229 results about "Boehmite" patented technology

The application discloses a porous aluminum-based carrier and a preparation method thereof, a CO2 adsorbent and application thereof. The preparation of the porous aluminum-based carrier comprises the following steps: segmental aging: a solution containing pseudo-boehmite is subjected to two-stage aging, the first stage is stirring aging, and the second stage is standing aging, the two kinds of aging modes are combined to improve the crystallinity of the pseudo-boehmite; organic solvent washing and pore expansion: the pseudo-boehmite is filtered out, and is subjected to water washing first and then organic solvent washing; segmental drying: low-temperature air blowing drying and vacuum drying are combined, the drying mode, the drying temperature and the solvent evaporation rate during drying are adjusted to avoid pore shrinkage or collapse caused by excessively high drying temperature and excessively fast solvent evaporation speed. The preparation of the porous aluminum-based carrier is simple in operation and low in energy consumption, and the CO2 adsorbent prepared from the porous aluminum-based carrier and an organic amine has excellent adsorption performance such as high adsorption capacity, fast adsorption rate and high stability.

The invention discloses a light diffusion polystyrene composite material with a low thermal expansion coefficient, a preparation method thereof and an application of the light diffusion polystyrene composite material in extrusion molding of a frameless television display screen backlight plate. The composite material is prepared from the following raw materials in parts by mass: 35 to 45 parts of GPPS (General Purpose Polystyrene) resin, 20 to 30 parts of HIPS (High Impact Polystyrene) resin, 8 to 15 parts of PPO (Polyphenylene Oxide) resin, 3 to 5 parts of compatilizer, 5 to 10 parts of light diffusant, 5 to 15 parts of filling mineral and 3 to 5 parts of liquid crystal polymer fiber, the filling minerals comprise one or more than two of high-whiteness nano synthetic mica, nano boehmite and magnesium sulfate whiskers; the whiteness L value of the high-whiteness nano synthetic mica is gt; 92; the average length of the magnesium sulfate whisker is 10-60 [mu] m, and the length-diameter ratio is gt; 30.

The invention relates to the field of inorganic material preparation, and particularly discloses pseudo-boehmite and a preparation method thereof. A preparation method of pseudo-boehmite comprises the following steps: (1) mixing an aluminum salt solution and an aluminate solution, adding a crystal form regulating agent, and stirring for reaction to obtain a sol system; the crystal form regulating agent is ZnS quantum dots modified by thiohydracrylic acid; (2) adding a pore diameter guiding agent into the sol system, and aging for 6-8 hours; the pore diameter guiding agent is a compound of a polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer and sodium citrate; and (3) carrying out solid-liquid separation on the aged sol system, and washing and drying the obtained solid to obtain the pseudo-boehmite. The proportion of 5-10nm pores of the pseudo-boehmite prepared by the preparation method disclosed by the invention reaches 90% or above, so that the pore distribution requirement of a fine catalytic reaction on the pseudo-boehmite can be met, and the efficient catalytic reaction is favorably realized.

The invention relates to the technical field of alumina material preparation, in particular to macroporous pseudo-boehmite and a combined preparation method thereof. The preparation method comprises the following steps: carrying out neutralization reaction on carbon dioxide and a sodium aluminate solution to obtain neutralized slurry; performing first aging treatment on the neutralized slurry to obtain first aged slurry; filtering the first aged slurry to obtain a solid-phase material and a liquid-phase material; sequentially washing and drying the solid-phase material to obtain a first macroporous pseudo-boehmite product; aluminum sulfate and the sodium aluminate solution are subjected to parallel flow neutralization, and aluminum hydroxide slurry is obtained; mixing the aluminum hydroxide slurry with the liquid-phase material, and then carrying out second aging treatment to obtain second aged slurry; performing post-treatment on the second aged slurry to obtain a second macroporous pseudo-boehmite product; and collecting the two macroporous pseudo-boehmite products in batches. According to the preparation method, pseudo-boehmite with different pore structure characteristics is respectively prepared through two neutralization technologies based on three mechanisms of staged treatment, material recycling and structure complementation.

The invention relates to a boehmite reaction kettle water circulation cooling system, and relates to the field of reaction kettle cooling equipment, the boehmite reaction kettle water circulation cooling system comprises a reaction kettle, a preheating tank, a water storage tank with a water inlet and a water outlet, and a heat exchanger, a cooling pipe is arranged in the reaction kettle, one end of the cooling pipe is a first water inlet end, and the other end of the cooling pipe is a first water outlet end; a heating pipe is arranged in the preheating tank, one end of the heating pipe is a second water inlet end, and the other end of the heating pipe is a second water outlet end; the second water inlet end is communicated with the first water outlet end; a water inlet of the water storage tank is communicated with the second water outlet end; the hot water inlet end of the heat exchanger is communicated with the water outlet of the water storage tank, and the cold water outlet end of the heat exchanger is communicated with the first water inlet end of the cooling pipe. The method has the effect of improving the energy utilization efficiency.

The invention relates to a ternary positive electrode material and a preparation method thereof, a positive electrode and a battery, the ternary positive electrode material comprises an inner core and a coating layer coating the surface of the inner core, and the coating layer is prepared by roasting raw materials including boehmite and aluminum oxide; wherein the mass ratio of the boehmite to the aluminum oxide is (1-2.33): 1. The surface of the inner core is coated with the coating layer prepared by roasting the raw materials including boehmite and aluminum oxide, so that the stability and the conductivity of the positive electrode coating layer can be improved, and furthermore, the Li < + > mobility is improved, the metal dissolution is reduced, the impedance is reduced, and the cycle performance is improved.

The invention provides diaphragm coating slurry, a composite diaphragm, a preparation method of the composite diaphragm and a lithium ion battery containing the composite diaphragm. The composite diaphragm comprises a porous diaphragm base material and a coating located on one side or two sides of the porous diaphragm base material, the coating comprises an active adsorption material, a coupling agent, a binding agent and a dispersing agent, the active adsorption material is selected from one or more of gamma-aluminum oxide, pseudo-boehmite, titanium hydroxide and a molecular sieve, and the coupling agent is selected from one or more of a coupling agent, a binding agent and a dispersing agent. The porosity of the composite diaphragm is greater than or equal to 40%. The composite diaphragm disclosed by the invention can greatly reduce the gas concentration in the battery, and meanwhile, the thermal stability, the electrolyte wettability and the porosity of the diaphragm are also improved to a certain extent.

Provided is a fluid catalytic cracking catalyst including faujasite-type zeolite, boehmite, a binder, and clay minerals, and satisfying the following formulas (1) and (2) in powder X-ray diffraction analysis:A / B≤1.2(1)A / C≥0.8(2)in the formulas (1) and (2), A is an integrated intensity of a diffraction peak attributed to (020) plane of the boehmite, B is an integrated intensity of a diffraction peak attributed to (120) plane of the boehmite, and C is an integrated intensity of a diffraction peak attributed to (331) plane of the faujasite-type zeolite.

The invention discloses a method for preparing gamma aluminum oxide nanosheets based on precise regulation and control of complex precipitation, which comprises the following steps: introducing an organic complexing agent into a water phase system, constructing an organic-inorganic mixed solvent environment, and inducing an aluminum precursor to generate two-dimensional oriented growth under an alkaline condition to obtain a flaky boehmite precursor; then carrying out high-temperature calcination to prepare gamma aluminum oxide nanosheets; the preparation method is simple in process, mild in condition and easy for large-scale preparation, and the prepared gamma aluminum oxide nanosheet can still keep stable sheet-shaped morphology and gamma phase structure after being re-sintered for five times at 1000 DEG C, has a hierarchical pore structure and a specific surface area of more than 40 m < 2 > / g, and shows excellent high-temperature structural stability; the material can be widely applied to the fields of high-temperature catalyst carriers, adsorption separation materials, advanced ceramics and the like, and has a good application prospect.

A catalyst for fluid catalytic cracking is provided which contains faujasite-type zeolite, boehmite, a binder and clay minerals and which satisfies the following formulas (1) and (2) in powder X-ray diffraction analysis: A / B ≤ 1 .2 A / C ≤ 0.8 where in formulas (1) and (2), A is the integrated intensity of a diffraction peak assigned to the (020) plane of boehmite, B is the integrated intensity of a diffraction peak assigned to the (120) plane of boehmite, and C is the integrated intensity of a diffraction peak assigned to the (33 1) plane of the faujasite-type zeolite.

The invention discloses polishing powder for an automobile paint surface and a preparation method of the polishing powder. The preparation method comprises the following steps: preparing a mixed solution; preparing a roasting material from the mixed solution and pseudo-boehmite, wherein the specific surface area of the roasting material is 30-60m < 2 > / g; grinding the roasted material to obtain aluminum oxide slurry; adding a coupling agent and a dispersing agent into the aluminum oxide slurry, and reacting under a stirring condition to prepare mixed slurry; and carrying out post-treatment on the mixed slurry to obtain the polishing powder of which the particle size distribution D50 is in a range of 0.6-0.9 mu m and the particle size distribution D100 is less than 10 mu m. According to the preparation method of the polishing powder, the prepared polishing powder has good polishing performance, the surface smoothness of a polished automobile paint surface is improved, the polishing powder is easy to store and transport, and the production cost can be effectively reduced.

The invention provides an iron-pollution-resistant catalytic cracking catalyst and a preparation method thereof, and the iron-pollution-resistant catalytic cracking catalyst comprises the following raw materials: a mesoporous and macroporous material, a zinc-aluminum composite material and a molecular sieve, wherein the mesopore and macropore material comprises kaolin and first zinc salt loaded in pores of the kaolin; the zinc-aluminum composite material is obtained by performing solid-phase ball milling on pseudo-boehmite and second zinc salt. The catalytic cracking catalyst provided by the invention has abundant mesopore and macropore structures and excellent iron resistance.

The application discloses a coal gangue-based composite fluorine removal agent and a preparation method and application thereof, and belongs to the technical field of fluorine removal materials. The preparation method comprises the following steps: mixing coal gangue and an alkali metal chloride aqueous solution to obtain a suspension, adding a soluble aluminum salt solution at 50 DEG C-95 DEG C, controlling the pH value to be 8-11, and generating a coprecipitation reaction to obtain a coal gangue-based composite fluorine removal agent with boehmite loaded on the coal gangue. In the preparation, the coal gangue is used as a carrier, and the boehmite is loaded on the surface of the coal gangue through a simple coprecipitation method, so that the coal gangue-based composite fluorine removal agent is obtained. According to the preparation method, the problem that the fluorine removal cost is high and the aluminum (hydrogen) oxide is prone to agglomeration when the aluminum (hydrogen) oxide is used as an adsorbent alone is effectively solved.

The application relates to the technical field of catalyst material preparation, and particularly discloses a monolithic spinel honeycomb catalyst, a preparation method and application thereof. The catalyst comprises a honeycomb carrier and a catalytic coating layer loaded on the surface and the inner wall of the pores of the honeycomb carrier, the catalytic coating layer has gamma-Al2O3 as a continuous phase, and spinel phase main active components, cerium oxide oxygen vacancy regulating components and lanthanum, strontium and magnesium oxide structure stabilizing aids are dispersed in the continuous phase. The preparation method comprises the following steps: preparing pseudo-boehmite into an aluminum sol, mixing the aluminum sol with a metal salt solution to obtain a doped aluminum sol, coating, and performing programmed temperature calcination, so that the active components are anchored on the surface of the gamma-Al2O3 in the form of spinel skeleton atoms, and a spinel-alumina-metal oxide composite structure is formed. The application effectively solves the problems of low utilization rate of active components, easy peeling of the coating layer and poor high-temperature stability of the traditional coating type monolithic catalyst, and has a wide application prospect in the efficient decomposition and treatment of N2O.

The invention discloses a boehmite crushing device and method based on instantaneous self-shunting, and belongs to the technical field of superfine powder processing. In order to solve the problems of over-crushing, high energy consumption, wide product particle size distribution, serious internal pollution and the like of the existing crushing device, the device comprises a vertical crushing cavity, a supersonic airflow nozzle is tangentially arranged on the side wall of the vertical crushing cavity, a static self-shunting unit is arranged at the top of the vertical crushing cavity, the static self-shunting unit comprises a central cone and an annular collecting channel, and a coarse powder loop is arranged at the bottom of the vertical crushing cavity. The method comprises the following steps: forming a strong rotational flow field by utilizing tangential supersonic airflow to collide and crush materials, realizing instantaneous self-shunting of coarse and fine powder by utilizing the synergistic effect of centrifugal force generated by rotational flow and central negative pressure, collecting and discharging the fine powder from the top, and recycling and circularly crushing the coarse powder from the bottom. According to the invention, crushing and sorting are carried out synchronously, the over-crushing phenomenon is eliminated fundamentally, and the device has the advantages of low energy consumption, uniform product granularity, high purity and easiness in control.

The invention discloses a high-conductivity and high-adhesion lithium ion battery diaphragm and a preparation method and application thereof.The high-conductivity and high-adhesion lithium ion battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises polyvinylidene fluoride-hexafluoropropylene copolymer, ceramic powder, functional filler, polyvinylpyrrolidone and solid electrolyte, the functional filler is a metal organic framework material, and the ceramic powder is at least one of aluminum oxide and boehmite. The slurry is prepared through a step-by-step method, it is guaranteed that the functional filler and the ceramic powder are evenly dispersed, the functional filler can construct a high-speed lithium ion transmission channel, the ceramic powder can synchronously improve the mechanical effect and the thermal stability of the coating, and finally collaborative optimization of the ionic conductivity, the mechanical strength and the thermal stability of the diaphragm is achieved; and the optimal performance balance is realized under the raw material ratio, so that the lithium ion battery diaphragm with excellent comprehensive performance is obtained.

The invention relates to a method for recycling copper tailings in a segmented and quality-divided manner, which comprises the following steps: S1, roasting the copper tailings to obtain roasted slag; s2, adding alkali into the roasting slag, dissolving, and filtering to obtain alkali-dissolved filter slag and alkali-dissolved filtrate; s3, adding an acid into the alkali dissolution filtrate for precipitation, and filtering to obtain an acid precipitation precipitate and an acid precipitation filtrate; s4, carrying out refining and hydrothermal reaction on the acid precipitation precipitate to obtain boehmite; and adding potassium salt into the acid precipitation filtrate, and performing evaporative crystallization to obtain potassium sulfate. According to the method, the copper tailings are treated through cooperation of roasting and alkali dissolution, sulphoaluminate can be decomposed, dissolution of sulfur and aluminum elements can be promoted, potassium sulfate and boehmite which are high in additional value are recycled in a segmented and quality-divided mode, and the comprehensive utilization rate of the copper tailings is remarkably increased. In addition, the problem that the building material expands and cracks due to sulfate can be avoided through recovery of the sulfur element in the copper tailings.

To provide boehmite in which a polymer dispersant is adhered or bonded to a particle surface and which does not exhibit dilatancy and is excellent in dispersibility. To provide a method for producing boehmite by adding a dispersant to a slurry of aluminum hydroxide and water and subjecting the slurry to hydrothermal treatment, by which boehmite not exhibiting dilatancy and excellent in dispersibility can efficiently be produced.SOLUTION: The present invention relates to boehmite in which a polymer dispersing agent is attached or bonded to surfaces of particles of the boehmite, the boehmite having a carbon content of 0.01% by weight to 0.17% by weight, an isoelectric point of pH2. 9 to 6.7, and exhibiting no dilatancy. The present invention relates to a method for producing the boehmite, including subjecting a slurry containing aluminum hydroxide, a polymer dispersant in an amount of 0.03% by weight to less than 1% by weight based on the weight of the aluminum hydroxide, and water to a hydrothermal treatment.SELECTED DRAWING: Figure 1

The application discloses a kind of halloysite-based adsorbents and its preparation method and application, belong to fluoride removal agent material technical field, soluble Al 3+ Salt solution is dropped into 50~95 ℃ halloysite and alkali metal Cl ‑ In the suspension formed by salt solution, pH value is controlled to be 8~11, co-precipitation reaction, Al 3+ And Cl ‑ Form [AlCl4] ‑ Coordination, hydrolysis boehmite type alumina and load in halloysite, obtain composite product;The composite product is calcined at 400~700 ℃, and halloysite-based adsorbent is obtained.The crystal form of the alumina loaded under the condition of pH=8~11 synthesized in the application is boehmite, and it can be converted into active alumina with relatively large adsorption activity to fluoride ion by calcining at 400~700 ℃, and the active alumina is mainly loaded in the inner / outer tube of halloysite, which is a wormhole porous structure, and the loading of active alumina improves the micropore ratio of the adsorbent, thereby improving the adsorption performance.

The invention discloses a magnesium oxide-containing high-performance composite crucible for smelting an aluminum-lithium alloy and a preparation method of the magnesium oxide-containing high-performance composite crucible, and belongs to the technical field of refractory materials. The preparation method comprises the following steps: mixing aluminum oxide, calcium aluminate, boehmite, magnesium oxide, chromic oxide, calcium fluoride, modified zirconium powder, aluminum oxide and a 5wt% aluminum dihydrogen phosphate solution to obtain a mixed material, and sealing and standing the mixed material to obtain a first mixed material; adding the first mixture into a mold, and carrying out static pressure treatment to obtain a blank; and carrying out gradient sintering on the green body to obtain the magnesium oxide-containing high-performance composite crucible. According to the prepared high-performance composite crucible containing magnesium oxide, the synergistic effect of the modified zirconium powder and various functional oxides is taken as a core, and a unique process is combined, so that the corrosion resistance is improved, and the problem of material deterioration caused by high activity of lithium element is solved.

The application discloses a pseudo-boehmite preparation device and relates to the technical field of chemical equipment. The device comprises a reaction kettle, an electrode column, a grid and a stirring shaft. The application further discloses a preparation method of the pseudo-boehmite preparation device, which comprises the following steps: material adding, colloid generating, aging, gibbsite converting and repeated material adding. The sodium aluminate solution and carbon dioxide are neutralized in the inner layer kettle to generate pseudo-boehmite colloid. Part of the gibbsite generated due to the slow decrease of pH value is precipitated at the bottom end of the inner layer kettle during the reaction process. The pseudo-boehmite colloid can directly enter the outer layer kettle for aging treatment after being generated. The gibbsite can be heated at the bottom end of the inner layer kettle to be converted into bayerite. The bayerite can enter the outer layer kettle for aging with the subsequent pseudo-boehmite, so that the gibbsite can be directly converted and recovered in the pseudo-boehmite preparation process.

The invention discloses a ball mill for boehmite production, and belongs to the technical field of ball mill equipment, the ball mill comprises a mounting rack and a ball mill body, the top of the mounting rack is provided with a feed pipe, the bottom of the mounting rack is provided with a transfer pump, and a discharge pipe is connected between the transfer pump and the bottom of the ball mill body; a stirring assembly is arranged in the ball mill body, two rotating shafts are fixed on the peripheral surface of the ball mill body, the mounting frame comprises two vertically arranged mounting plates, the end parts of the rotating shafts are rotationally connected with the side surfaces of the mounting plates, and rotating assemblies for driving the rotating shafts to rotate are arranged on the mounting frame. The rotating assembly is used for driving the rotating shaft to rotate, and the rotating shaft drives the top of the ball mill body to rotate downwards, so that workers can conveniently check the grinding condition in the ball mill body.

This invention discloses a method for preparing pseudoboehmite with high specific surface area and high conversion rate by sand milling and hydrolysis, belonging to the field of materials chemistry. The method involves using high-purity aluminum isopropoxide purified by vacuum distillation as a dispersant, and sand milling and stirring under specific pH, temperature, and vacuum conditions to complete the hydrolysis and aging process. Microwave drying is then employed to obtain a sample with a specific surface area >350 cm². 2 Boehmite powder with an alumina conversion rate of ≥76% per g can be used for the production of laser crystal-grade alumina and gem-grade alumina, and is also suitable for use as a catalyst support; moreover, the preparation method is simple to operate, easy to control, and easy to industrialize.

This invention belongs to the field of boehmite powder preparation technology, and discloses a high specific surface area boehmite powder and its preparation method. The method includes: firstly, deeply cooling a macroscopic system containing aluminum salts to build a macroscopic cold energy reserve; then, at the instant of pulsed injection of an alkaline precipitant into the solution, utilizing the micro-area adiabatic space built by pausing external cooling, allowing the heat generated by the neutralization reaction to perform in-situ annealing of the newly formed crystal nuclei; finally, using the macroscopic cold energy reserve to quench and lock the annealed crystal nuclei. This invention, by synergistically coupling external cooling and reaction heat in space and time, transforms the traditional process of step-by-step low-temperature nucleation and high-temperature aging, where performance is at odds, into a physical process that is synergistically completed within a single cycle, thereby solving the problem of simultaneously achieving the two core performance indicators of high specific surface area and high thermal stability.

The invention provides a composite nanofiber membrane and a preparation method and application thereof, the composite nanofiber membrane comprises a composite nanofiber, the composite nanofiber comprises a polyimide nanofiber and a boehmite ceramic layer coating the surface of the polyimide nanofiber, and the thickness of the boehmite ceramic layer is 150-500 nm. The composite nanofiber membrane provided by the invention has excellent mechanical properties, thermal stability and electrolyte wettability.

A method for producing a sheet phase pseudo-boehmite. The method includes: a) putting an organic acid into an aqueous solution in which an aluminum precursor is dispersed; and b) putting a product from the process of a) into a Taylor reactor, wherein a pressure of the Taylor reactor is 1 to 100 bar.

This invention discloses an alumina support and its preparation method. The alumina support includes an alumina matrix and first sheet-like alumina particles grown in situ on the outer surface of the matrix. The alumina matrix includes granular alumina particles and second sheet-like alumina particles. The size of the first sheet-like alumina particles is 100~600nm, and the sheet-like particles on the surface are stacked to form pores of 40-300nm. The preparation method is as follows: (1) Mix γ-phase alumina powder with propylene oxide aqueous solution and perform hydrothermal treatment to obtain sheet-like boehmite HP1; (2) Mix the sheet-like boehmite HP1 and boehmite P2 from step (1) to form an alumina support precursor; (3) Place the alumina support precursor in propylene oxide solution for a second hydrothermal treatment, and the treated material is used to obtain the alumina support. This alumina support has a rich macroporous content and can be used in macromolecular catalytic reactions, especially suitable for the hydrotreating process of heavy residue oil.

The invention discloses an alumina carrier with a special morphology and a preparation method thereof. The preparation method comprises the following steps: (1) preparing an ammonium bicarbonate solution and / or an ammonium carbonate solution as a hydrothermal medium; (2) uniformly mixing pseudo-boehmite with a hydrothermal medium, and sealing; (3) putting the sealed material into an ultrasonic reactor for ultrasonic pretreatment; (4) carrying out hydrothermal treatment on the pretreated material, and filtering and drying the material subjected to hydrothermal treatment to obtain fibrous ammonium aluminum carbonate powder; (5) uniformly mixing the fibrous ammonium aluminum carbonate powder and a forming aid, and then adding a solution prepared from a peptizing agent and water for mixing and kneading; and (6) extruding, drying and roasting the material to obtain the fibrous alumina carrier. According to the preparation method disclosed by the invention, distribution of active metals is promoted by improving the surface morphology of the carrier, so that the activity of the catalyst is improved.

The invention belongs to the technical field of coating preparation, and provides a fireproof heat-insulating nano ceramic coating for a lithium battery and a preparation method of the fireproof heat-insulating nano ceramic coating. The coating is a water-based two-component system, in a first component, bisphenol A diglycidyl ether, compound colloidal silicon dioxide, boehmite and nano zirconium oxide and / or nano aluminum oxide are used for constructing a ceramic skeleton, and aerogel, hollow glass beads, expanded vermiculite and / or flaky mica and inorganic fibers are combined to form a heat insulation network; the flame-retardant system contains ammonium polyphosphate, pentaerythritol, melamine components, zinc borate and sealing glass powder, silane interface bonding components and thermal expansion microspheres are introduced, an expansion thermal insulation layer is formed when the flame-retardant system is heated, and the flame-retardant system is densified into a hard shell at high temperature; the second component is a water dispersible amine curing agent; the preparation method comprises the following steps: adding the interface bonding components step by step, and sequentially compounding the inorganic phase and the flame-retardant heat-insulating phase to obtain the double-component packaged coating which is suitable for safety protection of a lithium battery system.

The invention relates to the technical field of thermal spraying materials, in particular to a preparation method and application of high-density yttrium-aluminum composite spraying granulation powder. The preparation method comprises the following steps: dissolving Y (NO3) 3.6 H2O and boehmite powder in deionized water to obtain a clear solution; under vigorous stirring, dropwise adding a precipitant into the clear solution, then adding urea, uniformly mixing, heating and continuously stirring until the reaction is complete and the solution becomes turbid; standing, collecting precipitate, washing and drying to obtain precursor powder; calcining the dried precursor powder in a high-temperature furnace to obtain YAG mixed powder; pouring the YAG mixed powder, a binder and an antioxidant into pure water, stirring, and carrying out ball milling to form composite slurry; performing spray granulation on the composite slurry to obtain spherical granulation powder; the uniform distribution of yttrium in the obtained granulated powder and the synergistic effect of BN remarkably improve the oxidation resistance and high-temperature stability of the coating; splashing and pores in the spraying process are reduced through the spherical particles, and the compactness of the coating is improved.