36 results about "Aluminium element" patented technology

The invention discloses a preparation method of a lithium-copper composite foil, which comprises the following steps: S1, a lithium-based alloy is selected and rolled to form a lithium alloy foil, and the alloy element in the lithium-based alloy is at least one of magnesium, zinc or aluminum; s2, selecting a piece of copper foil as a supporting framework; and S3, the two pieces of lithium alloy foil and copper foil are stacked together according to the sequence of lithium alloy foil-copper foil-lithium alloy foil, the stacked pieces of lithium alloy foil and copper foil are placed in a roller press to be rolled, metallurgical bonding is formed between the copper foil and the lithium alloy foil, and the lithium-copper composite foil is obtained. The invention adopts release-film-free rolling preparation, aims to solve the problem that lithium metal is easy to stick to a roller due to high viscosity and needs to depend on a high-cost release film in the prior art, simplifies the preparation process of the composite foil, reduces the manufacturing cost, increases the mechanical strength of the lithium-copper alloy foil, reduces the thickness, improves the energy density of the battery, and further improves the product quality and reliability.

The invention discloses a preparation method of a TC4 titanium alloy cast ingot. The preparation method comprises the following steps: determining a used residual waste component range according to target components of the TC4 titanium alloy cast ingot; the residual waste materials and the aluminum bars are evenly arranged in a feeding groove of the electron beam cold bed furnace; primary smelting is conducted through an electron beam cold bed furnace, and a primary cast ingot is prepared; and the primary cast ingot is smelted through a vacuum consumable electric arc furnace, and the TC4 titanium alloy cast ingot is prepared. Before material distribution, the loss amount in Al element smelting is calculated, and supplementation is carried out during material distribution, so that excessive loss of the Al element in EB smelting is made up, and the ingot casting quality is improved; the aluminum bars are uniformly distributed in the feeding groove, so that the burning loss of the aluminum element is balanced, the aluminum element in the cast ingot is uniformly distributed, and the phenomenon of macrosegregation is improved.

The invention belongs to the technical field of rare earth permanent magnet materials, and relates to a multi-component rare earth alloy diffusion source for improving the coercive force of a high-abundance neodymium-cerium-iron-boron magnet. The invention discloses a multi-component rare earth alloy diffusion source for improving the coercive force of a high-abundance neodymium-cerium-iron-boron magnet. The multi-component rare earth alloy diffusion source comprises rare earth elements and non-rare earth elements, the rare earth element is one or two of praseodymium element and holmium element; the non-rare earth element is a combination of an aluminum element and a copper element; the mass percent of rare earth elements in the multi-component rare earth alloy diffusion source is 80-95%, and the mass percent of non-rare earth elements in the multi-component rare earth alloy diffusion source is 5-20%. The invention further discloses a method for improving the coercive force of the high-abundance neodymium-cerium-iron-boron magnet and the prepared high-performance high-abundance neodymium-cerium-iron-boron magnet. The low-cost heavy rare earth element Ho is adopted as a diffusion source component, a Ho-rich (RE, Ho) 2Fe14B phase with a high magnetocrystalline anisotropy field is formed on the surface layer of main phase crystal grains, and the coercive force of the high-abundance neodymium-cerium-iron-boron magnet is improved.

The application discloses a vacuum metallurgy connecting method of high-silicon aluminum alloy, and relates to the technical field of diffusion welding, and comprises the following steps: S1, a high-silicon aluminum alloy workpiece to be welded is subjected to pre-welding treatment in a mode of friction stir welding, so as to increase the content of aluminum elements on the surface of the high-silicon aluminum alloy workpiece to be welded; and S2, the high-silicon aluminum alloy workpiece to be welded subjected to the treatment in the step S1 is subjected to diffusion welding under vacuum conditions, so as to obtain a high-silicon aluminum alloy workpiece after welding. The application has the advantages that the operation is simple, before the diffusion welding of the high-silicon aluminum alloy with high content of silicon elements, a process metallurgy method is used to perform pre-welding treatment on the surface to be welded, so as to increase the content of aluminum elements on the welding surface, further increase the contact proportion of aluminum elements on the diffusion welding surface, and finally realize the increase of the strength of the diffusion welding joint. That is, the advantages of the high-silicon aluminum alloy material are maintained, and the strength of the diffusion welding joint is improved.

The invention provides a method for selectively leaching titanium from red mud, and belongs to the field of red mud resourceful treatment. The method comprises the following steps: slurrying red mud to obtain red mud slurry; mixing the red mud with a deconstruction agent, and performing microwave activation to obtain active red mud; the method comprises the following steps: mixing active red mud with an acidic inhibitor, and carrying out wet impurity removal pretreatment to obtain a titanium-rich filter cake; and mixing the titanium-rich filter cake with a targeted leaching synergist for selective enhanced dissolution to obtain a titanium-rich solution. Firstly, a deconstruction agent is used for carrying out microwave activation on red mud, and the subsequent leaching reaction activity of the red mud is improved; then an acidic inhibitor is used for conducting wet impurity removal pretreatment on the active red mud, effective components in the acidic inhibitor can preferentially dissolve iron and aluminum elements in the red mud, meanwhile, dissolution of the titanium element is inhibited, and titanium is enriched in slag to obtain a titanium-rich filter cake; and finally, carrying out selective enhanced dissolution on the titanium-rich filter cake by using a targeted leaching synergist to realize selective efficient leaching of the titanium element.

According to this invention, it is possible to obtain a high-quality copper alloy additively manufactured product. This present invention provides a copper alloy powder for additive manufacturing used to create an additively manufactured product by an additive manufacturing method, in which the copper alloy powder for additive manufacturing contains not less than 1.3 wt % to not more than 12.5 wt % of an aluminum element, and a balance is formed by copper and unavoidable impurities. A manufacturing method of a copper alloy powder for additive manufacturing includes generating a copper alloy powder formed by adding not less than 1.3 wt % to not more than 12.5 wt % of an aluminum element to copper by a gas atomization method, and classifying the generated copper alloy powder into a particle size of not less than 10 μm to not more than 45 μm. A manufacturing method of a copper alloy additively manufactured product includes manufacturing a copper alloy additively manufactured product by an additive manufacturing apparatus using a copper alloy powder for additive manufacturing, and holding the manufactured copper alloy additively manufactured product at not less than 400° C. to not more than 600° C. for 1 hr.

The application provides a recovery method of nickel, cobalt, manganese and lithium. The recovery method comprises the following steps: step S1, sequentially disassembling, crushing, heat treating and removing magnetism of lithium battery recovery material to obtain black powder; step S2, decomposing the black powder by using acidophilic bacteria solution to remove copper elements and aluminum elements, and obtaining a decomposed product; step S3, acid leaching the decomposed product to obtain a leaching solution; step S4, fractionally extracting the leaching solution to obtain a raffinate, a manganese salt solution, a cobalt salt solution and a nickel salt solution; step S5, evaporating and crystallizing the raffinate to obtain a lithium salt solution; and step S6, independently co-precipitating the manganese salt solution, the cobalt salt solution, the nickel salt solution and the lithium salt solution to obtain manganese salt solid, cobalt salt solid, nickel salt solid and lithium salt solid. The recovery method provided by the application is helpful to improve the purity and yield of the recovery of nickel, cobalt, manganese and lithium.

The invention discloses a Mo-loaded ZSM-5-coated MCM-48 core-shell catalyst and a preparation method and application thereof, the preparation method comprises the following steps: synthesizing a ZSM-5 seed crystal by using a hydrothermal reaction, then carrying out epitaxial coating of MCM-48 by using an injection method to form a core-shell structure, and finally impregnating and loading Mo to prepare the Mo-loaded ZSM-5-coated MCM-48 core-shell catalyst, and applying the Mo-loaded ZSM-5-coated MCM-48 core-shell catalyst to a methane oxygen-free aromatization reaction. According to the invention, the ZSM-5 seed crystal is coated with the porous shell layer MCM-48 which does not contain an aluminum element to form a core-shell structure, so that the surface acidity of the ZSM-5 nano-particles is effectively adjusted, and excessive reaction and carbon deposition are avoided; and the catalyst is beneficial to mass transfer, promotes diffusion of aromatic hydrocarbon products and further inhibits carbon deposition, and the catalytic activity and stability of the catalyst are improved under the condition of lower Mo loading capacity.

The utility model relates to battery technical field discloses a cover plate of battery, the shell of battery, battery and battery group. The cover plate of battery includes: a plurality of board bodies of laminated settings, a plurality of board bodies include the top plate and the bottom plate in the opposite two sides of laminated direction, the top plate includes metal element, metal element includes at least one of aluminium element and copper element, the bottom plate includes titanium element, the outer edge of top plate is located the inside of the outer edge of bottom plate. Utilize the bottom plate containing titanium to play the supporting action, promote the structural strength of cover plate, and then enhance the overall rigidity, can improve the structural stability of battery significantly, the top plate contains copper and / or aluminium, copper and aluminium can all realize high quality connection through laser welding, ultrasonic welding, resistance welding etc. mode, is convenient for when welding busbar in the subsequent, and welding stability is higher, and then improve the welding reliability, enhance current transmission efficiency, improve the overcurrent capacity of cover plate and busbar.

This invention discloses a method for the integrated recycling and utilization of lithium phosphate aluminum ore extraction waste residue coupled with phosphate chemical industry. The method includes: reacting fluorosilicic acid, a byproduct of phosphate chemical industry, with ammonia water for ammoniation; refining the filter residue from solid-liquid separation into precipitated silica for recovery; and preparing the filtrate for recycling. The lithium phosphate aluminum ore extraction waste residue is reacted with dilute sulfuric acid, and solid-liquid separation is performed to remove acid-insoluble substances, yielding an acidified solution. The filtrate and acidified solution are mixed and reacted to obtain AlF3 precipitate. After solid-liquid separation, the AlF3 precipitate is further refined to remove impurities such as iron and phosphorus, yielding AlF3. The sulfuric acid phosphoric acid filtrate is added to ammonia water for ammoniation and neutralization to obtain sulfuric acid ammonium slurry. After concentration and drying, fertilizer containing NH4H2PO4+(NH4)2SO4 is produced. This invention features a simple process flow, achieving the industrial-scale integrated utilization of fluorine, silicon, phosphorus, and aluminum elements in the waste residue and byproducts in one step. It provides a new and efficient approach for the comprehensive recycling and utilization of lithium phosphate aluminum ore extraction waste residue for lithium phosphate aluminum ore extraction enterprises and wet-process purified phosphoric acid production enterprises, resulting in significant economic and social benefits.

The application provides a method for continuously removing impurities in a neodymium-iron-boron waste hydrochloric acid optimum solution in situ and application thereof, and the method comprises the following steps: adding the oxidized hydrochloric acid optimum solution into an overflow reactor, controlling the adding speed to make the oxidized hydrochloric acid optimum solution mix with the bottom liquid in the overflow reactor, adjusting the pH of the mixed solution of the hydrochloric acid optimum solution and the bottom liquid in the overflow reactor to a set value by using a neutralizing agent, so that the content of free iron ions in the mixed solution is lower than a set concentration, thereby obtaining a neutralized solution, and the obtained neutralized solution is aged to obtain a rare earth solution from which impurity elements are removed. The method realizes the hydrolysis and co-precipitation of iron and aluminum elements, and realizes the in-situ adsorption of impurity elements such as fluorine and boron by using the strong adsorption capacity of the hydrolysis product to fluorine and boron, thereby realizing the efficient removal of impurities such as iron, aluminum, fluorine and boron in the hydrochloric acid optimum solution. The method also reduces the entrainment loss of rare earth elements in the process of removing impurity elements, and improves the filtration performance of the impurity removal residue.

The invention discloses a method for preparing zirconium dioxide-loaded Friedel's salt by utilizing dealumination waste liquid and application of the zirconium dioxide-loaded Friedel's salt in defluorination, and belongs to the technical field of wastewater treatment and recycling and environmental functional material preparation. The invention solves the problem that the fluorine ion selectivity and adsorption capacity of the existing Friedel salt need to be improved. The aluminum element in the dealumination waste liquid of the decommissioned crystalline silicon solar cell is used as a Friedel's salt synthesis raw material, calcium hydroxide is added to adjust the molar ratio of calcium to aluminum, waste liquid recycling is achieved, a zirconium precursor is loaded through zirconium salt hydrolysis, and finally the zirconium dioxide-loaded Friedel's salt composite material is prepared through high-temperature calcination. The composite material has abundant anion exchange sites, can effectively adsorb fluorine ions, is used as a fluorine-containing wastewater fluorine removal agent, shows excellent fluorine removal efficiency, realizes waste resource utilization, and is beneficial to environmental protection and resource recovery.

The invention provides a modified lithium iron manganese phosphate positive electrode material, a preparation method thereof and a lithium ion battery. The modified lithium manganese iron phosphate positive electrode material comprises an inner core, and a shell and a protective layer which are coated on the surface of the inner core, the inner core comprises a lithium manganese iron phosphate material, and the doping concentration of the aluminum element in the shell is distributed in a sectional index increasing mode from inside to outside in the radial direction. According to the invention, the comprehensive performance optimization of the lithium manganese iron phosphate positive electrode material is realized, the doping concentration of the aluminum element in the shell is distributed in a sectional index increasing manner from inside to outside along the radial direction, and the cycle life and mechanical stress adaptability of the material are improved due to the design; meanwhile, the outermost protective layer can effectively reduce the interface impedance and improve the structural stability of the material. In conclusion, the modified lithium iron manganese phosphate positive electrode material realizes comprehensive improvement of material bulk phase stability, interface stability and conductivity, and has excellent comprehensive performance.

This invention discloses a method for preparing aluminum vanadate using waste SCR denitrification catalyst, comprising the following steps: (1) leaching the waste SCR denitrification catalyst with sulfuric acid and ammonium sulfite, filtering to obtain acid leaching solution and acid leaching residue; (2) oxidizing the acid leaching solution obtained in step (1) by passing ozone through it to obtain a precursor suspension; (3) subjecting the precursor suspension obtained in step (2) to a hydrothermal reaction, collecting the precipitate, filtering, washing, and drying to obtain aluminum vanadate. This invention also provides aluminum vanadate and its applications. The method for preparing aluminum vanadate using waste SCR denitrification catalyst of this invention comprehensively and efficiently utilizes vanadium and aluminum elements in the waste SCR denitrification catalyst. Without element separation, aluminum vanadate products are directly synthesized in solution and can be used as an adsorbent to adsorb uranium. This invention comprehensively utilizes both elements, greatly reducing waste liquid generation and shortening the process flow.

The present application relates to the technical field of solar cells. Disclosed are a solar cell and a photovoltaic module, so as to solve the problem of different regions of a cut face of a shingled solar cell varying significantly in terms of morphology, leading to a reduction in the efficiency of the solar cell. The solar cell comprises a first face and a second face opposite each other, and a side surface connecting the first face and the second face. The side face comprises: a cut face, the cut face comprising a cut edge adjacent to the first face and a fractured edge adjacent to the second face; and a first passivation layer formed on the cut face, the first passivation layer comprising an aluminum oxide passivation layer. The cut face comprises a first region adjacent to the cut edge and a second region farther away from the cut edge than the first region, with the ratio of oxygen to aluminum in at least part of the first region being greater than the ratio of oxygen to aluminum in at least part of the second region.

The present invention discloses a method for growing P-type 4H-SiC single crystals by the PVT method, belonging to the field of semiconductor technology. Before the growth of SiC single crystals, the Si surface of the SiC substrate is pretreated by electrochemical etching, specifically: the Si surface of the SiC substrate is exposed and the C surface is covered; the covered surface of the substrate is connected to a graphite electrode as the anode, and the cathode is selected from a graphite electrode or a platinum electrode; the anode and the cathode are symmetrically placed, the SiC substrate is placed in the electrolyte, and the power supply is connected to perform electrochemical etching on the growth surface of the substrate; the electrochemically etched substrate is continuously immersed in the electrolyte, then immersed in deionized water and ultrasonically treated, and finally dried with an inert gas. The method for growing P-type 4H-SiC single crystals by the PVT method provided by the present invention can provide more nucleation sites, reduce the nucleation energy of 4H on the Si surface, provide a window for the nucleation and growth of 4H-SiC, increase the doping of aluminum elements, and stabilize the growth of P-type 4H-SiC single crystals by performing electrochemical etching pretreatment on the Si surface of the SiC substrate before the growth of SiC single crystals by the PVT method.

The present invention discloses a multi-principal alloy / aluminum alloy bimetallic material and a preparation method thereof, comprising a multi-principal alloy and an aluminum alloy; the multi-principal alloy is selected from the AlCoCrFeNi series, AlBeFeSiTi series, AlCrFeMnTi series, AlCrTiV series, AlMgZnCuSi series, and the like; the aluminum alloy includes cast aluminum alloys and deformed aluminum alloys; and further comprises a surface-active element. In the present invention, the multi-principal alloy contains aluminum or an element with a high solid solubility or high diffusion capacity in aluminum. High-temperature heat treatment forms a solute-supersaturated transition layer at the interface between the multi-principal alloy and the aluminum alloy. Low-temperature heat treatment precipitates nano-precipitates in the transition layer, strengthening the interface between the multi-principal alloy and the aluminum alloy, thereby imparting to the bimetallic material excellent overall mechanical properties and interfacial bonding strength.

The present application relates to the technical field of laser cladding, and particularly relates to a laser cladding powder and a method for laser cladding on an aluminum alloy surface, the laser cladding powder comprising 10-20 wt% Ni, 2-5 wt% Al and 2-5 wt% Ti, and the balance being Cu; the method for laser cladding on the aluminum alloy surface comprising: taking the laser cladding powder as a cladding raw material, and adopting a positive defocusing cladding method to form a cladding layer on the surface of an aluminum alloy base body; the intermetallic compound generated by the copper element and the aluminum element has high hardness and high wear resistance, the solid solution of the nickel element in the copper alloy base body can further enhance the hardness of the cladding layer, the overall strengthened layer hardness is improved, and the titanium element can improve the plasticity of the strengthened layer, thereby preventing the overall coating from cracking and peeling off.

The invention provides a terminal electrode glass composition, terminal electrode copper paste, a multilayer ceramic capacitor and a manufacturing method of the multilayer ceramic capacitor. The termination electrode glass composition includes a first main component, a first sub-component, and a second sub-component. The first main component comprises an alkaline earth metal oxide; the first auxiliary component comprises a zinc element; and the second auxiliary component comprises an aluminum element and a silicon element. Based on 100 wt% of the terminal electrode glass composition, the first main component is 70 wt% to 75 wt%. Based on 100 wt% of the first main component, the first auxiliary component is 25 wt% to 30 wt%, and the second auxiliary component is 7 wt% to 11 wt%. Therefore, the terminal electrode has acid etching resistance, and the burning temperature in the multilayer ceramic capacitor process is reduced.

The utility model relates to the technical field of aluminum plates, in particular to a composite type heat preservation anti-collision aluminum plate. According to the technical problems, when an aluminum plate is used, the aluminum plate is generally mainly made of aluminum elements, other metal elements are added, the plate material is single, the aluminum plate is generally a single-layer aluminum plate, no additional heat preservation or anti-collision layer exists, and when the aluminum plate is applied to the special field, heat preservation and anti-collision performance is lacked; according to the technical scheme, the composite heat preservation anti-collision aluminum plate comprises an aluminum plate body, a reinforcing assembly, an anti-collision assembly, an anti-corrosion assembly, a dehumidification assembly, a heat preservation assembly and a connecting assembly. Compared with a traditional aluminum plate which is single in material, is usually a single-layer aluminum plate and is not provided with an additional heat preservation or anti-collision layer, when the aluminum plate is applied to special fields and lacks heat preservation and anti-collision performance, the aluminum plate can be arranged on occasions with special requirements for temperature control and anti-collision protection by arranging a composite structure, a heat preservation structure and a dehumidification structure, and the heat preservation and anti-collision performance of the aluminum plate is improved. The heat preservation and anti-collision performance of the aluminum plate can be effectively improved, and the durability of the aluminum plate is improved.

The invention relates to a positive electrode-solid electrolyte integrated structure, a preparation method and a solid-state battery, belongs to the technical field of solid-state batteries, and aims to solve the problems that the solid-state battery is poor in cycle performance and poor in reliability due to the fact that an interface between a solid electrolyte and an electrode material is unstable, low in ion transport kinetics and relatively high in interface impedance in an existing method. And the energy density is low. According to the preparation method, the aluminum element is doped by adopting an electrochemical method, the controllability of the preparation material is realized, the carbon-coated sodium-rich aluminum-doped titanium sodium phosphate is prepared by adopting the electrochemical method, high-temperature sintering preparation is avoided, the energy is saved, the product purity is high, and the preparation method is simple; the oxidation thickness is controlled by controlling pulse current, temperature and time, so that the thickness of the solid electrolyte is controlled, and the solid electrolyte with a certain thickness is prepared. The positive electrode and the solid electrolyte are prepared into an integrated structure without a contact interface, so that the interface contact resistance is greatly reduced, the cycle performance and the rate performance are excellent, and the energy density of the battery is improved.

The present application relates to a method for recovering phosphorus and aluminum from lithium iron phosphate battery lithium extraction waste residue, the preparation method comprising the following steps: (1) mixing lithium iron phosphate battery lithium extraction waste residue and alkali liquor, after the first leaching reaction, obtaining phosphorus aluminum leaching solution and leaching residue; (2) mixing the phosphorus aluminum leaching solution obtained in step (1) with calcium salt, after reaction, obtaining aluminate solution and phosphorus-rich residue. The present application extracts the phosphorus and aluminum components in lithium iron phosphate battery lithium extraction waste residue simultaneously, obtaining recyclable aluminate solution and phosphorus-rich residue, wherein the P2O5 content in the phosphorus-rich residue is ≥30%, which can be directly used as high-grade phosphate ore for wet-process phosphoric acid production. Through the above recovery steps, the recovery rate of phosphorus and aluminum elements both reaches more than 92%, realizing the high-value utilization of lithium iron phosphate battery lithium extraction waste residue; the recovery process and equipment are relatively conventional, the operation is simple and easy to implement, and it has strong practicality.

The application discloses a multi-scale cross-medium carbon pollution coupling flow direction modeling method based on process nodes, and belongs to the technical field of carbon pollution emission analysis. Based on long-process and short-process energy material metabolism in aluminum production process, aluminum element flow models and carbon pollution coupling emission flow models in long-process and short-process production processes are established. Based on the use of raw materials and energy in the production process, the transfer emission of CO2eq is calculated, and spatial transfer models at the provincial scale and the national scale are established. Based on multi-scale greenhouse gas emission and multi-medium pollutant emission data, a multi-medium emission factor model is established. The aluminum element flow model and the carbon pollution coupling emission flow model, the spatial transfer model and the multi-medium emission factor model are combined to establish a multi-scale cross-medium carbon pollution coupling flow direction model based on process nodes. The application focuses on the emission driven by spatial transfer, makes the analysis more rigorous and comprehensive, and realizes real-time monitoring of carbon pollution emission.

The invention provides a regeneration method of a retired lithium battery positive electrode material, a regenerated positive electrode material, a lithium ion battery and an electric device, and relates to the technical field of waste lithium battery recovery. The regeneration method comprises the following steps: carrying out primary calcination on a decommissioned positive plate in an oxygen-containing atmosphere to obtain decommissioned positive electrode powder; wherein a positive electrode active material in the retired positive plate comprises lithium-containing transition metal phosphate, and retired positive electrode powder contains an aluminum element; mixing the retired positive electrode powder with a lithium source, an organic carbon source and a phosphorus source to obtain a mixed material; and carrying out secondary calcination on the mixed material in a protective atmosphere to obtain the regenerated positive electrode material with the carbon / aluminum phosphate mixed coating layer. According to the regeneration method, the initial discharge gram capacity and the high-temperature cycle performance of the lithium ion battery prepared from the regenerated positive electrode material can be improved while aluminum-containing impurities are removed.

This application relates to a method for preparing recycled fluorite using desulfurized gypsum slag and waste electrolyte, belonging to the field of metallurgical engineering technology. This invention targets the hazardous solid waste of waste electrolyte generated during aluminum electrolysis, employing a desulfurized gypsum slag calcination-leaching-flotation process to convert soluble fluorides in the waste electrolyte into insoluble calcium fluoride. The waste electrolyte is mixed with desulfurized gypsum slag and calcined, converting the fluorine-containing phase into water-insoluble calcium fluoride, sodium into water-soluble Na₂SO₄, and aluminum into Al₂O₃. Na₂SO₄ is then separated into the liquid phase by water washing, leaving CaF₂ and Al₂O₃ in the washed residue. The washed residue is then subjected to flotation to separate CaF₂ and Al₂O₃. This method can produce a product with a CaF₂ purity greater than 80%, and lithium, sodium, and aluminum can also be recovered through comprehensive treatment.

The invention discloses a silicon nitride-based ceramic material and a preparation method of a ceramic bearing bush. The silicon nitride-based ceramic material comprises the following raw materials: silicon nitride and a sintering aid, the sintering aid comprises aluminum oxide, aluminum nitride and ytterbium oxide; the raw materials comprise the following components in parts by weight: 80-92 parts of silicon nitride, 2-4 parts of aluminum oxide, 3-8 parts of aluminum nitride and 3-8 parts of ytterbium oxide. By optimizing the material formula, the capacity of aluminum elements and oxygen elements in silicon nitride is improved, so that the silicon nitride has the characteristics of high strength, high hardness, high fracture toughness and high thermal shock resistance of silicon nitride and the characteristics of refractory property, corrosion resistance and oxidation resistance of aluminum oxide; the requirements of a high-aluminum-zinc unit on moderate hardness, good toughness and strong thermal shock resistance of a bearing bush material can be met.

The invention provides a magnesium alloy and a preparation method thereof, a magnesium product and a preparation method of the magnesium product. The magnesium alloy comprises a magnesium matrix as well as an aluminum element, a lanthanum element, a zinc element, a manganese element, an iron element, a silicon element, a copper element and a nickel element which exist in the magnesium matrix, in the magnesium alloy, the mass percentage of the aluminum element is 5.0%-8.0%; the mass percentage content of the lanthanum element is 1.0%-2.5%; the mass percentage content of the zinc element is 0.5%-1.5%; the mass percentage content of the manganese element is 0.1%-1.0%; the mass percentage content of the iron element is less than 0.004%; the mass percentage content of the silicon element is less than 0.05%; the mass percentage content of the copper element is less than 0.008%; the mass percentage content of the nickel element is less than 0.001%. According to the magnesium alloy provided by the invention, the yield strength, the tensile strength, the ductility and the casting fluidity of the magnesium alloy are improved by accurately controlling the types and the contents of all the elements in the magnesium alloy.

The invention relates to the technical field of laser cladding, in particular to laser cladding powder and a method for laser cladding on the surface of aluminum alloy, and the laser cladding powder comprises 10-20 wt% of Ni, 2-5 wt% of Al, 2-5 wt% of Ti and the balance Cu; the method for laser cladding on the surface of the aluminum alloy comprises the steps that the laser cladding powder serves as a cladding raw material, and a cladding layer is formed on the surface of an aluminum alloy matrix through a positive out-of-focus cladding method; an intermetallic compound generated by the copper element and the aluminum element has high hardness and high wear resistance, the nickel element is dissolved in a copper alloy matrix to further enhance the hardness of the cladding layer, so that the hardness of the whole strengthened layer is improved, and the titanium element can improve the plasticity of the strengthened layer and prevent the whole coating from cracking and stripping.

The invention relates to a preparation method of high-purity quartz sand doped with aluminum on the surface, which comprises the following steps: weighing an aluminum-containing medicament, dissolving with pure water, and stirring to form an aluminum salt solution; the method comprises the following steps: weighing a certain amount of high-purity quartz sand, adding an aluminum salt solution to form a turbid solution according to the aluminum content of the quartz sand and the number of aluminum elements needing to be doped, soaking for 1-30 minutes, removing most moisture through low-temperature drying, removing residual moisture through high-temperature drying, and finally uniformly mixing by using a mixer to obtain the high-purity quartz sand with the surface doped with the aluminum salt; the prepared high-purity quartz sand with the surface doped with the aluminum salt is placed in a high-temperature environment to be calcined, and the high-purity quartz sand with the surface doped with aluminum is obtained; and 3, washing the high-purity quartz sand doped with aluminum on the surface obtained in the step 3 with pure water, and drying and cooling after washing. The high-purity quartz sand with the aluminum content ranging from 10 ug / g to 16 ug / g is prepared by conducting surface aluminum doping on the quartz sand.

The application provides a magnesium alloy and a preparation method thereof, a magnesium alloy component and a preparation method thereof, and a vehicle, and belongs to the technical field of vehicle parts, and the magnesium alloy comprises the following components in percentage by mass: 8.9%-9.4% of an aluminum element, 0.5%-1.4% of a zinc element, 0.1%-1.0% of a gadolinium element, and 0.1%-1.0% of a yttrium element, and the balance is a magnesium element. The magnesium alloy provided by the embodiment of the application can have good tensile strength, yield strength and elongation by adopting the above-mentioned component formula, and meanwhile, the magnesium alloy has excellent corrosion resistance, and the application prospect of the magnesium alloy is improved.