310 results about "Aluminum fluoride" patented technology

The invention discloses a passive radiation refrigeration coating and a preparation method thereof, and relates to the technical field of industrial coatings. Comprising a fluoroacrylate emulsion, hollow glass beads, nano titanium dioxide, flaky silicon dioxide aerogel powder, polytetrafluoroethylene micro powder, hydroxyl-terminated polydimethylsiloxane, a hydroxyl acrylic acid modified silane coupling agent, a super-hydrophobic modified fluorosilicone surface additive, nano cerium oxide, aluminum fluoride doped zinc oxide infrared enhancement powder and deionized water. The paint is prepared on the basis of the formula. According to the invention, a multi-scale spectrum regulation and control and surface self-cleaning system is constructed cooperatively, so that the synergistic effect of high reflection of a sunlight region and high emission of a middle infrared region is realized. The coating can maintain continuous passive refrigeration in a day and night period, the surface of the coating has self-cleaning capability and excellent ultraviolet aging resistance, and high reflectivity and high radiation emissivity can be maintained for a long time in a complex outdoor environment, so that the thermal management efficiency of buildings and equipment is remarkably improved.

The invention relates to the technical field of aluminum electrolyte recovery, in particular to a waste aluminum electrolyte resource utilization method. The waste aluminum electrolyte resource utilization method comprises the following steps that waste aluminum electrolyte and a reactant are subjected to a reaction in a closed container, a product obtained after the reaction is completed is washed in water, then first solid-liquid separation is carried out to obtain a solid, aluminum fluoride is obtained after drying, and aluminum fluoride is obtained after second solid-liquid separation is carried out. The reactant is selected from one or two of anhydrous aluminum chloride and polyaluminum chloride, and the reaction temperature is not lower than 200 DEG C. By utilizing the physical characteristic that the melting point of the reactant is higher than the boiling point, the reactant forms a solid phase-liquid phase-gas phase three-phase coexistence system in a closed space at the temperature higher than the melting point and the boiling point, so that the reactant can more efficiently perform molecular collision and mutual diffusion at an interface, thereby accelerating the reaction rate and improving the conversion rate.

The invention belongs to the technical field of battery material preparation, and particularly relates to a coated negative electrode material as well as a preparation method and application thereof. The coated negative electrode material comprises a porous carbon skeleton and a carbon coating layer coating the porous carbon skeleton, the porous carbon skeleton is provided with a plurality of holes; a silicon layer and a functional layer are attached to the surfaces of part of the holes; the silicon layer comprises silicon, the functional layer comprises a functional material, and the functional material comprises lithium aluminum fluoride. The coated negative electrode material provided by the invention has the properties of low expansion, high lithium ion conduction, few byproducts and the like, and is suitable for a solid battery; the battery energy density is ensured, and the problems that an effective lithium ion path cannot be formed due to contact failure of an active substance caused by high volume expansion of a silicon-based material in the circulation process and contact failure of the active material and a solid electrolyte in a solid-state battery, and performance degradation is caused by negative electrode side polarization increase in the circulation process are solved.

The invention discloses a polybenzimidazole modified ion exchange membrane as well as preparation and application thereof. The polybenzimidazole modified ion exchange membrane comprises a polybenzimidazole-containing porous base membrane, the surface of the porous base membrane is grafted with a sulfonic acid modified layer, and the outer surface of the sulfonic acid modified layer is coated with an aluminum fluoride layer. The preparation method of the membrane comprises the following steps: immersing a polybenzimidazole-based membrane into an ammonium acetate aqueous solution for reaction, taking out the base membrane after the reaction, and drying to obtain a pretreated base membrane; immersing the pretreated base membrane into a sulfonic acid group grafting solution, heating for reaction, cleaning the base membrane after the reaction, and drying to obtain a sulfonic acid modified base membrane; and immersing the sulfonic acid modified base membrane into an ethanol solution of aluminum fluoride for reaction, taking out the membrane after the reaction, cleaning and drying to obtain the membrane. The membrane can be used for assembling a flow battery. According to the invention, the problem that a sulfonic acid modified layer is incompatible with metal fluoride is overcome, and a proper combination of a sulfonating agent and metal fluoride is screened, so that the high-performance ion exchange membrane which can be used for a flow battery is successfully obtained.

The invention belongs to an aluminum fluoride production technology, and particularly relates to a process and a system for producing aluminum fluoride by matching with a low-grade fluorite dry method, fluorite powder and sulfuric acid are added into a pre-reactor to be uniformly mixed and then are guided into a reaction furnace to be heated, and when the reaction furnace rotates, a free spiral structure in the reaction furnace rotates to promote the reaction of the fluorite and the sulfuric acid; discharging the calcium sulfate through a discharging spoon at the discharging end of the reaction furnace, and collecting the hydrogen fluoride volatilized from the reaction furnace; volatilized hydrogen fluoride enters a pre-purification tower and is treated to obtain purified hydrogen fluoride gas, the purified hydrogen fluoride gas and dried aluminum hydroxide are added into a fluidized bed to react to obtain aluminum fluoride and tail gas, and the tail gas enters a tail gas recovery treatment system. The problems that low-grade fluorite is poor in resource utilization rate, prone to crusting in a reaction furnace, low in fluorine utilization rate and the like are solved.

The invention relates to a positive electrode material and a preparation method thereof, a positive electrode plate, a battery and an electric device. The positive electrode material comprises a positive electrode base material, a carbon coating layer and an aluminum fluoride coating layer, the positive electrode base material is coated with the carbon coating layer, and the carbon coating layer is coated with the aluminum fluoride coating layer; wherein the positive electrode base material is selected from lithium manganate; wherein the aluminum fluoride coating layer is a discontinuous coating layer. The positive electrode material has excellent high-temperature cycle performance and also has excellent rate capability and capacity.

The invention relates to the technical field of surface engineering, discloses a method and a system for preparing a yttrium fluoride composite ceramic coating through atmospheric plasma spraying, and aims to solve the problems that the yttrium fluoride coating generates a brittle aluminum fluoride layer on the surface of an aluminum substrate due to fluorine ion diffusion, so that the bonding strength is low, and the yttrium fluoride coating is easy to peel off and lose efficacy. The method comprises the following steps: sequentially carrying out mechanical polishing, ultrasonic cleaning and sand blasting roughening on an aluminum base material; preparing composite powder formed by mixing yttrium fluoride, yttrium oxide and nanometer aluminum oxide according to the mass ratio of 75: 20: 5; sequentially depositing a yttrium oxide transition layer, a composite barrier layer and a yttrium fluoride functional layer by adopting atmospheric plasma spraying; and finally carrying out vacuum post-heat treatment. According to the system, through the synergistic effect of the three layers of gradient structures, the transition layer forms an yttrium aluminate metallurgical bonding interface, the barrier layer inhibits fluorine ion diffusion through the dual mechanisms of nanometer aluminum oxide physical barrier and yttrium oxide chemical adsorption, and the functional layer guarantees the plasma erosion resistance. According to the method, the bonding strength of the coating is remarkably improved to 50 MPa or above, the porosity is lower than 3%, stripping is avoided under 500-hour high-energy plasma bombardment, the process cost is reduced by 40%, and the method is suitable for cavity protection of semiconductor etching equipment.

The invention discloses a lithium iron manganese phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries, the lithium iron manganese phosphate positive electrode material at least comprises lithium iron manganese phosphate particles and a coating layer coating the lithium iron manganese phosphate particles; the raw material of the coating layer comprises an aluminum fluoride embedded poly (ethylenedioxythiophene)-lithium polystyrene sulfonate compound. And the coating layer can be used as a physical barrier to form dynamic interface protection, so that dissolution of manganese and erosion of electrolyte are directly inhibited, and side reaction between the electrolyte and the positive electrode material is reduced. Meanwhile, a more flexible transmission channel is provided for lithium ions and electrons, the conductivity of the positive electrode material is enhanced while the transmission efficiency of the lithium ions is improved, and the lithium manganese iron phosphate positive electrode material with stable structure, high rate capability and cycling stability is obtained.

The invention relates to the field of packaging materials, and particularly discloses a degradable environment-friendly electric insulation plastic packaging bag and a preparation method thereof. The degradable environment-friendly electric insulation plastic packaging bag is prepared from the following raw materials in parts by weight: 100 parts of polylactic acid, 1-4 parts of organic zirconium phosphate, 2-5 parts of hydrophobic modified cellulose nanocrystals, 4-10 parts of polyimide / aluminum fluoride composite nanofibers, 1-3 parts of a dispersing agent, 1-4 parts of an antioxidant, 3-5 parts of inorganic filler, 1-3 parts of a slipping agent, 1-3 parts of an antistatic agent and 3-5 parts of a flame retardant. The packaging bag can be used for objects with high requirements for electrical insulation, has high electrical insulation capacity at high temperature, and is high in transparency and mechanical property.

The invention relates to the technical field of waste water circulation, in particular to a centrifugal waste water recycling device based on aluminum fluoride production, which comprises a shell, an impeller I and a screen drum, the impeller I is fixedly mounted in the screen drum, the screen drum is rotatably mounted in the shell, and a separation assembly is movably mounted in the shell. And the separation assembly comprises a discharging barrel and a rotating rod, the discharging barrel penetrates through the side wall of the shell and is fixedly connected with the shell, and a discharging conical barrel is fixedly installed below the screen drum. Precipitated particles are driven by a spiral plate to move towards a discharging opening, waste water is further screened, in the process that the particles are conveyed by the spiral plate, the particles are collected through a groove, the particles are prevented from being washed away by waste water, the groove abuts against a conical head, and a vibration rod drives a second scraping block and a first scraping block to knock and clean the inner wall of a discharging conical barrel. The particles are prevented from being attached to the interior of the discharging conical barrel, the screen barrel is cleaned through the spraying pipe from outside to inside, and screen holes of the screen barrel are prevented from being damaged.

The utility model discloses a fluidized bed for producing aluminum fluoride, which comprises a box body, the top and the side part of the box body are respectively provided with a feed port and an air inlet, and the air inlet is externally connected with an air inlet pipeline. A plurality of sets of rotatable conveying belts are arranged in an inner cavity of the box body in an up-down staggered mode. The device further comprises a bucket elevator, a feeding pipe and a discharging pipe are arranged on the upper side and the lower side of the bucket elevator respectively, and a backflow inlet is formed in the top of the box body. The utility model relates to the technical field of aluminum fluoride production, the fluidized bed for producing aluminum fluoride can prolong the contact reaction time of aluminum hydroxide particles and hydrogen fluoride gas in a limited space by arranging a plurality of conveyor belts which are distributed in a staggered manner, and further, the contact reaction time of the aluminum hydroxide particles and the hydrogen fluoride gas can be prolonged by arranging a bucket elevator. Aluminum hydroxide particles can circularly move on the conveying belt, so that the contact time of the aluminum hydroxide particles and hydrogen fluoride gas is greatly prolonged, and the preparation efficiency of aluminum fluoride can be fully ensured.

The invention discloses a modified lithium-rich manganese-based positive electrode material and a preparation method thereof, a pole piece and a battery, and the preparation method comprises the following steps: S1, mixing a lithium-rich manganese-based material with tungsten trioxide, and calcining for the first time to obtain an LRM-coated WO3 material; and S2, mixing the LRM-coated WO3 material with aluminum fluoride, and carrying out secondary calcination to obtain the modified lithium-rich manganese-based positive electrode material. According to the scheme, the modified lithium-rich manganese-based positive electrode material is prepared through combination of chemical bond regulation and phase structure design, the problem that the high-temperature performance of a traditional lithium-rich manganese-based material is degraded is solved, and a new thought is provided for development of a high-energy-density lithium ion battery.

The invention discloses an atomic layer deposition method and structure for an aluminum fluoride enhanced aluminum oxide passivation layer of a TOPCon solar cell. The method comprises the steps that after a boron-doped layer is formed on the front face of a crystal silicon wafer, a passivation layer is formed on the boron-doped layer through an atomic layer deposition technology, specifically, Al2O3 deposition circulation is conducted with trimethyl aluminum as an aluminum source and H2O as an oxygen source, AlF3 deposition circulation with aluminum chloride as the aluminum source and HF or NH4F as a fluorine source is periodically inserted, the proportion of the number of deposition circulation times of AlF3 to the number of deposition circulation times of Al2O3 is 1: (1-10), and the passivation layer is formed on the boron-doped layer through the atomic layer deposition technology. And an alternating layer structure with the total thickness of 5-10 nm is formed. According to the invention, an AlF3 layer is periodically inserted in an Al2O3 deposition cycle, so that an Al2O3 / AlF3 superlattice structure is formed. According to the structure, the interface passivation effect is remarkably improved, hydrogen atom overflow is reduced, and the ultraviolet aging resistance is enhanced. The method is compatible with an existing ALD production line, is suitable for high-efficiency TOPCon battery manufacturing, and has a good industrial application prospect.

The invention provides high-transparency rare earth doped fluoride glass and a preparation method thereof, and belongs to the technical field of glass. The calcium fluoride ensures high transparency and chemical stability, the magnesium fluoride improves the ultraviolet transmittance and the mechanical strength, and the barium fluoride optimizes the melting fluidity and the rare earth doping uniformity; aluminum fluoride is added to inhibit crystallization and enhance uniformity, the rare earth element realizes optical function regulation and control, and ammonium fluoride provides a fluorine source and reduces impurities; in a preparation link, quick lime is dedusted and then reacts with pure water in proportion, impurities in a calcium nitrate solution are removed by hydrogen peroxide, uniform growth of calcium carbonate crystal nucleuses is controlled by ammonia water and carbon dioxide, and calcium fluoride is synthesized by hydrofluoric acid in proportion and dried at low temperature after plate-frame pressure filtration and purification; after the raw materials are refined through ball milling, the melting temperature is controlled in stages, impurities, reaction integrity and a microstructure are accurately controlled in the whole process, and finally the high-transparency functional glass is prepared.

The embodiment of the invention provides a friction material composition, a brake lining, a preparation method of the brake lining, a brake and a vehicle. The friction material composition comprises the following raw materials in parts by weight: 2-10 parts of a fluoride mixture, 8-15 parts of graphite, 8-12 parts of phenolic resin, 4-12 parts of a metal oxide, 15-40 parts of a fiber material and 20-40 parts of other fillers, wherein the fluoride mixture comprises at least two of calcium fluoride, barium fluoride, cerium fluoride, aluminum fluoride, magnesium fluoride, potassium fluoride, sodium fluoride, beryllium fluoride and manganese fluoride. The brake lining prepared from the friction material composition can solve the problems of high wear rate and heat fading at the same time, the service life of the brake lining is prolonged, and the braking effect is improved.

The invention belongs to the technical field of iron runner castable, and discloses a multi-scale whisker reinforced and toughened cement-free combined iron runner castable and a preparation method of the multi-scale whisker reinforced and toughened cement-free combined iron runner castable. The raw materials of the non-cement-bonded castable for the iron hook comprise high-aluminum aggregate, silicon carbide aggregate, silicon carbide micro powder, aluminum oxide micro powder, a first binding agent, a second binding agent, a carbon source and an antioxidant, and explosion-proof fibers and water are additionally added, the first binding agent is prepared by heating silicon dioxide micro powder, graphite fine powder, polyvinyl alcohol, a silane coupling agent and water to react and then drying, and the second binding agent is prepared by mixing silicon dioxide micro powder, pseudo-boehmite micro powder, boric acid micro powder, acrylamide and aluminum fluoride micro powder. The silicon carbide whisker, the aluminum borate whisker and the mullite whisker are generated in different areas and at different temperatures in the iron runner castable through two binders with different components, so that multi-scale strengthening and toughening as well as improvement of oxidation resistance and erosion resistance are realized.

The invention discloses a flame-retardant polyvinyl chloride composite board and a processing method thereof, and relates to the technical field of polyvinyl chloride boards. The flame-retardant polyvinyl chloride board is prepared by adding a mullite whisker-metal organic framework composite material into a composite board matrix. Firstly, aluminum oxide, silicon dioxide and aluminum fluoride trihydrate are used for preparing mullite whiskers, and the mullite whiskers are single-crystal fibrous materials with many pores, large specific surface area, high temperature resistance and high strength. Preparing sol by using the mung bean polypeptide, and modifying the mullite whisker by using the sol to obtain the mullite whisker modified by the mung bean polypeptide. Zinc nitrate hexahydrate and dimethylimidazole are added to assist growth of a metal organic framework composite material on mullite whiskers, so that the strength and flame retardance of the flame-retardant polyvinyl chloride composite board are further improved.

The invention belongs to the technical field of aluminum electrolysis waste recovery treatment, and particularly relates to a comprehensive utilization method for aluminum electrolysis waste. The method comprises the following steps: after crushing the aluminum electrolysis waste, reacting the crushed aluminum electrolysis waste with an alkaline solution to generate a mixed solution containing a sodium metaaluminate component and filter residues A; washing the filter residue A for multiple times, and extracting a sodium fluoride saturated solution and a filter residue B; heating and evaporating the mixed solution to separate out sodium fluoride; the pH value of the solution is adjusted through carbon dioxide, and a high-purity aluminum hydroxide and sodium carbonate solution is prepared; separating the washed mixed solution by adopting an electrochemical method to obtain a hydrogen fluoride / ammonium fluoride solution and a sodium hydroxide / sodium carbonate / sodium bicarbonate solution; reacting the filter residue B with dilute acid to prepare a lithium-containing solution, purifying and concentrating, adding sodium carbonate to precipitate lithium to prepare a lithium carbonate product, and reacting aluminum hydroxide with hydrogen fluoride to prepare high-purity aluminum fluoride. According to the method, comprehensive recovery of the aluminum electrolysis waste is achieved, environmental pollution is effectively reduced, and the utilization rate of resources is increased.

The invention discloses a modification and grain refiner for Al-Si series die-casting aluminum alloy, which comprises the following components in mass percentage: 60-80% of rare earth aluminum alloy powder, 19-39% of auxiliary agent A, and 0.1-1.0% of auxiliary agent B; in the rare earth aluminum alloy powder, rare earth elements account for 2-20% of the total amount, the total amount of Fe and Si is ≤0.1%, and the balance is aluminum; the rare earth element is any one or a combination of two of La, Ce, Y, Er, and Sc; the auxiliary agent A comprises light calcium carbonate, sodium cryolite, potassium cryolite, sodium fluorosilicate, lithium fluoride, potassium fluoride, sodium fluoride, aluminum fluoride, sodium chloride, potassium chloride, potassium fluoroborate, magnesium chloride, and hexachloroethane; the auxiliary agent B comprises polyethylene glycol and stearamide. The modification and grain refiner obtained by mixing rare earth aluminum alloy powder, additive A and additive B can be evenly dispersed in the aluminum alloy melt to play the role of long-term modification and grain refinement as well as refining and dehydrogenation.

The aluminum fluoride coated nano silicon material is prepared from nano silicon powder, aluminum nitrate nonahydrate, ammonium fluoride, absolute ethyl alcohol and deionized water, and an aluminum fluoride coating layer and a nano silicon negative electrode material are compounded to form an aluminum fluoride coated nano silicon material structure. The aluminum fluoride coating layer on the surface can be converted into a fast ion conductor in the battery circulation process, so that the lithium ion diffusion rate is increased, and migration of lithium ions between the nanometer silicon negative electrode and the electrolyte is promoted. Under the coating protection effect of the coating layer, the volume expansion of the nano-silicon material is improved, the voltage attenuation speed is slowed down, the cycling stability is greatly improved, the cycling performance of the nano-silicon negative electrode material is improved, and silicon particle breakage, material pulverization and falling off from a pole piece are avoided. The coating amount of the aluminum fluoride coating layer is compared, and the optimal coating amount is given. The method has the advantages of low cost and high controllability.

The present invention provides a method for preparing large-sized aluminum fluoride products from aluminum electrolyte leaching solution, belonging to the technical field of aluminum electrolyte resource recovery. S1: Take the aluminum electrolyte leaching solution, and the molar ratio of F element to Al element in the aluminum electrolyte leaching solution is 1-2.5:1; S2: Heat the aluminum electrolyte leaching solution and add an alkali solution. When hydroxyaluminum fluoride precipitates in the aluminum electrolyte leaching solution, add crystal seeds and an organic surfactant, and continue to add the alkali solution to adjust the pH value to 2-7; stir and age, and then filter to obtain a filter cake and a filtrate; S3: Dry the filter cake, add ammonium bifluoride, mix well and then calcine to obtain aluminum fluoride products. The present invention provides a method for preparing large-sized aluminum fluoride products from aluminum electrolyte leaching solution, which solves the technical problems of too fine particle size and low purity of aluminum fluoride products in the prior art.

The invention discloses an electrolytic bath crust breaking and blanking control, fault detection alarm and intervention method, which comprises an electrolytic bath control machine, the electrolytic bath control machine is connected with a plurality of electrolytic baths, and an intelligent control system is connected in series between the electrolytic bath control machine and the electrolytic baths. And the intelligent control system comprises a shell surface pressing and penetrating control module, a shell surface pressing and non-penetrating control module in an abnormal state, a blanking system control module, a fault detection module, an execution intervention module and a process data acquisition and storage module. And invalid blanking and energy waste are remarkably reduced, meanwhile, the risks of covering material accumulation and hearth sediment are reduced, and the electrolytic reaction stability is improved. Manual inspection and abnormal working condition operation risks are reduced, potential safety hazards in high-temperature, strong-corrosion and strong-magnetic-field environments are reduced, the maintenance time is shortened through fault early warning, and the equipment reliability is improved.

A coating system includes a diffusion coating on a refractory metal or refractory metal alloy. The coating can be applied to a component such as a rocket engine component that includes a substrate including the refractory metal and is useful to protect the substrate from high temperature oxidation. The diffusion coating process employs an activator that includes a compound of the metal to be diffused into the surface of the substrate and is a vapor phase process in which the vapor includes metal from the activator and additional from the metal source being activated. Aluminum trifluoride can be used to activate an aluminum metal source to form an aluminide coating on a refractory metal-based alloy, such as a niobium alloy.

The invention discloses a process method for preparing aluminum fluoride by recovering electrolytic aluminum electrolyte, and relates to the technical field of waste material recovery. The invention relates to a process method for preparing aluminum fluoride by recovering electrolytic aluminum electrolyte. The preparation method comprises the following steps: firstly, grinding the carbon residue or electrolyte into powder, wherein the fineness is greater than 150 meshes; adding water into the powder, pulping, and adding a certain amount of aluminum sulfate or aluminum hydroxide; sulfuric acid is added for leaching under the stirring condition, the leaching temperature ranges from 70 DEG C to 100 DEG C, the leaching time ranges from 2 h to 5 h, and the pH of the leaching end point ranges from 1 to 2; adding water to dilute the filtrate, adding caustic soda flakes to adjust the pH value to 12-14 to remove impurities, and filtering out insoluble hydroxides to obtain a mixed salt solution of sodium fluoride and sodium metaaluminate; adding sulfuric acid into the mixed salt solution while stirring to adjust the pH value to 3-6, and reacting at the temperature of 60-100 DEG C for 2-5 hours to obtain aluminum fluoride slurry; and filtering and washing the slurry to obtain aluminum fluoride trihydrate, and calcining at 500-700 DEG C to obtain anhydrous aluminum fluoride with the purity of more than 95%. The method turns waste into wealth, recycles resources, and is short in process flow, low in cost and high in recovery rate.

A method for preparing an 18F-labeled imaging agent comprising a conjugate of a peptide having a binding specificity for programmed death ligand 1 (PD-L1) and a chelating moiety, and optionally a linker. In representative aspects, the 18F-labeled imaging agent is [18F]-DK222.

The invention relates to the field of aluminum electrolysis industrial solid waste resource recycling, in particular to a method for preparing regenerated aluminum fluoride from aluminum electrolysis fluorine-containing solid waste. The method comprises the following steps: crushing and grinding the fluorine-containing solid waste, and mixing the crushed and ground fluorine-containing solid waste with anhydrous aluminum sulfate, aluminum fluoride seed crystals and a carbonaceous additive; carrying out heating reaction on the mixture at 500-700 DEG C, washing with water, and filtering; and drying the filter cake to obtain a regenerated aluminum fluoride product. According to the method, the aluminum fluoride seed crystal is introduced to promote reaction conversion, the calcium sulfate byproduct is subjected to in-situ reduction removal by using the carbon additive, and the sodium is deeply removed through heat treatment and high-temperature distillation, so that the obtained regenerated aluminum fluoride product is high in purity and low in sodium and sulfur content, and can be directly reused in an electrolytic cell. According to the technical scheme, high-value utilization of the aluminum electrolysis fluorine-containing solid waste is achieved, and environmental and economic benefits are achieved.

The invention discloses a magnesium alloy micro-arc oxidation electrolyte which comprises sodium metaaluminate, sodium hydroxide, sodium fluoroaluminate, aluminum fluoride and glycerol. The content of sodium metaaluminate is 5-25 g / L, the content of sodium hydroxide is 1-3 g / L, the content of sodium fluoroaluminate is 0.3-0.7 g / L, the content of aluminum fluoride is 0.2-0.3 g / L, and the content of glycerol is 1 g / L. The magnesium alloy micro-arc oxidation electrolyte comprises potassium metaaluminate, potassium hydroxide, potassium fluoroaluminate, aluminum fluoride and glycerol, the content of potassium metaaluminate is 10-20 g / L, the content of potassium hydroxide is 3-5 g / L, the content of potassium fluoroaluminate is 0.5-0.7 g / L, the content of aluminum fluoride is 0.3-0.5 g / L, and the content of glycerol is 1 g / L. The invention further discloses the magnesium alloy hard ceramic membrane and a preparation method thereof. According to the preparation method of the magnesium alloy hard ceramic film, the components and the microstructure of the magnesium alloy micro-arc oxidation film layer are changed, and meanwhile the hardness and the corrosion resistance of the magnesium alloy micro-arc oxidation film layer are improved.

The present invention discloses a high thermal shock resistance ceramic material and a preparation method thereof, which comprise the following raw materials in parts by weight: 100 parts of alumina powder, 3 - 18 parts of pretreated mullite fiber, 2 - 8 parts of binder, 2 - 5 parts of dispersant, and 2 - 8 parts of mineralizer, wherein the mineralizer is composed of 1 - 4 parts of aluminum fluoride and 1 - 4 parts of magnesium fluoride. By pretreating the mullite fiber, a low-expansion composite fiber component is formed at high temperature, and a mineralizer is introduced to stabilize the fiber strength and structure at high temperature. The alumina composite granulated powder is prepared by a spray granulation process. The mullite fiber forms a network structure in the ceramic material and has a smaller thermal expansion coefficient, effectively absorbing thermal stress, so that the ceramic material does not crack when cooled to room temperature after heating and can withstand a higher temperature change, effectively improving the thermal shock resistance of the ceramic material. At the same time, the alumina powder as the main component ensures high hardness and strength, and the addition of the mullite fiber improves the toughness and impact resistance of the material.

The application provides a tantalum-based alloy and a preparation method thereof. The preparation method of the tantalum-based alloy comprises the following steps: sequentially laying a first mixed material, a second mixed material and magnesium chips in a reaction crucible in a top-down direction, igniting the reaction crucible to generate an aluminothermic reduction reaction, and then sequentially performing a temperature reduction treatment and a surface finishing treatment to obtain the tantalum-based alloy. The first mixed material comprises aluminum particles, tantalum pentoxide, titanium oxide, potassium chlorate and aluminum fluoride. The second mixed material comprises aluminum particles, tantalum pentoxide, titanium oxide, potassium chlorate, aluminum fluoride and calcium fluoride. By adopting double dosing and covering the magnesium chips with the upper material, the application improves the ignition efficiency, significantly improves the material loss caused by the slow ignition speed and insufficient ignition of the material in the traditional off-oven method, and introduces a titanium source to form an AlTaTi compound, thereby significantly enhancing the alloy uniformity.

The utility model discloses an aluminum fluoride crystal growing device which comprises a crystallizing tank and a stirring part, the stirring part is arranged in the crystallizing tank and provided with a rotating shaft rotationally arranged in the crystallizing tank, a fixed transmission rod is rotationally arranged in the rotating shaft, a supporting frame is fixedly arranged at the top of the crystallizing tank, and the supporting frame is fixedly connected with the crystallizing tank. The bottom of the supporting frame is fixedly connected with the top of the fixed transmission rod, a plurality of stirring rods are rotationally arranged on the outer side of the rotating shaft and meshed with the fixed transmission rod, and the rotating shaft rotates to drive the stirring rods to revolve around the fixed transmission rod so as to drive the stirring rods to rotate. By arranging the crystallizing tank and the stirring part, when aluminum fluoride mother liquor is stirred, the stirring rod rotationally arranged on the side surface of the rotating shaft is driven to revolve around the fixed transmission rod through the rotation of the rotating shaft, so that the fixed transmission rod drives the stirring rod to rotate, and a plurality of stirring centers are formed in the crystallizing tank; and the efficiency of separating out aluminum fluoride crystals from the aluminum fluoride mother liquor is improved.