168results about How to "Enhanced interface binding" patented technology

The invention relates to an S-doped g-C3N4 coated modified graphite material, a preparation method thereof and a lithium ion battery negative electrode. The method comprises the following steps: mixing a g-C3N4 precursor with a sulfur source, and then carrying out heat treatment under the condition of shielding gas to obtain sulfur-doped graphite phase carbon nitride S-g-C3N4; carrying out plasma modification treatment on the surface of the graphite material by adopting plasma reaction gas to obtain modified graphite; mixing S-g-C3N4 with the modified graphite to obtain a mixed material; and calcining the mixed material in a protective gas environment to obtain the S-doped g-C3N4 coated modified graphite material. The invention also provides the graphite material prepared by the method and a lithium ion battery negative electrode prepared from the graphite material. The graphite material has relatively high conductivity, interface compatibility and structural stability.

This invention provides a modified glass fiber, glass fiber reinforced butyl hot melt adhesive, and their preparation method. The modification method of the glass fiber includes: mixing a silane coupling agent with ethanol, stirring and hydrolyzing to obtain a silane coupling agent solution; placing the glass fiber in the silane coupling agent solution, stirring and reacting at 40-80℃ for 4-6 hours, then filtering, and curing the obtained solid product at 100-150℃ for 0.5-2 hours to obtain pre-modified glass fiber; immersing the pre-modified glass fiber in a toluene solution containing furanylsilane coupling agent, reacting under inert gas protection at 70-90℃ for 1-3 hours, and performing graft modification treatment to obtain the modified glass fiber. The use of silane coupling agent and furanylsilane coupling agent to introduce dynamic covalent bonds, synergistically modifying the glass fiber with a bilayer coupling agent, and introducing the modified glass fiber into the butyl rubber system, can effectively improve the mechanical properties and aging resistance of the butyl rubber while maintaining its original water tightness and air tightness.

The invention discloses microcapsule self-regeneration-based long-acting formaldehyde-removing cement and a preparation method thereof, and belongs to the field of building materials and environmental functional materials. The material is composed of Portland cement clinker and a functional composite additive, wherein the additive comprises Zn < 2 + > modified zeolite, a manganese-based catalyst, a pH-responsive sustained-release microcapsule and alpha-semi-hydrated gypsum. According to the invention, through the cooperation of zeolite selective adsorption, non-photocatalytic oxidation of the manganese-based catalyst in an alkaline environment and pH-triggered microcapsule self-regeneration, an adsorption-catalysis-regeneration function closed loop is formed, efficient and lasting removal of formaldehyde under a dark condition is realized, and the mechanical properties of a cement matrix are not damaged. According to the preparation method, the functional components are pre-compounded and then co-ground with the cement clinker, the process is simple, and the preparation method is suitable for industrial production.

The present application relates to a kind of environment-friendly water-based phenolic resin anticorrosive coating and its preparation process, belong to the field of coating technology.The coating is made of water-based phenolic resin emulsion, hyaluronic acid-lysine composition load nano SiO2-ZnO composite filler, synergistic anticorrosive filler, wetting dispersant, film forming aid, leveling thickener, defoaming agent and deionized water.The superhydrophilic of hyaluronic acid fundamentally solves the dispersion and storage stability problem of phenolic resin in aqueous phase, and the amino group of its lysine side chain can also chemically bond with resin during curing, significantly enhancing the adhesion, flexibility and interfacial bonding strength of coating.At the same time, nano SiO2, ZnO and synergistic anticorrosive filler construct a multiple synergistic anticorrosive network of physical shielding, sacrificial anode and chemical passivation, achieving long-term active protection.The whole system uses water as medium, selects bio-based raw materials and low VOC additives, and the environmental protection is outstanding.

The application belongs to the technical field of high polymer materials, and particularly relates to an anti-static polycarbonate composite carrier tape and a preparation method thereof. The application provides an anti-static polycarbonate composite carrier tape which is composed of the following components in parts by weight: 70-80 parts of silicon-containing polycarbonate, 8-10 parts of carbon black material, 6-8 parts of polyethylene terephthalate, 4-6 parts of polyolefin, 0.4-0.6 parts of antioxidant, and 0.4-0.6 parts of heat stabilizer. The preparation method of the silicon-containing polycarbonate comprises the following steps: first, performing a temperature rising reaction by taking hydrogen-terminated silicone oil and eugenol as raw materials to obtain phenolic hydroxyl silicone oil; and then mixing diphenyl carbonate, bisphenol A and the phenolic hydroxyl silicone oil to perform a copolymerization reaction to obtain the silicon-containing polycarbonate. The composite carrier tape can achieve good anti-static effect, and can also improve the thermal deformation temperature and mechanical properties of the material.

The application discloses an in-situ self-generating ceramic particle reinforced low-tungsten-content composite material, and a preparation method of the in-situ self-generating ceramic particle reinforced low-tungsten-content composite material.The low-tungsten-content composite material is composed of the following components in percentage by mass: W 59% to 69%, Ni 21% to 28%, Fe 9% to 12%, and ceramic reinforcing phase 1%.The tungsten content in the material system is greatly reduced, the toughness of the bonding phase is significantly increased, the plasticity and processing performance are improved, the W atoms in the bonding phase are difficult to diffuse to the surface of other W grains during the sintering process, the long-range migration is blocked, the W grain growth is effectively inhibited, the size of the in-situ generated ceramic particles is small, the distribution is uniform, the interface between the metal matrix and the ceramic particles is pure and firm, the strong dispersion strengthening and fine-grain strengthening effects can be produced, and the application of the low-tungsten-content composite material is suitable for the fields of aerospace, radiation shielding and precision instruments.

The invention discloses a degradable carton containing modified plant fibers and a preparation method of the degradable carton, and relates to the technical field of carton production. According to the degradable carton containing the modified plant fiber, the degradable carton is formed by splicing corrugated boards, and the corrugated boards are prepared from, by mass, 45-60 parts of the modified plant fiber, 25-35 parts of paper pulp, 5-10 parts of a biodegradable adhesive, 5-15 parts of filler, 1-5 parts of a reinforcing agent, 0.5-3 parts of a waterproof agent and 90-110 parts of deionized water. Through synergistic modification of alkali treatment and an exclusive interface coupling agent, hydrophilic hydroxyl groups on the surfaces of the natural plant fibers are effectively hydrophobized, and the interface compatibility and dispersion uniformity between the fibers and a paper pulp matrix are remarkably improved, so that the overall compressive strength and structural stability of the carton are greatly improved; the problem that the mechanical property is reduced due to direct use of natural plant fibers is solved.

The application discloses a preparation method of nitrogen-doped carbon-silicon nanofibers and application of the nitrogen-doped carbon-silicon nanofibers in a lithium ion battery negative electrode material, and belongs to the technical field of lithium ion battery negative electrode materials. The method comprises the following steps: mixing silicon nanoparticles and a carbon source, performing electrostatic spinning, stabilization treatment and carbonization treatment, and obtaining carbon-silicon nanofibers; and then mixing the carbon-silicon nanofibers with a nitrogen source, performing heat treatment under an inert atmosphere, making nitrogen elements doped into a carbon skeleton, and obtaining nitrogen-doped carbon-silicon nanofibers. The material obtained by the application is a one-dimensional nanofiber structure, silicon particles are uniformly wrapped in carbon fibers, and nitrogen elements are uniformly distributed in the carbon skeleton. The method can realize uniform nitrogen doping while maintaining the microstructure of the material, and significantly improves the electronic conductivity and interface stability of the material. The material obtained by the application is used as a lithium ion battery negative electrode, and exhibits high reversible capacity and excellent cycle stability.

The application discloses a composite nylon material preparation method, which is prepared by blending modified polytrifluoropropyl methyl siloxane containing hydrophobic trifluoropropyl side chains with nylon 6, realizing nanoscale dispersion in a melt extrusion process, adding an epoxy functionalized silane coupling agent and an organic tin catalyst, forming a three-dimensional crosslinked network under the hydrophobic effect of the trifluoropropyl side chains and the water blocking effect of the three-dimensional crosslinked network in the extrusion process, effectively blocking the diffusion channel of water molecules, improving the moisture resistance of the material, maintaining the tensile property of the raw material at 92-95%, and enhancing the wear resistance and thermal stability of the material by modified nanosilica; the equilibrium water absorption rate is only 0.7-0.9%, the low-temperature resistance is improved by more than 25%, and the low-temperature resistance is far superior to the embrittlement temperature of traditional PA6, so that the nylon material modification method has the advantages of maintaining mechanical properties, water resistance and low-temperature brittleness.

The invention discloses a high-flame-retardant EVA (Ethylene Vinyl Acetate) foaming material and a preparation method thereof, and relates to the technical field of high polymer materials. The high-flame-retardant EVA foaming material is prepared from a coated functional filler, a nitrogen-doped graphene-like carbon / cobalt nano composite material, EVA, stearic acid, zinc stearate, zinc oxide, a foaming agent AC and dicumyl peroxide, a core-shell combined filler composed of a coated functional filler and a nitrogen-doped graphene-like carbon / cobalt nano composite material is uniformly distributed in an EVA three-dimensional network cross-linked matrix to form a porous material with a uniform closed cell structure, so that the flame retardant property is improved by virtue of a physical barrier effect and a catalytic carbon formation mechanism, and an efficient and stable conductive network is also constructed; the antistatic performance is optimized, and the application range of the EVA foaming material is widened.

The invention discloses a preparation method of a graphene copper-based composite material, and belongs to the technical field of copper-based composite materials. The method comprises the following steps: (1) carrying out surface pretreatment on a copper foil; (2) dropwise adding the graphene dispersion liquid on the surface of the copper foil, and drying the copper foil after the graphene dispersion liquid is freely diffused until the graphene dispersion liquid covers the surface of the copper foil; (3) stacking the copper foils in a manner that a graphene layer is arranged between two layers of copper foils, and then sequentially carrying out cold pressing and hot pressing to obtain a hot-pressed composite material; (4) annealing the hot-pressed composite material to obtain an annealed composite material; (5) carrying out cold rolling on the annealed composite material to obtain a rolled composite material; and (6) the rolled composite material is subjected to annealing treatment, and the graphene copper-based composite material is obtained. On the basis of simplifying the preparation process and reducing the preparation demand conditions, the graphene is promoted to effectively and fully exert the strengthening effect, and the comprehensive performance of the composite material in multiple aspects is improved.

This invention discloses a modification method for nanocrystalline magnetic core encapsulation materials. The method includes: S1: surface functionalization modification of nano-silica and boron nitride nanosheets by grafting amino and epoxy groups, respectively; S2: blending and dispersing the modified inorganic nanofiller with low-viscosity bisphenol A type epoxy resin, flexible epoxy resin diluent, latent curing agent, and coupling agent under high shear force to form a uniform and stable modified epoxy resin composition; S3: plasma cleaning and activation treatment of the nanocrystalline magnetic core; S4: encapsulating the modified epoxy resin composition on the surface of the magnetic core using a vacuum pressure impregnation process, followed by programmed temperature curing. This invention significantly improves the mechanical strength, thermal conductivity, and heat resistance of the encapsulation layer and reduces the high-frequency dielectric constant and loss by constructing an organic-inorganic interpenetrating network and interface reinforcement.

The application belongs to the technical field of coated sand for casting, and discloses a composite heat-insulating coated sand with low heat conduction and high stability and a preparation method thereof.The coated sand comprises raw sand, phenolic resin, boron-silicon hybrid porous ceramic microshell modifier, heat-triggered boron-silicon-benzoxazine interface bridging microcapsule modifier, curing agent and lubricant.During preparation, the boron-silicon hybrid porous ceramic microshell modifier is mixed with preheated raw sand, and then the first part of phenolic resin, the heat-triggered interface bridging microcapsule modifier, the second part of phenolic resin, the curing agent and the lubricant are sequentially added to obtain the composite heat-insulating coated sand.The coated sand forms a layered structure of a raw sand core, a boron-silicon microshell heat-insulating inner layer, a benzoxazine bridging interface layer and a phenolic resin outer sealing layer, forms an interface bridging network in the core-making heating stage, and thus reduces heat conduction and improves thermal strength and storage stability.

This invention belongs to the technical field of EPDM rubber materials, specifically relating to a high-temperature resistant steel wire reinforced hydraulic rubber hose inner rubber and its preparation method. The preparation method of the high-temperature resistant steel wire reinforced hydraulic rubber hose inner rubber of this invention includes the following steps: S1, firstly, EPDM rubber is epoxidized using hydrogen peroxide solution to obtain epoxidized EPDM rubber, and then the epoxidized EPDM rubber is modified using 4-(trimethoxysilyl)aniline to obtain modified EPDM rubber; S2, the modified EPDM rubber and silicone resin are added to a mixer for the first stage of mixing, then filler, mica powder, plasticizer, zinc oxide, sulfur, accelerator, and antioxidant are added for the second stage of mixing, followed by discharge of the rubber to obtain the high-temperature resistant steel wire reinforced hydraulic rubber hose inner rubber. This invention, through the synergistic effect of its components, ensures both good heat resistance and significantly improves wear resistance.

The invention relates to the technical field of artificial board processing, in particular to a preparation method of green low-toxicity flame-retardant plywood. The method comprises the following steps: S1, green synthesis and step-by-step dipping treatment of a complexing phosphorus-nitrogen flame retardant; s2, preparation of a flame-retardant adhesive and construction of an interface intumescent flame-retardant system; s3, stepped layered assembly and hot press molding; s4, conducting ion regulation and anti-rust treatment; wherein the complexing phosphorus-nitrogen flame retardant in the step S1 takes phosphorus and nitrogen as core flame-retardant elements and is synthesized through a complexing rapid reaction and cross-linking reaction technology, the reaction temperature is 80-100 DEG C, and the reaction time is 30-60 minutes; the mass ratio of the phosphorus-containing metal complex precursor to the nitrogen source compound to the chitosan to the catalytic substance is (2-3): (5-6): (1-3): (0.5-1). According to the flame-retardant plywood prepared through the method, the combustion rate growth index is smaller than 100 W / s, the 600-s total heat release amount is smaller than 7.0 MJ, the smoke generation rate index of the smoke generation characteristic is smaller than or equal to 30 m / s, the 600-s total smoke generation amount is smaller than or equal to 50 m, and multiple technical defects of traditional flame-retardant plywood are overcome.

The invention belongs to the technical field of electrode paste preparation, and particularly relates to an efficient and environment-friendly electrode paste production process. A composite binder and a corncob powder-lignin composite carbonized precursor are prepared, hexamethylenetetramine-melamine resin is used as a composite cross-linking agent, the rigidity and thermal stability of boron modified phenolic resin in the composite binder are enhanced through a B-O bond, a phenolic hydroxyl group of the boron modified phenolic resin and plant pitch form a hydrogen bond, and the plant pitch is subjected to heat preservation and heat preservation. A hydrogen bond-covalent bond cross-linked network is formed under the action of the cross-linking agent, so that the high-temperature structure stability is guaranteed; the corncob powder fixes lignin through a porous framework, multistage pore channels are formed after carbonization, interface gaps are filled, the lignin is pyrolyzed at a high temperature to generate a carbon nano-whisker reinforced framework, thermal stress can be dispersed, interface bonding can be enhanced, and therefore the compactness and high-temperature stability of the electrode paste are improved. In addition, the bio-based composite binder is adopted to replace traditional petroleum-based asphalt, so that the emission of harmful substances is reduced from the source, and the environmental protection benefit and the high performance of the product are both considered.

This invention relates to the field of polymer materials technology, specifically to a method for preparing and applying a rigid polyimide foam reinforced with aluminum honeycomb. The method for preparing the rigid polyimide foam reinforced with aluminum honeycomb provided by this invention includes steps such as surface pretreatment of the aluminum honeycomb core material and fixing the pretreated aluminum honeycomb core material into a molding die. The rigid polyimide foam material reinforced with aluminum honeycomb obtained by this invention not only possesses high specific strength and high specific stiffness, but also inherits the excellent properties of polyimide foam such as high temperature resistance, flame retardancy, low smoke, and thermal insulation. The introduction of the aluminum honeycomb skeleton also improves the material's impact resistance and dimensional stability, making it an ideal multifunctional integrated lightweight structural material with promising application prospects.

The application discloses an environment-friendly flame-retardant master batch for crosslinked polyethylene and a preparation method thereof, and belongs to the technical field of high polymer flame-retardant materials. The flame-retardant master batch is prepared from LLDPE resin as a base material, an aluminum diethyl phosphinate, melamine polyphosphate and modified magnesium hydroxide to form a phosphorus-nitrogen-inorganic ternary synergistic flame-retardant system, the addition of sepiolite which is resistant to high temperature and flame-retardant, the modification of an interface by using a PE-g-MAH compatilizer, and the addition of compounded antioxidants, lubricants and anti-dripping agents, high-speed mixing, three-screw mixing, single-screw extrusion, surface grinding and cutting, magnetic selection and vacuum packaging. The flame-retardant master batch can make the crosslinked polyethylene material reach UL94V-0 grade with 10% of the addition amount, and has the characteristics of low smoke, environmental protection, low release, high mechanical property retention rate and the like, and is suitable for the field of electric wires and cables.

This invention relates to the field of wastewater treatment technology, specifically to a microbial preparation, its preparation method, and its application, comprising: a composite microbial agent; and a calcium alginate / polyvinyl alcohol interpenetrating network aerogel carrier loaded with the composite microbial agent; the aerogel carrier contains uniformly dispersed modified nano-attapulgite clay. The microbial preparation of this invention exhibits good wastewater treatment performance and long-lasting effect.

The invention discloses a cellulose fiber material and a preparation method thereof.The preparation method of the cellulose fiber material comprises the following steps that a metal salt solution and a lactic acid solution are added into dispersion liquid of cellulose fibers, and a mixed product is obtained; and carrying out pre-pressing treatment on the mixed product, and then carrying out hot-pressing treatment to obtain the cellulose fiber material. According to the cellulose fiber material and the preparation method thereof, the metal salt solution and the lactic acid solution are added into the dispersion liquid, and the ionic crosslinking and chemical crosslinking synergistic method is adopted, so that the interface bonding between cellulose fibers is improved, the bonding force between the cellulose fibers and water is weakened, and the dehydration efficiency of the cellulose fiber material is improved.

The invention relates to the technical field of engineering materials, in particular to a pumpable water-resistant anchoring agent as well as a preparation method and application thereof. The anchoring agent is a two-component system, wherein a component A comprises a first sodium silicate solution, a second sodium silicate solution, a catalyst, a chain extender, a nano inorganic filler and a super-hydrophobic coupling agent; and the component B comprises an isocyanate substance, a plasticizer, hydrophobic isocyanate and polyether polyol. Hydrophobic components are introduced into a polyurethane curing network in a chemical bonding mode, a chemical crosslinking type water-resistant mechanism is constructed, and the long-term bonding strength retention rate and the impermeability of the anchoring agent in the underwater environment are remarkably improved by cooperating with the double effects of physical hole plugging and chemical hydrophobicity of the nanofiller subjected to hydrophobic modification. Meanwhile, by optimizing the component proportion and viscosity, the product has excellent pumpability, and is especially suitable for anchoring construction in wet or underwater environments such as deep tunnels and water conservancy projects.

This invention discloses a heat- and impact-resistant protective conduit for MPP cables and its preparation method, relating to the field of polymer materials technology. The components, by weight, include: 20-22 parts of a toughening dispersion made from anhydrous ethanol and terminally epoxy-terminated hyperbranched polysiloxane; 33-35 parts of a boron-nitrogen co-doped carbon dot made from citric acid, boric acid, and urea, first compounded with phytic acid and piperazine, then compounded with modified zirconium phosphate prepared by hexadecyltrimethylammonium bromide intercalation, and then modified with silane coupling agent KH-560 to form a flame retardant synergist; 12-14 parts of polyolefin elastomer; 2-2.5 parts of magnesium aluminum hydrotalcite; 0.2-0.24 parts of antioxidant; 0.2-0.3 parts of calcium stearate; 0.2-0.3 parts of polyethylene wax; and 100-120 parts of polypropylene. The introduction of the flame retardant synergist and other raw materials in this invention effectively improves flame retardancy, aging resistance, impact resistance, low-temperature resistance, and heat resistance.

This invention discloses a wood-based composite phase change material and its preparation method, belonging to the field of phase change material technology. The preparation method of the wood-based composite phase change material is as follows: wood is cut and heated in a delignification solution, then removed and washed with water to obtain delignified wood; the delignified wood is added to a modification solution and heated, then removed, washed with water, and dried to obtain pretreated wood; polyethylene glycol, citric acid, and boric acid are mixed, heated, and stirred to obtain a phase change material; the pretreated wood is impregnated into the phase change material under vacuum, removed, and dried to obtain the final product; the modification solution is composed of an ethanol aqueous solution, a modified filler, 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane, and triethylamine. This invention uses delignification solution and modification solution to pretreat the wood, thereby enabling better bonding with the phase change material and preventing leakage. The resulting wood-based composite phase change material has excellent thermal management capabilities and stability.

The application provides a multistage composite microporous membrane electrode and a preparation method and water treatment and purification method thereof. The multistage composite microporous membrane electrode comprises an inorganic ceramic microfiltration membrane, an anode electrocatalytic active layer and a cathode electrocatalytic active layer; the anode electrocatalytic active layer and the cathode electrocatalytic active layer are respectively located on the two sides of the surface of the inorganic ceramic microfiltration membrane; the thickness of the inorganic ceramic microfiltration membrane is 2-6 mm, the thickness of the anode electrocatalytic active layer is 100-800 nm, and the thickness of the cathode electrocatalytic active layer is 1 micrometer-1 mm; the inner wall of the pore of the inorganic ceramic microfiltration membrane is loaded with silicon zeolite nanocrystals; and the particle size of the silicon zeolite nanocrystals is 50-200 nm. When the multistage composite microporous membrane electrode is used for water treatment and purification, oxygen molecules can be efficiently enriched in micropores, the conversion efficiency of hydroxyl radicals is improved, and the efficient removal of refractory organic matter is realized.

The invention belongs to the technical field of coatings, and particularly relates to a green and environment-friendly coating and a preparation method thereof. Comprising the following steps: (1) modifying a zeolite molecular sieve by adopting an amino silane coupling agent; (2) carrying out heating reaction on the carboxylated carbon nanotube and the modified zeolite molecular sieve, carrying out vacuum filtration, and drying to obtain a carboxylated carbon nanotube modified zeolite molecular sieve; and (3) uniformly mixing the waterborne polyurethane dispersion liquid, the carboxylated carbon nanotube modified zeolite molecular sieve and a coating additive to obtain the green and environment-friendly coating. According to the invention, a coupling agent is utilized to modify a zeolite molecular sieve, then a multi-dimensional enhanced network is constructed through reaction with functionalized carbon nanotubes, and the multi-dimensional enhanced network is added into a waterborne polyurethane matrix as a modifier, so that the path of corrosion factors is prolonged, and the interface bonding force between a filler and resin is enhanced; micro-permeation channels caused by interface gaps are reduced, so that the performance of the waterborne polyurethane coating is improved.

The application discloses a boride double-scale synergistically reinforced high-manganese steel-based wear-resistant casting and a preparation method thereof, and belongs to the technical field of wear-resistant metal materials and special casting. The casting takes high-manganese steel as a matrix, adopts micron-level TiB2 and nanometer-level ZrB2 to form double-scale boride reinforcing phases, controls the distribution of the reinforcing phases through a powder core wire mesh weaving technology, and forms a metallurgical bonding interface through spray deposition and isothermal annealing. The synergistic improvement of tensile strength, impact toughness and wear resistance is realized. The product is suitable for high-stress wear environments in the mining, metallurgy, building material and other industries, effectively solves the technical pain point that the strength and toughness of traditional high-manganese steel are difficult to be considered, the process is stable and controllable, and differential strengthening can be realized, and the product has industrial application value.

This invention relates to the field of laser cladding technology, specifically to a toughened and reinforced laser cladding alloy powder and its preparation process. It solves the problem of poor hardness and toughness of the cladding layer formed by existing laser cladding alloy powders during use. This laser cladding alloy powder incorporates scandium / erbium-loaded nano-silica and tannic acid-hydroxypropyl cellulose-coated boron nitride. Loading scandium and erbium onto the nano-silica improves the wear resistance and tensile strength of the cladding layer. Coating the boron nitride surface with tannic acid-hydroxypropyl cellulose powder improves the wettability between boron nitride and the metal matrix, reducing interface defects. The synergistic effect of rare earth elements and boron nitride reduces porosity and cracks in the cladding layer. It also improves density by refining grains and strengthening interfacial bonding, further enhancing the material's wear resistance and tensile strength, ensuring service life and reliability under high temperature and high stress environments.

The application relates to a laser cladding powder for a sand-collecting bucket spade tip surface of a sand-collecting vehicle, and raw materials are composed of the following components in percentage by weight: Ti: 42.7%, Al: 7.5%, Cu: 3.0%, C: 0.03%, B: 0.1%, N: 0.1, and the balance is Zr. The Zr-based powder component of the application basically guarantees the original component proportion of the powder, the thermal expansion coefficient of the cladding layer formed by the cladding powder is increased to close to 45 steel matrix, meanwhile, the interface bonding property of the cladding layer and the matrix is improved, and the powder has good cladding effect. Due to the undercooling effect of the Cu element component and the heterogeneous nucleation effect of the B element, the cladding layer structure forms fine solidification structure, and nano-hard coherent compounds (TiZr)3Al and non-coherent compounds TiC and TiN are formed, so that the hardness and wear resistance of the material surface are effectively improved.

This invention belongs to the field of building materials technology and relates to a radiation-cooled paving brick and its preparation method. The radiation-cooled paving brick comprises, from bottom to top, a base layer, a functional layer, and a surface layer. The functional layer comprises, by weight, the following raw material components: 20-50 parts cement-based binder, 20-50 parts radiation-cooling functional filler, 0-30 parts aggregate, 0.5-2.5 parts admixture, and 0.1-0.5 parts reinforcing fiber. Both the functional layer and the base layer of this invention are cement-based materials, resulting in strong bonding. Through the synergistic effect of the functional filler in the functional layer and the cement hydration products with radiation-cooling function, and with the surface coated with an inorganic nano-high-hardness self-cleaning surface layer, a highly efficient and long-lasting radiation-cooling effect can be achieved.

The application relates to the technical field of composite materials, and discloses a preparation method of a multilayer composite core body, which comprises the following steps: pretreatment, spraying treatment, core composite material preparation, compounding and curing forming; the surface of a fiber base layer is chemically modified through functional pretreatment, the wettability and reactivity of the fiber surface are improved, the different fiber layers with different functional characteristics can be more closely and stably combined, and therefore the integrity, reliability and durability of the multilayer composite core body structure are enhanced; through spraying treatment, functional particles are uniformly loaded on the surface of the fiber base layer in the form of a stable dispersion liquid; the functional particles have good compatibility and bonding force with the fiber base and the interlayer composite material after being treated and surface-modified in a specific manner, the core body is endowed with specific surface functions, the interface bonding between the fiber and the base is enhanced, and the functionality, uniformity and structural strength of the core body are improved.