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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.
Corrosion-resistant nickel-based alloy welding wire and production process thereof
The invention belongs to the technical field of nickel-based alloy welding wires, and discloses a corrosion-resistant nickel-based alloy welding wire and a production process thereof, and the corrosion-resistant nickel-based alloy welding wire comprises the following components in percentage by mass: 50-65% of nickel, 16-24% of chromium, 8-10% of molybdenum, 3.5-5.5% of niobium and tantalum, 3-4.5% of copper, 3-4% of tungsten, 0.5-1.0% of tin, 0.1-0.3% of rare earth element, 0.1-0.5% of grain boundary optimizer, 2-5% of nano reinforced phase and the balance of Fe and other inevitable impurities. Through multi-element alloying design, nano reinforced phase compounding and gradient coating synergistic effect, comprehensive improvement of corrosion resistance, high-temperature mechanical property and welding manufacturability is achieved; a welding wire base body is based on nickel, a compact and self-repairing gradient oxidation film is formed by accurately regulating and controlling the atomic proportion of chromium, molybdenum and tungsten, and the chloride ion permeation resistance and the high-temperature oxidation resistance are remarkably improved; therefore, the welding wire has excellent corrosion resistance, high-temperature strength and welding adaptability.
Owner:SHANDONG TENGDA SPECIAL STEEL WIRE TECH CO LTD
Tin precursors for deposition of EUV dry resist
PendingUS20250346767A1Group 4/14 element organic compoundsPhotosensitive material processingExtreme ultravioletPolymer chemistry
The present disclosure relates to precursor compositions for forming irradiation sensitive films. In particular, the disclosure is directed to use of metal-containing precursors having haloaliphatic or unsaturated substituents, or other reactive moieties which advantageously react in the presence of extreme ultraviolet exposure to form resist films having increased etch resistance and / or reduced shrinkage upon processing. Alternatively, the use of metal-containing precursors having haloaliphatic or unsaturated substituents, or other reactive moieties for patterning structures having carbon-containing underlayers may advantageously react with the underlayer to increase adhesion of the resist film to the underlayer.
Owner:LAM RES CORP
Manufacturing method of 925 silver jewelry
The invention discloses a manufacturing method of 925 silver jewelry, which comprises the following steps: S1, preparing alloy components, S2, designing a cast tree structure, S3, casting, and S4, densifying a casting, the alloy components comprise 92.5-93.0% of silver, 1.0-3.0% of platinum, 0.05-0.5% of copper, 1.5-3.5% of zinc, 1.5-3.5% of indium, 0.03-0.3% of tin, 0.05-0.5% of germanium, 0.03-0.3% of rare earth, and 0.003-0.02% of boron. According to the manufacturing method, alloy components are optimized, the casting performance of the alloy components is improved, the casting process is optimized, the feeding capacity of molten metal is improved, shrinkage porosity and air holes are reduced, the initial density of the casting is improved, and subsequent composite treatment is carried out, so that the density from the surface to the shallow surface of the casting is further improved, grains are refined, and the surface roughness is further reduced; and the requirement of high brightness of the jewelry surface is met.
Owner:GUANGZHOU PANYU POLYTECHNIC
Preparation method of tin or tin alloy coated copper powder and low-temperature conductive paste
The present invention provides a method for preparing tin or tin alloy-coated copper powder and a low-temperature conductive paste, wherein the method comprises the following steps: S10, pretreating the surface of the copper powder to remove oxides and impurities on the copper powder surface; S20, placing the pretreated copper powder in an electroplating solution containing an organic phosphine compound additive; electroplating the copper powder using tin metal or tin alloy as an anode and copper powder as a cathode, wherein the copper powder is dispersed during the electroplating process; S30, after the electroplating is completed, filtering, washing, and drying to obtain the tin or tin alloy-coated copper powder. The addition of the organic phosphine compound in the present invention greatly improves the compactness of the tin or tin alloy coating formed on the surface of the copper powder, thereby making the prepared tin-coated copper powder or tin alloy-coated copper powder have the advantage of better oxidation resistance.
Owner:JINGLAN ADVANCED MATERIAL CO LTD
Ruthenium and samarium double monatomic doped three-dimensional titanium-based tin antimony nickel electrode and preparation method and application thereof
The invention discloses a ruthenium and samarium double monatomic doped three-dimensional titanium-based tin antimony nickel electrode and a preparation method and application thereof. The preparation method of the electrode comprises the following steps: (1) pretreating the titanium felt; (2) preparing a sol impregnation liquid; (3) sol coating and drying: dipping the pretreated titanium felt in the prepared sol dipping liquid, fully adsorbing and then drying to form a uniform precursor layer; and (4) roasting treatment is conducted, specifically, the dried titanium felt is placed in a muffle furnace to be roasted, and then the steps of dipping, drying and roasting are repeated till the final ruthenium and samarium double monatomic doped three-dimensional titanium-based tin-antimony-nickel electrode is obtained. In the prepared electrocatalyst, ruthenium and samarium are doped into a tin-antimony-nickel electrode in a monatomic form, the utilization efficiency of ruthenium and samarium atoms is improved, and the electrode is endowed with excellent electrocatalytic activity. The unique three-dimensional structure and double-monatomic doping significantly enhance the electron transfer rate and the reaction kinetic characteristics, so that the electrode shows excellent stability and efficient hypochlorous acid generation ability.
Owner:ZHEJIANG UNIV OF TECH
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
Hot-dip galvanized low-alloy high-strength steel plate and production method thereof
InactiveCN120591661AHot-dipping/immersion processesManufacturing convertersAustenite grainChemical composition
The invention relates to the technical field of metallurgy, in particular to a hot galvanizing low-alloy high-strength steel plate which comprises the following chemical components in percentage by mass: 0.06%-0.08% of C, 0.20%-0.25% of Si, 1.20%-1.35% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020%-0.060% of Alt, 0.035%-0.050% of Nb, 0.010%-0.020% of Ti, less than or equal to 0.0050% of O, less than or equal to 0.0060% of N and the balance of Fe and inevitable impurities. The contents of C, Si and Mn in the chemical components are controlled, the welding performance of the hot-dip galvanizing low-alloy high-strength steel and the surface quality of a finished product are considered, Nb microalloying is mainly adopted, a proper amount of microalloy element Ti is added to form TiN, austenite grain coarsening is limited in the slab heating and heat preservation process, and fine and dispersed precipitated phases are finally obtained in combination with process control; the hot-dip galvanized low-alloy high-strength steel finished product is good in structure form and excellent in comprehensive performance.
Owner:BENGANG STEEL PLATES CO LTD
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
Non-ferrous metal solder for low-temperature brazing and application
The invention relates to the field of solder materials, and provides a non-ferrous metal solder for low-temperature brazing and application, the solder is composed of carbon-coated copper nanorods, tin-bismuth alloy-coated silver nanoparticles, 2-mercaptobenzimidazole, rosin resin, an organic active agent, a dispersing agent, ionic liquid, hydroxyethyl cellulose, indium nitrate and citric acid. The silver particles are of a core-shell structure and are coated with tin-bismuth alloy layers, and continuous carbon layers are formed on the surfaces of the copper nanorods, so that the conductivity and the interface stability of the solder are effectively improved. The non-ferrous metal solder with excellent conductivity, low melting point and good wettability is prepared through step-by-step mixing, hot press molding and low-temperature heat treatment processes, and is suitable for electronic device packaging, power device connection and flexible circuit interconnection, and the defects of existing solder in the aspects of low-temperature welding and high conductivity are overcome.
Owner:HUNAN YISIDI TECH CO LTD
Low-strength high-formability austenitic stainless steel and manufacturing method thereof
According to the low-strength high-formability austenitic stainless steel and the manufacturing method thereof, C + N is controlled to be smaller than or equal to 0.035%, the manganese content is controlled to be within 1.5%, the tin content is limited to be 0.01%-0.30%, the copper content is limited to be 2.4%-4.5%, and the tin-copper ratio is that (Sn / Cu) * 1000 is larger than or equal to 5 and smaller than or equal to 50, so that it is guaranteed that tin exerts the beneficial effects such as the corrosion resistance is improved, and the harm of tin segregation can be controlled to be at the low level; according to the finally obtained austenitic stainless steel, the yield strength is smaller than or equal to 160 Mpa, the tensile strength is smaller than or equal to 500 Mpa, the ductility is larger than or equal to 55%, the grain size grade is 6-8, edge cracks cannot occur during hot rolling, the martensite content of a cup drawing deformation part is 0.05% or below during large deformation machining, in other words, the austenite phase is still stable under the complex deformation condition, deformation cracks are avoided, and the service life of the austenitic stainless steel is prolonged. The comprehensive effects of high corrosion resistance, low strength and high forming machinability of the material are achieved.
Owner:BAOSTEEL DESHENG STAINLESS STEEL
Magnetic code disc film material and preparation method and application thereof
The invention provides a magnetic code disc film material and a preparation method and application thereof. By introducing the TiN layer, a proper amount of nitrogen atoms can enter lattice gaps of iron, electron cloud distribution of iron atoms is changed, and the magnetic moment of the iron atoms is changed; the magnetic moment of Fe atoms can be influenced by N atoms and crystal structures, an alpha-Fe8N phase is formed in FeCoCr through introduction of N ions, the average magnetic moment of each Fe atom in the alpha-Fe8N phase is 2.4 mu B, alpha-Fe8N is a metastable phase, a sample can finally form stable gamma '-Fe4N through annealing, and the magnetic moment of the stable gamma'-Fe4N is generally about 2.5 mu B-2. 7 mu B and is higher than the magnetic moment 2.2 mu B of the Fe atoms in metal Fe; besides, Ti forms a Ti-Fe weak magnetic phase pinning magnetic domain wall in the FeCoCr thin film, and the coercive force and residual magnetism of the FeCoCr layer can be effectively improved at the same time through the method.
Owner:JIHUA LAB
Mining area tailing classified filling system and filling method
The mining area tailing grading filling system is composed of a tailing collecting device, a grading module, a filling slurry preparing module, a conveying module and a filling module and is designed according to the characteristics that tailings of lead-zinc-silver ore and copper-tin-silver-zinc ore contain heavy metal and are complex in particle size. A heavy metal adsorption layer is arranged at the bottom of a collection pool of the tailings collection device, and a sulfide adsorbent is adopted, so that heavy metal ions such as lead, zinc and copper in the tailings can be effectively adsorbed; a cyclone of the grading module is made of a corrosion-resistant material, erosion of chemical substances in the tailings is prevented, the tailings are accurately graded, and grading of filling materials is optimized; the tailings with different particle sizes are accurately separated according to the characteristics of the tailings of the lead-zinc-silver ore and the copper-tin-silver-zinc ore by using the cyclone and multi-layer vibrating screen combined grading equipment; equipment parameters are adjusted to accurately control the granularity of the tailings, so that reasonable grading raw materials are provided for preparation of filling slurry, and the compactness and the stability of a filling body are improved.
Owner:XIWUZHUMUQIN YINMAN MINING CO LTD
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
Copper-based friction plate of wind power high-speed shaft brake and manufacturing method
The invention discloses a copper-based friction plate of a wind power high-speed shaft brake and a manufacturing method, the friction plate comprises a friction material, the friction material comprises a friction layer and a friction layer, the friction layer comprises the following raw materials in percentage by weight: 65-72% of copper powder, 1-6% of iron powder, 3-10% of high-carbon ferrochrome powder, 8-15% of copper-tin-titanium powder and 15-20% of graphite powder; 1 to 5% of TiB2; and the transition layer comprises the following raw materials in percentage by weight: 70-75.4% of iron powder, 23-28% of copper powder, 1-3% of graphite powder and 0.6-1.2% of copper welding powder. The friction plate in the technical scheme is low in cost, does not contain harmful elements such as lead, meets the environmental protection requirement, integrates the advantages of a copper-based friction plate and an iron-based friction plate, has a stable friction factor and good wear resistance, and has the friction performance superior to that of an imported friction plate.
Owner:HANGZHOU ADVANCE GEARBOX GRP
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
Preparation method of core-shell nanofiber gas-sensitive material based on platinum-doped cobalt oxide and tin oxide heterostructure
ActiveCN119265749BFilament/thread formingConjugated artificial filamentsHeterojunctionMaterials science
The present invention discloses a novel gas-sensitive material, specifically a method for preparing a core-shell nanofiber gas-sensitive material based on a platinum-doped cobalt oxide / tin oxide heterostructure. The present invention utilizes a cobalt source, a tin source, a platinum source, and a polymer as raw materials, and produces a nanoscale platinum-doped cobalt oxide / tin oxide gas-sensitive material with high sensitivity and rapid response to hydrogen sulfide gas via coaxial electrospinning. This gas-sensitive material exhibits excellent gas-sensing properties for H2S gas at room temperature, with a short response time, enabling rapid detection of low-concentration H2S gas, a short recovery time, and excellent cyclic stability. Therefore, the gas-sensitive material of the present invention possesses excellent sensitivity and stability, and has broad application prospects, including applications in environmental monitoring, industrial safety, and gas sensors.
Owner:TIANJIN POLYTECHNIC UNIV
NiCu-based alloy catalyst for preparing high-value product from natural gas through decarbonization and application of NiCu-based alloy catalyst
The invention discloses a NiCu-based alloy catalyst for preparing high-value products through natural gas decarbonization and application of the NiCu-based alloy catalyst, and belongs to the technical field of natural gas high-value catalytic conversion. The preparation method of the NiCu-based alloy catalyst comprises the following steps: (1) adding nickel nitrate hexahydrate and urea into hot water, adding ethylene glycol, carrying out a stirring reaction at 120-150 DEG C, and calcining the obtained intermediate to obtain a nickel oxide precursor; (2) adding a copper nitrate aqueous solution and ammonia water into the nickel oxide precursor, so that copper ions are anchored on the surface of nickel oxide, drying and calcining to obtain a Ni-Cu alloy oxide precursor; and (3) adding the Ni-Cu alloy oxide precursor, bismuth trioxide and metallic tin into deionized water, adding a complexing agent, carrying out ultrasonic treatment, and carrying out H2 reduction calcination on the obtained precipitate to obtain the Ni < x > Cu < y > Bi < z > Snm alloy. The NiCu-based alloy catalyst is used in a natural gas decarburization high-value product preparation reaction, and the natural gas decarburization reaction is sufficient, and long-term efficient conversion and stable operation are achieved by combining the synergistic effect of ultrasonic waves and an alternating magnetic field.
Owner:SOUTHWEST PETROLEUM UNIV
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
Device for removing oxide layer on surface of tin-phosphor bronze before hot rolling treatment
The invention relates to a device for removing an oxide layer on the surface of tin-phosphor bronze before hot rolling treatment, and belongs to the technical field of tin-phosphor bronze surface treatment.The device comprises a supporting structure used for supporting a grinding mechanism, and the supporting structure is provided with a chuck and a driving mechanism which are used in cooperation with the grinding mechanism; a knocking mechanism and a limiting plate which are used for treating tin-phosphor bronze are arranged on one side of the grinding mechanism, and a liquid conveying mechanism used in cooperation with the grinding mechanism is further arranged on the supporting structure. The knocking mechanism comprises a knocking block and a connecting frame arranged above the knocking block, and a mounting shaft for mounting the knocking block is fixed to the bottom side of the connecting frame. After the device for removing the surface oxide layer of the tin-phosphor bronze before hot rolling treatment is used in cooperation with a knocking function, the device for removing the surface oxide layer of the tin-phosphor bronze has remarkable advantages in the aspects of removal efficiency, surface quality, treatment stability, equipment service life, production efficiency and flexibility, environmental protection, energy conservation and the like.
Owner:ANHUI CHUJIANG HIGH PRECISION COPPER STRIP CO LTD
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
Platinum-based high-entropy intermetallic compound electrocatalyst and preparation method thereof
The invention discloses a platinum-based high-entropy intermetallic compound electrocatalyst and a preparation method thereof, the electrocatalyst is carbon material loaded platinum-based high-entropy intermetallic compound nanoparticles, and comprises 1-6 of six metal elements of platinum, manganese, iron, cobalt, nickel, zinc and copper, and 1-3 of three metal elements of gallium, indium and tin; in the nano-particles, platinum atoms account for 40%-60% of atoms, the platinum atoms and other metal atoms are orderly and regularly arranged, and the phase structure is an L10 phase. The preparation method of the platinum-based high-entropy intermetallic compound electrocatalyst is simple in process, and the metal loading capacity can be effectively controlled. Due to the introduction of the low-melting-point gallium / indium / tin metal, the high-entropy intermetallic compound can be prepared at a relatively low temperature, the agglomeration / sintering phenomenon is effectively avoided, and the platinum-based high-entropy intermetallic compound electrocatalyst with uniform size and adjustable components can be obtained. The electrocatalyst can be used for a fuel cell cathode material, and has important significance for improving the performance of a fuel cell.
Owner:PEKING 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
Die casting process for copper retainer
The invention relates to the technical field of bearing manufacturing, in particular to a copper retainer die-casting process which comprises the following steps: firstly, mixing electrolytic copper, tin and zinc with rare earth yttrium, nano silicon carbide and graphene nanosheets, and performing vacuum melting and degassing to prepare a composite alloy; the mold is subjected to laser cladding and supersonic spraying to form a gradient coating; the alloy melt is subjected to high-speed mold filling under ultrasonic vibration, and pulse pressure is applied for pressure maintaining; gradient cooling is conducted after forming, and then two-step aging and pressure stress treatment are conducted; and finally, surface nanocrystallization treatment is carried out through ion implantation and ultrasonic shot blasting, and the performance is improved. The material utilization rate is increased to be larger than or equal to 92%, energy consumption is reduced, the tensile strength of the product is larger than or equal to 400 MPa, abrasion resistance is improved, the size precision is high, and the method is environmentally friendly and suitable for high-end bearing manufacturing.
Owner:LINQING KUAIYUE PRECISION BEARING MANUFACTURING CO LTD
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
High-wear-resistance hard alloy CVD (Chemical Vapor Deposition) coated cutting tool and preparation method thereof
The invention discloses a high-wear-resistance hard alloy CVD (Chemical Vapor Deposition) coated cutting tool and a preparation method thereof, WC-Co (4-8) Ti (1-5) Ta (1-5) Nb (0.2-2) Cr (0.2-2) Fe (0.2-2) Al (0.2-2) is used as a blade substrate, TiN, TiCN, Al2O3 and a surface TiN coating are deposited firstly, and then the coated blade is subjected to subzero treatment and tempering treatment. According to the method, through subzero treatment between the base body and the coating, the compressive stress is introduced into the coating or an interface by utilizing the difference of the extremely low temperature shrinkage rates of the coating and the base body, the tensile stress caused by the compressive stress neutralization deposition is utilized, and the uniform distribution of nanoscale carbide precipitates is promoted by utilizing a proper tempering process; and the cold brittleness phenomenon caused by subzero treatment and the generated high residual compressive stress are avoided, and the abrasion resistance and the anti-stripping capacity of the base body are further improved. According to the method, the driving effect of residual tensile stress in the CVD coating on crack initiation is reduced, the crack density is greatly reduced, the mechanical property of a hard alloy matrix and the stress state of the coating are synergistically improved, and the mechanical property of the cutter is enhanced.
Owner:OKE PRECISION CUTTING TOOLS CO LTD
Vacuum directional solidification furnace
The invention discloses a vacuum directional solidification furnace and relates to the field of alloy manufacturing, the vacuum directional solidification furnace comprises a smelting chamber, a casting cavity is formed in the inner side of the smelting chamber, a smelting crucible is rotatably mounted on the side end face of the casting cavity, and a lifting guide rail is welded to the end face of the side, adjacent to the smelting crucible, of the inner side of the smelting chamber; the lifting mechanism is installed on the inner side of the smelting chamber, the lifting mechanism can be prevented from influencing opening and closing of the flap valve by moving from top to bottom, the flap valve can be closed when the smelting crucible smelts metal materials, high-temperature tin steam in the cooling tin pot at the bottom cannot float into the smelting crucible, and the smelting efficiency is improved. And in addition, the internal vacuum state during smelting is beneficial to crystal formation, it is guaranteed that the formed high-strength alloy material cannot cause alloy cracks due to tin fusion, it is guaranteed that the alloy performance cannot be affected by tin while the alloy integrity is guaranteed, the alloy quality is improved, the yield is increased, and the influence of tin steam on top alloy melt is further reduced.
Owner:JIANGSU YUANSHI AVIATION TECHNOLOGY CO LTD
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