7 results about "Tantalate" patented technology

The application discloses a potassium fluorotantalate crystallization purification method, and relates to the technical field of tantalum hydrometallurgy and fluorotantalate crystallization purification. The method comprises the following steps: filtering a tantalum-containing fluorine acid solution, adding a potassium source and a tantalum-niobium separation type composite crystallization regulator, stirring and complexing, seed induction, controlled cooling crystallization, graded removal of the regulator, solid-liquid separation, and potassium fluoride containing fluorine acid washing to obtain primary purified potassium fluorotantalate crystals, and then redissolving the primary purified potassium fluorotantalate crystals in a fluorine-containing acid solution, correcting the K / Ta molar ratio, repeatedly regulating and crystallizing, graded removal of the regulator, washing, and drying to obtain high-purity potassium fluorotantalate. The regulator can reduce the entrainment of niobium impurities and reduce the residual amount of the regulator itself, thereby improving the purity of the product and the Ta yield.

This application provides an in-situ grown needle-like blend of GdTaO4 / Sm-CeO2 radiation-resistant and antibacterial particles, its preparation method, and its application, relating to the fields of radiation protection materials and antibacterial materials. The radiation-resistant and antibacterial particles of this application use needle-like gadolinium tantalate as the radiation shielding matrix. A sheet-like samarium-doped cerium dioxide antibacterial component is uniformly grown on its surface using a hydrothermal in-situ growth method, resulting in a dual-functional composite material with an integrated needle-sheet blend structure. This application achieves strong interfacial bonding between the two phases through rare-earth lattice matching, while in-situ growth solves the core problem of easy agglomeration in physically blended powders. The resulting composite material possesses both radiation protection (X-rays + thermal neutrons) and highly efficient antibacterial functions. It exhibits controllable crystallization, strong batch stability, good compatibility with various matrices, stable structure, and uniform dispersion. It can be directly used as a functional filler or further processed into molds. The resulting products can be applied in fields such as nuclear industry protection, radiation medical dressings, military protective equipment, and civilian antibacterial and radiation-resistant products.

Apparatus and methods for growing films of complex layered metal oxides with high stoichiometries and high crystal qualities are provided. The layered complex metal oxides include two or more metals and oxygen and have a layered structure. The methods, which are referred to as hybrid pulsed laser deposition (hybrid PLD), synergistically combine the advantages of molecular beam epitaxy (MBE) and pulsed laser deposition (PLD) to grow complex metal oxide films that include metals with very different vapor pressures.

This invention discloses a method for preparing low-oxygen, high-specific-capacitance tantalum powder for tantalum capacitors, addressing the problems commonly found in existing magnesothermic reduction methods for tantalum powder preparation, such as high oxygen content, difficulty in suppressing the byproduct magnesium tantalate, and poor powder particle uniformity leading to low specific capacitance, high leakage current, and poor electrical performance. This method involves uniformly coating a completely removable soluble additive onto the surface of porous spherical tantalum oxide particles. After drying, these particles are mixed with alkali metal halides and a single-phase addition of metallic magnesium powder. A gradient-temperature reduction process is employed: in the intermediate temperature stage, the additive decomposes to construct a porous framework and initiates initial reduction; in the high-temperature stage, deep reduction is completed. A molten salt medium synergistically regulates the heat of reaction and mass transfer, completely suppressing the formation of magnesium tantalate. The product, after post-treatment, yields tantalum powder with an oxygen content ≤2500 ppm, a specific capacitance ≥110000 μFV / g, and a uniform coral-like porous structure. This method offers a clean and highly controllable process, resulting in high-purity tantalum powder with excellent electrical properties, making it suitable for high-end tantalum electrolytic capacitors.

The application relates to the technical field of temperature-pressure phase diagram modeling, and discloses a temperature-pressure phase diagram modeling method based on a Grover model, which comprises the following steps: S1: obtaining the thermal expansion coefficient, volume and isothermal bulk modulus thermodynamic data of a rare earth tantalate system under different temperature and pressure conditions; S2: respectively correcting the molar volume and the isothermal compressibility under standard atmospheric pressure, reducing the influence of excessive sensitivity of the heat capacity on the coupling relationship between the temperature and the pressure, so as to realize the correction of the Grover model; and S3: obtaining the Gibbs free energy change through the corrected Grover model state equation, and linearly superimposing the Gibbs free energy change and the Gibbs free energy under standard atmospheric pressure given by a thermodynamic database to obtain a temperature-pressure phase diagram model. The application can ensure the accuracy of the obtained Gibbs free energy, thereby ensuring stable modeling and ensuring the reliability of the phase diagram.

This invention relates to the field of laser protection technology, specifically to a laser protection coating and its preparation method. The laser protection coating comprises a reflective ceramic layer, a heat-insulating ceramic layer, and at least three gradient ceramic layers located between the reflective and heat-insulating ceramic layers. The reflective ceramic layer comprises barium titanate and its doped system, and / or pyrochlore and its doped system; the heat-insulating ceramic layer comprises yttrium-stabilized zirconium oxide and its doped system, and / or rare-earth tantalates and their doped systems. The purpose of this laser protection coating and its preparation method is to address the problem of low optical reflectivity in existing laser-resistant materials.

The application belongs to the technical field of ceramic metal composite materials, and particularly relates to a multiphase ceramic composite plate and a preparation method thereof, and a metal-based ceramic composite lining plate for a ball mill and a preparation method thereof. The composite material comprises, in terms of weight fractions, 70-90 parts of zirconium oxide, 5-10 parts of silicon carbide, 5-10 parts of aluminum oxide, 2-6 parts of titanium dioxide, 2-5 parts of tungsten carbide, 2-4 parts of scandium oxide, 2-4 parts of cobalt oxide, 1-3 parts of potassium tantalate, 1-3 parts of potassium titanate, 1-2 parts of bismuth trioxide, and 1-2 parts of erbium oxide. The dense ceramic plate is obtained through mixing, wet grinding, drying, pressing and high-temperature sintering, and is further broken and screened to form a special-shaped ceramic sheet. The special-shaped sheet is laid in a mold and filled with high-chromium cast iron powder, and is subjected to vibration and high-temperature sintering to form a stable integrated metal-based ceramic composite lining plate. The prepared lining plate has high hardness of ceramic and toughness of metal, and is suitable for high-wear equipment such as a ball mill.