60 results about "Tin Element" patented technology

The invention discloses a combined determination method for the tin content of iron ore, which is characterized by comprising the following steps: drawing a calibration curve; selecting measurement parameters of an instrument; weighing a sample; sample melting: uniformly mixing the weighed sample with a mixed flux in a certain proportion, and melting in a muffle furnace; extracting a sample: extracting the fused sample by using hydrochloric acid, and fixing the volume for detection; and sample determination: determining by using an inductively coupled plasma emission spectrometer, determining the intensity value of each element by drawing a standard curve method, and calculating the final content of the element according to a calibration curve made by a standard solution. The invention aims to provide the combined determination method for the tin content of the iron ore, through experiments, the accuracy of determining the standard substance and the tin element of the tin-containing iron ore can be guaranteed, and through standard recovery experiments, the recovery rate is 95% or above. The method is used for production practice, and is an effective and practical method.

This invention provides a method for preparing a titanium-tin master alloy with tin segregation suppression and a cooling device. The preparation method includes: (1) pressing a molten blank; (2) smelting and refining to obtain an alloy melt; (3) casting and cooling: after turning on the cooling device, the alloy melt is poured into the cooling device, cooled, and then demolded to obtain a titanium-tin master alloy; the outer surface and the interior of the cooling device are equipped with water-cooling units. This invention utilizes the raw material structure of "titanium-tin core" to effectively reduce the occurrence of tin seepage in the crucible, reduce tin raw material loss, and improve the accuracy of alloy composition; combined with the cooling device to achieve internal and external synergistic cooling, it can effectively suppress tin atom diffusion, prevent the occurrence of tin element anti-segregation in the traditional smelting process, enhance the uniform distribution of tin element in the titanium-tin alloy ingot, and control the tin element content deviation in the titanium-tin alloy ingot within 2wt%.

The invention provides a composite refining agent for impurity removal of scrap brass and application of the composite refining agent, and the composite refining agent comprises a Cu-Y intermediate alloy, a Cu-Ti intermediate alloy, a Cu-B intermediate alloy, an Mg-Ca intermediate alloy, lime, sodium carbonate, pyroborax, fluorite, sodium fluoride and cryolite. Aiming at the impurities of iron, lead, bismuth and tin in the yellow scrap copper raw material, the composite refining agent can effectively remove the impurities of iron, lead, bismuth and tin, the deoxidation capacity is high, slag is easy to clean, meanwhile, Y, Ti, B, Ca and the like serve as beneficial elements of an alterant, ingot casting grains can be effectively refined, the metallurgical quality of brass alloy is improved, and the service life of the alloy is prolonged. And the hot and cold processing properties and mechanical properties of the brass alloy are improved, so that the regeneration and cyclic utilization of the scrap brass are realized.

The invention relates to the technical field of aluminum alloy materials, in particular to a high-strength corrosion-resistant photovoltaic aluminum alloy frame profile and a preparation method thereof. The aluminum alloy comprises the following components in percentage by mass: 0.65 to 0.75 percent of Si, 0.60 to 0.68 percent of Mg, 0.01 to 0.05 percent of Mn, 0.01 to 0.05 percent of Cr, less than 0.15 percent of Fe, 0.02 to 0.045 percent of Ti, 0.06 to 0.08 percent of Cu, 0.18 to 0.22 percent of Sn and the balance of Al. Due to the addition of the tin element and the precise control of the contents of main alloy elements such as magnesium and silicon, the alloy disclosed by the invention shows higher strength, toughness and fatigue resistance, so that the alloy can keep higher structural stability and durability when bearing a complex stress environment, for example, a photovoltaic frame is used for a long time in an outdoor environment. And meanwhile, the aging time required for achieving the optimal mechanical property is remarkably shortened, and the method has important significance in the aspects of improving the production efficiency, reducing the production cost, reducing the energy consumption, achieving green production and the like.

The invention belongs to the technical field of hydrogen energy and fuel cell catalyst preparation, and particularly relates to a carbon-loaded palladium-tin intermetallic compound and a preparation method and application thereof. The preparation method comprises the following steps: dispersing palladium salt, tin salt and a carbon carrier in a solvent, ultrasonically mixing, heating until the solvent is evaporated, drying an obtained solid product, and grinding to obtain precursor solid powder; and heating and reducing the precursor solid powder in a reducing atmosphere to obtain the carbon-loaded palladium-tin intermetallic compound. By introducing low-melting-point and relatively-cheap metallic tin, not only can the formation temperature of intermetallic compounds be reduced and the energy consumption be reduced, but also more OH and CO adsorption and desorption sites can be provided by doping the tin element, the electro-catalytic activity and the CO poisoning resistance can be improved, and the preparation method is simple and easy to implement. The problems that hydrogen energy and fuel cell catalysts are poor in activity, the preparation method is tedious, and the CO poisoning resistance is poor are effectively solved.

The invention belongs to the technical field of soil and sediment detection, and particularly relates to a method for measuring the content of a tin element in soil and sediment, which comprises the following steps: S1, sample treatment; the method comprises the following steps: weighing a soil or sediment sample, adding an acid solution and ultrapure water, carrying out gradient heating digestion, and fixing the volume with acid after digestion to obtain a test solution; the method is different from a conventional four-acid digestion method, and digesting is carried out by using a diacid digestion method of nitric acid and hydrofluoric acid and a full-automatic graphite digestion method; s2, tin content determination: taking the test sample solution, injecting the test sample solution into an inductively coupled plasma mass spectrometer to obtain test data, and calculating the content of the tin element in the test sample solution according to the test data. The tin element is measured by combining the inductively coupled plasma mass spectrometer, the detection mode is matched with an optimized gradient heating and diacid full-automatic digestion method, the accuracy and reliability of a detection result can be guaranteed, and the method is suitable for accurate analysis of the tin element in soil and sediments.

The invention belongs to the technical field of superconducting wires, and particularly relates to a CuSnTi / Nb composite material for a Ni3Sn superconducting wire and a preparation method and application of the CuSnTi / Nb composite material. The preparation method comprises the steps that molten CuSnTi alloy liquid is cast into a mold where a niobium rod is fixed for heat preservation, then directional solidification is conducted, an obtained CuSnTi / Nb composite blank is subjected to heat treatment, and the CuSnTi / Nb composite material is obtained. The directional solidification technology is adopted for preparing the CuSnTi / Nb composite blank, the temperature gradient and the cooling rate in the solidification process are accurately controlled, tin element segregation can be effectively restrained, generation of brittle phases is reduced, the structure uniformity is improved, and a directional solidification structure is obtained, so that the plasticity of the alloy in the axial direction is improved, the ductility of the CuSnTi / Nb composite material is greatly improved, and the service life of the CuSnTi / Nb composite material is prolonged. The problem that in the process of preparing the Nb3Sn superconducting wire through a bronze method, the CuSnTi alloy is quick in work hardening and insufficient in plasticity, and consequently the core of the superconducting wire is broken is solved.

The present invention discloses a conductive Al-Cu-Sn-Er rare earth aluminum alloy and a processing method thereof, wherein the content of copper element in the rare earth aluminum alloy is 0.2-1.0wt%, the content of tin element is 0.1-0.8wt%, the sum of the content of tin element and erbium element is less than or equal to 1.0wt%, and the remainder is aluminum. The processing method is as follows: pure aluminum is smelted in an atmospheric environment by a medium frequency induction smelting furnace to obtain a pure aluminum melt; aluminum-copper master alloy, aluminum-tin master alloy and aluminum-erbium master alloy are sequentially added to the pure aluminum melt to obtain a mixed melt by smelting; the mixed melt is cast by a near-liquidus casting method to obtain an alloy ingot; the alloy ingot is subjected to a solid solution treatment to obtain an alloy billet; the alloy billet is subjected to alternating treatments of three rollings and three-stage aging. The present invention can solve the problem that the electrical conductivity and mechanical strength of the existing aluminum alloy cannot be combined.

The invention discloses a soldering tin testing machine special for a motor rotor, and relates to the field of soldering tin testing, the soldering tin testing machine comprises a conveying table, a testing mechanism, an image acquisition part and a detection module, the detection module is installed on the surface of the conveying table, the testing mechanism is arranged on one side of the conveying table, the image acquisition part is arranged on one side of the testing mechanism, and the image acquisition part is arranged on the other side of the testing mechanism. Wherein the conveying table is used for bearing the conveying work of a to-be-tested motor rotor subjected to soldering tin and bearing all functional parts and functional modules; the testing mechanism is used for dual continuous treatment of smoke collection and stability testing after tin soldering when tin soldering is carried out on the tin-soldered electronic rotor; the tin soldering smoke absorption and the strength test of the tin soldering element can be conveniently combined, the dual functions of the device can be automatically switched, the pollution in the test process is reduced, the abnormal condition in the tin soldering process is effectively recorded and tracked through the abnormal analysis and traceability of the detection module, and the source of a fault is quickly positioned through traceability analysis.

The present application provides a modified electrolyte and a preparation method therefor, an electrode material, and a battery. The modified electrolyte comprises a basic electrolyte and metal particles attached to the surface of the basic electrolyte; the material of the metal particles comprises one or more of a nickel element, a copper element, a tin element, an iron element, a cobalt element and a precious metal element. According to the modified electrolyte provided by the present application, a specific solid electrolyte is used as the basic electrolyte, the surface of the basic electrolyte is modified with the metal particles, the electronic conductivity of the modified electrolyte is effectively improved by means of cooperation of the basic electrolyte and the metal particles, and the positive electrode material containing the modified electrolyte can simultaneously improve the effective transmission of ions and electrons, such that the battery having the positive electrode material has both low interface impedance and good electrochemical performance.

The invention discloses a gold purification method for gold-tin eutectic alloy waste. The method comprises the following steps: S1, dissolving; s2, first-time tin removal, wherein free tin elements are removed; s3, second-time tin removal is conducted, specifically, complex-state tin elements and impurity elements are removed; s4, tin is removed for the third time, and a trace amount of residual tin element is removed; and S5, gold reduction and purification. According to the method, tin elements in different forms (free state-complex state-trace residue) are removed in stages, copper powder replacement, hydrochloric acid boiling and washing and hydrolysis tin removal methods are combined, deep removal of tin in the gold dissolving solution is achieved, the purpose of efficiently separating and purifying high-purity gold from the gold-tin eutectic alloy waste is achieved, operation is easy, and complex equipment is not needed.

A solid electrolyte according to one aspect of the present invention contains the element lithium, the element phosphorus, an element M, the element sulfur, and an element X, wherein the element M is at least one selection from the group consisting of the element silicon, the element germanium, and the element tin, and the element X is at least one selection from the group consisting of the element bromine and the element iodine. In an X-ray diffraction diagram of the solid electrolyte obtained using CuKα radiation, a diffraction peak A is present in the range of diffraction angle 2θ = 20.1° ± 0.3°, a diffraction peak B is present in the range of diffraction angle 2θ = 29.4° ± 0.3°, and a diffraction peak C is present in the range of diffraction angle 2θ = 33.3° ± 0.3°. The ratio IC / IB in the X-ray diffraction diagram of the intensity IC of the diffraction peak C to the intensity IB of the diffraction peak B is at least 0.15. The X-ray diffraction diagram either does not have a diffraction peak in the range of diffraction angle 2θ = 24.9° ± 0.3° or has a diffraction peak D in the range of diffraction angle 2θ = 24.9° ± 0.3° with the ratio ID / IB of the intensity ID of the diffraction peak D to the intensity IB of the diffraction peak B being not more than 0.05.

The invention relates to the technical field of tin content detection, and particularly discloses a method for detecting the tin content in tin bronze electroplating liquid. The method comprises the following steps: accurately preparing a tin standard working solution with the concentration of 20-200mg / L according to gradient, detecting the tin standard working solution with each concentration through an atomic absorption spectrometer, determining the absorbance, and establishing a concentration-absorbance standard curve of the tin standard working solution; the method comprises the following steps: treating a to-be-detected tin bronze electroplating solution sample, measuring the absorbance of a to-be-detected sample solution, converting the tin element concentration in the to-be-detected sample solution on the basis of an established tin standard working solution concentration-absorbance standard curve, and further calculating the mass concentration of tin in the to-be-detected sample solution. The method has high accuracy, the adding standard recovery rate is 99.0-100.3%, the precision test RSD is far less than 5%, and the precision and accuracy of the detection result are far higher than those of the traditional detection method.

Provided are a composite electrode, and a light-emitting diode having the composite electrode and a preparation method therefor, relating to the technical field of semiconductors. The light-emitting diode comprises an epitaxial layer and the composite electrode. The composite electrode comprises an adhesion barrier layer and a solder layer sequentially stacked on the epitaxial layer; the solder layer comprises at least two solder sub-layers sequentially stacked; each solder sub-layer is a gold-tin alloy layer; in each solder sub-layer, the mass ratio of gold element to tin element increases progressively in the direction away from the adhesion barrier layer; and in two adjacent solder sub-layers, the maximum mass ratio of gold element to tin element in the solder sub-layer closer to the adhesion barrier layer is greater than the minimum mass ratio of gold element to tin element in the solder sub-layer farther from the adhesion barrier layer. The present disclosure can effectively improve the soldering and packaging reliability of the light-emitting diode.

The invention provides a composite brazing sheet, a preparation method thereof and a brazing body. The composite brazing sheet comprises a core material and a brazing filler metal layer arranged on the surface of at least one side of the core material, and a middle layer is arranged between the core material and the brazing filler metal layer. The middle layer comprises a low-melting-point phase; the melting point of the low-melting-point phase is not higher than 600 DEG C; the low-melting-point phase includes a magnesium element and at least one element selected from a bismuth element and a tin element. The composite brazing sheet provided by the invention is provided with the middle layer, and the middle layer forms a specific low-melting-point phase, so that oxide film breaking and wetting uniformity are improved, and formation of an effective welding seam is more facilitated, so that use of a brazing flux in a CAB brazing process is avoided, the problem of brazing flux residue is thoroughly avoided, and meanwhile, a good brazing effect is ensured.

The invention provides a core-shell type catalyst as well as a preparation method and application thereof. The core-shell type catalyst comprises an inner core, and an inner coating layer and an outer coating layer which are sequentially coated on the surface of the inner core, the inner core comprises a nickel-cobalt oxide, the inner coating layer comprises a tin-doped iridium ruthenium oxide, and the outer coating layer comprises a titanium-based oxide. According to the catalyst, the nickel-cobalt oxide serves as an inner core, structural support is provided, electron transfer is assisted through Ni < 2 + > / Ni < 3 + > redox pairs, and the catalytic activity is improved; due to the introduction of the tin element in the inner coating layer, the d-band center of Ir / Ru is regulated and controlled, the intrinsic activity of OER is improved, and meanwhile dissolution and loss of precious metal are inhibited; and the outer coating layer is tightly combined with the inner coating layer by forming Ti-O-Ir bonding, so that the interface stability is further enhanced, effective physical protection and chemical anchoring are provided for the noble metal, and the loss path of the noble metal is doubly blocked. The catalyst synchronously realizes the improvement of catalytic activity and the enhancement of long-term durability.

The application provides a tin mineralization identification and sampling method fusing XRF and spectral data, and relates to the technical field of geological exploration and mineral exploration. The method comprises the following steps: tin element content distribution is obtained by adopting portable XRF to perform grid rapid scanning; the characteristic peak of altered mineral is identified by using a portable spectrometer at an abnormal point; XRF data and spectral data are fused; the boundary of a tin mineralization body is rapidly circled on site; and the geological logging and sampling are guided accordingly. The application implements forced sampling on the point which is not mineralized by naked eyes but is determined as mineralized by instruments, and fundamentally solves the technical problem of "logging without seeing and supplementing sampling with ore". The application can significantly reduce the ore leakage rate, improve the accuracy and efficiency of logging and sampling, shorten the exploration period, and can be popularized to the on-site exploration of other difficult-to-identify metal minerals.

The invention discloses a BDD modified electrode, a modification method and application of the BDD modified electrode in production of persulfate through electrocatalytic oxidation of sulfate. A BDD electrode is used as a substrate, and a SnO2 / Sb2O5 / CeO2 transition metal oxide catalytic layer composed of a tin element, an antimony element and a cerium element is deposited on the surface of the BDD electrode. The catalyst layer covers the diamond peak bottom concave end on the surface of the electrode, so that the hydroxyl free radical production capacity of the electrode is improved, the catalyst layer is combined more tightly due to a certain Sn: Sb ratio, the service life of the catalyst layer is prolonged by doping trace Ce, the electron transmission capacity is improved, and the oxidation capacity of the electrode is further improved. The catalyst layer is prepared through electrochemical linear voltammetry deposition, only metal ions and an inorganic system are used as electrolyte in the method, and synthesis conditions are environmentally friendly and easy to amplify. The BDD modified electrode provided by the invention is applied to production of persulfate, the FE content exceeds 84.5% under the 1M sulfate concentration of 30mA / cm < 2 >, and the FE content can reach 93% or above in a 3M sulfate system.

The present invention discloses a perovskite thin film, a preparation method thereof and an application thereof. The preparation method comprises the following steps: (1) A tin source and a halide are placed in an organic solvent, and after stirring, a tin-containing perovskite precursor solution is obtained; (2) A metal replacement powder is added to the tin-containing perovskite precursor solution, and a galvanic replacement reaction occurs to reduce tetravalent tin in the tin-containing perovskite precursor solution to divalent tin, and a replacement solution is obtained after filtration; (3) The replacement solution is spin-coated by a one-step method to obtain a tin-based perovskite thin film. The present invention can effectively inhibit the oxidation of tin elements in the thin film, reduce the defect density and non-radiative recombination centers, improve the stability of the thin film, thereby improving the photoelectric conversion efficiency of the tin-based perovskite solar cell device and enhancing the stability of the tin-based perovskite solar cell device.

The present invention discloses a method for improving the tin recovery rate during pyrometallurgical lead smelting, relating to the field of non-ferrous metal smelting. The method involves mixing a copper-containing material with a lead concentrate in a predetermined ratio. After batching, bottom-blowing smelting, reduction smelting, and pyrometallurgical refining to remove copper and tin, a copper slag with a high tin content is produced. By introducing copper into the pyrometallurgical lead smelting process, the method achieves efficient enrichment of tin from the lead concentrate in the copper slag, thereby improving the tin recovery and enrichment rates during the pyrometallurgical lead smelting process. The copper slag with a high tin content can be used as a raw material for further tin recovery. The method is simple to operate and has good economic benefits.

The invention discloses a method for refining and detinning tin-containing crude copper, which comprises the following steps: S1, preparing tin-containing crude copper into powder, adding excessive cuprous sulfide powder, and uniformly mixing to obtain a prefabricated mixture; s2, the prefabricated mixture is put into a vacuum distillation furnace for vacuum distillation, the vacuum distillation vacuum degree is set to be 1-100 Pa, the initial temperature is 627-927 DEG C, the heat preservation time is 3-5 h during the period, the temperature is gradually increased to 1000-1083 DEG C, and heat preservation is conducted for 1-2 h; s3, after heat preservation is completed, heating is conducted till the mixture in the vacuum distillation furnace is completely melted, and heat preservation and standing are conducted. The method adopts a three-section temperature control mode to realize deep removal of tin element in tin-containing crude copper and effective recovery of copper.

The invention discloses a process for recovering refined tin from a tin-containing material, which comprises the following steps: acid leaching: leaching the tin-containing material by using a first acid solution to obtain a leachate; a reducing agent is added into the leaching solution, ferric iron in the leaching solution is reduced into ferrous iron, then an extracting agent is added for extraction, and the tin element is extracted to enter an organic phase; a second acid solution is added into the organic phase for reverse extraction, and tin-rich reverse extraction liquid is obtained; and electrolytic refining is conducted, specifically, the tin-rich strip liquor is electrolyzed, and refined tin is obtained. According to the method, the tin-containing material can be fully utilized, the leaching rate of tin is high, the purity of tin in the finally produced tin product is larger than or equal to 99.9%, high-efficiency conversion from the tin-containing material to the high-purity tin product is achieved, and good economic value and application prospects are achieved.

The invention belongs to the technical field of semiconductor material preparation, and particularly relates to a preparation method of a tin-doped gallium oxide single crystal material. The method comprises a sintering process, a charging process, a crystal growth process and a cooling process, the problems of volatilization and wrapping of tin oxide, agglomeration of powder and the like are solved to the greatest extent through a segmented sintering process and control of optimized doping components, uniform solid solution of tin elements in gallium oxide crystal lattices is ensured, the stability of the doping process is ensured, and the doping efficiency is improved. And the quality and performance of the sintered body are improved. On the basis, by regulating and controlling process conditions of a heating stage and a crystal growth stage, concentration fluctuation at an interface is further inhibited, and melt convection homogenization is promoted, so that the solid solubility and distribution consistency of the tin element in beta-Ga2O3 crystal lattices are improved, and the overall performance of the beta-Ga2O3 single crystal material is further improved; a high-quality and repeatable material basis is provided for subsequent device preparation, and the urgent demand of a power device and a deep ultraviolet photoelectric device on the high-performance beta-Ga2O3 single crystal substrate is effectively met.

The invention discloses a hexagonal phase silicon nanowire preparation method based on a gas-liquid-solid mechanism. The hexagonal phase silicon nanowire preparation method comprises the process steps of gold film deposition, chemical vapor deposition and the like. A stannic oxide precursor is introduced to participate in the growth process of the silicon nanowire by designing a self-compensation steam mechanism, and the characteristics of low melting point, low surface tension and low silicon equilibrium solid solubility of a tin element generated by disproportionation reaction of stannic oxide are utilized; on one hand, the thermodynamic driving force of hexagonal phase silicon nucleation is enhanced by dynamically improving the supersaturation degree of liquid drops, and on the other hand, the interface energy of the side wall of the nanowire is reconstructed by forming a tin wetting layer, so that the content of the hexagonal phase in the product is remarkably improved under the cooperative regulation and control of the dual action mechanism; and a simple, convenient, safe and efficient preparation way is provided for realizing the controllable growth of the high-purity hexagonal phase silicon nanowire.

The invention belongs to the technical field of transparent conductive films, and provides a preparation method and application of a rare earth doped nano tin oxide plating layer, the preparation method comprises the following steps: stannate, rare earth salt and urea are added into a solvent, the molar ratio of tin element to rare earth element to urea is 1: (0.005-0.3): (0.1-3), the solvent is stirred, and the rare earth doped nano tin oxide plating layer is obtained; the rare earth salt is at least one of lanthanum salt and samarium salt; carrying out solvothermal reaction, centrifugal precipitation, drying and dispersion to obtain a glue solution containing rare earth doped nano tin oxide; and depositing the glue solution on a to-be-deposited object to obtain the rare earth doped nano tin oxide coating. By doping the rare earth elements lanthanum and samarium, the carrier concentration of the tin oxide is effectively improved, the oxygen vacancy defect on the surface of the tin oxide is reduced, and the conductivity of the tin oxide is improved. The prepared plating layer has good optical transmittance and conductivity, the plating layer electrode has good electrode stability and weather resistance, the process is simple, and the method is suitable for industrial production.

The utility model relates to a tin stripping waste liquid recovery processing device which comprises a sedimentation tank, the sedimentation tank is connected with a new tin stripping liquid regeneration kettle through an oxidation tank, a centrifugal machine, a buffer tank, a multi-effect evaporator and a condenser in sequence, the centrifugal machine is further connected with a filter through a pyrolysis tank and washing equipment in sequence, and the filter is respectively connected with a dryer and a first post-processing tank. And the first post-treatment tank is also respectively connected with a second post-treatment tank and the multi-effect evaporator, and the second post-treatment tank is connected with an inlet of the new tin stripping liquid regeneration kettle. According to the recovery treatment device for the tin stripping waste liquid, the tin stripping waste liquid is recycled, dissolved tin elements, iron elements and copper elements are all recovered, maximum utilization of resources is achieved, no other waste is generated in the recovery process, and secondary pollution is eliminated.

The invention discloses an MgYSn-LDH coating and a preparation method thereof. The coating comprises an yttrium-containing magnesium alloy matrix layer, a tin gradient modified layer and an LDH layer growing on the tin gradient modified layer in situ. And the tin gradient modified layer has nanocrystalline and crystal defects. According to the method, FCVA and MEVVA composite equipment is adopted for pretreating the magnesium alloy matrix, tin is introduced through the ion implantation technology, the element content is controllable, the corrosion resistance can be optimized on the premise that the mechanical performance of the matrix is not changed, on the basis, the LDH coating grows in situ through the hydrothermal method, and the corrosion resistance and stability of the magnesium alloy are effectively improved.

The oxide sintered body of the present application contains a tin element, a tantalum element, and a niobium element. The area ratio of the hole portion per unit area in the cross-sectional observation of the oxide sintered body is 1% or less. The maximum equivalent circle diameter of the hole portion in the cross-sectional observation of the oxide sintered body is 20 μm or less. The maximum Feret diameter of the hole portion in the cross-sectional observation of the oxide sintered body is 50 μm or less. The relative density of the oxide sintered body determined based on the Archimedes method is 99.6% or more is appropriate. The bending strength of the oxide sintered body determined according to JIS R1601 is 180 MPa or more is appropriate.

The invention relates to the technical field of electrical contact materials, in particular to a SnO2 electrical contact material for a new energy electrical appliance and a preparation method of the SnO2 electrical contact material. The SnO2 electrical contact material comprises 8-15% of tin oxide, 0.5-3% of a composite additive, 0.1-2% of an accelerant and the balance of silver. According to the invention, yttrium ions and chromium ions can be partially dissolved in tin oxide crystal lattices, so that the thermal decomposition reaction of tin oxide at extremely high arc temperature is effectively inhibited, the material loss caused by tin element volatilization is reduced, the second additive generates a high-melting-point composite oxide phase after high-temperature calcination, and the high-melting-point composite oxide phase is uniformly distributed in a silver matrix; as a physical skeleton for resisting arc erosion, the accelerant mainly plays a role in dispersing and interface optimizing, and an interface compound containing zinc, lanthanum, boron and oxygen is formed after the accelerant is calcined, so that the wettability and binding force between tin oxide particles and a silver matrix are improved, uniform distribution of the tin oxide particles is ensured, local overheating and concentrated erosion are avoided, and the service life of the tin oxide particles is prolonged. Therefore, the mass loss of arc ablation is obviously reduced.

Embodiments of the present disclosure provide an oxide thin film transistor and a display device. Relate to the technical field of thin film transistor, for improving the on-state current and stability of oxide thin film transistor. The oxide thin film transistor comprises a gate, an active layer, a source and a drain. Wherein, the active layer comprises a first active layer and a second active layer which are arranged in a stack, and the first active layer is closer to the gate than the second active layer. The first active layer and the second active layer contain the same metal elements, and both contain at least two of indium element, zinc element, gallium element, tin element, aluminum element, titanium element, tantalum element, tungsten element and molybdenum element; the first active layer and the second active layer also contain oxygen element, and the crystalline state of the first active layer and the second active layer is different, and / or the content of oxygen vacancy of the first active layer and the second active layer is different.