280 results about "Tantalum oxide" patented technology

The invention provides a diaphragm and a preparation method thereof and a lithium ion battery, the diaphragm comprises a base membrane layer and a composite functional layer, the composite functional layer comprises hydrophobic SiO2 aerogel modified by a hydrophobic agent, a conductive ion polymer and a solid electrolyte, and the composite functional layer respectively accounts for 3-12wt%, 0.5-1.0 wt% and 0.5-1.5 wt% of the total mass of the diaphragm; the hydrophobic agent comprises trimethylchlorosilane, hexamethyldisilazane, perfluorooctyltriethoxysilane, polyvinylidene fluoride, polydimethylsiloxane and the like, the conductive ionic polymer comprises polyvinylpyrrolidone, lithium polymethacrylate, lithium polystyrene sulfonate, polyacrylamide and the like, and the solid electrolyte comprises lithium lanthanum titanium oxide, lithium lanthanum zirconium oxide, lithium lanthanum zirconium tantalum oxide and the like. The wettability is improved by the high porosity of the hydrophobic SiO2 aerogel, the stability and strong conductivity of a physical conductive network of the solid electrolyte and the ion affinity and amphoteric binding capacity of the conductive ion polymer are optimized, the electrochemical performance and thermal stability of the interface are optimized, and comprehensive optimization of the thermal-electric-interface performance of the diaphragm is realized through combination.

The invention discloses high-resistance aluminum-magnesium spinel ceramic as well as a preparation method and application thereof, and relates to the technical field of preparation of ceramic materials. The ceramic comprises the following raw materials in parts by weight: 28-32 parts of silicon dioxide, 15-17 parts of magnesium oxide, 38-42 parts of aluminum oxide, 1-3 parts of lanthanum oxide, 2-5 parts of zirconium oxide, 1.5-2.5 parts of calcium oxide, 0.8-1.2 parts of tantalum oxide, 2-4 parts of titanium oxide and 1-3 parts of zinc oxide. The method provided by the invention has the advantages of low energy consumption, high production efficiency, high insulation resistance and the like, and solves the problems of low yield, complex equipment structure, high production cost and the like of the existing preparation method.

The invention discloses a titanium-based-iridium tantalum oxidation coating anode and a preparation method and application thereof, and belongs to the technical field of anode preparation, and the preparation process of the titanium-based-iridium tantalum oxidation coating anode comprises the steps that a titanium substrate is brushed with a solution containing a tantalum source A, then sintering is conducted, brushing-sintering is repeated, and a tantalum-coated titanium substrate is obtained; the tantalum-coated titanium substrate is brushed with the iridium-tantalum oxidation coating liquid, then sintering is carried out, and brushing-sintering is repeated, so that the tantalum-coated titanium substrate is obtained; the iridium-tantalum oxidation coating liquid contains a tantalum source B, an iridium source and a zirconium source; in the iridium tantalum oxidation coating liquid, the mass ratio of tantalum to iridium is (6-7): (4-5), according to the preparation method provided by the invention, through two times of brushing, the tantalum content in the titanium-based-iridium tantalum oxidation coating anode is more than 5% greater than the iridium content, and when the titanium-based-iridium tantalum oxidation coating anode is used for an alkaline citric acid electroplating system, the decomposition of a complexing agent can be effectively inhibited, the components of the electroplating liquid are maintained to be stable, so that the quality of a plating layer is ensured, and the service life of the plating layer is prolonged. The maintenance cost of the plating solution is reduced and the service life is prolonged.

The invention relates to the technical field of battery design and manufacturing processes, in particular to an all-solid-state battery based on a 3D printing technology and a preparation method, and the all-solid-state battery comprises a positive electrode, a negative electrode, a solid electrolyte and a current collector; a positive electrode is composed of lithium cobalt nickel manganese oxide and the like, and a novel conductive agent and a multifunctional modifier are added; the negative electrode is made of a silicon-tin-carbon composite material and the like; the solid electrolyte contains components such as lithium, lanthanum, zirconium, tantalum and oxygen; the current collector is alloy foil and is plated with a specific film, and the material proportion and characteristics of all parts are clear. The unique material formula improves the battery performance, and enhances the energy density and cycle stability; the structure is accurately controlled through the 3D printing technology, and the production efficiency and the battery consistency are improved; the solid electrolyte guarantees safety, reduces hidden dangers, and is beneficial to wide application in multiple fields.

The invention discloses a method for preparing low-oxygen tantalum powder through magnesium reduction. Aiming at the defects of more impurities, non-uniform particles, complex process and the like in the existing tantalum powder preparation technology, the method comprises the following steps: firstly, pretreating tantalum oxide powder and anhydrous calcium chloride, so that tantalum oxide is uniformly coated with calcium chloride; and mixing the pretreated raw materials with magnesium chips, introducing high-purity argon into a closed container for multiple times of replacement, carrying out heating and heat preservation to generate a reaction, separating a product, and then carrying out water washing, acid pickling and drying treatment to obtain the tantalum powder. According to the method, magnesium and tantalum oxide are fully reacted by virtue of heat absorption and fluxing effects of calcium chloride, so that composite substances such as tantalate are prevented from being generated, and impurity introduction is reduced. The oxygen content of the prepared low-oxygen tantalum powder is smaller than 3000 ppm, the apparent density is 1.3-1.5 g / cm < 3 >, powder particles are in a coralline shape and are uniform in size, operation is easy and convenient, the requirement for equipment is low, and the low-oxygen tantalum powder has good application prospects in the field of electronic component manufacturing.

The invention provides a titanium-based ceramic target material and a preparation method and application thereof.The titanium-based ceramic target material is prepared from, by mass, 96.4 wt%-98.3 wt% of titanium oxide and 1.7 wt%-3.6 wt% of doped oxide, and the doped oxide is prepared from, by mass, 0.8 wt%-1.5 wt% of niobium oxide, 0.5 wt%-1.0 wt% of tantalum oxide, 0.3 wt%-0.8 wt% of tungsten oxide and 0.1 wt%-0.3 wt% of aluminum oxide. According to the method, the high-performance titanium-based ceramic target material is prepared by adopting a normal-pressure sintering method through multi-element synergistic doping and dynamic regulation and control of the sintering atmosphere, the titanium-based thin film prepared by sputtering the titanium-based ceramic target material can form a laminated thin film structure with an indium tin oxide (ITO) thin film, and high conductivity, high visible light transmittance and high electron mobility are achieved; and the actual requirements in the field of silicon-based and perovskite solar cells are met.

The invention relates to the technical field of optical films with high damage thresholds, in particular to a tantalum oxide film with a high laser damage threshold under near-infrared long waves and a preparation method thereof, and the preparation method comprises the following steps: cleaning a substrate material by using a strong oxidation inorganic solvent, cleaning by using an organic solvent after cleaning by using deionized water, drying by blowing nitrogen, and drying to obtain the tantalum oxide film with the high laser damage threshold under near-infrared long waves. A clean substrate is obtained; depositing tantalum oxide on a clean substrate to obtain a tantalum oxide deposited substrate; and carrying out rapid annealing on the substrate deposited with tantalum oxide to obtain a substrate plated with tantalum oxide. According to the tantalum oxide thin film with the high laser damage threshold value under the near-infrared long wave and the preparation method of the tantalum oxide thin film, the laser damage threshold value of the tantalum oxide thin film at the near-infrared long wave is effectively improved through rapid annealing, the laser damage threshold value is improved by about 190% compared with an unannealed film layer, and the preparation time is greatly shortened.

The invention relates to the technical field of battery materials, and discloses a composite solid electrolyte diaphragm as well as a preparation method and application thereof. The composite solid electrolyte diaphragm comprises a base membrane and a solid electrolyte coating arranged on at least one surface of the base membrane, the solid electrolyte coating comprises an electrolyte I and an electrolyte II; the electrolyte I is lithium titanium aluminum phosphate and lithium lanthanum zirconium tantalum oxide; and the electrolyte II is a compound of lithium bis (oxalate) borate and acetamide in a molar ratio of 1: (6.5-7.5). The composite solid electrolyte diaphragm provided by the invention can realize relatively high ionic conductivity, and when the composite solid electrolyte diaphragm is used in a lithium ion battery, the battery can have relatively low internal resistance.

The present invention relates to a porous tantalum carbide prepared by a molten salt method and a preparation method and application thereof. In combination with molten salt and solid phase sintering methods, firstly, an excess of molten tantalum precursor powder (such as tantalum oxide, etc.) is used to metallize a porous carbon-based material (such as porous graphite) to form porous tantalum; then, tantalum atoms diffuse and penetrate into the lattice of carbon materials such as graphite by thermal motion to obtain a porous tantalum carbide with high purity and high porosity, but there will be a partial carbon core inside; finally, carbon removal is performed in a heat treatment furnace to obtain a porous tantalum carbide with high purity and high porosity. Compared with the prior art, the porous tantalum carbide manufactured by the present invention has stronger corrosion resistance, can be recycled, has a higher porosity and does not cause void clogging.

The invention belongs to the technical field of development and manufacturing of solid-state electrolyte materials and solid-state lithium batteries, and particularly relates to an all-solid-state oxide-polymer electrolyte membrane as well as a preparation method and application thereof. The electrolyte membrane comprises a polymer matrix, a lithium salt, butanedinitrile, lithium lanthanum zirconium tantalum oxide and graphite phase carbon nitride, the polymer matrix, the lithium salt, the butanedinitrile, the lithium lanthanum zirconium tantalum oxide and the graphite phase carbon nitride are uniformly mixed to form a solid film; the polymer matrix is polyacrylonitrile and forms a framework of the electrolyte membrane; the lithium salt, the butanedinitrile, the lithium lanthanum zirconium tantalum oxide and the graphite phase carbon nitride are at least physically and uniformly dispersed in the polymer matrix. The electrolyte membrane can be prepared through the steps of slurry preparation, defoaming treatment, membrane forming processing, drying and curing and the like, and can be used in a solid-state lithium battery, so that the contact between the electrolyte membrane and an electrode interface is improved, side reaction is inhibited, the ion transmission efficiency and mechanical property are improved, the interface impedance is reduced, and the cycling stability and safety of the solid-state lithium battery are enhanced.

The invention relates to the technical field of niobium-tantalum-iron ore purification, in particular to a method for preparing high-purity tantalum pentoxide and niobium pentoxide from niobium-tantalum-iron ore. The method comprises the following steps: firstly, adding ammonium fluoride and ammonium sulfate to help mineral decomposition and reduce the roasting temperature, then treating the niobium-tantalum iron ore by using a sulfuric acid-hydrofluoric acid mixed solution to fully dissolve niobium-tantalum oxides, then extracting and separating niobium and tantalum by using a specific solvent system, and finally adding ammonia water to precipitate and calcine to obtain the niobium-tantalum iron ore. The high-purity niobium pentoxide and tantalum pentoxide are prepared, the product yield is high, the impurity content is low, and the niobium pentoxide and tantalum pentoxide are suitable for being used as raw materials of capacitor-grade tantalum powder and niobium powder.

The invention provides a method for extracting tantalum and niobium from tungsten tailings, and belongs to the technical field of rare metal recovery, and the method comprises the following steps: adding a reducing agent, a fluxing agent, a covering agent and a slag former into the tungsten tailings, and heating and smelting under the protection of inert gas to obtain an alloy ingot; the alloy ingot is crushed and then leached through hydrochloric acid, and acid leaching residues containing tantalum, niobium and tungsten are obtained; the acid leaching residues are subjected to alkaline leaching, and alkaline leaching residues containing tantalum and niobium are obtained; the alkaline leaching residues are leached through hydrofluoric acid and sulfuric acid, and decomposition liquid is obtained; and extracting and separating the decomposition liquid to obtain tantalum hydroxide and niobium hydroxide, and respectively calcining the tantalum hydroxide and niobium hydroxide to obtain tantalum oxide and niobium oxide. The method is simple in technological process, convenient to operate, low in cost and suitable for industrial production, tantalum and niobium can be efficiently extracted from tungsten tailings, and good economic benefits and environmental benefits are achieved.

The invention discloses an anodic oxidation method for improving the uniformity of a dielectric layer of a capacitor. The anodic oxidation method comprises the following steps that a tantalum block is pretreated and then placed in an electrolytic bath; adding electrolyte into the electrolytic bath, and performing oscillation circulation through an oscillator; a tantalum block is sequentially subjected to a pre-oxidation procedure, a main oxidation procedure, a stabilization procedure, heat treatment and constant-pressure treatment, the tantalum block is taken out after treatment is finished, and the tantalum block is cleaned and dried to finish anodic oxidation. The ultrasonic oscillator is additionally arranged in the electrolytic bath, so that the electrolyte concentration gradient can be eliminated, and the thickness uniformity of the dielectric layer is improved. And by adding ammonium dihydrogen phosphate, micropores are filled, the surface of the tantalum block is passivated, and the performance of a capacitor prepared from the tantalum block is improved. Through a staged dynamic oxidation method and a composite electrolyte formula, the uniformity and reliability of a tantalum oxide dielectric layer are remarkably improved, and the method is suitable for industrial production of a high-reliability tantalum capacitor.

The invention discloses an on-chip integrated laser source and a preparation method thereof. According to the on-chip erbium-doped laser source, tantalum oxide doped with rare earth ions serves as a gain dielectric layer, tantalum oxide not doped with rare earth ions serves as a waveguide layer to be deposited on the gain dielectric layer to form a double-layer thin film structure, and then an Euler bent micro-ring resonant cavity structure is designed and prepared on the undoped layer. Compared with a conventional micro-ring resonant cavity prepared on a rare earth doped film, the Euler micro-ring designed in the invention not only can reduce scattering loss and high-order mode crosstalk in a wide waveguide, but also can avoid roughness caused by conventional direct etching of a rare earth ion doped film layer.

The invention discloses a device and a method for preparing tantalum powder by reducing gaseous magnesium, and solves the problems of high oxygen content, poor particle uniformity, incomplete reaction and the like in the prior art. The device adopts a vertical multi-layer reaction furnace structure, and realizes efficient reduction of tantalum oxide through heating of a resistance wire and reaction with gaseous magnesium. The method comprises gaseous magnesium reduction and product post-treatment. The oxygen content of the tantalum powder prepared through the method is controlled to be 3000-6000 ppm, the specific volume reaches 80000-100000 mu F.V / g, the apparent density ranges from 1.5 g / cm < 3 > to 1.8 g / cm < 3 >, particle size distribution is uniform, and the method is suitable for large-scale production of electronic-grade tantalum powder.

The invention discloses a surface active agent modified titanium anode coating and a preparation method and application thereof, and belongs to the technical field of electrode material coatings, the surface active agent modified titanium anode coating comprises an iridium tantalum oxide coating added with a surface active agent, and the surface active agent is polyacrylamide or polyethylene glycol; and the use amount of the surfactant is 30-70% of the critical micelle concentration. The preparation method comprises the following steps: uniformly mixing the surfactant and the active iridium tantalum oxide coating liquid; depositing the iridium tantalum oxide coating liquid containing the surfactant on the titanium substrate containing the intermediate layer according to a deposition method; and the deposition operation is repeated until the iridium content in the iridium tantalum oxide coating reaches the standard. The surface of the coating provided by the invention is in a three-dimensional porous shape with proper pore diameter, and the electrochemical activity and the service life of the titanium anode surface coating catalyst are remarkably improved and prolonged. The preparation process provided by the invention is simple, feasible, safe, green, low in cost and beneficial to industrial production.

The invention relates to a diaphragm, a preparation method thereof, a secondary battery and a device. The diaphragm provided by the invention comprises a diaphragm body; the solid electrolyte layer is arranged on the diaphragm body, the solid electrolyte layer comprises a modified metal oxide, the modified metal oxide comprises a metal oxide and a silane compound connected to the surface of the metal oxide, and the silane compound is connected to the surface of the metal oxide. The metal oxide comprises at least one of lithium aluminum titanium phosphate, lithium lanthanum zirconium oxide, lithium lanthanum zirconium tantalum oxide, lithium lanthanum zirconium aluminum oxide, lithium lanthanum titanium oxide, lithium aluminum germanium phosphate and lithium lanthanum aluminum titanate. According to the invention, the hydrophobic modified metal oxide is coated on the diaphragm body and the solid electrolyte layer is formed, so that the moisture value of the solid electrolyte coated diaphragm is remarkably reduced, the negative influence of the moisture of the diaphragm on the battery performance is relieved, and the coulombic efficiency and the cycle performance of the secondary battery using the diaphragm are improved.

The invention belongs to the technical field of target material production, and particularly relates to a metal oxide powder composition, a doped indium oxide target material and a preparation method and application of the doped indium oxide target material. The metal oxide powder composition provided by the invention comprises the following components in percentage by mass: 95.5-99.1% of indium oxide powder, 0.3-1.5% of titanium oxide powder, 0.3-1.5% of zirconium oxide powder and 0.3-1.5% of tantalum oxide powder, an indium oxide doped target prepared from the metal oxide powder composition has low resistance, and a TCO film prepared from the metal oxide powder composition has high mobility and high light transmittance (greater than 85%) in a near-infrared band.

The present application relates to the technical field of target materials, and specifically discloses a tin oxide-based target material, a preparation method therefor, and a use thereof. Raw materials for the preparation of the tin oxide-based target material of the present application comprise, in parts by mass, 91-95 parts of tin oxide, 1.5-3.5 parts of tantalum oxide, 1.5-3.5 parts of zinc oxide, 0.5-2 parts of tungsten oxide, and 0.3-1.5 parts of gadolinium oxide, and further comprise a binder and a plasticizer. The present application further provides a preparation method for the tin oxide-based target material and a use of the tin oxide-based target material. The tin oxide-based target material provided by the present application has high density and extremely low resistivity, wherein the density of the tin oxide-based target material is greater than or equal to 6.5 g / m3, and the resistivity thereof is smaller than or equal to 1×10-2Ω·cm. Therefore, the tin oxide-based target material can be suitable for direct-current (DC) magnetron sputtering coating. In addition, due to the advantages of good light transmittance and low resistivity, the tin oxide-based target material of the present application can further improve battery conversion efficiency and can be applied to photovoltaic heterojunction batteries and perovskite batteries.

The invention provides a dielectric filler-doped solid electrolyte, a lithium metal battery and a preparation method, the dielectric filler-doped solid electrolyte comprises a polyether matrix, and the polyether matrix is formed by dispersing a lithium salt and a dielectric filler, the dielectric filler is two or more of barium titanate (BaTiO3), strontium titanate (SrTiO3), zirconium oxide (ZrO2), hafnium oxide (HfO2), titanium oxide (TiO2), cerium oxide (CeO2), zinc oxide (ZnO), lanthanum oxide (La2O3), aluminum oxide (Al2O3), tantalum oxide (Ta2O5) and yttrium oxide (Y2O3).

The utility model belongs to the technical field of ceramic particle processing, and particularly relates to an impurity removal device for grinding raw materials, which comprises a fixed seat, and a screening frame is arranged on the inner side of the fixed seat; the top end of the inner side of the screening frame is movably connected with a screening net. Sliding frames are fixedly connected to the four end corners of the inner side of the fixing base. The outer side of the sliding frame is slidably connected with a connecting base. The connecting seat is fixedly connected with the screening frame; a shaking assembly; the screening frame is arranged on the inner side of the screening frame; the shaking assembly is used for being matched with the screening net for use. Through the cooperative design of the reciprocating assembly and the shaking assembly, the reciprocating assembly drives the screening net to rapidly move left and right to screen ceramic tantalum oxide, the shaking assembly drives the screening net to move up and down in the screening frame to conduct shaking screening on the ceramic tantalum oxide, and through the dual simultaneous operation screening mode, the screening efficiency is improved. And the screening effect on the ceramic tantalum oxide is improved.

The invention discloses a surface modification method for a silicon-carbon composite material electrode, which belongs to the technical field of lithium ion battery negative electrode materials, and mainly comprises the following steps: modifying the surface of the silicon-carbon composite material electrode by magnetron sputtering; wherein the modification material comprises a metal material and / or a solid electrolyte material; the metal material is selected from Al, Cu or In; the solid electrolyte material is selected from titanium aluminum lithium phosphate or gallium-doped lithium lanthanum zirconium tantalum oxide. The method solves the problems of poor conductivity, unstable SEI film and volume effect of the silicon-carbon electrode, and after the prepared electrode is assembled into a battery, the performance of the battery is superior to that of an unmodified electrode, the battery is adaptive to a solid-state battery, and the electrode has industrialization potential and application value.

The invention discloses a TaC coating, a preparation method of the TaC coating, a crucible containing the TaC coating and application of the crucible, and belongs to the field of semiconductor coating material preparation. The method comprises the following steps: coating the surface of a carbon matrix with first tantalum-containing slurry, and carrying out solid-phase sintering reaction to obtain a porous preset coating; placing the porous preset coating and tantalum oxide powder in a closed container, gasifying the tantalum oxide powder through vapor deposition, and enabling gaseous tantalum oxide to permeate into the porous structure of the porous preset coating and react with the surface of the carbon matrix exposed in the porous structure to generate a continuous tantalum carbide barrier layer in situ; and finally, coating the surface of the porous preset coating subjected to vapor deposition with the second tantalum-containing slurry, curing, and carrying out densification sintering in a hydrocarbon atmosphere to obtain the tantalum-containing porous coating. The TaC coating obtained through the method is high in bonding force with an interface, uniform in thickness, high in structure morphology density, few in grain boundary pores and suitable for being applied to the high-purity semiconductor crystal growth industry.

The embodiment of the invention discloses a donor-receptor complementary co-doped hafnium oxide-based ferroelectric film material and a preparation method thereof. The method comprises the following steps: according to the composition of the donor-receptor complementary co-doped hafnium oxide-based ceramic target material, mixing raw material powder to obtain mixed raw material powder; calcining the mixed raw material powder under a preset condition; pressing and molding the calcined product into a target material green body; and sintering the target material green body to obtain the donor-receptor complementary co-doped hafnium oxide-based ceramic target material. Wherein the composition of the donor-acceptor complementary co-doped hafnium oxide-based ceramic target material is expressed as AxByHf (1-x-y) O2, A is a donor and comprises elements niobium and tan, and B is an acceptor and comprises elements yttrium and lanthanum; x is more than 0.01 and less than 0.05, and y is more than 0.01 and less than 0.05; the raw material powder containing the donor comprises niobium oxide and tantalum oxide, and the raw material powder containing the acceptor comprises yttrium oxide and lanthanum oxide; and taking the donor-acceptor complementary co-doped hafnium oxide-based ceramic target material as a sputtering target, and obtaining the donor-acceptor complementary co-doped hafnium oxide-based ferroelectric material film by using a pulse laser deposition method.

The invention discloses a lithium lanthanum zirconium tantalum oxide solid electrolyte with a lithium tantalate composite garnet structure and a preparation method of the lithium lanthanum zirconium tantalum oxide solid electrolyte, and belongs to the technical field of all-solid-state lithium ion batteries. The preparation method comprises the following steps: heating lanthanum oxide, ball-milling and uniformly mixing the lanthanum oxide, lithium hydroxide monohydrate, zirconium oxide and tantalum oxide in isopropanol, and pre-sintering to obtain a precursor; and performing secondary ball milling on LiTaO3 accounting for 1-10% of the mass of the precursor and the precursor, uniformly mixing, drying, tabletting, and sintering at high temperature to obtain the solid electrolyte material. The ionic conductor LiTaO3 is introduced into the grain boundary of the lithium lanthanum zirconium tantalum oxide solid electrolyte, the porosity is reduced, the grain boundary bonding strength is enhanced, the resistance and activation energy of the electrolyte are reduced in the sintering process, lithium tantalate does not react with the garnet structure solid electrolyte, impurities hindering ion transmission are not generated, the ionic conductivity at the room temperature is improved, and the service life of the lithium lanthanum zirconium tantalum oxide solid electrolyte is prolonged. The migration activation potential barrier of lithium ions is reduced, and the problem of low total ionic conductivity caused by the grain boundary problem is effectively solved.

The invention provides a method for preparing niobium-tantalum oxide solid solution ((NbxTa1-x) 2O5) powder, and belongs to the technical field of ceramic powder preparation. According to the method, (Nb, Ta) (C, N) carbonitride is used as a precursor, and (NbxTa1-x) 2O5 oxide solid solution powder is prepared through a one-step oxidation reaction. The specific operation comprises the following steps: placing a precursor in a furnace, heating the precursor to 1000-1500 DEG C at a heating rate of 5 DEG C / min in an air atmosphere, keeping the temperature for 1-5 hours, and finally cooling the product to room temperature along with the furnace to obtain the (NbxTa1-x) 2O5 powder. The preparation method simplifies the preparation process, saves energy, does not need to use an organic solvent, meets the environmental protection requirement, and is suitable for large-scale production. The (NbxTa1-x) 2O5 solid solution powder shows wide application potential in the field of electrolytic capacitors.

This invention provides a method for producing high-purity aluminum-niobium-tantalum master alloys and co-producing ammonium fluoride, belonging to the fields of metallic materials and inorganic chemicals. The invention involves mixing fluoroniobic acid, fluorotantalic acid, and ammonia water for a precipitation reaction to obtain a precipitate and an ammonium fluoride solution. The ammonium fluoride solution is then concentrated, cooled for crystallization, dehydrated, and dried sequentially to obtain ammonium fluoride. The precipitate is then dried and oxidized and calcined sequentially to obtain an oxide. The oxide, aluminum powder, potassium chlorate, and calcium fluoride are mixed and subjected to a vacuum aluminothermic reaction to obtain the high-purity aluminum-niobium-tantalum master alloy. This invention, considering both broadening the range of raw material selection and optimizing the production process, reacts fluoroniobic acid, fluorotantalic acid, and ammonia water to produce niobium hydroxide and tantalum hydroxide precipitates, which are then oxidized and calcined to form niobium and tantalum oxides. The high-purity aluminum-niobium-tantalum alloy is then prepared using a vacuum aluminothermic reaction. Simultaneously, ammonium fluoride can be co-produced, resulting in high raw material utilization.

The present application relates to the field of electrochemical wastewater biological treatment technology, and discloses an electrode, a preparation method thereof and application of the electrode in strengthening methane production of a membrane bioreactor.The preparation method comprises the following steps: step (1): impregnating a foamed carbon matrix in a dispersion system containing a tantalum precursor under vacuum conditions, and obtaining an intermediate after drying; step (2): heat treating the intermediate at 400-600 DEG C in the presence of a protective atmosphere for at least 1 h, and obtaining a foamed carbon electrode loaded with modified tantalum oxide.The present application adopts an impregnation-heat treatment method to prepare a foamed carbon electrode loaded with modified tantalum oxide, and uses a MEC-AnMBR system constructed by the electrode to treat low-intensity municipal wastewater, thereby achieving efficient anaerobic digestion methane production and membrane pollution collaborative control under a full temperature gradient, and providing a low-cost, easily enlarged technical solution for energy self-sufficiency of a wastewater treatment plant.

The present invention relates to an aluminum-tantalum oxide glass with high hardness, high Young's modulus, and ultra-high refractive index, as well as a preparation method and application thereof. The aluminum-tantalum oxide glass comprises: 25-32 mol% Al2O3, 30-36 mol% Ta2O5, 5-12 mol% ZrO2, 5-15 mol% of a first metal oxide, and 5-15 mol% of a second metal oxide, with the total molar sum of the components being 100 mol%. The first and second metal oxides are selected from two of the group consisting of Gd2O3, La2O3, Sc2O3, Tm2O3, Lu2O3, Yb2O3, HfO2, Nb2O5, and Ga2O3.

The dielectric includes a first portion and a second portion. The first portion includes tantalum oxide and tellurium and is located on a surface of the dielectric. The second portion includes tantalum oxide and is covered by the first portion. The tellurium content in the first portion is higher than the tellurium content in the second portion.