8 results about "Barium zirconate" patented technology

The invention discloses a heat treatment method of high-polarization-intensity bismuth ferrite-lead titanate-barium zirconate titanate based ferroelectric ceramic, which comprises the following steps: arranging an electrode on the surface of a bismuth ferrite-lead titanate-barium zirconate titanate based ferroelectric ceramic sintered body, and then putting the sintered body into a rapid annealing furnace; the preparation method comprises the following steps: heating to 550-650 DEG C from room temperature at a heating rate of 5-80 DEG C / s, carrying out heat preservation for 45-75 seconds, carrying out first rapid annealing, and cooling to room temperature at a cooling rate of 250-350 DEG C / s, thereby obtaining the bismuth ferrite-lead titanate-barium zirconate titanate based ferroelectric ceramic. The heat treatment method provided by the invention can rearrange defects in the ceramic, increase domain conversion switches, improve the performance of the ceramic, and improve the performance of the ceramic. Furthermore, the ferroelectric piezoelectric property of the polarized BF-PT-BZT ceramic is greatly improved, and meanwhile, the polarized BF-PT-BZT ceramic has high Curie temperature.

This invention belongs to the field of printed circuit board manufacturing, specifically relating to a nano-graphite shadowing reagent for FPCs and its preparation method. The reagent is prepared by first synthesizing cerium-doped yttrium molybdate complexed nanocages and sulfonic acid-functionalized silica-coated barium zirconate core-shell nanoparticles. The former forms a hollow cage structure via a hydrothermal method guided by sodium citrate; the latter forms a core-shell structure through co-precipitation, calcination, and sol-gel methods, and is ultimately oxidized and grafted with sulfonic acid groups. In preparing the shadowing reagent, a premixed solution containing barium zirconate core-shell particles is dispersed with nano-graphite, and then a yttrium molybdate nanocage suspension is introduced. Under alkaline heating conditions, both particles bind to the graphite sheets through electrostatic and coordination interactions, constructing a stable three-dimensional inorganic network. This method significantly improves the reagent's dispersion stability, adhesion to pore walls, and uniform coverage of high aspect ratio micropores, ultimately forming a high-performance conductive colloid suitable for high-reliability via metallization processes in flexible circuit boards.

The invention relates to the field of green special refractory ceramics, and particularly discloses an ultralow-carbon aluminum zirconium barium magnesium converter sliding plate and a preparation process thereof. The ultralow-carbon aluminum-zirconium-barium-magnesium converter sliding plate comprises the following raw material components in parts by weight: 60-80 parts of a main material; 1-3 parts of nano magnesium oxide; 4-8 parts of magnesium oxide; 20 to 30 parts of zirconium oxide; 1-4 parts of a sintering agent; 3-6 parts of a binding agent; the main materials comprise barium hexaaluminate and barium zirconate; the preparation method comprises the following steps: S1, mixing to obtain a mixture; and S2, the mixture is subjected to firing, oil immersion, baking and cold machining in the oxygen atmosphere, and the ultra-low-carbon aluminum zirconium barium magnesium converter sliding plate is obtained. The ultralow-carbon aluminum-zirconium-barium-magnesium converter sliding plate almost does not contain any carbon element, the oxidation resistance is excellent, the cleanliness of molten steel is effectively improved, and the thermal shock resistance and the crack propagation resistance of the ultralow-carbon aluminum-zirconium-barium-magnesium converter sliding plate are obviously improved through the synergistic effect of all the components.

The invention belongs to the field of printed circuit board manufacturing, and particularly relates to a nano-graphite black shadow reagent for an FPC (flexible printed circuit) and a preparation method of the nano-graphite black shadow reagent, and the preparation method of the nano-graphite black shadow reagent comprises the following steps: firstly, synthesizing cerium-doped yttrium molybdate complex nanocages and sulfo-functionalized silicon dioxide coated nano barium zirconate core-shell particles; the hollow cage-shaped structure is formed by guiding sodium citrate through a hydrothermal method; and the latter forms a core-shell structure through coprecipitation, calcination and a sol-gel method, and is finally oxidized and grafted with sulfonic acid groups. When the black shadow reagent is prepared, a premixed solution containing barium zirconate core-shell particles and nano-graphite are dispersed, then yttrium molybdate nano-cage suspension liquid is introduced, and under the alkaline heating condition, the premixed solution and the nano-graphite are combined with a graphite sheet layer through electrostatic and coordination effects, so that a stable three-dimensional inorganic network is constructed. According to the method, the dispersion stability of the reagent, the binding force of the reagent and the hole wall and the covering uniformity of the reagent on the micropores with the high depth-diameter ratio are remarkably improved, the conductive colloid with excellent performance is finally formed, and the method is suitable for a high-reliability hole metallization process of a flexible circuit board.

The invention provides a high-performance high-voltage ceramic capacitor and a manufacturing process thereof, and relates to the technical field of electronic materials, and the capacitor comprises a ceramic dielectric layer and an electrode layer with an innovative structure. The ceramic dielectric layer is composed of barium titanate, barium zirconate, yttrium oxide and niobium pentoxide with specific purity and particle size distribution, and a nanoscale additive is introduced. The electrode layer realizes hierarchical alternate deposition of copper and nickel chromium at the scale of 10nm through magnetron sputtering, and is of a multi-layer gradient structure. The manufacturing process is accurately controlled and comprises the links of batching, ball-milling mixing, ultrasonic dispersion, forming, sintering, pulse annealing, performance testing and the like. By optimizing the materials and the process, the dielectric property, the voltage resistance, the conductivity and the corrosion resistance of the capacitor are remarkably improved, and the stable and consistent product quality is ensured. The performance test system is strict and comprehensive, can meet the strict requirements of modern electronic equipment, and has a wide application prospect in the field of electronics.

This application discloses a method for preparing a liquid crystal polymer composite film and the liquid crystal polymer composite film itself. The preparation method includes: dissolving soluble liquid crystal polymer particles in a first solvent and stirring to obtain a soluble liquid crystal polymer solution; mixing the soluble liquid crystal polymer solution, filler micropowder, and additives to obtain a first mixture; dispersing and degassing the first mixture to obtain a slurry; the filler micropowder includes at least one of titanium dioxide, barium titanate, barium zirconate, lead titanate, calcium zirconate, calcium titanate, carbon nanotubes, graphene oxide, and reduced graphene; coating the slurry onto a substrate to form a wet film on the substrate; drying and curing the wet film to obtain a first film; and peeling the first film off the substrate to obtain the liquid crystal polymer composite film. In this application, the filler micropowder and the liquid crystal polymer matrix work synergistically to achieve a high dielectric constant while maintaining low loss. It is also less prone to breakage or deformation under external forces.

A piezoelectric ceramic of the present disclosure contains, in potassium sodium niobate, at least one selected from the group consisting of strontium zirconate, barium zirconate, strontium titanate, and barium titanate. A piezoelectric element of the present disclosure includes a pair of electrodes on one surface of the piezoelectric ceramic and on the other surface located opposite to the one surface.

This invention relates to a low thermal expansion and high thermal shock barium zirconate composite ceramic and its preparation method. The technical solution is as follows: Barium zirconate powder and ethanol are ground and dried to obtain barium zirconate powder; the barium zirconate powder is mixed with a lanthanum compound, ball-milled, and the ball-milled mixture is dried and granulated, machine-pressed, and then isostatically pressed to obtain a ceramic green body; the isostatic pressing process involves five pressure increases: the pressures of the five pressure increases are 25–35 MPa, 40–70 MPa, 80–100 MPa, 110–130 MPa, 140–200 MPa, and 140–200 MPa, respectively, and the pressure is maintained at 140–200 MPa; the ceramic green body is heated at different rates to 980–1020℃, 1290–1310℃, 1490–1510℃, and 1550–1650℃, respectively, and held at 1550–1650℃ for 1–6 hours to obtain a low-expansion, high-thermal-shock barium zirconate composite ceramic. The present invention features low sintering temperature and low carbon emissions, and the resulting products have low bulk density, high apparent porosity, low coefficient of thermal expansion, and good thermal shock resistance.