147 results about "Alumina composite" patented technology

The invention belongs to the technical field of ceramic materials, and particularly discloses whisker toughened zirconium oxide-aluminum oxide composite ceramic and an additive manufacturing method thereof, the composite ceramic comprises the following components by mass: 94 parts of zirconium oxide toughened aluminum oxide ceramic and 5 parts of silicon carbide whisker; the zirconium oxide toughened aluminum oxide ceramic is prepared from the following components in parts by mass: 76 parts of aluminum oxide and 24 parts of zirconium oxide, and 3mol% of yttrium oxide is added into the zirconium oxide. According to the whisker toughened zirconium oxide-aluminum oxide composite ceramic and the additive manufacturing method thereof, the preparation method has unique design of components and process, and the preparation of a high-density and high-performance ceramic-based composite material part based on a fused deposition modeling technology is successfully realized. Further, the prepared silicon carbide whisker toughened zirconium oxide-aluminum oxide-based composite ceramic has relatively high density and excellent obdurability.

The invention discloses a preparation method of a high-barrier aluminum oxide composite film for food packaging, and relates to the technical field of food packaging materials. The high-barrier aluminum oxide composite film for food packaging comprises the following raw materials in parts by weight: a barrier layer: 60-90 parts of modified nano aluminum oxide and 20-30 parts of a silane coupling agent KH-560; the functional layer is prepared from the following components in parts by weight: 18 to 28 parts of nano silver, 16 to 22 parts of compound antioxidant and 4 to 10 parts of nano titanium dioxide; the heat sealing layer is prepared from 22 to 32 parts of modified polylactic acid, 2 to 6 parts of graphene quantum dots, 12 to 16 parts of methyl methacrylate-butadiene-styrene copolymer, 3 to 6 parts of dodecyl trimethyl ammonium chloride, 10 to 14 parts of resorcinol tetraphenyl diphosphate and 7 to 17 parts of stearic acid intercalation modified nano montmorillonite. The high-barrier aluminum oxide composite film for food packaging is prepared by modifying nano aluminum oxide and polylactic acid, the barrier ability to gas, water vapor and ultraviolet rays is greatly improved, and the high-barrier aluminum oxide composite film is oil-resistant and antistatic. The product is high in mechanical strength, high in processing adaptability, capable of adapting to complex scenes, environment-friendly and safe.

The present invention relates to the field of ceramic technology, and specifically to a high thermal shock alumina composite ceramic and a preparation method thereof, comprising the following raw materials in parts by weight: 65-95 parts of an Al2O3-ZrO2 / ceramic fiber or whisker composition, 100-200 parts of deionized water, 8-12 parts of a plasticizer, and 2-15 parts of a low thermal expansion coefficient base material. The present invention reduces the thermal expansion coefficient of the alumina ceramic by adding ZrO2 / ceramic fiber or whisker to alumina, introducing ceramic fiber or whisker binary toughening while introducing ZrO2 phase change toughening, and introducing a unit with a lower thermal expansion coefficient or a negative thermal expansion coefficient. High-energy ball milling improves the uniformity of the powder interface, thereby improving the thermal shock resistance of the alumina composite ceramic. The method for preparing the ceramic is simple to operate, has high production efficiency, and low production cost. The ceramic round tube made of the alumina composite ceramic can meet the high thermal shock resistance requirements and can be widely used in environments with sudden temperature changes.

The invention relates to the technical field of hydraulic engineering materials, and particularly discloses a corrosion-resistant rubber dam and a preparation method thereof. The rubber dam is prepared by the following steps: forming a composite matrix (in a mass ratio of 60: 25: 15) by using ethylene propylene diene monomer (EPDM), brominated butyl rubber (BIIR) and hydrogenated butadiene-acrylonitrile rubber (HNBR), adding silane coupling agent modified nano zirconium oxide-aluminum oxide composite powder (ZrO2-Al2O3 with the particle size of 30-80nm) as a corrosion-resistant filler, and carrying out two-stage mixing and gradient vulcanization processes. The tensile strength retention rate of the obtained product in a corrosive environment with the pH value of 1-14 is larger than or equal to 92%, the ultraviolet aging resistance life reaches 30 years, the air tightness is improved by 5 times (the leakage rate is smaller than or equal to 2% / month) compared with a traditional EPDM dam, and the dam is suitable for high-corrosive water areas such as seawater backflow and acid rain.

The invention discloses a humidity response discoloration radiation refrigeration material which comprises a scattering layer and an iridescent photon film arranged on the surface of the scattering layer, the iridescent photon film is a cellulose nanocrystal / polyethylene glycol composite film, and the scattering layer is a polylactic acid-silicon dioxide-aluminum oxide composite nanofiber film. Through the composite design of the top cellulose nanocrystal / polyethylene glycol iridescent photon film and the bottom PLA / SiO2 / Al2O3 scattering layer, coupling of color mirror reflection of the color radiation refrigeration function layer constructed by CNC / PEG composite and broadband diffusion response of the electrostatic spinning film reflecting layer is achieved, and the negative effects of moisture absorption and color development on the reflectivity are reduced; color intelligent response and efficient radiation refrigeration are successfully combined; the preparation method is simple in process, the adopted raw materials are all degradable and renewable materials, the cost is low, and industrial popularization and application are easy.

The invention provides lithium ion negative electrode slurry based on a mesoporous alumina composite conductive agent, a lithium ion negative electrode plate and a preparation method, and belongs to the technical field of lithium ion batteries. The lithium ion negative electrode slurry comprises 95-97 parts by mass of graphite; 0.5 to 1.5 parts by mass of a composite conductive agent; 0.2 to 0.4 part by mass of sodium carboxymethyl cellulose; 1.3 to 1.7 parts by mass of polyacrylic acid; 0.4 to 0.6 part by mass of styrene butadiene rubber; wherein the composite conductive agent comprises carbon black and mesoporous alumina, and the mesoporous alumina and the carbon black form an ion-electron bicontinuous channel, so that transmission obstruction of lithium ions between a negative electrode and an electrolyte can be reduced, damage of a graphite structure in battery circulation can be inhibited, and falling and pulverization of graphite particles can be reduced; therefore, the effect of improving the negative electrode material is achieved.

The invention discloses a high-bending-resistance and low-dielectric-loss LTCC substrate preparation method and an LTCC substrate, and the method comprises the steps: mixing inorganic powder, an organic system and a solvent through ball milling, dissolving and stirring, and preparing a green ceramic chip through a tape casting technology; carrying out lamination, warm isostatic pressing, cutting, glue discharging and sintering on the green ceramic chip to obtain the LTCC substrate; the inorganic powder comprises sodium borosilicate glass, aluminum oxide and mullite whiskers. According to the invention, the sodium borosilicate glass is used as a glass phase, the mullite whisker and the alumina powder are used as ceramic phases, and the excellent mechanical properties and extremely low dielectric loss of the mullite whisker are utilized to modify the sodium borosilicate glass-alumina composite material. The problems that an existing sodium borosilicate glass-aluminum oxide LTCC composite material is low in bending strength and high in dielectric loss are solved.

The present application relates to the field of high-speed spraying technology, in particular to a supersonic flame spraying process for steam turbine blades. The present application overcomes the problems of insufficient coating bonding strength and poor corrosion resistance of the supersonic flame spraying. The present application uses nickel-coated alumina composite sand for sandblasting pretreatment of the blades to achieve micro-implantation of active nickel; adjusts the ratio of NiCr and Cr3C2-NiCr powders by using double powder feeders to build a gradient structure coating with continuous component change; uses a modified sealing agent containing nano-alumina for vacuum impregnation sealing; and finally obtains finished blades through graded vacuum diffusion annealing. Through surface nickel implantation, gradient structure design and diffusion annealing, the present application realizes metallurgical bonding and thermal stress matching between the coating and the substrate, greatly improving the bonding strength; at the same time, the in-situ ceramicization reaction of the sealing agent eliminates micro-pores, significantly enhancing the corrosion resistance of the coating.

This invention relates to the field of composite current collector base film materials, and discloses a heat-resistant and aging-resistant composite current collector base film and its preparation process. It is prepared by melt extrusion and stretching of the following raw materials in parts by weight: 100 parts PET resin, 12-25 parts multi-component composite reinforcing filler, and 0.5-3 parts lubricant. The multi-component composite reinforcing filler is prepared through the following steps: S1, halloysite nanotubes are composited with aminated mesoporous alumina, modified, and then loaded with an antioxidant to obtain functionalized halloysite nanotube-alumina composite particles; S2, magnesium oxide is deposited on graphene oxide, and modified to obtain a modified graphene oxide-magnesium oxide composite; S3, after blending, polymer grafting is performed to obtain the multi-component composite reinforcing filler. This invention, through the multi-component composite reinforcing filler in PET resin, can comprehensively improve the heat resistance, aging resistance, and bonding strength between the base film and the metal layer of the PET resin-based composite current collector base film.

The present invention relates to the field of catalyst technology, and more specifically to a mesoporous bifunctional catalyst, its preparation method, and application, and a method for preparing dicyclohexylbenzene. The mesoporous bifunctional catalyst has an average pore diameter of 5 nanometers or greater and contains at least 100 μmol / g of strong acid centers. The mesoporous bifunctional catalyst comprises: 10-30% by weight of an acidic silica-alumina composite; 50-65% by weight of an MCM-41 molecular sieve; 5-10% by weight of a solid superacid; and 1-15% by weight of a hydrogenation metal component. The mesoporous bifunctional catalyst has high catalytic activity and is used to prepare dicyclohexylbenzene, achieving high dicyclohexylbenzene yields and low reaction energy consumption.

The invention discloses a preparation method of a high-precision multi-channel tubular composite ceramic membrane. The preparation method comprises the following steps: step 1, preparing raw materials; step 2, preparing a polyacrylate-aluminum oxide compound; step 3, preparing coating slurry; according to the method, the membrane layer integrity of the multi-channel tubular ceramic membrane is improved, and the pore size distribution of the multi-channel tubular ceramic membrane is more concentrated. Due to concentration and reduction of the aperture, the multi-channel tubular composite ceramic membrane shows higher selectivity and rejection rate when filtering particles, which is particularly important for application occasions requiring high-precision filtration. In addition, the smooth surface of the membrane and the integrity of the membrane layer reduce the attachment of pollutants, so that the service life of the ceramic membrane is prolonged, and the maintenance cost is reduced.

The invention provides a diesel oil hydro-upgrading catalyst and a preparation method thereof. The catalyst prepared by the method is spherical and is composed of a molecular sieve, an active metal-amorphous silicon-aluminum compound and an active metal-aluminum oxide compound, the molecular sieve is a core, the active metal-amorphous silicon-aluminum compound is a middle layer, the active metal-aluminum oxide compound is a shell layer, and the thicknesses of the molecular sieve, the active metal-amorphous silicon-aluminum compound and the active metal-aluminum oxide compound can be flexibly adjusted. The catalyst has an open pore channel structure in stepped pore distribution, the pore diameter is gradually increased from inside to outside, the acidity is gradually reduced from inside to outside, the active metal content is gradually increased from inside to outside, the catalyst and the molecular sieve are distributed in a partitioned manner, and the change of the pore diameter, the acidity and the active metal content has the characteristics of coherence and small span. The catalyst is especially suitable for the hydrogenation modification process of straight-run diesel oil, the hydrogenation capacity and the ring opening capacity of the catalyst are highly matched, the yield of modified diesel oil is high, the BMCI is low, and the maximum production of high-quality ethylene cracking raw materials from straight-run diesel oil can be realized.

The invention discloses a high-temperature-resistant coating for towers and a preparation method of the high-temperature-resistant coating, and belongs to the technical field of coatings. Flame-retardant silane monomers containing pyrimidyl and nitrile group structures are introduced and condensed and hydrolyzed to form modified organic silicon resin, and the high-temperature-resistant coating for the towers is prepared by utilizing the high thermal stability of pyrimidine rings and the charring tendency of nitrile groups in the heating process. According to the present invention, by introducing the silane, the resin matrix can form the stable heat-resistant skeleton so as to significantly improve the structure retention ability and the thermal oxidation resistance of the coating at the high temperature, and by introducing the silanized fluorine-containing phosphate, the nano-silica and the nano-alumina composite filler, the inorganic phase can construct the compact barrier network in the coating so as to improve the thermal oxidation resistance of the coating; the heat resistance, flame retardance and corrosion resistance are further enhanced, the prepared coating shows excellent adhesive force, barrier property and long-term high-temperature stability in a high-temperature, humid and corrosive medium environment, the service life of a high-temperature tower in a complex environment can be effectively prolonged, and the coating has a good engineering application prospect.

The present invention discloses a slurry for battery separators, a preparation method thereof, and an application. The slurry comprises the following components: 0.2 - 0.7% of a dispersant, 0.1 - 0.5% of a wetting agent, 0.15 - 0.9% of a thickening agent, 5 - 10% of a binder, 13 - 40% of a hyperbranched polyacrylamide / modified alumina composite material, and the balance being ultrapure water. In the technical solution provided by the present invention, by using the hyperbranched polyacrylamide / modified alumina composite material and modifying the surface of alumina, alumina is bonded to hyperbranched polyacrylamide through Si - O bonds, avoiding the phase separation of alumina and hyperbranched polyacrylamide materials during high-speed dispersion; while the hyperbranched polyacrylamide material retains the dispersibility of the polyacrylamide material for the alumina slurry, it exhibits excellent solubility of the hyperbranched material, improves the problem that the alumina material is not easily dispersed in water, and shortens the dispersion time of the alumina material in water.

The invention discloses a carbon-aluminum oxide composite carrier and a preparation method thereof. The carbon-aluminum oxide composite carrier is spherical particles and comprises a carbon shell and an aluminum oxide core, the carbon shell contains rich macroporous channels, the content of C is 10-25 wt%, the content of Al2O3 is 75-90 wt%, the specific surface area is 250-480 m < 2 > / g, and the pore volume is 0.8-1.3 mL / g. The preparation method comprises the following steps: (1) uniformly mixing flour and inorganic alkali, and grinding to obtain alkali modified flour; (2) putting the aluminum oxide precursor into a turntable forming machine, and carrying out ball rolling forming to obtain aluminum oxide precursor microspheres; (3) putting the alkali-modified flour and the alumina precursor microspheres into a turntable forming machine, and rolling and forming to obtain a carbon-alumina composite carrier precursor; and (4) carrying out heat treatment on the carbon-aluminum oxide composite carrier precursor in a closed container, and drying and roasting the treated material to obtain the carbon-aluminum oxide composite carrier. The carbon-alumina composite carrier provided by the invention is suitable for being used as a catalyst carrier and an adsorption-separation material, and is especially suitable for the field of heavy residual oil hydrotreatment.

This invention discloses a fluidized bed hydrotreating catalyst, its preparation method, and its application. The hydrotreating catalyst includes a hydrotreating active metal component, a support, and optional auxiliary phosphorus. The support is a carbon-containing alumina composite support. The preparation method includes the following steps: (1) spheroidizing a first pseudoboehmite powder to obtain a first support precursor; (2) treating an aqueous solution of the first support precursor, an additive, and an organic polymer B to obtain a second support precursor; (3) treating the second support precursor, the second pseudoboehmite powder, and an acidic solution to obtain a third support precursor; (4) subjecting the third support precursor to low-temperature heat treatment to obtain a fourth support precursor; (5) mixing the fourth support precursor with an auxiliary solution, drying, and calcining to obtain an auxiliary-modified carbon-containing alumina composite support; (6) introducing a hydrotreating active metal component onto the composite support, followed by drying and calcining to obtain the fluidized bed hydrotreating catalyst.

The present application belongs to the technical field of special composite material preparation, and relates to a kind of fiber reinforced metal matrix composite material and its atmospheric pressure preparation process.Metal alloy matrix is added into induction furnace to heat to fully melt, and then cooled to solid-liquid mixed state;Alumina fiber surface is plated after cutting, put into induction furnace, and mechanically stirred to fully mix evenly;Temperature is raised and kept for matrix alloying, poured into mold, compacted and programmed cooling operation;Secondary temperature is raised and kept for subsequent aging treatment, and then naturally cooled to room temperature to obtain the product.The technical difficulties of large equipment required for preparing alumina composite material can be solved, the grain is refined, and the strength and density of the composite material are improved.The fiber content is controllable, and the composite configuration of particles and short, medium and long fibers is realized.The process is simple, the preparation cost is low, and special atmosphere protection is not required.

The present invention belongs to the field of polymer material technology, and specifically relates to a preparation method and application of a synergistic flame retardant. This technical solution uses alumina, high-crystallinity boehmite, and low-crystallinity boehmite to prepare a composite material through a specific preparation method. In this technical solution, the prepared alumina is first compounded with high-crystallinity boehmite, and then mixed with porous low-crystallinity boehmite. Under the action of ultrasound, part of the high-crystallinity boehmite / alumina composite enters the pores of the low-crystallinity boehmite to form a boehmite / alumina composite. When applied to thermoplastic plastic materials, part of the thermoplastic plastic material also enters the pores of the low-crystallinity boehmite, thereby preventing the aggregation of the boehmite / alumina composite. When combustion occurs, the thermoplastic forms a denser carbon layer through the framework of the boehmite / alumina composite, blocking heat exchange and improving flame retardant properties.

The invention relates to the technical field of catalysts, in particular to a cerium oxide-aluminum oxide composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing cerous nitrate, aluminum nitrate and water to obtain a mixed solution; the molar ratio of the cerium nitrate to the aluminum nitrate is 10: 1; and adding ammonia water into the mixed solution to carry out coprecipitation reaction, carrying out solid-liquid separation to obtain precursor powder, and calcining to obtain the cerium oxide-aluminum oxide composite material. By selecting raw materials and optimizing preparation steps and process parameters, the prepared catalyst has high activity. The high dispersion of Al2O3 on the carrier CeO2 and a proper crystal structure provide more effective active sites, so that the adsorption and conversion of reactant molecules are promoted. The cerium oxide-aluminum oxide composite material provided by the invention can be used as a catalyst to synergistically purify NOx and CVOCs, and has a matched reaction temperature window for oxidation of CVOCs and reduction of NOx.

The invention discloses a mesoporous alumina composite diaphragm, a preparation method and application. The composite diaphragm comprises a polar polymer layer and a porous alumina layer which are laminated. The polar polymer layer can reduce the charge transfer impedance of the lithium battery and improve the cycle capacity of the lithium battery; meanwhile, the polar polymer layer is rich in polar groups and can absorb a large amount of electrolyte; the porous aluminum oxide layer can reduce the stacking density of the diaphragm coating layer, so that the diaphragm is light; meanwhile, the problem that the porosity of the base membrane and the ionic conductivity are reduced can be solved; in addition, the porous aluminum oxide layer has a flat surface and can induce lithium nucleation homogenization, so that the growth of lithium dendrites is inhibited.

The invention provides a propane dehydrogenation catalyst and a preparation method thereof, and relates to the technical field of petrochemical engineering catalysts. The raw materials of the propane dehydrogenation catalyst comprise a carrier, an active component and an auxiliary active component, the carrier is a spherical silicon-aluminum composite carrier prepared by taking an SUZ-4-AlPO4-11 composite molecular sieve as a raw material; the active component is Pt; the auxiliary active component comprises Pt nano particles, an auxiliary active component and a surfactant. The specific carrier, the auxiliary active component and the active component Pt interact with each other, and the propylene conversion rate, the propylene selectivity and the propylene yield of the propane dehydrogenation catalyst prepared by the specific preparation method are remarkably improved.

The invention discloses a high-temperature-resistant piezoelectric micro-electro-mechanical transducer, which comprises a shell made of silicon carbide ceramic; the PMUT area array is positioned in the shell; the support is made of an aluminum oxide ceramic material and is arranged between the shell and the PMUT area array; the sound matching layer is coated on the PMUT area array and is made of an aluminum oxide-PDMS (Polydimethylsiloxane) composite material; and the NBPSC fireproof coating layer is coated on the sound matching layer. The transducer can resist high temperature of 1500 DEG C or above, and the problem that the performance of an existing PMUT is limited in a high-temperature environment is solved.

This invention provides a method and system for the directional loading of active components in a dimethyl carbonate synthesis catalyst, relating to the field of catalyst technology. The method includes pretreatment and surface modification of a porous silica-alumina composite oxide support; selective loading of cerium oxide nanoparticles onto the inner walls of the modified support pores using atomic layer deposition (ALD); directional bonding of palladium ions to the cerium oxide nanoparticles via microwave irradiation; and finally, reduction in a nitrogen atmosphere to obtain the catalyst. This method enables the directional loading of active components, improving the catalyst's activity and selectivity, and thus enhancing the synthesis efficiency of dimethyl carbonate.

The preparation method comprises the following steps: uniformly mixing a molecular sieve with a carbonyl sulfide hydrolysis catalyst, then adding a dispersing solvent, mixing by adopting a liquid-assisted grinding method, and then drying and calcining to obtain the carbonyl sulfide low-temperature chlorine-hydrolysis-resistant molecular sieve / alumina composite catalyst. The molecular sieve / alumina composite catalyst for carbonyl sulfide low temperature and chlorine hydrolysis resistance is obtained. The carbonyl sulfide hydrolysis catalyst is used as an active component of carbonyl sulfide hydrolysis reaction, and the molecular sieve aid is used for adsorbing, regulating and controlling a slow-release water-gas component and an HCl poisoning component, so that the low-temperature activity and chlorine poisoning resistance of the active component are improved; the composite catalyst provided by the invention reduces the reaction temperature for catalyzing hydrolysis of carbonyl sulfide, improves the chlorine poisoning resistance, realizes low-temperature, low-energy-consumption and stable removal of carbonyl sulfide in blast furnace gas, and solves the technical problem of deep desulfurization of blast furnace gas in the prior art.

This invention provides an alumina inert coating for silicon-based ceramic cores. The alumina inert coating is made from the following raw materials in parts by weight: 20-35 parts alumina composite ceramic powder and 65-80 parts coating additives; the alumina composite ceramic powder is made from the following raw materials in parts by weight: 86-100 parts alumina powder, 0.1-4 parts mineralization modifier, and 0.1-10 parts modified sintering aid. The alumina inert coating of this invention uses alumina as the coating material matrix, effectively isolating the silicon-based ceramic core matrix from the high-temperature alloy during the casting process. This significantly prevents interfacial reactions between the alumina and the high-temperature alloy during ceramic core casting, contributing to the dimensional accuracy of hollow turbine blades. The introduction of boron carbide, which is oxidized during high-temperature sintering to generate boron oxide, promotes the sintering process, making the material denser, reducing porosity, and further improving the strength and toughness of the ceramic core.

The application discloses an energy-saving halogen-free cable for intelligent building fire prevention, and relates to the technical field of building fire-fighting power supply and distribution cables. The cable comprises a cable core composed of one or more conductors, the conductors adopt copper alloy with electric conductivity of 60%IACS-90%IACS, and the surface is coated with a nano ceramic alumina composite coating; the conductors are coated with a halogen-free flame-retardant cross-linked polyolefin insulation layer, the insulation layer is provided with a filling layer in which phase change energy storage microcapsules are dispersed, the filling layer is wrapped with a ceramicized silicone rubber composite tape to form a heat insulation and fire resistance layer, the heat insulation and fire resistance layer is coated with a corrugated aluminum alloy interlocking armor layer, and the outermost layer is extruded with a thermoplastic elastomer outer sheath. The cable can slow down the heating of the conductors, reduce the thermal shock peak of the cable core, improve the line integrity and power supply retention capacity under fire conditions, and meet the requirements of low-smoke halogen-free, mechanical protection and bending laying, and is suitable for intelligent building fire-fighting linkage, emergency lighting, security monitoring and building control line systems.

The invention discloses an alumina composite zirconia ceramic ball and a preparation method thereof, and relates to the technical field of ceramics. The preparation method of the alumina composite zirconia ceramic ball comprises the following steps: mixing zirconia, alumina, cerium oxide, yttrium oxide and sodium oxide according to a specific ratio, and carrying out wet grinding, spray granulation, rolling molding, sintering and other processes to prepare the alumina composite zirconia ceramic ball. Compared with the prior art, the alumina composite zirconia ceramic ball prepared by the invention improves the hardness of a zirconia grinding medium, keeps good wear resistance, has excellent aging resistance, and solves the problems of high grinding wear, high impurity content introduction and short service life of the existing high-hardness material to a certain extent.

A preparation method of EDTA-modified alumina composite abrasive grains, characterized by comprising the following steps: adding α-alumina particles, NaOH, and 30 wt% hydrogen peroxide into deionized water, adding ethylenediaminetetraacetic acid into thionyl chloride, reacting at a constant temperature of 70 °C for 3 h until no gas is released in the reaction system, adding the hydroxylated alumina particles into N,N-dimethylformamide solvent, and ultrasonicating with an ultrasonic device for 30 min until the suspension is uniformly dispersed, and drying the obtained product in an oven at 50 °C for 20 h to obtain alumina-ethylenediaminetetraacetic acid abrasive grains. The preparation method and application of the EDTA-modified alumina composite abrasive grains of the present invention have the advantages of improving the material removal rate, effectively reducing the surface roughness of sapphire. Compared with conventional commercial alumina abrasive grains, the material removal rate of the alumina-ethylenediaminetetraacetic acid abrasive grains is increased by 101%, and the surface roughness is reduced by less than 65%.

The invention relates to the technical field of detergents, and provides a surfactant powder, a solid detergent, a washing consumable and a preparation method and application thereof, the surfactant powder comprises a carrier, and the carrier is mainly one or a combination of more than two of 4A zeolite, mesoporous ZSM-5 zeolite and a zeolite-alumina composite material; the liquid surface active agent is adsorbed on the carrier; the zeolite-aluminum oxide composite material is a composite material formed by coating mesoporous ZSM-5 zeolite particles with gamma aluminum oxide sol and then sintering. The surfactant powder still keeps powder properties in a room-temperature environment and under the condition of high content of a liquid surfactant, and the surface of the powder is kept dry, so that the problem that the addition amount of a traditional liquid surfactant in solid-form dishwashing consumables such as dishwashing powder and the like cannot be too high is effectively solved; and the stability and the cleaning capability of the dish washing consumables are improved.

The invention provides a humus-aluminum oxide composite material, application thereof and a soda alkali soil improvement method, and relates to the technical field of saline-alkali soil improvement. The invention provides a humus-aluminum oxide composite material. The humus-aluminum oxide composite material comprises natural humus and aluminum oxide. The natural humus material and the aluminum oxide adopted by the invention respectively show obvious advantages in the aspects of improving the organic matter content, the structural stability, the salinity regulation and control, the microbial ecology and the like of the soil. The two components are jointly applied to the saline-alkali soil, the physical-chemical-biological improvement effects of the two components can be synergistically exerted, the soil quality and the ecological function are improved, and a new path and theoretical support are provided for efficient and sustainable utilization of the saline-alkali soil.