58 results about "Tin Fluorides" patented technology

The invention relates to a corrosion-free soldering flux used for braze welding aluminium and aluminium alloy. Counted by weight percentage, the soldering flux used for braze welding the aluminium and aluminium alloy comprises the following components: 32.0-34.0 percent of cesium fluoride, 44.0-46.5 percent of aluminium fluoride, 20.5-23.5 percent of potassium fluoride, 0.5-2.5 percent of one, two or three materials selected from tin fluoride, zinc fluoride and lithium fluoride. The corrosion-free soldering flux of the invention has low melting point and better soldering performance.

The invention relates to a method for preparing dense fluoride ceramic films on a magnesium surface and a magnesium alloy surface and belongs to the technical field of metal surface treatment. The method comprises the following steps of: chemically passivating a magnesium alloy; preparing a single-pulse ceramic film; and preparing a double-pulse ceramic film. In a chemically passivating process, solution such as hydrofluoric acid, phosphoric acid, hydrogen fluoride amine and the like are used; the preparations of the single-pulse ceramic film and the double-pulse ceramic film are mainly performed in a fluoride electrolyte-containing system, wherein potassium fluoride (sodium) is taken as a main salt; phosphate is taken as an additive; and citrate or tartrate is taken as a main stabilizing agent. The fluoride ceramic film obtained by the method is complete and dense, has high hardness, is firmly combined with a substrate, can be separately used as a protective layer and can be prepared into a composite surface functional layer which has higher corrosion resistance, higher wearing resistance and high hardness after subsequent processing treatment. The overall process of the method has the advantages of simple flow, low equipment cost, environment friendliness and the like.

A process for removing fluoride from wastewater is presented. Calcium (or magnesium), sodium and aluminum reagents are added into a fluidized bed crystallizer to remove most of the fluoride in wastewater. The remaining fluoride is removed by aluminum hydroxide. Alternatively, two fluidized bed crystallizers are used in series to treat the fluoride-containing wastewater: in the first fluidized bed crystallizer, calcium (or magnesium), sodium and aluminum reagents are used to treat the wastewater which contains high concentrations of fluoride, so that the fluoride concentrations thereof are largely reduced. Then, in the second fluidized bed crystallizer, a calcium reagent is added to further remove fluoride therein.

The invention provides an interface protection structure and a preparation method thereof and a battery comprising the interface protection structure. The interface protection structure comprises a metal fluoride and a binder. The metal fluoride is one or more of nickel fluoride, manganese fluoride, iron fluoride, titanium fluoride, copper fluoride, tin fluoride, and the like. The structure can form a protective layer containing lithium fluoride during the cycle process of lithium metal batteries to protect lithium metal electrodes. The interface protection structure is prepared by the following method: (1) providing a mixed slurry comprising a metal fluoride, a binder, a solvent and/or a carbon material; (2) coating one side of a diaphragm with the mixed slurry to obtain a diaphragm containing a first coating; and (3) baking the diaphragm containing the first coating to obtain the interface protection structure.

The invention relates to a method for preparing a rare-earth dysprosium alloy by molten salt electrolysis. The method is characterized by comprising the following steps: adding a mixture of a rare earth oxide and a dysprosium oxide as an electrolytic material in a fluoride molten salt system to carry out electrolysis production, wherein the fluoride molten salt system adopts a ternary system of 90-80% of rare earth fluoride, 7-10% of dysprosium fluoride and 3-10% of lithium fluoride by weight percent; the weight percent ratio of the rare earth oxide to the dysprosium oxide in the raw material mixture is (95-80):(5-20); and the electrolyzing temperature is 1030+/-30 DEG C; carrying out electrolysis by adopting a plug or bottom cathode method when the cathode current density is 6.0+/-2.0A/cm<2>, the anode current density is 1.3+/-1.0A/cm<2> and the cell voltage is 5-10V; and depositing the rare-earth dysprosium alloy near the cathode. The method has the advantages that the problems of complicated process, serious environmental pollution, high production cost and the like of the related technique at present are effectively overcome, the prepared alloy ingredient is even, and the method is suitable for production of a large electrolytic cell of over 10,000A.

A non-corrosion solder for the HF induced pressure soldering between stainless steel and aluminum contains the eutecticevaporate of potassium tetrafluoroaluminate and potassium hexafluoroaluminate (42-97 Wt%), lithium fluoride (0.5-8.5), Zinc fluoride (0.5-4.5), silicon powder and/or potassium pluorosilicate (2-4.5), nickel fluoride (0-3), cesium fluoride or cesium fluoroaluminate (0-3), copper fluoride (0-0.3), tin fluoride (0-0.5) and cadmium fluoride (0-3.5).

A flux of a welding aluminum and aluminum alloy relates to a brazing material. The aluminum alloy-aluminum alloy and the aluminium-aluminium alloy brazing flux of the invention is calculated by the mass percentage, with eutectic AIF3-CsF flux ranging from 97.0 to 99.9, zinc fluoride ranging from 0.1 to 3.0, tin fluoride ranging from 0 to 0.5. The invention is the flux for the aluminum alloy-aluminum alloy and the aluminium-aluminium alloy with high tensile strength.

The invention discloses a preparation method of rare earth ion doped tungsten oxygen fluoride silicate up-converted luminescent glass. The preparation method comprises the steps of: firstly, uniformly mixing silicon dioxide, germanium dioxide, aluminum oxide, tungsten oxide, calcium fluoride, titanium dioxide and rare earth oxide in a mortar; and then preparing the Er<3+>-Yb<3+> rare earth ions doped tungsten oxygen fluoride silicate up-converted luminescent glass by adopting a high-temperature melting annealing method. The method disclosed by the invention is simple in preparation method, low in raw material cost and simple in required device without a special device; and the overall preparation process is carried out in air atmosphere. According to the invention, tungsten oxide is introduced into an oxygen fluoride silicate glass substrate for the first time, and the further solution of the problems that the oxygen fluoride silicate glass is poor in chemical stability and mechanical strength after tungsten oxide is introduced is facilitated, so that the glass product has the advantages of low phonon energy of fluoride and good crystallization stability of oxide, thereby obtaining strong up-converted red and green light output visible to naked eyes.

The invention provides a method for recycling metal in tungsten carbide waste through fluoride electrolysis. The method is characterized in that the tungsten carbide waste is taken as an anode; high-temperature fluoride is taken as electrolyte; the high-temperature fluoride is one or more of NaF, KF, MgF2, RbF and CaF2; and the tungsten carbide waste is WC alloy waste or WC alloy waste containing Co with mass fraction being 2-20%. According to the method provided by the invention, a fluoride molten salt system has the characteristics of a relatively high electrochemical window at a high temperature, relatively great ionic conductivity, a relatively low molten salt loss rate and relatively strong corrosion; the fluoride molten salt system is taken as a molten salt dielectric medium, so that electrochemical activities, at a high temperature, of WC waste and a waste hard alloy are improved, and therefore, electrochemical dissolution speed of WC waste and the waste hard alloy is quickened.

The present invention relates to a brazing flux for brazing metal, its composition includes (wt%) KAlF4+K3AlF6 cocrystal body 95.0-97.5, zinc fluoride 1.5-4.0, copper fluoride 0.2-0.5, tin fluoride 0.6-1.5 and cadmium fluoride 0.1-0.5. Said brazing flux is used for brazing stainless iron-aluminium.

The invention provides a two-step method for preparing high-purity titanium, and relates to the field of electrochemical metallurgy. The two-step method includes the two steps of preparation of low-valence TiOx (x<1) and extraction of high-purity titanium. Firstly, a TiOx (x<1) raw material is prepared with graphite or an inert electrode as the anode and a metal material as a cathode in an electrolyte system with oxides (TiO2+MgO+Al2O3+CaO) and a small quantity of fluorides as additives; and then in a chloride electrolyte system, high-purity titanium is extracted through fused salt with TiOx as the anode and a metal material as a cathode, and in the process, free-state [O] generated in an electrolyte can further oxide residual low-valence TiOx into high-valence TiO2 which returns to the first step to serve as an oxide titanium ion source raw material. The novel two-step method for extracting high-purity titanium through fused salt has the characteristics that the technique is simple, energy consumption is low and the titanium recovery rate is high, and can achieve industrial extraction of high-purity titanium.

The present invention provides an electrolytic synthesis method of nitrogen trifluoride, comprising electrolytically synthesizing nitrogen trifluoride gas from ammonium fluoride in an ammonium fluoride-containing molten salt mixture using a carbonaceous electrode as an anode, wherein the method comprises: a step of dissolving, in the molten salt mixture, metal ions capable of electrolytically yielding a highly oxidized metal fluoride through reaction with fluorine radicals (F.) that are generated upon the discharge of fluoride ions which are a component of the ammonium fluoride, thereby reacting the metal ions with the fluorine radicals (F.) to yield the highly oxidized metal fluoride, and reacting the highly oxidized metal fluoride with ammonium ions on a surface of the electrode and in a solution to synthesize nitrogen trifluoride gas.

A tooth varnish that is free from pinus extracts, free of substantial undesired coloring agents, with a reduced viscosity, delivered in a user-friendly, flow-through, unit dose applicator and having improved fluoride release, uptake, and remineralization properties.

The invention provides multi-color epoxy boat topping paint and belongs to the technical field of chemical coating preparation. The paint comprises 50-60 parts of epoxy resin, 1-2 parts of organic soil, 18-23 parts of precipitated barium sulphate, 6-8 parts of dimethylbenzene, 1-2 parts of butanol, 1-2 parts of amino resin, 5-7 parts of chlorinated rubber latex, 2-4 parts of tributyl tin fluoride, 3-5 parts of zinc oxide, 4-6 parts of urea, 2-4 parts of modified asphalt, 2-4 parts of sodium silicate, 5-7 parts of methyl isobutyl ketone, 8-10 parts of pigments, 2-6 parts of anti-settling agents and 60-70 parts of deionized water. The multi-color epoxy boat topping paint has the beneficial effects that the technical process is simple, the ratio of raw materials is reasonable, the coating can prevent attachment and reproduction of marine microorganisms, the paint is not polluted by microorganisms, and a good effect can be achieved by using the multi-color epoxy boat topping paint and common boat topping paint at the same time. The chlorinated rubber boat topping paint has the identification function as the common boat topping paint and meanwhile has an antifouling function. The multi-color epoxy boat topping paint is wide in adaptability, environmentally friendly, free of toxin, efficient, high in market value and convenient to use and popularize.

The invention relates to a bonding agent used between an oral implant and an upper prosthesis, which comprises a powder agent and a liquid agent. In the powder agent, ultrafine fully vulcanized powder rubber or plastic shock resistant modifier MBS or processing modifier ACR is prepared by respectively mixing organic resin, padding, a reducing agent and other auxiliary components or blending powder prepared from zinc oxide, magnesium oxide, calcium fluoride, tin fluoride and aluminum oxide (trace). The liquid agent comprises a resin substrate, an adhesive monomer, a thinning agent, an oxidizing agent, a polymerization inhibitor or polyacrylic acid, and the balance water, wherein the mass fraction of polyacrylic is 30%-48%. The using process comprises the following steps: weighing the powder and the liquid according to the proportion of 1:1, uniformly mixing the powder and the liquid into paste, and curing the paste for 3-5 minutes under the condition of room temperature.

The invention provides a method for synthesizing diphenyl through Stille reaction recycling with an organotin compound, and relates to a method for preparing diphenyl through a Stille reaction. A purpose of the present invention is to solve the problem of low organotin utilization rate of the existing Stille method for preparing the diphenyl compound. The method comprises: 1, adopting tri-butyltin chloride and bromobenzene as raw materials, and carrying out a reaction under the effect of a Grignard reagent to synthesize tributylphenyltin; 2, carrying out a reaction of a mixed solution of halogenated benzene, tributylphenyltin, cuprous iodide, lithium chloride, palladium(triphenylphosphine)dichloride and cesium fluoride DMF to prepare diphenyl, and collecting the filter residue; 3, dissolving the filter residue with acetone, dissolving the insoluble matter with absolute alcohol, and concentrating to obtain fluorotributyltin; and 4, converting the tin fluoride into the organic tin chloride with saturated ammonium chloride tetrahydrofuran. According to the present invention, the synthesis process conditions are optimized, the highest yield of the diphenyl compound achieves 97%, and the effective separation utilization of the organic tin chloride is achieved.

The invention discloses a method for preparing high-purity lithium fluoride and lithium hexafluorophosphate by the utilization of organo tin fluoride. As for preparation of lithium fluoride, a fluorine/halogen exchange reaction between lithium halide and organo tin fluoride is carried out to generate lithium fluoride. As for preparation of lithium hexafluorophosphate, a fluorine/halogen exchange reaction between phosphorus pentahalide and organo tin fluoride is firstly carried out to generate phosphorus pentafluoride, and a contact reaction between phosphorus pentafluoride and lithium fluoride is carried out to generate lithium hexafluorophosphate; or, lithium halide and phosphorus pentahalide are firstly dissolved in an organic solvent until a clear intermediate solution, and then the intermediate solution reacts with organo tin fluoride to generate lithium hexafluorophosphate, wherein lithium halide is lithium chloride or lithium bromide. The lithium fluoride prepared in the invention has high purity. Meanwhile, adoption of highly corrosive HF as a fluorinated reagent is avoided so as to avoid the possibility of introducing impurities and guarantee that high-quality LiPF6 can be prepared in the next step.