely low dielectric loss (tanδ≤0.001), excellent temperature stability (ΔC / C 20°C ≤±0.5%, -150-250°C) and high breakdown field strength (E b ≥280kV / cm).The ceramic material is suitable for scenes with strict requirements on dielectric properties, temperature stability and breakdown field strength, and can be applied in fields such as aerospace extreme environment electronic components, new energy vehicle power modules and precision high-frequency sensing equipment, with significant application value and market potential.

This invention discloses a low-dielectric-value, ultra-low-loss, high-temperature-stability barium titanate and zinc niobate co-doped barium titanate ceramic, and its preparation method. The ceramic material has the general formula 0.85BaTiO3-0.15ZnNb2O6-xDy2O3, where x ranges from 0.008 to 0.02. It is prepared using a traditional solid-state sintering method, which is simple, reproducible, and has a high yield. This invention introduces Zn into the BaTiO3 matrix. 2+ 、Nb 5+ and Dy 3+ Multi-doping was performed to achieve lattice manipulation and defect engineering in the BaTiO3 matrix. When x=0.15, the resulting ceramic material maintained a suitable dielectric constant. e r While achieving a dielectric loss of 138, it also achieves excellent overall performance: extremely low dielectric loss (tanδ=0.0002, 1kHz), and excellent temperature stability (Δδ). C / C 20°C With a voltage rating of ≤ ±0.5% (-150~200°C) and a high breakdown field strength of 330kV / cm, these performance indicators fully meet the highest standards of the new NPO type ceramic capacitors, and have significant application value and market prospects in high-end fields such as microwave communication, automotive electronics and aerospace.

The application provides a ceramic dielectric material and a preparation method and application thereof, a main body material of the material is BaTiO3, doping materials include SiO2, CaO, V2O5, ZrO2 and oxides of rare earth elements; the oxides of the rare earth elements include at least two of Sc2O3, Sm2O3, Dy2O3 and Ho2O3; the addition amount of BaTiO3 is 93.5-95 mol% in terms of molar percentage; the total addition amount of the doping materials is 4.6-7 mol%. The application takes BaTiO3 as the main body material, takes sintering aids, metal oxides and rare earth elements as composite dopants, modifies a barium titanate ceramic base, adds sintering aids and doping materials to refine particles, controls defects and improves the uniformity of the grain size, and prepares fine-grain ceramic and multilayer ceramic capacitors with high reliability, stable capacitance characteristics and more easy lamination.

The invention discloses light-cured piezoelectric ceramic slurry and a preparation method and application thereof.According to the light-cured piezoelectric ceramic slurry, two-functional-group aliphatic polyurethane acrylate, hexanediol diacrylate and trimethylolpropane triacrylate are compounded, a phosphate hyperdispersant is combined, firm chemical anchoring can be formed with modified barium titanate, and the piezoelectric ceramic slurry can be applied to light-cured piezoelectric ceramics. In addition, a curing system composed of low-viscosity active monomer hexanediol diacrylate, high-crosslinking-density trimethylolpropane triacrylate and a visible light initiator is adopted, the curing system is matched with the light absorption characteristic of modified barium titanate, and therefore the light absorption property of the modified barium titanate is improved. And enough penetration depth and interlayer binding force are ensured. A DLP technology is adopted to accurately print a ceramic green body framework at one time, a barium titanate ceramic framework with a complete structure and high density is obtained after degreasing and sintering, the 3-3 type piezoelectric composite material with controllable precision is prepared, the reflection loss of sound waves is reduced, and the quality of the material is further ensured.

This invention relates to electrode pastes, preparation methods, and components for PTC thermistors. It belongs to the field of electronic paste technology and aims to overcome the shortcomings of existing technologies. The paste provided by this invention is prepared from metal powder, glass powder, inorganic additives, organic additives, and resin. The metal powder includes copper-nickel alloy powder and pure copper powder. This technical solution effectively inhibits the diffusion of copper atoms into the barium titanate ceramic matrix, ensuring that the resistance value of the ceramic matrix after sintering differs from the original value by within ±2.0%, achieving stable and sufficient ohmic contact while avoiding the deterioration of the matrix's resistance. It also exhibits excellent solderability and high adhesion strength.

The application provides a barium titanate ceramic powder and a preparation method and application thereof, and belongs to the technical field of material preparation. The method comprises the following steps: mixing a barium chloride aqueous solution and a titanium chloride-containing solution, mixing the mixed solution with an organic acid solution, mixing the mixed sol solution with a surfactant solution, stirring and reacting, and sequentially performing centrifugation, drying, calcination and crushing on the stirring reaction product to obtain the barium titanate ceramic powder. Compared with the prior art, the application has the advantages that the simple co-precipitation preparation process is easy to operate and realize, the cost is low, no additional complex conditions and complex equipment are needed, the co-precipitation reaction can occur under stirring at normal temperature and pressure, the raw materials used are cheap and easy to obtain, the material preparation cost is relatively low, the particles are pure tetragonal phase crystal structures, the particle size is small, the prepared barium titanate is easy to process and sinter, and therefore the barium titanate can be used for manufacturing electronic ceramic devices, filter ceramic devices and various purposes.

This invention relates to a fine-grained barium titanate ceramic dielectric material coated with bismuth borosilicate glass and its preparation method. A bismuth borosilicate glass sol is prepared using a sol-gel method, wherein the bismuth borosilicate glass is a Bi₂O₃-B₂O₃-SiO₂ glass. BaTiO₃ powder is dispersed in the bismuth borosilicate glass sol to obtain bismuth borosilicate glass sol-coated BaTiO₃ powder. The bismuth borosilicate glass-coated BaTiO₃ powder is calcined to obtain fine-grained barium titanate ceramic powder coated with bismuth borosilicate glass. The fine-grained barium titanate ceramic powder coated with bismuth borosilicate glass is granulated and shaped to obtain a barium titanate ceramic green body. Heating further yields a fine-grained barium titanate dielectric ceramic, which is the fine-grained barium titanate ceramic dielectric material coated with bismuth borosilicate glass. Compared with the prior art, the present invention prepares glass-coated BaTiO3 powder to form a core-shell structure powder by sol-gel method. This core-shell structure powder of glass-coated BaTiO3 powder is used for the preparation of fine-grained barium titanate ceramics and can be widely used in the field of electronic materials applications.

The invention discloses a barium titanate ceramic capacitor material and a preparation method thereof, the composition of the barium titanate ceramic capacitor material is represented as (1-a-b-c-d-e) BaTiO3-aNb2O5-bGd2O3-cB2O3-dSiO2-eMn3O4, a = 0.008-0.012, b = 0.002-0.005, c = 0.001-0.004, d = 0.001-0.004, and e = 0.002-0.004, the preparation method comprises the following steps: (1) mixing Nb2O5, Gd2O3, B2O3, SiO2 and Mn3O4 according to a ratio, carrying out mixing, ball milling and sieving, and then carrying out first sintering treatment; (2) adding BaTiO3 into the material prepared in the step (1), mixing and ball-milling, and drying; and (3) carrying out compression molding on the material obtained in the step (2), and then carrying out secondary sintering treatment. The barium titanate ceramic capacitor material disclosed by the invention realizes low loss and high temperature stability while keeping relatively high dielectric.

The invention provides a preparation method of a one-dimensional double-doped barium titanate ceramic filler PVDF-based composite material, and belongs to the technical field of dielectric materials. The preparation method comprises the following steps: uniformly mixing tetrabutyl titanate, zirconium acetylacetonate and an organic solvent to form a solution A, and uniformly mixing barium acetate, strontium acetate and deionized water to form a solution B; slowly adding the solution B into the solution A, carrying out a reaction step by step, and aging after the reaction is finished to obtain a wet gel-like ceramic precursor; thickening the ceramic precursor, and then performing electrostatic spinning to obtain a nanofiber membrane; calcining the nanofiber membrane, and then scattering the nanofiber membrane into nanorods; and mixing the nanorod and PVDF in an organic solvent, dispersing into a suspension, heating and stirring, and carrying out curtain coating and hot pressing to obtain the composite material. The composite material disclosed by the invention has relatively high comprehensive performance and has an important application prospect in the field of energy storage.

This invention relates to a barium titanate high-pressure ceramic material, its solid-state sintering preparation method, and its application. The solid-state sintering preparation method includes: mixing barium titanate powder and auxiliary powder, and then sintering the resulting mixed powder to obtain the barium titanate high-pressure ceramic material. The auxiliary powder comprises strontium carbonate and titanium dioxide in a molar ratio of 0.8:1 to 1.2:1; the molar ratio of barium titanate powder to auxiliary powder is 5:1 to 10:1. This invention improves the dielectric properties and high-voltage resistance of barium titanate ceramics under high-voltage environments using only simple auxiliary materials. Moreover, the solid-state sintering preparation method provided by this invention is simple and easy to implement, enabling the industrial-scale production of barium titanate high-pressure ceramic materials.

A method for improving the electrocaloric effect of a ferroelectric perovskite material, comprising: weighing Ba, Sr, Ca, Hf, Sn, Zr, and Ti sources and mixing same uniformly according to a stoichiometric ratio; performing pre-sintering to obtain (BaxSryCazA1-x-y-z)(Hf aSn bZrcTidB1-a-b-c-d)O3 powder; after fine grinding and mixing with a binder, granulating the mixture, followed by forming, aging, and de-plasticizing to obtain a ceramic green body; and finally performing sintering to obtain a barium titanate-based ferroelectric perovskite electrocaloric material having high electrocaloric performance. In the present invention, barium titanate ceramic is used as a matrix, and elemental precursors such as zirconium, hafnium, tin, strontium, and calcium are introduced during solid-phase synthesis, and multi-element doping is performed at both the A-site and B-site to substitute into the BaTiO3 material. After blending and high-temperature sintering, the finished product is obtained. The method features simple preparation conditions, mature processes, low costs, and high reliability. Under the induction of an electrical field, a large entropy change and strong electrocaloric effect are generated.

The application discloses A and B site doped BaTiO3-based dielectric ceramic, characterized in that the chemical formula of the A and B site doped BaTiO3-based dielectric ceramic is (Ba x1 Ca x2 Sr 1‑x1‑x2 )(Ti 0.4 La 0.2 Ce 0.2 Ta 0.2 )O3, 0≤x1≤1, 0≤x2≤1, and x1+x2≤1. The application also discloses a preparation method thereof. The application introduces other elements into A and B of the barium titanate ceramic dielectric material, improves the high-temperature stability and energy storage performance, and overcomes the defects of poor temperature stability and low energy storage efficiency of the existing barium titanate ceramic dielectric material.

The application discloses a bismuth ferrite-barium titanate ceramic with temperature stability of piezoelectric coefficient and a preparation method thereof. 1‑ x Ce x TiO3+ywt.%MnO2, wherein 0<=x<=0.05, 0<y<=0.5. The bismuth ferrite-barium titanate ceramic provided by the application selects Ce 4+ performs "donor" doping, replaces Ba 2+ and introduces excess free positive charges (holes), and the positive charges can compensate for Fe 3+ reduced into Fe 2+ formed positive oxygen vacancies, thereby inhibiting the generation of oxygen vacancies, and in combination with rapid quenching, the piezoelectric coefficient of the bismuth ferrite-barium titanate ceramic is kept stable within a certain temperature range, and the temperature stability of the piezoelectric performance is improved.

This invention discloses the composition and preparation of an aluminum electrode for a positive temperature coefficient thermistor, belonging to the field of chemical preparation. The aluminum electrode paste is composed of near-spherical aluminum powder, lead-free environmentally friendly glass powder, organic binder, and protective additives. By optimizing the lead-free glass component, the surface protective film of the aluminum powder is prevented from being eroded, thus preventing oxidation and detachment. The aluminum electrode is formed on a barium titanate ceramic substrate through screen printing and sintering at 580–630℃, achieving good ohmic contact with the substrate. The electrode is firmly attached, oxidation-resistant, does not detach, has a small resistance change rate, and exhibits superior corrosion resistance and weather resistance compared to traditional lead-containing aluminum paste. It is suitable for mid-to-high-end PTC thermistors and applications in energy storage and new energy sectors. This invention solves the problems of easy detachment and poor reliability of existing lead-free aluminum pastes, significantly improving component lifespan and stability.

The invention discloses a barium titanate ceramic sintering method, and relates to the field of ceramic material preparation, a room temperature rapid sintering device is built, a novel carbon electrode structure is used, direct current voltage is applied to a large-diameter and large-thickness barium titanate wafer green body, and barium titanate is rapidly sintered under the heat effect of current at room temperature. The shape and the size of the barium titanate ceramic sample adapt to actual application scenes. Compared with a traditional barium titanate ceramic sintering method, the room-temperature rapid sintering method has the advantages that the device structure is simple, the requirements on a power supply and the environment are low, and the performance of the sample can be optimized. According to the invention, the room-temperature rapid sintering of the barium titanate ceramic is realized, the sintering time is shortened, the energy efficiency is improved, the application field of the room-temperature rapid sintering method is further expanded, and the feasibility of the room-temperature rapid sintering method in industrial production application is proved.