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Tin is a chemical element with the symbol Sn (from Latin: stannum) and atomic number 50. Tin is a silvery metal that characteristically has a faint yellow hue. Tin, like indium, is soft enough to be cut without much force. When a bar of tin is bent, the so-called tin cry can be heard as a result of sliding tin crystals reforming; this trait is shared by indium, cadmium, and frozen mercury. Pure tin after solidifying keeps a mirror-like appearance similar to most metals. However, in most tin alloys (such as pewter) the metal solidifies with a dull gray color. Tin is a post-transition metal in group 14 of the periodic table of elements. It is obtained chiefly from the mineral cassiterite, which contains stannic oxide, SnO₂. Tin shows a chemical similarity to both of its neighbors in group 14, germanium and lead, and has two main oxidation states, +2 and the slightly more stable +4. Tin is the 49th most abundant element on Earth and has, with 10 stable isotopes, the largest number of stable isotopes in the periodic table, thanks to its magic number of protons. It has two main allotropes: at room temperature, the stable allotrope is β-tin, a silvery-white, malleable metal, but at low temperatures, it transforms into the less dense grey α-tin, which has the diamond cubic structure. Metallic tin does not easily oxidize in air.
Low-cost high-stability Ti / IrO2-SnO2-SbO2 gradient active coating anode and preparation process
PendingCN120945431ARuthenium/rhodium/palladium/osmium/iridium/platinum oxides/hydroxidesAntimony oxides/hydroxides/oxyacidsIridiumPhysical chemistry
The invention discloses a Ti / IrO2-SnO2-SbO2 gradient active coating anode with low cost and high stability and a preparation process of the Ti / IrO2-SnO2-SbO2 gradient active coating anode. The gradient active coating is characterized in that the gradient active coating is composed of 3-5 layers, the total thickness is 5-15 microns, the thickness of each layer is 1-5 microns, the molar percentage content of iridium in a bottom layer is 0-5%, the sum of the molar percentage content of tin and antimony is 95-100%, the molar percentage content of iridium in a surface layer is 10-20%, the sum of the molar percentage content of tin and antimony is 80-90%, and the thickness of each layer is 1-5 microns. The molar percentage content of iridium from the bottom layer to the surface layer is sequentially increased from 2% to 10%, the molar percentage content of tin and antimony is sequentially reduced from 2% to 10%, and the total iridium loading amount in the gradient active coating is 0.05-0.2 mg / cm < 2 >. The preparation method comprises the three steps of titanium substrate pretreatment, precursor salt alcohol solution preparation and gradient active coating preparation. By adopting a gradient coating mode, the thermal stress between the coating and the titanium substrate in the preparation process is remarkably reduced, the consumption of noble metal is reduced, the oxygen evolution activity of the anode is improved, and the service life of the anode is prolonged. The method is simple to operate and low in cost, and has remarkable industrialization advantages.
Owner:DALIAN UNIV OF TECH +1
Tin-based alloy preformed soldering lug and preparation method thereof
The invention discloses a tin-based alloy preformed soldering lug and a preparation method thereof.The preparation method comprises the following steps that a copper fiber reinforced framework with gradient density distribution is prepared, the copper fiber reinforced framework comprises a high-density area and a low-density area, and hollowed-out gaps are formed through a weaving technology; tin-based slurry with different components and functions is prepared from outer-layer slurry with tin-antimony-copper-nickel as a main body, middle-layer slurry with tin-antimony-copper as a base body and inner-layer slurry with tin-antimony-copper rare earth as a base body, the three kinds of tin-based slurry are sequentially filled into preset areas of hollow-out gaps of a reinforced framework, and a gradient structure material is formed; the gradient structure material is subjected to press-fit forming and post-treatment, and a preformed soldering lug is obtained; a framework is firstly built, then materials are filled, and copper fibers in the soldering lugs provide good support and heat conduction channels, so that a gradient transition structure with continuous change of components and performance is realized, and the integrity, the impact resistance and the bonding strength of the materials are greatly enhanced.
Owner:SHENZHEN XINGHONGTAI TIN
Method for improving performance of rare earth permanent magnet sintered neodymium iron boron grain boundary diffusion
PendingCN121812351AMagnetic materialsInductances/transformers/magnets manufactureRare-earth elementTempering
The invention discloses a method for improving performance of rare earth permanent magnet sintered neodymium iron boron grain boundary diffusion, and belongs to the technical field of rare earth permanent magnet materials. The method comprises the steps that a low-melting-point metal layer and a diffusion layer containing heavy rare earth elements are sequentially formed on the surface of a clean sintered neodymium-iron-boron magnet, and then vacuum diffusion heat treatment and tempering treatment are conducted. Wherein the low-melting-point metal layer comprises at least one of copper, aluminum, gallium and tin or an alloy of the copper, the aluminum, the gallium and the tin; the heavy rare earth element comprises at least one of dysprosium, terbium, holmium and gadolinium. The low-melting-point metal layer is preferentially diffused and wets the grain boundary in the heat treatment process, heavy rare earth elements are promoted to be deeply and uniformly diffused towards the interior of the magnet along the grain boundary, so that a heavy rare earth-rich shell layer is formed outside main phase grains of the magnet, and the intrinsic coercive force is improved; meanwhile, the low-melting-point metal forms a strengthening phase at the grain boundary, the brittleness of the magnet after diffusion is improved, the surface corrosion phenomenon is restrained, and collaborative optimization of the comprehensive performance of the magnet is achieved.
Owner:NINGBO LIANDE PERMANENT MAGNET TECHNOLOGY CO LTD
Solder low-temperature brazing material with silver coating
The invention discloses a material with a silver coating for low-temperature brazing of brazing filler metal, and particularly relates to the field of brazing welding, which comprises the following steps: silver amalgam paste is prepared by oscillating and mixing silver powder and mercury according to the mass ratio of 1: 9-0.5: 9.5 in a manner and method for plating silver on the surface of base metal (metal, semiconductor, ceramic or glass); when brazing is carried out, the surface of the silver plating layer of the to-be-welded piece is coated with brazing filler metal, and then heating and pressurizing are carried out in a low-temperature interval of 120-350 DEG C in a vacuum, protective atmosphere or atmospheric environment to complete connection. According to the method, the amalgam reaction and isothermal solidification principles are utilized, a tough welding spot mainly comprising a silver-based solid solution is finally formed, generation of a large number of brittle intermetallic compounds is avoided, a connector has high strength, high reliability and excellent thermal fatigue resistance, and therefore the problems that gold-tin brazing filler metal is high in cost, the brittleness of the welding spot is large, and the welding temperature is high are successfully solved.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Method for separating valuable metal in waste photovoltaic welding strip through reduction smelting-vacuum gasification-vulcanization
The invention discloses a method for separating valuable metal in a waste photovoltaic welding strip through reduction smelting-vacuum gasification-vulcanization, and belongs to the technical field of resource recycling. The method comprises the steps that the waste photovoltaic welding strip is placed in a reducing atmosphere and heated for reduction smelting, so that carbon impurities on the surface of the waste photovoltaic welding strip are removed, tin, lead, silver and copper oxides on the surface are reduced, and a copper-tin-lead-silver alloy is obtained; then, heating the decarbonized and deoxidized photovoltaic welding strip under a vacuum condition, and carrying out vacuum gasification separation to obtain condensed metal lead and a copper-tin-silver alloy; and finally, sulfur is added into the copper-tin-silver alloy for vacuum vulcanization-separation, and volatile matter stannous sulfide and residual copper-silver alloy are obtained. According to the method, valuable metals in the waste photovoltaic solder strip can be efficiently separated, and the method has the advantages of being green and economical.
Owner:KUNMING UNIV OF SCI & TECH
Steel sheet having excellent bendability and high strength press hardened
PendingCN121250246AFurnace typesMetallic material coating processesChemical compositionHardened steel
A steel sheet having a chemical composition comprising, in weight%, C: 0.2% to 0.4%, Mn: 0.8% to 2.0%, Si: 0.1% to 0.5%, Al: 0.01% to 0.1%, Ti: 0.01% to 0.1%, B: 0.0005% to 0.005%, P < = 0.040%, Ca < = 0.01%, S < = 0.006%, N < = 0.01%, the steel sheet comprising, from the main body to the surface of the coated steel sheet, the main body and a surface layer occupying 10% of the outermost thickness on both sides of the main body, the top of such a body is a skin layer occupying 10% of the thickness of the outermost surface on both sides of the body, the density of TiN / Ti (C, N) inclusions in the skin layer being less than 240 particles / mm2, and the clustering index of MnS inclusions in the skin layer being less than 110 [mu] m / mm2. This allows the production of a hot-pressed part having a tensile strength equal to or greater than 1300 MPa and a bending angle strictly greater than 48 degrees standardized to 1.5 mm and measured in the transverse direction.
Owner:VALIN ARCELORMITTAL AUTOMOTIVE STEEL CO LTD +1
Steel sheet and high-strength press-hardened steel component having excellent bending anisotropy, and method for manufacturing same
PendingCN121204554AFurnace typesMetallic material coating processesChemical compositionHardened steel
A steel sheet having a chemical composition comprising, in% by weight, C: 0.2% to 0.4%, Mn: 0.8% to 2.0%, Si: 0.1% to 0.5%, Al: 0.01% to 0.1%, Ti: 0.01% to 0.1%, B: 0.0005% to 0.005%, P < = 0.040%, Ca < = 0.01%, S < = 0.006%, N < = 0.01%, the steel sheet comprising, from the body to the surface of the coated steel sheet, a body comprising a population of inclusions, where MnS and TiN / Ti (C, Si) (C, Mn), S < = 0.006%, N < = 0.01%, and a skin layer occupying the outermost 10% thickness on both sides of the body. N) the sum of clustering indexes of inclusions is less than or equal to 300 [mu] m / mm < 2 >. This allows the manufacture of a hot-pressed part having a tensile strength equal to or greater than 1300 MPa and a bending anisotropy equal to or less than 7 DEG.
Owner:VALIN ARCELORMITTAL AUTOMOTIVE STEEL CO LTD +1
Method for recycling high-value components of solder strip in retired crystalline silicon photovoltaic module
PendingCN121222782ASolid waste disposalCleaning using liquidsMaterials processingCrystalline silicon
The invention discloses a method for recycling high-value components of a solder strip in a decommissioned crystalline silicon photovoltaic module, belongs to the field of decommissioned photovoltaic material treatment and resource recycling, and the novel method for recycling the solder strip is efficient and has large-scale application potential. The recovery method comprises the steps that firstly, the surface of the welding strip is cleaned through alkali solution pretreatment, then a lead-tin coating on the surface of the welding strip is oxidized through a method of heat treatment in air, then the welding strip is soaked in an acid solution to remove surface oxides, then recovered solid products are washed with water and dried, and high-value components in the waste welding strip can be obtained. And further purifying and recycling. The method solves the problems of tedious operation method, low efficiency and the like during treatment of a traditional method. And meanwhile, the recovery route has a simple and convenient operation process, has large-scale application potential, and provides a large-scale application technical route and feasibility for recovery of the welding strip in the waste crystalline silicon photovoltaic module.
Owner:NANKAI UNIV
Beneficiation method of tin-silver symbiotic polymetallic ore and application thereof
The invention discloses a beneficiation method for tin-silver symbiotic polymetallic ore and application of the beneficiation method, and relates to the technical field of mineral separation. Comprising the steps that after tin-silver symbiotic polymetallic ore is ground, undersize minerals are obtained through a high-frequency screen, silver-copper flotation is conducted on the undersize minerals, and silver-copper concentrate and silver-copper tailings are obtained; the silver-copper tailings are subjected to lead-zinc-sulfur flotation, and lead concentrate and zinc-sulfur tailings are obtained; and the zinc-sulfur tailings are subjected to zinc-sulfur flotation, and zinc-sulfur concentrate and tin-sulfur tailings are obtained. The concentration of ore pulp in the ore grinding process is controlled, it is guaranteed that cassiterite and sulfide minerals are fully dissociated, then a first inhibitor is added in the lead-zinc-sulfur flotation process, the valuable metal recovery efficiency can be enhanced by optimizing the flotation process and collaboratively innovating a reagent formula according to the complex characteristics of tin-silver symbiotic polymetallic ore, and the recovery rate of the tin-silver symbiotic polymetallic ore is increased. The contents of silver, copper and tin in the tailings are obviously reduced, and efficient utilization of resources and reduction of solid wastes are realized.
Owner:GUANGXI GAOFENG MINE IND +1
Preparation method of tin-based babbitt alloy based on laser cladding
The invention belongs to the technical field of powder metallurgy, and provides a laser cladding-based tin-based babbitt metal preparation method which comprises the following steps: preparing a tin-based babbitt metal by adopting laser cladding to obtain a tin-based babbitt metal with determined process parameters; carrying out an orthogonal experiment under the condition of determining the process parameters, and determining the optimal process parameters; and the tin-based babbitt metal is prepared under the condition of optimal process parameters, and the preparation is completed by determining the lap joint rate. By determining the optimal process parameters of the laser power, the scanning rate and the lap joint rate, the tin-based babbitt metal is suitable for laser deposition forming and repairing.
Owner:ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
Soldering tin temperature closed-loop control method and system based on infrared temperature measurement feedback
ActiveCN121300545AAuxillary controllers with auxillary heating devicesHeating appliancesLoop controlEmissivity
The invention relates to the technical field of infrared temperature measurement, provides a soldering tin temperature closed-loop control method and system based on infrared temperature measurement feedback, and solves the problems that a temperature measurement result of a phase change critical region seriously deviates from a true value, and temperature measurement is not accurate due to the fact that material state changes are not considered. According to the method, the environment temperature of a welding area and the initial temperature measurement value of soldering tin in the welding process are detected, and soldering tin phase change emissivity data are obtained; the real-time state of soldering tin is determined, and the soldering tin temperature after calibration is obtained by combining the soldering tin phase change emissivity data and the environment temperature; comparing the calibrated soldering tin temperature with the phase change temperature interval to obtain a temperature comparison result, and combining the temperature comparison result with the calibrated soldering tin temperature to obtain an adjusted heating power parameter; and the soldering tin heating device is controlled to heat soldering tin according to the adjusted heating power parameters until the calibrated soldering tin temperature within the preset target temperature range is obtained, high-precision real-time calibration and dynamic closed-loop regulation and control over the soldering tin temperature are achieved, and it is ensured that the welding process is stably within the target temperature range.
Owner:CHINA RAILWAY ELECTRIFICATION ENGINEERING GROUP CO LTD +1
Lead-free halogen-free soldering paste and preparation process thereof
The invention relates to a lead-free and halogen-free soldering paste and a preparation process thereof, and belongs to the technical field of soldering paste production, through the combination of nano-silver-loaded carbon nanotubes, organically coated solder alloy powder and soldering flux, the surface tension of the lead-free and halogen-free soldering paste can be reduced by carbon nanotube surface carboxyl in the nano-silver-loaded carbon nanotubes, so that the lead-free and halogen-free soldering paste is obtained. Nano-silver and tin form an Ag3Sn strengthening phase which synergistically promotes wetting and spreading of the solder on a substrate, meanwhile, the carbon nanotubes loaded with the nano-silver are uniformly dispersed in the soldering paste to play a dispersion strengthening role, and the brittleness caused by bismuth segregation is effectively inhibited in cooperation with the grain refinement effect of copper and indium in the solder alloy powder; and the organic coating layer hydrogenated rosin-terpene resin and the soldering flux alcohol ether solvent form a slight dissolution-fusion effect, so that the welding flux alloy powder is prevented from being oxidized, an organic acid active agent can be released to remove a substrate oxidation film, the metallurgical bonding quality of a welding interface is further guaranteed, and the defects of pseudo soldering, cavities and the like are reduced.
Owner:SHENZHEN KEWEI TIN CO LTD
Centralized recovery treatment process for nitric acid type system tin stripping liquid
The invention discloses a nitric acid type system tin stripping liquid centralized recovery treatment process which comprises the following steps: firstly, adding a cationic coagulant into a nitric acid type tin stripping waste liquid, filtering through a 5-micron filter membrane, discharging into a reaction kettle, and adding a H2O2 solution with the concentration of 5-10%; the pH is adjusted to 2.0-2.5, and copper is removed under the condition of 40-50 DEG C; when the pH value is increased from 2.5 to 3.0-3.5, iron is removed; adjusting the pH value to 13.0-13.5, heating to remove aluminum, and separating to obtain a filtrate containing Na2SnO3; adjusting the pH value of the filtrate to 6.0-6.5, heating to 70-75 DEG C for reaction, and then carrying out gradient cooling to room temperature to generate Sn (OH) 4 precipitate; and centrifugally separating the mixed solution to obtain a tin-containing solid and a tin stripping regenerated solution, and firing the tin-containing solid to obtain a tin dioxide solid. Compared with a traditional process, copper is removed firstly, then iron is removed, aluminum is finally removed, and directional removal is achieved through the difference of precipitation conditions.
Owner:SHENZHEN JUNZE ENVIRONMENTAL PROTECTION CO LTD
Electroplating solution and electroplating method for preparing antimony-containing tin-based alloy packaging bump structure
The invention provides an electroplating solution and an electroplating method for preparing an antimony-containing tin-based alloy packaging bump structure. The content of antimony atoms in the bump structure is 0.1-8.0%; the electroplating liquid comprises tin (II), antimony (III), an inhibitor, methanesulfonic acid and an antioxidant; the concentrations of the tin (II), the antimony (III), the inhibitor, the methanesulfonic acid and the antioxidant in the electroplating solution are 15-60 g / L, 0.01-8.0 g / L, 0.5-15.0 g / L, 20-200 mL / L and 1.0-3.0 g / L in sequence. The electroplating solution can effectively realize co-deposition of tin ions and antimony ions, and the situation that the deposition rate is not matched in the deposition process due to the electrochemical characteristic difference of tin and antimony is overcome; the content of antimony atoms in the generated bump structure is 0.1-8.0%, and a small amount of metal antimony is added into a tin base, so that grains can be refined, the crystal face of a plating layer can be promoted to obtain excellent surface flatness, and the hardness of the plating layer can be effectively improved.
Owner:XIAMEN UNIV
Copper-tin-silver-zirconium alloy wire containing composite rare earth elements and continuous preparation process of copper-tin-silver-zirconium alloy wire
The alloy wire comprises the following components in percentage by mass: 0.1 to 6.0 weight percent of Sn, 0.1 to 0.3 weight percent of Ag, 0.01 to 0.20 weight percent of Zr, 0.02 to 1.00 weight percent of Y, 0.02 to 2.00 weight percent of Ce, 0.01 to 0.80 weight percent of Eu, 0.01 to 0.50 weight percent of Rb, Y / (Ce + Eu + Rb) is more than or equal to 0.8 and less than or equal to 1.2, and the balance of Cu and inevitable impurities of which the total amount is less than or equal to 0.05 weight percent. According to the invention, Ag and Zr are added into the copper-tin alloy wire in component design, and composite rare earth elements are also added, so that the addition amount of each rare earth element is limited, and in order to further improve the processability and comprehensive performance of the alloy wire, the addition amount of each rare earth element is limited; and finally, the preparation process of vacuum melting-continuous casting technology-multi-pass drawing combined with on-line dynamic annealing process treatment is combined, so that work hardening and internal stress of the wire are eliminated, the machining precision, plasticity and conductivity of the wire are improved, the material performance is more uniform, and the subsequent deformation or cracking risk in use is reduced.
Owner:SHENYANG INST OF ENG
Ag-Ti soldering paste for ceramic copper-clad plate as well as preparation method and application method of Ag-Ti soldering paste
Solid powder and an organic carrier are matched according to the mass ratio of (82-86): (14-18), silver powder and titanium dihydride powder which form the solid powder are matched according to the mass ratio of 96: 4, and a solvent, a thickening agent and a dispersing agent which form the organic carrier are matched according to the mass ratio of (91-95): (2-6): (1-5). According to the Ag-Ti soldering paste, silver powder and titanium dihydride powder serve as solid phases and are matched with a specific organic carrier, by optimizing the rheological property and the vacuum brazing technology, TiH2 is decomposed to generate active Ti atoms, the active Ti atoms react with AlN ceramic to generate a continuous TiN reaction layer, and high-strength and low-defect connection of an AlN ceramic base material and an oxygen-free copper metal copper layer is achieved; a traditional Cu element is abandoned in a soldering paste system, generation of a brittle phase is avoided, and the reliability of a connector under the extreme working condition is improved; when applied to preparation of the ceramic copper-clad plate, the film has the advantages of strong silk-screen printing adaptability, uniform film thickness and low voidage.
Owner:INST OF MATERIALS HENAN ACAD OF SCI
High-purity tin composition, methods for storing and producing the same, and tin hydrolysate, tin hydrolysate solution, and tin hydrolysate thin film using the same
PendingUS20250388610A1Tin organic compoundsPhotosensitive materials for photomechanical apparatusHydrolysatePhysical chemistry
A high-purity tin composition that can maintain high purity for a long time, in which decomposition of a triaminotin compound is suppressed and high purity of the triaminotin compound is maintained, is provided. The tin composition contains 95 mol % or more of a triaminotin compound having formula (1) in terms of tin atoms, and 0.001 to 0.5 mol % of a tetraaminotin compound having formula (2) in terms of tin atoms:R is a hydrocarbon group having 1 to 30 carbon atoms which is optionally substituted with a halogen, an oxygen atom, or a nitrogen atom, and R's are each a hydrocarbon group having 1 to 10 carbon atoms and may be identical or different from each other; two R's on the same nitrogen atom may be bonded to each other to form a 3- to 7-membered ring containing nitrogen.
Owner:MITSUBISHI CHEM CORP +1
Steel sheet and high-strength press-hardened steel component having excellent bending anisotropy, and method for manufacturing same
PendingCN121496286AFurnace typesMetallic material coating processesChemical compositionHardened steel
A steel sheet having a chemical composition comprising, in% by weight, C: 0.2% to 0.4%, Mn: 0.8% to 2.0%, Si: 0.1% to 0.5%, Al: 0.01% to 0.1%, Ti: 0.01% to 0.1%, B: 0.0005% to 0.005%, P < = 0.040%, Ca < = 0.01%, S < = 0.006%, N < = 0.01%, the steel sheet comprising, from the body to the surface of the coated steel sheet, a body comprising a population of inclusions, where MnS and TiN / Ti (C, Si) (C, Mn), S < = 0.006%, N < = 0.01%, and a skin layer occupying the outermost 10% thickness on both sides of the body. N) the sum of clustering indexes of inclusions is less than or equal to 300 [mu] m / mm < 2 >. This allows the manufacture of a hot-pressed part having a tensile strength equal to or greater than 1300 MPa and a bending anisotropy equal to or less than 7 DEG.
Owner:VALIN ARCELORMITTAL AUTOMOTIVE STEEL CO LTD +1
Steel sheet and high-strength press-hardened steel component having excellent bending anisotropy, and method for manufacturing same
PendingCN121065590AFurnace typesMetallic material coating processesChemical compositionHardened steel
A steel sheet having a chemical composition comprising, in% by weight, C: 0.2% to 0.4%, Mn: 0.8% to 2.0%, Si: 0.1% to 0.5%, Al: 0.01% to 0.1%, Ti: 0.01% to 0.1%, B: 0.0005% to 0.005%, P < = 0.040%, Ca < = 0.01%, S < = 0.006%, N < = 0.01%, the steel sheet comprising, from the body to the surface of the coated steel sheet, a body comprising a population of inclusions, where MnS and TiN / Ti (C, Si) (C, Mn), S < = 0.006%, N < = 0.01%, and a skin layer occupying the outermost 10% thickness on both sides of the body. N) the sum of clustering indexes of inclusions is less than or equal to 300 [mu] m / mm < 2 >. This allows the manufacture of a hot-pressed part having a tensile strength equal to or greater than 1300 MPa and a bending anisotropy equal to or less than 7 DEG.
Owner:VALIN ARCELORMITTAL AUTOMOTIVE STEEL CO LTD +1
Iron-tin co-doped amorphous gallium oxide-based ferromagnetic ceramic film
The invention provides an iron-tin co-doped amorphous gallium oxide-based ferromagnetic ceramic film, and belongs to the technical field of magnetic semiconductor ceramic materials. The preparation method comprises the following steps: sufficiently mixing Ga, Fe and Sn organic precursor solutions according to a certain proportion to form a GaFeSn organic precursor solution; the cleaned single crystal aluminum oxide substrate is coated with the GaFeSn organic precursor solution in a spinning mode; then putting the obtained GaFeSn organic precursor film into a tube furnace with a single temperature zone; under the air atmosphere, the temperature of the tubular furnace is slowly increased to 550 DEG C at the speed of 5 DEG C / min, heat preservation is carried out for 1 h at the temperature of 550 DEG C, annealing treatment is carried out, and the amorphous GaFeSnO magnetic ceramic film which is uniform in thickness and has the amorphous phase and strong ferromagnetism is prepared. Strong ferromagnetism of the thin film is excited with low iron element doping concentration (10%), and the problem of low conductivity caused by transition metal doping in the magnetic ceramic thin film is solved. The amorphous GaFeSnO magnetic ceramic film prepared by the method has strong ferromagnetism of 170 emu / cm < 3 > under 2K and 90 emu / cm < 3 > under 300K, and the Curie temperature of 335K.
Owner:SICHUAN UNIV
Flash and top blowing coupled molten pool tin smelting device
The utility model discloses a flash and top-blowing coupled molten pool tin smelting device, which belongs to the technical field of pyrogenic smelting of crude tin and comprises a top-blowing molten pool and a top-blowing spray gun. Wherein the lower half part of the top-blowing spray gun extends into the top-blowing molten pool, and tin concentrate, tin middling subjected to fuming enrichment and powdery tin smoke dust are subjected to ore blending with a flux and then are smelted; adding a carbonaceous reducing agent into the molten pool, and reducing to form a CO reducing atmosphere layer at the upper part of the slag layer; and blowing fluidized bed furnace roasting dry powder to the upper part of the CO reducing atmosphere layer, carrying out flash reduction smelting on the fluidized bed furnace roasting dry powder, enabling the fluidized bed furnace roasting dry powder which is not subjected to flash reduction smelting to enter a molten pool, and continuing to carry out a reduction stage in top-blowing molten pool smelting, so that flash and top-blowing coupling is realized, and crude tin is prepared. According to the utility model, flash and top-blowing molten pool smelting are effectively coupled together, fuel consumption can be reduced by about 20%, and the bed capacity is obviously improved.
Owner:YUNNAN TIN CO LTD TIN BRANCH +1
A method for preparing indium-based soft soldering sheet by vacuum hot pressing forming
The application discloses a method for preparing an indium-based soft soldering sheet by vacuum hot pressing, belongs to the technical field of thermal interface materials for chip packaging and IGBT power module welding material preparation, and is characterized in that pure indium powder or indium-tin mixed alloy powder is uniformly laid in a graphite mold, the graphite mold is vibrated or knocked, and the pure indium powder or indium-tin mixed alloy powder is laid flat and densely; the graphite mold is fixed in a vacuum hot pressing machine, a pressure of 10 MPa is applied to the vacuum hot pressing machine, vacuum is drawn to 1*10 ‑3 Pa, a temperature rising rate is controlled to be less than 5 DEG C / min, when the temperature rises to the melting point of indium or the melting temperature of the indium-tin mixed alloy, a pressure maintaining state is kept for 0.5-1 hours, then the mold is cooled to room temperature along with the furnace, the mold is taken out, and a pure indium soldering sheet or an indium-tin-based multi-element alloy soldering sheet is obtained. The method has simple process and low energy consumption, and the performance of the prepared soft thin soldering sheet is obviously improved.
Owner:YUNNAN TIN INDIUM LAB CO LTD +1
A copper-tin oxide composite material and a method for preparing the same
The application discloses a copper-tin oxide composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing spherical gas-atomized copper-tin alloy powder, ultrapure water and hydrogen peroxide solution, and placing the mixture in a high-temperature and high-pressure reaction kettle to perform supercritical water in-situ reaction to generate copper-tin oxide powder. After the reaction, the powder is treated by ultrasonic cleaning, water and ethanol cleaning and vacuum drying. Then, the copper oxide is reduced by using hydrogen gas in a tube furnace to obtain copper-tin oxide powder. After that, the copper powder and the copper-tin oxide powder are mixed in proportion, and stearic acid or anhydrous ethanol is added as a dispersant to perform ball milling, so as to obtain copper-tin oxide composite powder. Finally, the copper-tin oxide composite material is obtained by pressing and discharge plasma sintering technology. The copper-tin oxide composite powder is prepared by supercritical water in-situ oxidation, so that the process flow is simplified, the performance and conductivity of the composite material are improved, and the environmental protection requirement is met.
Owner:JIANGXI UNIV OF SCI & TECH
An alloy solder and a method of making the same
The application discloses alloy solder and a preparation method thereof, and relates to the technical field of welding. The alloy solder prepared by the application is a tin-based alloy solder, which comprises tin, silver, copper, nickel, cerium, nitrogen-doped cerium oxide, bismuth and erbium. The melting point of bismuth is relatively low, which can reduce the eutectic temperature of the alloy, so that the alloy solder can be used for low-temperature welding. However, the wettability of the solder is reduced. Therefore, a small amount of cerium is added at the same time when the bismuth is added. Under the synergistic effect of the cerium, the bismuth and the erbium, the wettability is improved, and the alloy solder is refined. A small amount of nitrogen-doped cerium oxide is further added, which can inhibit the growth of alloy eutectic compounds in the alloy solder in the non-homogeneous nucleation center, so that the cerium, the bismuth and the erbium in the solder can play the maximum role. In addition, the solder is rapidly cooled during the cooling and solidification of the solder, so that the size of each dendrite in the alloy is reduced. When the high-melting-point nitrogen-doped cerium oxide is uniformly dispersed in the solder, the crystal phase structure of the multi-component alloy solder is uniform, and the crystal grains are more refined.
Owner:JIANGSU CHANGLING PRECIOUS METAL CO LTD
A high conductivity preformed solder sheet and its preparation method
This invention provides a highly conductive preformed solder sheet, comprising a core layer and a shell layer disposed around the core layer. By embedding the solid flux core layer within the solder alloy layer to form a sandwich-like shape, the flux can be effectively protected from oxidation. There is no need to apply flux before brazing or remove it after brazing, reducing manufacturing costs and the void rate on the welded surface, thus improving the reliability of the solder sheet. The solder alloy shell is composed of tin, silver, copper, indium, cerium, vanadium, lutetium, yttrium, and zinc. The addition of small amounts of rare earth elements lutetium, yttrium, and cerium improves the conductivity and heat transfer of the solder sheet. The addition of indium, vanadium, and zinc increases the melting point of the solder sheet and improves its solidification state. Since no magnetic materials such as lead, iron, cobalt, nickel, or niobium are added, signal interference caused by metals is avoided.
Owner:ZHONGSHAN HANHUA TIN CO LTD
Tin deposition agent, preparation method and application
PendingCN121137574APrinted circuit detailsLiquid/solution decomposition chemical coatingSolder maskPhysical chemistry
The invention provides a tin deposition agent, a preparation method and application. The tin depositing agent comprises the following components: 12-18 g / L of tin methanesulfonate; 120 to 160 g / L of methanesulfonic acid; 30-60 g / L of a complexing agent; the compound stabilizer is prepared from 1 g / L to 5 g / L of trimethylglycine, 0.05 g / L to 1 g / L of phosphonate and 0.5 g / L to 3 g / L of sodium hydrogen sulfite; 50 to 150 mg / L of a wetting agent; and 50 to 150 mg / L of an emulsifier. The tin immersion agent is high in tin immersion rate, has excellent deoiling resistance, can effectively avoid the problems of solder mask falling, local welding refusal or bare copper exposure and the like in the tin immersion process, and can meet the requirements of industrial large-scale production.
Owner:SHENZHEN JUNZE ENVIRONMENTAL PROTECTION CO LTD
A method and system for rapidly predicting a creep stress exponent of a tin-based solder alloy using an integrated model
ActiveCN115132293BCreep stress exponent is simpleCreep Stress Index QuickChemical property predictionEnsemble learningData setCreep stress
The application discloses a method and system for rapidly predicting a creep stress index of a tin-based solder alloy by integrating a model, collects element compositions, test temperatures and creep stress index values of the tin-based solder alloy from literature, and adds experimental data as dataset samples; the element compositions and test temperatures of the tin-based solder alloy are sorted out and used as features for modeling; the dataset is randomly divided into a training set and a test set in a 4:1 ratio; the collected creep stress index values of the tin-based solder alloy are used as target variables, and the features are used as independent variables; based on the divided training set, the independent variables are scaled by using RobustScaler, three learners are trained and integrated to obtain an R-X-L integrated model; and the R-X-L integrated model is used to rapidly predict the creep stress index of the test set samples and four independent experimental samples. The prediction model for the creep stress index of the tin-based solder alloy is simple, fast, low-cost, pollution-free and the like based on reliable literature data and a modeling method.
Owner:SHANGHAI UNIV +1
Nitrogenating of Topological Semi-Metal Films to Increase Resistivity
PendingUS20260066168A1Manufacture of flux-sensitive headsRecord information storageInter layerThin membrane
The present disclosure generally relates to spintronic material stacks and devices. A spintronic stack comprises an amorphous layer, a texturing layer comprising one or more materials selected from the group consisting of: TaxW1-x, where x is from zero to 1, MgO, Ru, Ti, TiN, YPt, B2 alloys X—Al, where X is one of Co, Ni, Ru, Rh, or Ir, CrMo, TaxW1-x N, HfN, and TaxHf1-xN, a barrier layer comprising one or more materials selected from the group consisting of: X—AlGe, X—AlGeN, where X is one of Co, Ni, Ru, or Ir, TaxW1-xN, HfN, and TaxHf1-xN, and TiN, a YPtBi layer having a (110), (111), or (100) orientation, an interlayer, and a ferromagnetic layer. The texturing barrier layers each individually comprises a material having a high resistivity to minimize shunting, and function as a crystal symmetry transfer layer to provide the a (110), (111), or (100) orientation to the YPtBi layer.
Owner:WESTERN DIGITAL TECHNOLOGIES INC
Method for inhibiting generation of TiN inclusions in tundish and high-nitrogen-capacity tundish covering agent
The invention discloses a method for inhibiting the generation of TiN inclusions in a tundish and a high-nitrogen-capacity tundish covering agent.The method comprises the steps that before the tundish is cast, the high-nitrogen-capacity tundish covering agent is evenly added into the tundish, and a water gap outlet is completely covered with the high-nitrogen-capacity tundish covering agent. The adopted covering agent has high nitrogen capacity, nitrogen in air can be effectively prevented from spreading into molten steel, nitrogen increase of the molten steel in the pouring process is prevented, and therefore the generation probability of TiN inclusions is reduced, good economic benefits are achieved, and good market application and popularization prospects are achieved.
Owner:PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
Method for comprehensive recovery of lead-tin white soot containing arsenic and zinc and harmless vitrification of arsenic
The invention discloses a method for comprehensive recovery of lead-tin white soot containing arsenic and zinc and harmless vitrification of arsenic and a method for preparing an arsenic glass clarifying agent. The method comprises the steps of first-stage acid leaching, second-stage acid leaching, copper sulfide precipitation, zinc arsenate precipitation, alkaline leaching, calcium arsenate precipitation, calcium arsenate drying and harmless vitrification of arsenic. According to the method, the zinc raffinate acid liquor for zinc extraction is adopted for acid leaching, zinc in the zinc raffinate acid liquor can be recycled, sulfuric acid in the zinc raffinate acid liquor can be utilized, and two-stage acid leaching is conducted in sequence, so that the leaching rate of arsenic, zinc and copper is increased, the separation effect of valuable metal such as arsenic, zinc and copper from lead and tin is improved, and the recycling grade of lead and tin in the soot is improved; the processes of copper sulfide precipitation, zinc arsenate precipitation, alkaline leaching and calcium arsenate precipitation are adopted in sequence, and copper, zinc and arsenic in the leachate are extracted respectively; the arsenic-containing glass clarifying agent which is economic and environment-friendly is prepared from calcium arsenate extracted from the ash, and harmless resourceful treatment of arsenic in the white ash is realized.
Owner:RUIFENG ENVIRONMENTAL PROTECTION CO LTD +1