784 results about "Tantalum" patented technology

The invention relates to the technical field of multi-source information analysis, in particular to a niobium-tantalum metal ore metallogenic evaluation system based on multi-source information analysis, which comprises a geologic structure association module, a mineral distribution interpretation module, a metallogenic environment adaptation module, a spatial feature analysis module and a potential region judgment module. According to the method, by introducing a multi-source data analysis and fusion method, the evaluation precision and comprehensive capability of resource exploration are effectively improved, analysis after information fusion is combined with relevance and spatial modes of different data types, it is ensured that mineralization potential evaluation is more accurate, the limitation of a single data source and manual analysis is overcome, and the method is suitable for popularization and application. According to the method, the identification precision and reliability of the mineralization law are improved, the potential area can be identified more accurately, resource potential analysis is optimized in combination with the adaptability of the mineralization environment, the efficiency and accuracy of determining the mineralization area are remarkably improved, the problems of information isolation and analysis deviation in a traditional method are avoided, and the scientificity and the practical application value of the exploration process are enhanced.

The invention provides a surface-modified sulfide electrolyte and a preparation method thereof, and an all-solid-state battery, the surface-modified sulfide electrolyte comprises a sulfide electrolyte and a modification layer coated on the surface of the sulfide electrolyte, the chemical general formula of the modification layer is LiaMbNcXd, 0 < = a < = 3, 0 < = b < = 1, 0 < = c < = 1, 0 < = d < = 6, and 0 < = c < = 1. M is at least one element of magnesium, aluminum, calcium, iron, zirconium, niobium, tantalum, tungsten, gadolinium, yttrium, indium, hafnium, lanthanum and ytterbium, and X is at least one element of oxygen, sulfur, fluorine, chlorine, bromine and iodine. According to the surface-modified sulfide electrolyte, the modification layer with high ionic conductivity and high oxidation potential is coated outside the sulfide electrolyte, so that when the surface-modified sulfide electrolyte is applied to a positive electrode of an all-solid-state battery, the modification layer can improve the oxidation potential of the electrolyte on the premise of not reducing the ionic conductivity of the electrolyte; the effects of improving the interface stability between the positive electrode active material and the sulfide electrolyte and further improving the cycle performance of the battery are achieved.

The invention discloses a component gradient iridium tantalum coating anode and a preparation method thereof, the component gradient iridium tantalum coating anode comprises a titanium-based bottom layer, a middle layer and a surface active layer structure with component gradient, and the middle layer and the active layer are both prepared through a thermal decomposition method. And the intermediate layer is prepared on the titanium substrate and is composed of TiO2 / Ta2O5 mixed oxide. The surface active layer is prepared on the outer side of the middle layer and comprises a plurality of layers of IrO2 / Ta2O5 oxide coatings with different iridium-tantalum proportions. Compared with a traditional uniform coating anode, the prepared component gradient iridium tantalum coating anode can relieve the stress concentration phenomenon and reduce coating cracking, the service life of the anode is remarkably prolonged, and the catalytic activity of the anode is remarkably improved; the modified carbon nano tube is added into the active layer precursor solution, so that the conductivity change caused by component gradient is improved, and the cell voltage of the component gradient iridium tantalum coating anode is effectively reduced; and moreover, the iridium content is lower, and the preparation cost of the electrode is reduced.

The invention belongs to the field of nickel-based alloy materials, and discloses a precipitation hardening type nickel-based alloy welding wire and a preparation method thereof.The precipitation hardening type nickel-based alloy welding wire comprises, by mass, 50%-60% of nickel, 15%-20% of chromium, 15%-20% of iron, 2%-4% of molybdenum, 2%-5% of niobium, 0.01%-2% of tantalum, 0.2%-2% of aluminum, 0.5%-1.2% of titanium, 0.03%-0.08% of carbon, 0.1%-0.5% of manganese, 0.1%-0.5% of silicon, 0.01%-0.05% of magnesium, 0.01%-0.05% of yttrium, 0.5%-2% of tungsten, 0.1%-0.6% of cobalt, 0.001%-0.02% of boron and the balance impurities; according to the precipitation hardening type nickel-based alloy welding wire and the preparation method thereof, through component optimization and process innovation, the nickel-based alloy welding wire with high-temperature strength, excellent hot crack resistance and welding toughness is provided.

The invention provides a preparation method of a high-performance titanium anode. The preparation method comprises the following steps: pretreating a titanium substrate; the preparation method comprises the following steps: coating a tantalum-containing solution on a titanium substrate, and carrying out drying, pre-sintering and oxidation treatment to form a Ta2O5 bottom layer; wherein the drying temperature ranges from 80 DEG C to 110 DEG C, and the drying time ranges from 8 min to 12 min; the presintering temperature is 450-550 DEG C, and the presintering time is 8-15 minutes; the oxidation treatment temperature ranges from 600 DEG C to 680 DEG C, and the oxidation treatment time ranges from 1.5 h to 2.5 h; the surface of the Ta2O5 bottom layer is coated with a Pt-Ti alloy solution, then sintering is conducted for 10-20 min at the temperature of 500-550 DEG C, and a middle layer is formed; the surface of the middle layer is coated with an Ir-Ta-Sn-Co-Mn solution for 3-5 times, sintering is conducted for 10-15 min at the temperature of 500-600 DEG C after each time of coating, and a surface active layer is formed; wherein the molar ratio of all metal components in the Ir-Ta-Sn-Co-Mn solution is as follows: Ir: Ta: Sn: Co: Mn is equal to 7.16: 4.5: 0.8: 0.8: (0.5-1.2). According to the preparation method of the high-performance titanium anode, through staged sintering, multi-layer component regulation and control and process optimization, the problems of insufficient coating compactness, matrix passivation and low Ir utilization rate are solved, and the technical effects that the strengthening life is larger than or equal to 20 days (40000 A / m), and the bath voltage reduction is larger than or equal to 10% are achieved. The invention further provides the high-performance titanium anode and application thereof.

The invention belongs to the field of metal materials, and particularly relates to a niobium alloy material which mainly comprises the following elements in percentage by weight: 4%-8.5% of tantalum, 4%-8.5% of tungsten, 1%-3% of molybdenum, 0.8%-2.5% of zirconium, 0-0.2% of carbon and the balance of niobium. The invention further relates to a method for preparing the niobium alloy material. The compactness of the niobium alloy material and the tensile property at the room temperature and the high temperature are obviously improved.

The invention relates to the field of coatings, and discloses a wear-resistant and corrosion-resistant high-entropy alloy composite coating and a preparation method thereof.The wear-resistant and corrosion-resistant high-entropy alloy composite coating is prepared by depositing functional high-entropy alloy composite powder on the surface of a base body in a laser cladding mode, the functional high-entropy alloy composite powder comprises high-entropy alloy powder, a modified additive and composite ceramic powder, the modified additive is prepared by using urea and titanium tetrachloride as raw materials, growing nano titanium nitride particles on the surface of a silicon carbide nanowire in situ to prepare a nano titanium nitride / silicon carbide nanowire composite material, and then coating a layer of nano titanium dioxide particles on the surface of the nano titanium nitride / silicon carbide nanowire composite material by using tetrabutyl titanate; and the composite ceramic powder is prepared by compounding zirconium carbide, niobium carbide, hafnium carbide and tantalum disilicide. The hardness, wear resistance and corrosion resistance of the high-entropy alloy coating are enhanced by adding the modified additive and the composite ceramic powder.

Tantalum powder, comprising pure tantalum powder or tantalum alloy powder, wherein the particle size distribution of the tantalum powder has the following characteristics: (1) Dv90 < 5 μm; and (2) Dv10 > 0.5 μm. The tantalum powder has a narrow particle size distribution and does not contain nanoscale ultrafine particles, and has high stability and a high utilization rate. The present invention further relates to a method for preparing tantalum powder.

The invention belongs to the technical field of geological prospecting evaluation, and discloses an ore body positioning method and a rapid sampling device for niobium-tantalum ore target region prediction and evaluation. According to the method, based on existing geological data, various geologic bodies in a 1: 250,000-1: 10,000 geological map are analyzed, distribution, form, invasion contact relation, formation times and other characteristics of alkaline rock masses are found out, and a favorable metallogenic area is delineated; a linear structure, an annular structure and alteration information are recognized through satellites and aerial images, and target area positioning is assisted; the method comprises the following steps: exploring and detecting ore-bearing rock mass and fracture structures through a magnetic method, delineating potential positions of ore bodies, and inferring geological attributes of abnormal sources in combination with geological data; measuring the total amount of gamma at different positions in the niobium-tantalum prediction target area by using radioactive detection equipment, and preliminarily judging the position of the niobium-tantalum ore according to a gamma abnormal result; and carrying out systematic sampling and assay analysis on the target area by using the rapid sampling device. By means of the method and device, the metallogenic geological condition and the prospecting prospect can be evaluated, and the exploration network degree is optimized.

The invention discloses a high-temperature-oxidation-resistant titanium-tantalum-zirconium-niobium high-entropy alloy material and a preparation method thereof, and relates to the technical field of high-temperature alloy materials. The titanium-tantalum-zirconium-niobium high-entropy alloy serves as a matrix, regulation and control elements oxygen and vanadium are introduced, directional optimization of oxidation resistance and mechanical performance is achieved, the oxidation rate reaches 8.1178 * 10 <-10 > mg < 2 >. Cm <-4 >. S <-1 > after the alloy is subjected to static oxidation for 24 hours at the temperature of 900 DEG C by doping oxygen, a compact and stable oxidation film is formed on the surface, and the high-temperature oxidation resistance is remarkably improved; and the room-temperature tensile property is improved by adding the vanadium element. The high-temperature-oxidation-resistant titanium-tantalum-zirconium-niobium high-entropy alloy material provided by the invention realizes directional optimization of performance and diversified expansion of a material system, and is suitable for application requirements in the fields of aerospace engine hot end parts, high-temperature structural parts and the like; the problems that an existing alloy is limited in oxidation resistance, insufficient in mechanical property and complex in preparation process are effectively solved.

The invention relates to the technical field of semiconductor material preparation, and provides a TaC composite coating process based on a carbon nanostructure transition layer and a product thereof. The method comprises the following steps: a) pretreating the surface of a base material to form a groove, b) introducing a carbon source gas, carrying out first chemical vapor deposition under the action of a metal salt catalyst to grow carbon nanoparticles, and depositing the base material pretreated in the step a) to obtain a transition layer deposition base material, c) gasifying a tantalum source, mixing the gasified tantalum source with the carbon source gas, a reaction gas and a carrier gas, and carrying out second chemical vapor deposition to obtain the transition layer deposition base material. And second chemical vapor deposition is conducted, the transition layer deposition base material is filled with the fine grain particle layer, then deposition continues to be conducted on the surface of the transition layer deposition base material to form the coarse grain particle layer, and finally the TaC composite coating is obtained. According to the method, the compactness of the coating can be improved, the bonding strength of the coating and the base material is enhanced, the performance of the TaC composite coating is improved, the service life of the TaC composite coating is prolonged, and the reliability of the TaC composite coating is improved.

The invention discloses a composite crucible for large-size AlN single crystal growth and a preparation method thereof, and belongs to the technical field of PVT method crystal growth. A heat conduction device is arranged in a cavity of the composite crucible and is composed of a plurality of high-purity graphite plates, the high-purity graphite plates are distributed at equal included angles to form a wing-shaped structure, the inner surface of the high-purity graphite crucible and the surfaces of the high-purity graphite plates are covered with a metal tantalum Ta layer or a TaC coating, and the high-purity graphite plates and the high-purity graphite plates are subjected to heat conduction under the temperature environment of 1800-2600 DEG C, so that the heat conduction effect of the high-purity graphite plates is improved. And TaC / C material layers are formed on the inner surface of the high-purity graphite crucible and the high-purity graphite plate. The heat conduction efficiency of the large-size crucible can be greatly improved, the problem that heat transfer from the side wall of the crucible to the source powder center is insufficient in the powder burning process can be remarkably solved, the uniformity of large-size AlN crystals is improved, thermal stress in crystal growth is relieved, and favorable conditions are created for preparing large-size and high-quality AlN single crystals.

The invention relates to the technical field of electrical performance testing, and discloses a multi-class nonferrous metal breakdown voltage testing device, system and method. The testing device comprises a testing groove provided with a plurality of independent clamping grooves, a temperature and humidity regulation and control system, an electrode module, a power module and a data acquisition module, and high-precision breakdown voltage testing of multiple samples in a constant environment is achieved through multi-channel synchronous testing, temperature and liquid level dynamic control, symmetrical electrode layout and high-speed data acquisition. The system is integrated with a central control unit, the boosting rate is automatically set according to sample parameters, multiple channels independently boost and synchronously collect breakdown data, and a double-threshold algorithm is adopted to judge breakdown events in real time. The method comprises the whole process of solution preparation, sample installation, electric field optimization, boost control and data judgment. Compared with the prior art, the testing efficiency and the measuring precision are improved, the environmental interference is reduced, and the method is suitable for batch detection and quality control of tantalum, niobium and oxide materials of the tantalum, the niobium and the oxide materials of the tantalum and the niobium.

The invention provides a high-strength niobium alloy processing method, which relates to the technical field of alloy processing, and comprises the following steps: step 1, ingot casting preparation: niobium, tungsten, tantalum, molybdenum, zirconium and carbon are subjected to powder mixing and ingot casting to obtain a first alloy product; step 2, extrusion processing: heating the first alloy product by adopting a medium-frequency induction furnace, and carrying out extrusion treatment by adopting an extrusion ingot supply device to obtain a second alloy product; step 3, forging: performing intermediate annealing treatment on the extruded second alloy product twice by adopting a first annealing process in the forging process to obtain a third alloy product; wherein free forging treatment is carried out on the alloy product between the two times of intermediate annealing treatment; and (4) finished product processing: carrying out finished product annealing treatment on the third alloy product by adopting a second annealing process to obtain the final high-strength niobium alloy. Wherein in the second annealing process, the temperature is increased to 1200-1450 DEG C at the speed of 18-20 DEG C / min, and heat preservation is conducted for 60-120 min. According to the scheme, the strength of the niobium alloy can be improved.

The invention discloses a magnetic multilayer film device based on spin orbit torque and a preparation method, and relates to the technical field of spintronics, and the device is composed of a Hall bar composed of a magnetic multilayer film and a Ti / Au composite electrode. Wherein the magnetic multilayer film is composed of a buffer layer, a heavy metal layer, a ferromagnetic layer and an oxide covering layer. In the invention, the buffer layer is tantalum; the heavy metal layer is platinum-holmium alloy; the ferromagnetic layer is cobalt iron boron; and the covering layer is magnesium oxide. According to the invention, the spin Hall angle of the SOT device is improved, and the energy consumption of the device is reduced. When a device is subjected to in-situ annealing, a sample table with an adjustable angle is used for constructing a temperature gradient to realize SOT-based magnetization overturning without in-plane field assistance, and a brand new technical route is provided for subsequent research and development of SOT-MRAM.

A mineral separation method for separating and enriching tantalum, niobium and zinnwaldite from feldspar tailings, comprising the following steps: Step 1: Predispersion; Step 2: Vibration classification; Step 3: Strong dispersion; Step 4: Magnetic rough separation; Step 5: Magnetic cleaning; Step 6: Strong dispersion; Step 7: Flotation rough separation; Step 8: Flotation cleaning; Step 9: First pressure filtration; Step 10: Magnetic scavenging; Step 11: Second pressure filtration; Step 12: Flotation scavenging. Compared with the prior art, the advantages of the present invention are as follows: (1) Using a high-speed shearing machine for dispersion can greatly improve the dispersion effect and is beneficial to the subsequent separation of various minerals; Using a high-intensity slurry magnetic separator can effectively remove slime, which is beneficial to the further flotation separation of tantalum and niobium minerals from zinnwaldite and improve the recovery rate; Using a flotation column for the separation of tantalum and niobium ore and zinnwaldite has a large processing capacity, a high recovery rate and environmental neutrality, which is beneficial to environmental protection.

The invention discloses a manganese-doped Ir-Ta oxide composite coating titanium anode and a preparation method thereof. The titanium anode comprises an insoluble titanium base material, an oxide middle layer and an oxide catalyst layer which are sequentially arranged, wherein the oxide catalyst layer is composed of an iridium (Ir) oxide, a tantalum (Ta) oxide and a doped manganese (Mn) element. The preparation method comprises the following steps: carrying out sand blasting and surface treatment on a titanium substrate to increase the roughness and binding force of the surface, then carrying out proper intermediate layer coating on the surface of the substrate, and finally preparing the manganese-doped Ir-Ta oxide composite coating on the surface of the intermediate layer. Compared with a traditional titanium anode, the prepared manganese-doped Ir-Ta oxide composite coating titanium anode has the advantages of being higher in reaction specific surface area, lower in oxygen evolution potential, longer in catalytic life and the like, and meanwhile the transition metal element manganese is higher in reserve, lower in price and high in oxygen evolution activity.

The invention discloses a regulation and control method for a tantalum coating phase based on low-temperature magnetron sputtering and application of the regulation and control method, and belongs to the field of coating preparation. The regulation and control method comprises the following steps: (1) pretreatment: carrying out high-energy bombardment on a matrix material; (2) regulating and controlling the phase of the tantalum coating as a beta phase: depositing an elemental tantalum coating on the surface of the pretreated matrix material; and (3) regulating and controlling the phase of the tantalum coating to be an alpha phase: firstly depositing a base coat on the surface of the pretreated matrix material, and then depositing the elemental tantalum coating. Through the low-temperature magnetron sputtering technology, controllable deposition of the beta phase / alpha phase of the tantalum coating at the temperature of 100 DEG C or below is achieved, the beta phase is obtained without a bottoming layer, the alpha phase is obtained through pure titanium or titanium-tantalum mixed bottoming layer, the alpha phase crystallinity is improved through low-energy interface regulation and control, the titanium-tantalum mixed layer can coordinate the thermal expansion difference, the high binding force of the coating is kept, and therefore the titanium-tantalum composite coating has the good application prospect. The method is suitable for sand blasting and acid etching of the titanium alloy dental implant, low-temperature process compatibility and clinical performance are both considered, and the problems of phase regulation and bonding strength are solved.

The invention relates to an automatic filling rubber sheath preforming method and device for rare refractory metal powder. The device comprises a vacuum feeding mechanism, a weighing and metering mechanism, a vibration filling mechanism, an automatic plugging mechanism, a sheath transposition mechanism, a manipulator loading and unloading mechanism and a control system. According to the system, efficient, uniform and sealed filling of tantalum powder is achieved through vacuum material suction, weighing control, filling and compaction at the same time, automatic plugging and sealing and bag sleeve replacement through linkage of a mechanical arm. The control system coordinates sequential operation of all links on the basis of signals of multiple sensors, the powder amount range of a single bag is 6-17 kg, and the control system is matched with rubber bags of multiple specifications such as phi 60 * 1000 mm and the like. According to the method, the powder loading density consistency, the sealing reliability and the production line rhythm are improved, the labor intensity and the dust pollution are remarkably reduced, and the method is suitable for the field of metallurgy preforming of tantalum, alloy powder of tantalum and other metals.

The invention belongs to the technical field of geological sample analysis and detection, and particularly discloses a method for measuring the amount of each element of lithium ore in a closed acid-soluble system, and the method comprises the following steps: pretreating the lithium ore; the pretreated lithium ore is weighed and put into a closed sample dissolving device, hydrofluoric acid and purified nitric acid are sequentially added, and the closed sample dissolving device is closed; carrying out heat preservation on the closed sample dissolving device twice to obtain a test solution; and measuring the test solution by using an inductively coupled plasma mass spectrometer to obtain a working curve, and calculating the content of the analysis element in the sample solution by using the working curve. The method for determining the amount of each element in the lithium ore by adopting the closed acid-soluble system has the characteristics of simplicity in operation, high efficiency and good stability, realizes simultaneous determination of the amount of lithium, rubidium, cesium, beryllium, strontium, niobium, tantalum, zirconium, hafnium and rare earth elements in the large-batch lithium ore, and further provides a reference for determination of main trace elements in the lithium ore.

The invention provides a tantalum-niobium extraction device and a high-selectivity tantalum-niobium extraction agent preparation method thereof, and relates to the technical field of hydrometallurgy. The tantalum-niobium extraction device comprises a base, an extraction mechanism and an auxiliary mechanism; a heating seat is mounted above the base, an extraction barrel is mounted in the heating seat, a top plate is mounted at the top of the extraction barrel through bolts, and an air cylinder is mounted at the top of the top plate through bolts. According to the scheme, recycled metal parts (waste metal parts, electronic products and other waste recycled materials containing tantalum and niobium) are placed in the storage barrel, an extraction solvent is stored in the extraction barrel, and raw materials and the solvent are mixed through the storage barrel which ascends and descends in a reciprocating mode; one turning plate can be controlled in a linkage manner, and four linkage plates can be controlled in a linkage manner to perform clockwise and anticlockwise reciprocating turning motion, so that a solvent in the extraction barrel can be stirred in the turning process, and sufficient mixing and contact of the solvent and raw materials are ensured.

The invention provides a manufacturing method of an iridium tantalum titanium anode. The manufacturing method comprises the following steps: pretreating a titanium substrate; tantalum metal is plated on the surface of the titanium substrate in a vacuum mode through the magnetron sputtering technology, then sintering is conducted for 30-35 min at the temperature of 600-620 DEG C, and a tantalum middle layer with the thickness of 100-200 nm is formed; a mixed solution containing iridium and tantalum is sprayed on the surface of the tantalum middle layer, then pre-oxidation is conducted for 15-20 min at the temperature of 480-530 DEG C, an iridium-tantalum coating is formed, the iridium content is 18-25 g / m < 2 >, and the tantalum content is 15-18 g / m < 2 >; coating the surface of the iridium-tantalum coating with a base metal mixed solution for 3-4 times, and then sintering at 480-530 DEG C for 20-35 minutes to form an organic matter resistant coating with the thickness of less than or equal to 5 microns; wherein the base metal mixed solution contains ruthenium trichloride, and the ruthenium content in the organic matter resistant coating is 1.2-1.8 g / m < 2 >. According to the manufacturing method of the iridium-tantalum-titanium anode provided by the invention, the service life of the anode is prolonged and the cost is reduced by optimizing the tantalum coating process of the middle layer and the design of the surface coating. The invention further provides the iridium tantalum titanium anode manufactured by the manufacturing method.

The invention discloses a manufacturing method of a tantalum alloy T-shaped welding joint, and relates to the technical field of non-ferrous metal welding. The method comprises the steps that a tantalum alloy material is obtained, the performance and weldability are analyzed to determine a welding scheme, and a groove form and a gas protection device are designed; welding process parameters are optimized, and a gas protection device is adopted to complete welding; carrying out visual, macroscopic and microscopic detection on the welding seam to obtain a detection result; the method further comprises the steps of selecting matched welding wires, determining single-face V-shaped groove parameters, designing a gas protection device structure, optimizing welding current, treating a welding site and a material surface and the like. Compared with the prior art, the method can ensure the welding quality, maintain the material performance, realize high-precision welding, comprehensively evaluate the welding seam quality and improve the product reliability and safety.

The invention provides a method for recovering fluorine in tailings containing fluorine, tantalum and niobium. The recovery method comprises the following steps: mixing and leaching the fluorine-containing tantalum-niobium ore tailings and a sulfuric acid solution, and carrying out solid-liquid separation to obtain a leachate; mixing and reacting a reducing agent with the leaching solution to reduce iron ions in the leaching solution into ferrous ions, so as to obtain an extraction material solution; mixing the extraction feed liquid with an organic phase, carrying out extraction treatment, and carrying out phase splitting to obtain a fluorine-containing extraction liquid; the organic phase comprises trioctylamine, an additive and a diluent; and mixing the fluorine-containing extraction liquid with an alkali solution, carrying out reverse extraction treatment, and carrying out phase splitting to obtain a fluorine-containing reverse extraction liquid and a no-load organic phase.

The invention relates to a preparation method of a low-resistance silicon carbide coating based on a molybdenum / tantalum metal electrode, which comprises the following steps: S1, substrate pretreatment: carrying out mechanical micro roughening, ultrasonic cleaning and drying on a Mo / Ta electrode, and then reducing to remove an oxidation film; s2, Si-rich nucleation: taking methyl trichlorosilane as a Si / C common source, hydrogen as carrier gas / reducing gas and nitrogen as an n-type doping source for gas supply to form a compact nucleation layer; s3, main body deposition is conducted, specifically, the temperature is adjusted to 1140-1180 DEG C, the total pressure is maintained to be 80-120 Torr, and gas supply continues to be conducted for deposition; s4, annealing and dechlorination: stopping methyl trichlorosilane, keeping hydrogen and nitrogen flushing, and then annealing; and S5, cooling and shaping: cooling and taking out the sample annealed in the step S4, and adjusting the surface roughness to a set value to obtain the low-resistance silicon carbide coating on the Mo / Ta electrode. Compared with the prior art, on the premise that conductivity is not sacrificed, atomic oxygen / oxygen ion resistance, sputtering resistance, thermal cycling stability and the like of the Mo / Ta electrode can be remarkably improved.

The invention relates to the technical field of crystal growth, in particular to a crucible device for growth of silicon carbide single crystals with low-carbon wrappage and a growth method, and the crucible device comprises a crucible body, a crucible cover and silicon carbide seed crystals, a porous graphite cylinder used as a first filter is also arranged in the crucible body; the porous graphite cylinder is filled with tantalum particles used as a second filter; a shielding plate ring and a porous graphite plate used as a third filter are arranged above the porous graphite cylinder; a filling cavity used for containing silicon carbide powder is formed between the outer side wall of the porous graphite cylinder and the inner wall of the crucible body. According to the crucible device, gas components generated by sublimation of silicon carbide powder can be filtered through the porous graphite cylinder, the tantalum particles and the porous graphite plate, and carbon particles and other impurity particles in the gas components are filtered and removed; the crucible device solves the problems that silicon carbide single crystals grown by an existing crucible device in the prior art have the defects of carbon wrappage, microtubes, dislocation and the like.

The invention provides a method for preparing spherical aluminum tantalum alloy powder based on segmented voltage molten salt electrolysis. The method comprises the following steps: mixing Ta2O5 powder with a pore-forming agent and a conductive agent, pressing into a sheet, sintering at high temperature to prepare a Ta2O5 cathode sheet, carrying out segmented electrolysis in cryolite-based molten salt by taking graphite as an anode, and carrying out electrolysis at low voltage in the first stage, so that Ta2O5 is subjected to solid-state electrodeoxidation to be converted into tantalum particles; and then, the voltage is increased, aluminum ions in the molten salt are electrically deposited on the surfaces of the tantalum particles to form metal aluminum, aluminum-tantalum alloying reaction is induced, and the alloy product spontaneously forms spherical particles through the reaction heat release effect. The spherical aluminum tantalum alloy powder has the advantages of being short in technological process and low in cost, and the spherical aluminum tantalum alloy powder is uniform in particle size, high in sphericity degree, good in fluidity and suitable for the technical fields of laser beam / electron beam 3D printing, cladding forming, injection forming, thermal spraying and the like.

A grease composition that includes at least an oil-based medium, a thickener, and a fullerene-like nano-structure. The fullerene-like nano-structure includes a plurality of layers each comprised of a metal chalcogenide composition has a molecular formula of MX2, where M is a metallic element selected from the group consisting of titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), zirconium (Zr), niobium (Nb), molybdenum (Mo), technetium (Tc), ruthenium (Ru), rhodium (Rh), palladium (Pd), silver (Ag), cadmium (Cd), hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), mercury (Hg) and combinations thereof, and X is a chalcogen element selected from the group consisting of sulfur (S), selenium (Se), tellurium (Te), oxygen (O) and combinations thereof.

The invention relates to the technical field of mineral separation, in particular to separation equipment and a separation process for micro-fine particle low-grade tantalum-niobium ore, the separation equipment comprises an outer barrel, and a vibration barrel, a rotating barrel and a fixed barrel are sequentially arranged in an inner cavity of the outer barrel from the edge to the center; an annular partition plate is arranged on the upper portion of an inner cavity of the vibration cylinder, and a gap is reserved between the annular partition plate and the vibration cylinder. A wedge-shaped block is fixed at the bottom of the rotating cylinder; a spiral blade is fixed on the surface of the connecting shaft sleeve; circulating holes are formed in the upper end of the inner wall of the fixed cylinder; the device has the beneficial effects that the fixed cylinder which is kept fixed is arranged in the inner cavity of the rotating cylinder, when the rotating cylinder rotates, mineral aggregates rotate between the rotating cylinder and the fixed cylinder, crushing teeth can crush the mineral aggregates, crushed ore pulp can penetrate through filtering holes, and the device can crush the mineral aggregates and conduct centrifugal ore dressing on the ore pulp at the same time; and the mineral separation efficiency is prevented from being influenced by mutual adhesion and wrapping of mineral aggregates.

The utility model discloses a code disc for a reflective encoder, which relates to the technical field of encoder equipment and comprises a glass code disc, a low-reflection film is fixedly connected to the surface of the glass code disc, and a high-reflection film is fixedly connected to one side, far away from the glass code disc, of the low-reflection film. The low-reflection film is formed by plating acid-resistant alkali metal and metal oxide through a vacuum coating machine, the acid-resistant alkali metal comprises niobium, molybdenum, tantalum and hafnium, one of the niobium, the molybdenum, the tantalum and the hafnium is short for H, the metal oxide comprises sio2, sio, al2o3 and zro2, one of the sio, the al2o3 and the zro2 is short for L, and the plating sequence of the acid-resistant alkali metal and the metal oxide is LHLHLHLHLHL, and after the thickness of each layer of the acid-resistant alkali metal and the metal oxide is optimized, the thickness range is 10-150nm, so that the problems that the performance of a traditional material cannot reach an ideal level and the overall effect and the accuracy of equipment are reduced when the traditional glass code disc is in a working environment under high-intensity light or in a scene requiring high reflectivity are solved.