392 results about "Aluminum element" patented technology

The invention relates to a magnetron sputtering system and a coating method thereof, the system comprises a pair of twin silicon target material and aluminum target material which are arranged in a coating chamber, the aluminum target material is located in the middle of a horizontal line where the twin silicon target material is located, the twin silicon target material is electrically connected with a medium-frequency power supply, and the aluminum target material is electrically connected with a direct-current power supply. According to the structural design, on one hand, the uniform deposition range can be expanded, the deposition difference of wide workpieces can be reduced, and the whole surface insulation consistency can be ensured, and on the other hand, the aluminum target realizes uniform doping of the aluminum element and stable control of the content, so that the toughness and binding force of the coating are improved, the influence on insulation is avoided, and the comprehensive performance of the non-conductive coating is remarkably improved.

The invention relates to the technical field of batteries, and discloses a battery, a battery pack and electric equipment, and the battery comprises a pole assembly arranged on a shell; the battery cell comprises a battery cell body and a tab part extending from the battery cell body, and the tab part is welded with the pole assembly to form a first welding printing area; wherein the tab part comprises an aluminum element, a manganese element and / or a silicon element, and the mass ratio of the manganese element and / or the silicon element is a%; a resistance test point is formed on the non-welding area of the tab part, the first welding printing area is located between the pole assembly and the resistance test point, and the resistance between the pole assembly and the resistance test point is b; the tab part comprises a plurality of tab layers which are stacked, and the thickness of each tab layer is c; a, b, and c satisfy 0.004 < = b * a / c < = 15. The lithium separation risk of the battery is reduced while the over-current capability between the pole component and the tab part is ensured and the voltage jump of the battery is avoided, so that the reliability of the battery is ensured.

The invention discloses a ternary positive electrode material, a preparation method thereof and an electrochemical device. The preparation method comprises the following steps: mixing a continuous ternary precursor, a lithium source and an aluminum source, and carrying out first sintering to obtain a first sintered product; the primary sintering product is subjected to secondary sintering and dispersion, a single-crystal base material is obtained, the base material comprises a plurality of primary particles, the average size of the primary particles ranges from 2 micrometers to 3 micrometers, and the median particle size Dv50 of the primary particles ranges from 3 micrometers to 5 micrometers; mixing the matrix material with an aqueous solution of lithium phosphate, and carrying out wet coating to obtain a coated product; and sintering the coated product for the third time, so that the lithium phosphate forms a coating layer on the surface of the matrix material, and the ternary positive electrode material is obtained. According to the invention, through two-parameter control of the average size and the median particle size of the matrix material and simultaneous aluminum element internal doping and lithium phosphate surface coating of the matrix material, the structural stability and the cycle performance of the ternary positive electrode material are improved and the service life of the ternary positive electrode material is prolonged through a synergistic effect.

The invention relates to the technical field of metal powder injection molding, in particular to an MIM titanium alloy binder and application of the MIM titanium alloy binder to preparation of high-plasticity TC4 parts. The MIM titanium alloy binder comprises polyformaldehyde, aluminum stearate, polyethylene, queen bee wax and high-density polyethylene. According to the MIM titanium alloy binder, polyformaldehyde serves as a main component, high-melting-point bee wax and aluminum stearate are introduced, the bee wax can improve the thermal stability of a lubricant, aluminum stearate can inhibit volatilization of Al element, the rheological property and sintering behavior of feeding are remarkably optimized, the number of titanium alloy feeding cycles and the density after sintering can be increased, and the O content can be reduced.

The invention belongs to the technical field of wastewater treatment, and particularly relates to multi-element doped synergistically modified ferrihydrite as well as a preparation method and application thereof, and the ferrihydrite is doped with at least one rare earth element and at least one of an aluminum element and a silicon element; the doping amount of the rare earth elements in the ferrihydrite is 0.5-20wt%; the doping amount of the aluminum element in the ferrihydrite is 0-20wt%; the doping amount of the silicon element in the ferrihydrite is 0-20wt%. Compared with the prior art, the method solves the problems that in ferrihydrite single-element modification in the prior art, although stability is improved through Al / Si doping, element modification in the same period is limited in improvement of the adsorption capacity, and the specific recognition capacity on phosphate radicals cannot be improved; and the anti-interference performance of the rare earth doped in the complex water matrix still needs to be improved. According to the scheme, rare earth and Al / Si doping are combined, so that improvement of phosphorus adsorption stability, adsorption capacity, specific recognition capability and anti-interference performance of ferrihydrite is realized synergistically.

The invention provides a functional filler, a preparation method thereof, an inorganic thermal control coating and application, and belongs to the technical field of coatings. The preparation method of the functional filler comprises the following steps: by taking a zinc acetate aqueous solution as a raw material, adding indium nitrate and aluminum nitrate, stirring and dissolving, then sequentially adding a complexing agent and a stabilizer, heating in a water bath to form transparent gel, and finally sintering at high temperature. According to the preparation method, a sol-gel method and a high-temperature sintering process are adopted to dope an indium element and an aluminum element into zinc oxide to prepare indium-aluminum co-doped zinc oxide, and then the indium-aluminum co-doped zinc oxide is used as a functional filler to be added into inorganic silicate resin to prepare the inorganic thermal control coating. The aluminum element and the indium element can synergistically act to improve the temperature resistance of the coating, so that the inorganic silicate coating with protection and thermal control effects is obtained, can be used on the surface of a spacecraft and has good thermal control and temperature resistance effects.

Disclosed in the present invention is a radiation-insensitive single-mode optical fiber, comprising a core, a first cladding, and a second cladding which are sequentially arranged from inside to outside, or comprising a core, a first buffer layer, a first cladding, a second buffer layer, and a second cladding which are sequentially arranged from inside to outside. The core, the first buffer layer, the first cladding, the second buffer layer, and the second cladding are all made of quartz glass doped with a cerium element, an aluminum element, and a fluorine element. The contents of the cerium element, the aluminum element, and the fluorine element are constant in the radial directions of the core, the first cladding, and the second cladding, respectively, and linearly vary in the first buffer layer and the second buffer layer, respectively. In the present invention, by regulating and controlling the contents of the cerium element, the aluminum element, and the fluorine element in the core, the first cladding, and the second cladding of the optical fiber, the stress distribution of the optical fiber is optimized, the residual stress is reduced, and the generation of fatigue bonds and wire drawing defects in the optical fiber is reduced, thereby improving the radiation resistance of the optical fiber.

The invention discloses a production method for reducing flaw detection defects of wind power gear steel, and belongs to the technical field of ferrous metallurgy. According to the method, an electric furnace-LF-VD-continuous casting process route is adopted, the mass fraction of an aluminum element Al in molten steel is controlled to be not lower than 0.018% in the LF refining process, and the mass fraction of [Al] is controlled to be higher than 0.010% all the time in the VD vacuum treatment process. And after VD vacuum breaking, aluminum is supplemented in time, the mass fraction of Al is increased to 0.015%-0.020%, calcium treatment is reasonably carried out, and the mass fraction of Ca in molten steel is controlled to be 0.0006%-0.0009%. By accurately controlling the component change of the molten steel in the VD process, the formation of CaO-MgO-Al2O3-SiO2 inclusions with high SiO2 content is effectively inhibited, the large-size ultrasonic flaw detection defects in the wind power gear steel are remarkably reduced, and the internal quality of the steel is improved. The method is simple in process and remarkable in effect, and has a good industrial application prospect.

The invention discloses a preparation method of a near-stoichiometric aluminum-doped silicon carbide fiber, which comprises the following steps: doping PMS with an aluminum element, blending with PCS, and sequentially carrying out melt spinning, non-melting treatment, high-temperature pyrolysis, high-temperature sintering and the like to obtain the aluminum-doped silicon carbide fiber with a C / Si atomic ratio close to an ideal value. And the near-stoichiometric ratio regulation and control of the silicon carbide fiber components are realized.

The invention provides a magnesium alloy, a magnesium alloy shell and electronic equipment. The magnesium alloy comprises the following components in percentage by weight: 2.5%-4.5% of aluminum, 0.5%-1.0% of zinc, 0.2%-0.8% of manganese, 0.01%-1.0% of titanium, 0.01%-0.5% of antimony and the balance of magnesium, additive elements and inevitable impurities, the additive element is a lanthanum-cerium mixed element, and the total weight percentage of the lanthanum element and the cerium element is 0.5%-1.5%. The magnesium alloy can be applied to a magnesium alloy shell, a small amount of low-price mixed rare earth (La / Ce) is added into an alloy of an Mg-Al-Zn system with the low Al content, the refining effect of trace Ti and Sb elements is matched, the corrosion resistance of the magnesium alloy can be greatly improved, meanwhile, the use amount of the rare earth element and the aluminum element is reduced, the manufacturing cost is reduced, and the service life of the magnesium alloy is prolonged. The method is suitable for mass production of electronic products.

A toner including: a toner particle; and an inorganic fine particle, wherein the inorganic fine particle contains a strontium titanate fine particle, a Si-containing protrusion portion is present at a surface of the strontium titanate fine particle, and the toner contains an amorphous polyester resin and an aluminum element at a surface of the toner particle.

The invention provides a laser welding method for a metal workpiece with an aluminum coating on the surface, at least two laser beams are symmetrically arranged in the welding advancing direction in the laser welding process, the quality factor M2 of the laser beams is smaller than 1.5, each laser beam irradiates a welding assembly, and the welding assembly is welded with the aluminum coating on the surface of the metal workpiece. More than two deep melting small holes and molten metal surrounding the small holes are formed; under the irradiation of laser beam energy, the welding zone of the assembly is melted to form an overall slender molten pool, and the front edge of the molten pool tends to the vertical advancing direction to form a nearly rectangular morphology front end; the multiple deep penetration small holes drive surrounding liquid metal to flow and enable an aluminum coating on the surface of the weldment assembly to be melted, and distribution of aluminum in a molten pool tends to be uniform. According to the method, multiple laser beams are provided to act on laser welding of butt joint of the steel with the aluminum coating, so that the aluminum element is uniformly distributed in a welding seam, the influence of aluminum on a welding joint is weakened, the method is low in cost and simple to operate, and the laser welding joint with excellent performance can be obtained.

The invention discloses a ZSM molecular sieve, a method for synthesizing the ZSM molecular sieve by using a decommissioned fan blade and application, and belongs to the technical field of solid waste recycling and high-valued.The decommissioned fan blade is subjected to pyrolysis and then subjected to primary calcination, and glass fibers are obtained; the preparation method comprises the following steps: grinding, crushing, mixing with alkali, carrying out secondary calcination, grinding, uniformly mixing with water, and carrying out solid-liquid separation to obtain a precursor solution containing silicon and aluminum elements; mixing with a template agent aqueous solution, and aging to obtain initial gel; and carrying out hydrothermal reaction, solid-liquid separation, drying, three times of calcination and grinding to obtain the ZSM type mesoporous molecular sieve. The glass fibers in the retired fan blades are used as silicon and aluminum sources, so that the dependence on high-cost raw materials in the traditional ZSM molecular sieve production process is reduced, and the production cost is remarkably reduced. The high-value utilization of the glass fiber in the retired fan blade is effectively realized, the glass fiber is converted into the ZSM molecular sieve with economic and industrial values, and the utilization rate of waste resources is increased.

The invention discloses a method for efficiently separating manganese, iron and aluminum in manganese oxide leachate step by step and efficiently recovering manganese, iron and aluminum, which comprises the following steps: by taking manganese dioxide and manganese slag leachate as a raw material, adjusting the acidity pH of the solution to be 1-2, adsorbing and removing iron ions by using resin, then adjusting the pH of the solution to be 2-4, and adsorbing and removing aluminum by using resin. And finally, extracting and separating to obtain a manganese-containing solution. Iron and aluminum on the chelate resin can be desorbed by hydrochloric acid, and the resin can be recycled. According to the method, manganese, iron and aluminum in the manganese oxide residue leaching solution are effectively separated and recycled through combination of ion exchange and an extraction method, manganese ions are selectively separated from the solution, separation of manganese from impurity elements such as aluminum and iron is achieved, the content of the impurity elements such as iron and aluminum in the manganese solution is reduced, damage of a traditional precipitation method to manganese is avoided, and the method is suitable for industrial production. The purity of manganese is integrally improved, and technical support is provided for preparation of high-purity manganese. Meanwhile, iron and aluminum elements in the solution can be effectively recycled.

The invention relates to the technical field of electrolyte materials, in particular to a halide solid electrolyte material containing doped metal and preparation and application of the halide solid electrolyte material. The invention provides the halide solid electrolyte material containing the doped metal, the structural formula of the halide solid electrolyte material containing the doped metal is shown as Li < 2 + x > Al < x > Hf < 1-x > Cl < 6 >, and x is greater than or equal to 0.1 and less than or equal to 0.4. By optimizing the content of an aluminum element and the content of a hafnium element in the solid electrolyte material and partially replacing Hf < 4 + > with a heterovalent metal Al < 3 + >, although a lattice gap is reduced, more Li < + > is introduced into a lattice, so that the transmission efficiency of Li < + > is higher, and the purposes of improving the ionic conductivity, the capacity and the cycling stability are achieved; and the content of Al metal in the earth crust is rich, so that the cost is low, the production cost can be further reduced, and the wide application rate of the product can be improved.

The present application discloses a copper-based catalyst, a preparation method therefor, and a use thereof. The preparation method for the copper-based catalyst comprises the following steps: mixing a zinc element precursor and an aluminum element precursor to obtain a first mixed solution, mixing a copper element precursor and an auxiliary agent precursor to obtain a second mixed solution, and preparing an alkaline precipitant solution, wherein the alkaline precipitant solution comprises a silicon dioxide precursor; mixing the first mixed solution with the alkaline precipitant solution, and precipitating a zinc component and an aluminum component to obtain a first suspension; adding the second mixed solution and the alkaline precipitant solution to the first suspension, and precipitating a copper component and an auxiliary agent to obtain a second suspension; and sequentially carrying out aging treatment, drying treatment, and roasting treatment on the second suspension to obtain a copper-based catalyst.

The invention relates to the technical field of ethylene selective oligomerization, in particular to a catalyst composition for ethylene selective oligomerization and a preparation method of alpha-olefin. The catalyst composition comprises a main catalyst and a co-catalyst, the main catalyst comprises a complex; a ligand of the complex is a compound as shown in a formula (I), and a coordination metal is a VIB-VIII family metal element; the cocatalyst comprises an organic compound containing an aluminum element. The catalyst composition can reduce the generation amount of a polymer and improve the yield of alpha-olefin, can maintain very high activity at high temperature, and has very good 1-octene selectivity.

This invention relates to the field of batteries and provides a battery in which the positive electrode active material contains aluminum and exhibits a bimodal particle size distribution, with the two peaks corresponding to particle sizes F1 and F2, respectively, in μm; F1 < F2; the negative electrode active material contains silicon-based and carbon-based materials; the battery satisfies the following relationship: (Ac / 400-1000 / (5×F1+2×F2))+(σ-(Ws+1)×(F3+50) / 2)≥407; where Ac is the mass content of aluminum in the positive electrode active material, in ppm; Ws is the mass content of silicon in the negative electrode active material; F3 is the particle size corresponding to the highest peak in the volume particle size distribution curve of the negative electrode active material, in μm; and σ is the fracture strength of the negative electrode current collector, in MPa. The battery of this invention has high energy density, as well as good cycle stability and electrochemical performance.

The invention discloses a method for treating indium raffinate, which comprises the following steps: mixing the indium raffinate with ammonium sulfate, and reacting to obtain a mixed solution; wherein the indium raffinate comprises aluminum ions; cooling the mixed solution to obtain an aluminum ammonium sulfate crystal; adding the aluminum ammonium sulfate crystal into water, and carrying out heating treatment to obtain an aluminum ammonium sulfate solution; adjusting the pH value of the aluminum ammonium sulfate solution to 4.5-5.5 to obtain an aluminum hydroxide precipitate; and calcining the aluminum hydroxide precipitate to obtain aluminum oxide. Therefore, according to the method, the aluminum element in the zinc hydrometallurgy system can be removed, the aluminum element is converted into an aluminum oxide product to be recycled, and good environmental protection benefits and economic benefits are achieved.

The invention belongs to the technical field of organic liquid hydrogen storage, and discloses a catalyst and a preparation method thereof, and hydrogenation and dehydrogenation methods of a liquid organic hydrogen carrier. The catalyst is used for hydrogenation and dehydrogenation of a liquid organic hydrogen carrier, the catalyst comprises a nickel element and an aluminum element, and the average particle size of the catalyst is 300-900 [mu] m. The catalyst provided by the invention has relatively high hydrogenation and dehydrogenation activity and long-period stability, meanwhile, the preparation cost of the catalyst is greatly reduced compared with that of a traditional noble metal catalyst, and further commercial application of an organic liquid hydrogen storage technology is facilitated.

The invention belongs to the technical field of coatings. The invention relates to a waterproof coating, in particular to a heat-insulating and heat-preserving waterproof coating and a preparation method thereof. The coating product is prepared from the following raw materials in parts by weight: 100 to 120 parts of hydroxy acrylic resin, 40 to 50 parts of composite reflective filler, 1 to 2 parts of dispersing agent, 30 to 40 parts of solvent propylene glycol methyl ether acetate, 10 to 12 parts of curing agent N3390, 0.3 to 0.5 part of flatting agent and 0.2 to 0.4 part of defoaming agent. The composite reflective filler comprises an inner core and a shell covering the surface of the inner core, the inner core is rutile type nano titanium dioxide; the shell is composed of aluminum oxide and silicon dioxide; the D50 of the rutile type nano titanium dioxide ranges from 260 nm to 300 nm; the average thickness of the shell is 50 to 60 nm; and in the shell, the molar ratio of the aluminum element to the silicon element is 1: (8-9).

The invention provides a modified cobalt catalyst and a preparation method and application thereof. The invention provides a modified cobalt catalyst which comprises a cobalt element, an aluminum element, a transition metal element, other metal elements of the group IIIA except the aluminum element, an alkali metal element, an alkaline earth metal element and a boron element, and the boron element exists in the form of a B-O-Al bond. The modified cobalt catalyst has the characteristics of high activity and high selectivity when used for reducing nitrile compounds.

The present application relates to the field of catalytic cracking of hydrocarbons, in particular to a silicon-aluminum molecular sieve catalyst, a preparation method and application thereof, and aims to provide a method for synthesizing a silicon-aluminum molecular sieve by mechanical ball milling, in which full-silicon molecular sieves are synthesized, and aluminum elements are selectively added into the full-silicon molecular sieves, so that the synthesized silicon-aluminum molecular sieve has appropriate acidity and good pore structure, and the ball milling process can form more defects on the outer surface of the full-silicon molecular sieve, thereby increasing the positioning space of aluminum.

This invention discloses a method for preparing and applying a magnetron sputtering-modified zirconium-aluminum osteogenic electroactive film, relating to the field of osteogenic film material technology. The method involves cleaning and drying a PVDF film; fixing the PVDF film onto a glass slide and placing it in a magnetron sputtering chamber; and depositing elemental zirconium and aluminum onto the PVDF film using magnetron sputtering to prepare the magnetron sputtering-modified zirconium-aluminum osteogenic electroactive film. The magnetron sputtering-modified zirconium-aluminum osteogenic electroactive film contains 46.15-46.35 wt% zirconium, 19.25-19.45 wt% oxygen, 19.25-19.45 wt% fluorine, and 1.77-1.97 wt% aluminum. The film material prepared by this invention possesses excellent biocompatibility, antibacterial properties, and osteogenic induction ability, expanding its application scenarios in the oral cavity and other parts of the body.

The invention belongs to the technical field of preparation of nano silicon materials, and particularly relates to a method for preparing nano silicon by etching a silicon-aluminum alloy and a nano silicon material thereof. Comprising the following steps: placing a pretreated silicon-aluminum alloy sample wafer in an etching tank containing a main etching solution, etching under the action of an alternating pulse electric field and ultrasonic-megasonic coupling, and adjusting the pH value to 2.5-3.0 by using acetic acid; quickly washing the silicon-aluminum alloy sample wafer subjected to main etching, putting the silicon-aluminum alloy sample wafer into an electrolytic cell containing a composite buffer solution of oxalic acid and sulfuric acid, and performing electrochemical fine etching under a direct-current constant-voltage electric field; and when the etching current density is reduced to 10% of the initial value, the reaction is terminated, and after low-temperature treatment and low-temperature vacuum drying, the nano silicon material with the residual Al content of 8-12 wt% and the O / Si atomic ratio of 0.15-0.25 is obtained. According to the invention, the problems of out-of-control components, structural damage and serious pollution in the prior art are solved, and the nano silicon material with controllable residual aluminum element and low oxygen-silica ratio can be stably prepared.

The invention discloses a method for preparing polyaluminum chloride from fly ash through mechanical activation and ammonium sulfate roasting and synchronously removing calcium, and particularly relates to the field of hydrometallurgy and solid industrial waste treatment. Adding ammonium sulfate powder into the ground fly ash obtained in the step S1, carrying out a roasting process, carrying out sulfuric acid leaching, adding calcium hydroxide at the same time, and carrying out solid-liquid separation; by adopting the ground fly ash, favorable conditions are created for roasting the ammonium sulfate powder and the aluminum compound. According to the technology, the aluminum element in the fly ash can be efficiently extracted within 30 minutes, resource utilization of solid waste is promoted, aluminum resources in the ash residues are recycled to the maximum extent, and the problems proposed in the background technology are solved.

The invention relates to a static sintering method and system for preparing aluminum hydroxide by extracting an aluminum element from fly ash, and the static sintering method comprises the following steps: firstly, taking a raw material which is crushed to a process control fineness as a pre-powder material, carrying out raw material preparation and blank forming on the pre-powder material to obtain a blank, sintering the blank to obtain a clinker, and sintering the clinker to obtain the aluminum hydroxide. The clinker is dissolved out to obtain slurry, and then the slurry is subjected to slurry desilicication, carbon component reaction, hydrogen-aluminum separation and drying to prepare high-whiteness and high-purity aluminum hydroxide; wherein the raw materials comprise fly ash; the blanks are sintered into polygon prism-shaped blanks, the polygon prism-shaped blanks are stacked on a high-temperature-resistant kiln car in an industrial tunnel kiln, the blanks are roasted in the industrial tunnel kiln, and the roasting temperature ranges from 800 DEG C to 1100 DEG C. According to the invention, solid wastes such as fly ash, coal gangue, carbide slag and the like, pulverized coal and sodium carbonate are crushed into materials with the same fineness, high-whiteness and high-purity aluminum hydroxide can be obtained through an alkaline static sintering process, the recovery rate of aluminum in the solid wastes is about 90%, and harmless, resource and synergistic utilization of the solid wastes such as fly ash and the like is realized.

The application discloses a silicon-aluminum target material and a preparation method thereof, and belongs to the technical field of target material preparation.The preparation method of the silicon-aluminum target material is different from the prior art, wherein the silicon powder and the aluminum powder are subjected to specific pretreatment to obtain a uniform silicon-aluminum alloy, and then the silicon-aluminum alloy is crushed into powder to be subjected to plasma spraying to finally obtain the silicon-aluminum target material.The product has low requirements on equipment, can realize scale production, and effectively solves the problems of aluminum element loss and uneven distribution in the preparation of the silicon-aluminum target material by the plasma spraying, and the aluminum element distribution error of different sites of the silicon-aluminum target material is only 0.2 wt%.

The invention relates to the technical field of analysis and detection, in particular to a method for analyzing an aluminum element in peanut iodized oil. The analysis method specifically comprises the following steps: sample pretreatment: fully reacting a to-be-detected sample with nitric acid, treating the to-be-detected sample in a water bath environment at 80-120 DEG C for 1-2 hours, and then carrying out microwave digestion; after the digestion is completed, treating in a water bath environment at 60-80 DEG C for 1-2 hours, and fixing the volume. Performing inductively coupled plasma mass spectrometry determination: respectively adding internal standard ISTD elements with the same concentration into the standard solution, the test solution and the blank solution, and performing determination; and preparing a standard curve by using the standard solution, and calculating the concentration of the aluminum element in the test solution by using the standard curve. Compared with the prior art, the analysis method provided by the invention not only has lower requirements on the sample dosage, but also has higher accuracy and lower detection limit.

The invention relates to the technical field of nano-coatings, and discloses a high-temperature self-lubricating wear-resistant nanocrystalline coating with a bionic structure and a preparation method thereof.The preparation method comprises the steps that nickel-chromium alloy and pure aluminum serve as target materials, a plurality of basic unit layers are sequentially and repeatedly deposited on the surface of a base material from bottom to top through the magnetron sputtering technology, and the high-temperature self-lubricating wear-resistant nanocrystalline coating with the bionic structure is obtained; the plurality of basic unit layers form a coating, each basic unit layer comprises a first layer and a second layer, the first layer of the lowest basic unit layer is combined with the base material, the second layer of the uppermost basic unit layer forms a surface layer, the first layer of each basic unit layer comprises Ni and Cr elements, the second layer of each basic unit layer comprises Ni, Cr, Al and optionally O elements, and the surface layer of each basic unit layer comprises Ni, Cr, Al and optionally O elements. And the O element content of the second layer of the plurality of basic unit layers is gradually increased along with the increase of the number of deposited layers. The components and the structure of the coating are constructed in a gradient manner through oxygen element doping and aluminum element deposition time regulation and control, so that the coating has excellent tribological performance at the temperature of 600-800 DEG C, and the long-term anti-attrition and wear-resistant protection effect can be achieved.