30 results about "Two phase composite" patented technology

The invention discloses an aerogel / spacer fabric composite material as well as a preparation method and application thereof, and belongs to the technical field of thermal insulation materials. A three-dimensional spacer fabric with the upper surface layer being a hexagonal mesh structure and the lower surface layer being a chaining and weft insertion structure is selected as a substrate, the lower surface layer of the fabric is firstly filled with an aerogel coating in a coating mode, and then the fabric is completely filled with the coating on the upper surface layer; and drying to obtain the aerogel / three-dimensional spacer fabric composite material with better heat preservation effect and flexibility. The two-phase composite structure thermal insulation material obtained by the method has the characteristics of light weight, high strength and low thermal conductivity. Meanwhile, by adding the three-dimensional spacer fabric, the mechanical property of the material is effectively improved. The thermal insulation material can be used as a thermal insulation material for buildings, engineering, vehicles and the like, and is wide in application range and good in market prospect. The preparation process is simple, short in flow, mild in reaction condition and suitable for industrial production.

The invention relates to the technical field of composite material structure dynamics analysis, and provides a method and system for predicting the inherent frequency of a three-phase functionally graded composite material conical plate, and the method comprises the steps: employing an improved Halpin-Tsai model to calculate the equivalent parameters of a GPL-containing two-phase composite matrix, solving the equivalent parameters of a three-phase composite layer, and calculating the inherent frequency of the three-phase composite material conical plate. The method comprises the following steps: constructing a nonlinear geometrical relationship between a displacement field and a strain field, calculating a stiffness coefficient of each layer, constructing kinetic energy of the three-phase composite material conical plate, calculating an energy coefficient according to the stiffness coefficient of each layer, constructing potential energy of the conical plate according to the energy coefficient, and constructing a modal displacement function by adopting a Chebyshev polynomial and a boundary function. And establishing a characteristic equation based on a minimum potential energy principle and solving to obtain the inherent frequency of the three-phase composite material conical plate. According to the method, efficient calculation of the inherent frequency of the three-phase composite material conical plate is achieved, and the reliability and engineering application value of structural dynamics analysis are remarkably improved.

A magnetic material and method prepares high-performance composite ferrite for a self-biased circulator. The preparation method includes: (1) preparing BaM ferrite initial powder and NiCuZnSn ferrite initial powder, respectively; (2) mixing the BaM ferrite initial powder, the NiCuZnSn ferrite initial powder and deionized water uniformly in proportion, performing ball milling in a high-energy ball mill, and then obtaining mixed powder after primary pre-sintering, secondary pre-sintering and secondary ball milling; and (3) obtaining the high-performance composite ferrite for the self-biased circulator by a low-temperature magnetic field orientation forming technology and magnetic field heat treatment. According to the present invention, the saturated magnetization intensity is enhanced better by compounding the BaM ferrite powder and the NiCuZnSn ferrite powder and through a high-energy ball milling technology, the low-temperature magnetic field orientation forming technology and the magnetic field heat treatment technology, thereby improving the microstructure and the magnetic characteristic of bi-phase composite ferrite.

The invention provides a coal gangue aggregate concrete creep deformation prediction method and system, and belongs to the field of coal gangue aggregate concrete creep deformation prediction. The method aims at solving the problem that a coal gangue aggregate concrete creep performance prediction method does not exist at present. According to the method, a Counto model based on a two-phase composite material theory is utilized to construct an expression of influence of the coal gangue aggregate on a concrete creep final value and a creep development trend, the corresponding expression is introduced into an European standard EC2 creep model, and finally a coal gangue aggregate concrete creep prediction model is established. According to the method, the concrete creep final value amplification coefficient expression is introduced, the amplification coefficient is introduced into the European standard EC2 model, the creep deformation model expression and the amplification coefficient are not mentioned in an existing method, and the blank in the aspect of coal gangue aggregate concrete creep performance prediction is filled up; the effectiveness of the coal gangue aggregate concrete creep deformation prediction model designed by the invention is proved through tests.

The invention discloses a layered oxide positive electrode material cooperatively regulated by Cu, Zn, Fe and Mg, a preparation method, a positive plate and a battery, the layered oxide positive electrode material of the sodium ion battery provided by the invention has excellent electrochemical performance, the chemical formula is Na < 0.67 > Ni < 0.145-x > Cu < 0.1 > Zn < 0.05 > Fe < 0.07 > Mn < 0.635 > Mg < x > O < 2 >, and x < lt > is greater than or equal to 0; and 0.1. The positive electrode material prepared by the invention has long cycle stability, high rate capability and relatively low cost price, and further promotes the research and development of the positive electrode material of the sodium-ion battery; meanwhile, the positive electrode material provided by the invention is of a P2 / P3 two-phase composite structure, can well maintain structural stability, inhibit irreversible phase change and promote sodium ion transmission, and has more excellent electrochemical performance. In addition, the positive electrode material provided by the invention is simple in synthesis method, excellent in electrochemical performance and easy to produce on a large scale.

The invention discloses a method for predicting the elastic modulus of a carbon nanotube reinforced three-phase composite material, which comprises the following steps of: firstly, decomposing a carbon nanotube / carbon fiber / epoxy resin three-phase composite material system, and enabling a carbon nanotube to be equivalent to an effective fiber; a Halpin-Tsai semi-empirical equation is adopted to predict the mechanical property of the carbon nanotube / epoxy resin two-phase composite material; taking the predicted two-phase composite material as a two-phase matrix, establishing a representative volume unit of the carbon fiber / two-phase matrix, performing finite element discretization, and calculating a stress-strain field in the structure by solving an overall mechanical equation; and finally, determining the macroscopic stress-strain relationship of the carbon nanotube / carbon fiber / epoxy resin three-phase composite material by adopting a homogenization method, and solving the elastic modulus of the carbon nanotube reinforced three-phase composite material through a stress-strain equation. The method can predict the elastic modulus of the carbon nanotube / carbon fiber / epoxy resin three-phase composite material.

The invention relates to the technical field of composite material additive manufacturing, in particular to a reverse prediction method for a composite material additive manufacturing component with adjustable and controllable dielectric properties. The method comprises the following steps: preparing a plurality of composite material additive manufacturing components with different physical parameters through an additive manufacturing technology; testing to obtain a data set, wherein the data set comprises physical parameters and dielectric properties of the composite material; the data set is preprocessed and then input into a prediction model for training, and the trained prediction model is used for predicting the dielectric property of the composite material additive manufacturing component corresponding to the corresponding physical parameters. According to the method, the additive manufacturing technology is adopted for preparing the composite material additive manufacturing components with different physical parameters; according to the two-phase composite material, the dielectric property of the composite material additive manufacturing component under different additive manufacturing physical parameters is predicted through machine learning, and the method is low in preparation cost, simple in technological process and accurate in performance regulation and control and performance prediction.

The invention discloses a structure regulation and control method for an ultra-fine grain NbMoTaW-Cu composite material based on interface stability difference and a product obtained through the method, and belongs to the technical field of refractory high-entropy alloy and powder metallurgy. The preparation method comprises the following steps: firstly, preparing nanocrystalline NbMoTaW single-phase solid solution powder through mechanical alloying, and compounding the nanocrystalline NbMoTaW single-phase solid solution powder with Cu powder to obtain composite powder; then carrying out rapid hot pressing sintering to obtain a compact sintered body; and finally performing controllable heat treatment. According to the method, the difference of the thermal stability of the phase boundary and the grain boundary between the refractory high-entropy phase and the Cu phase is utilized, migration and redistribution of the Cu phase are regulated and controlled through the heat treatment temperature, then grain coarsening and phase size refinement of the refractory high-entropy phase are induced, and therefore a dual heterostructure containing the grain size difference and a two-phase composite area is formed in the composite material. The method is simple in process, good in repeatability and free of subsequent deformation processing. The obtained composite material has high strength and high plasticity, and has wide application prospects in the fields of aerospace, nuclear industry and the like.

This invention relates to a method and system for suppressing torque ripple during inter-turn short-circuit faults in permanent magnet synchronous motors (PMSMs), belonging to the field of fault-tolerant control technology for inter-turn short-circuit faults in PMSMs. The invention aims to address the shortcomings of existing technologies in suppressing torque ripple caused by inter-turn short circuits and the lack of system strategies for two-phase composite faults. First, mathematical models of the motor under normal, single-phase, and two-phase inter-turn short-circuit fault conditions are established to analyze the generation mechanism of torque ripple. When a single-phase inter-turn short circuit occurs, a compensation current is injected into the three-phase stator current to completely cancel out the torque ripple term. When a two-phase inter-turn short circuit occurs, the compensation components caused by each phase fault are calculated based on the principle of linear superposition and then injected together to obtain the three-phase reconstructed reference current. This invention can be used for the smooth and fault-tolerant operation of PMSMs after inter-turn short-circuit faults, and is particularly suitable for applications requiring high torque stability, such as electric vehicles and servo drives.

This invention discloses a beaded cobalt-doped Bi 25 FeO 40 The preparation method of / BiFeO3 nanofiber microwave absorbing material involves obtaining a precursor through a static method, then adding it together with bismuth nitrate, ferric nitrate, and a spinning aid into a mixed solvent composed of N,N-dimethylformamide and anhydrous ethanol to obtain a spinning solution. The spinning solution is then spun using electrospinning technology to obtain a nanofiber membrane. Finally, the material is obtained after drying and calcination. This microwave absorbing material increases the multiple reflections and scattering of electromagnetic waves, improving electromagnetic wave absorption performance. Furthermore, the heterogeneous interface formed after the two-phase composite further increases the interfacial polarization loss, resulting in a minimum reflection loss of -56.01 dB at a thickness of 2.33 mm and an effective absorption bandwidth of 6.32 GHz, covering the entire Ku-band.

The invention discloses a composite phase structure rare earth manganese compound catalytic material, a preparation method thereof and a catalyst, a rare earth manganese compound contains mullite phase REMn2O5 oxide and Mn3O4 phase oxide, the chemical formula of the rare earth manganese compound is (x) MnO alpha / (1-x) REMn (2-a) LaO (5-delta) D beta, RE is a rare earth element, L is a cation doping element, and D is an anion doping element; wherein in terms of mole number, 0.08 < = x < = 0.66, 1.27 < = alpha < = 1.45, 0 < = a < = 0.50, 0 < = delta < = 0.60, and 0 < = beta < = 0.10. A rare earth manganese compound with a mullite phase REMn2O5, Mn3O4 and other manganese oxide composite phase structure is constructed, a two-phase composite interface of the composite phase structure is constructed, the electron transfer and oxygen transmission capacity at the interface is improved, the NO adsorption and intermediate storage capacity of the catalytic material is enhanced, and the low-temperature catalytic oxidation capacity of the catalytic material to NO is improved.

The application discloses a kind of high-activity immune regulation bovine spleen peptide directional enzymatic preparation method, with slaughter waste bovine spleen as raw material, in turn through supermicro crushing coupling supercritical CO2 low-temperature degreasing, weak alkaline pH controllable aqueous extraction, four-element composite protease directional enzymolysis, activated carbon-yeast two-phase composite deodorization, multistage sterile filtration, double-effect low-temperature vacuum concentration, instantaneous temperature control spray drying preparation finished product;The application specific proportion four-enzyme fractional hydrolysis system and step-by-step coupling deodorization process, four enzymes are compounded according to (2-3) :(3-4) :1:1 to realize macromolecule pre-cut, immune characteristic peptide site retention, low-temperature adsorption is combined with yeast intracellular enzyme conversion to completely remove two kinds of fishy and bitter substances.The obtained product small molecule peptide ratio ≥90%, immunological activity is 35% higher than traditional process, fishy smell ≤1 level.The whole process protein extraction rate ≥88%, suitable for large-scale production, no irritating odor.

The application discloses a manganese oxide heterojunction catalyst and a preparation method and application thereof, and belongs to the technical field of catalytic materials. The manganese oxide heterojunction catalyst is composed of two manganese oxide phases of alpha-MnO2 and Mn2O3. The manganese oxide heterojunction catalyst is prepared from potassium permanganate and ammonium oxalate as starting materials through a hydrothermal method, a two-phase composite manganese oxide precursor is first prepared, phase transition of the precursor is realized through mechanical ball milling, and then the manganese oxide heterojunction catalyst is obtained. The preparation method provided by the application has the advantages of easy availability of raw materials, simple operation, and convenience for mass production, and the prepared catalyst has high intrinsic performance and rich active sites, can realize complete catalytic degradation of formaldehyde at 80 DEG C with high efficiency and stability, and has better comprehensive catalytic performance than most reported non-noble metal catalysts.

The present application relates to the technical field of composite structure dynamics analysis, and provides a method and system for predicting the natural frequency of a three-phase functionally graded composite conical plate, which comprises the following steps: calculating the equivalent parameters of a two-phase composite substrate containing GPL by using an improved Halpin-Tsai model, solving the equivalent parameters of a three-phase composite layer, constructing the nonlinear geometric relationship between the displacement field and the strain field, calculating the stiffness coefficient of each layer, constructing the kinetic energy of the three-phase composite conical plate, calculating the energy coefficient according to the stiffness coefficient of each layer, constructing the potential energy of the conical plate according to the energy coefficient, constructing the modal displacement function by using Chebyshev polynomials and boundary functions, establishing the characteristic equation based on the principle of minimum potential energy and solving it, and obtaining the natural frequency of the three-phase composite conical plate. The present application realizes efficient calculation of the natural frequency of the three-phase composite conical plate, and significantly improves the reliability and engineering application value of structural dynamics analysis.

This invention relates to a sodium-ion battery cathode material, its preparation method, and its applications, belonging to the field of secondary battery technology. The core of this cathode material is a two-phase composite of vanadium trioxide and sodium vanadium phosphate-based cathode materials. Vanadium trioxide possesses metal-like properties, and its intrinsic channel structure greatly facilitates ion transport. Therefore, the presence of vanadium trioxide can improve the low intrinsic conductivity of sodium vanadium phosphate-based cathode materials, enhancing their rate performance. Simultaneously, the localized structural distortion and chemical-mechanical coupling at the phase interface of the coexisting two phases accelerate ion and electron diffusion, generating additional electrochemical active sites and mitigating volume expansion, thereby enhancing structural stability. Furthermore, substituting vanadium elements at vanadium sites in the sodium vanadium phosphate-based cathode material with substitution elements mitigates environmental and cost issues caused by the inherent properties of vanadium. Finally, the carbon-based shell enhances the electronic conductivity of the cathode material.

The present invention belongs to the technical field of functional material preparation, and specifically relates to a method for preparing a thermoelectric composite material with the same composition and different structure. The preparation method comprises the following steps: Step 1: Mixing Co, Sb, and Se as raw materials, and placing them in a stainless steel ball mill; Step 2: Wet milling: Deoxidizing the ball mill and injecting a volatile liquid into the ball mill. The treated ball mill is fixed to a ball mill and wet milled at a predetermined speed for a predetermined period of time; Step 3: Drying: Drying the wet-milled product to obtain a dry powder precursor; Step 4: Pressing: Pressing the obtained dry powder precursor into a block; Step 5: Sintering: High-pressure synthesis of the pressed block to obtain a Pnm21 and P213 two-phase composite thermoelectric material. The present invention can produce high-performance thermoelectric materials suitable for operation in the temperature range of 500-700K, shortening the preparation cycle, improving repeatability, and reducing costs and energy consumption.

The invention provides two-phase composite material powder, a method for preparing the two-phase composite material powder based on cooperation of a sol-gel method and spray drying and application of the two-phase composite material powder, and belongs to the technical field of composite material preparation. The preparation method comprises the following steps: carrying out spray drying and calcination on a sol precursor aqueous solution containing a first-phase metal source and a second-phase metal source to obtain two-phase composite material powder; the first-phase metal source and the second-phase metal source independently comprise nitrate and / or acetate, metal elements in the first-phase metal source comprise first rare earth metal and first transition metal, and metal elements in the second-phase metal source comprise second rare earth metal and / or second transition metal; and when the first-phase metal source and the second-phase metal source in the sol precursor aqueous solution are both nitrate, the sol precursor aqueous solution also comprises alpha-hydroxycarboxylic acid. The two-phase composite material powder prepared by the method provided by the invention has uniform components, and is suitable for large-scale production.

The invention provides a Mo2C-Na2Mn8O16 composite material with synergistic lattice strain and a preparation method of the Mo2C-Na2Mn8O16 composite material, and belongs to the field of inorganic materials. The preparation method comprises the following steps: dissolving a sodium molybdate dehydrate solid, a manganous nitrate aqueous solution, a potassium permanganate solid and an ammonium bicarbonate solid in deionized water, and carrying out hydrothermal reaction, filtration, drying and calcination treatment to obtain a target material. The composite material has the morphology that micron-sized cubes and nano-particles coexist, the structural stability of the material is remarkably enhanced by means of synergistic lattice strain caused by two-phase compounding of Mo2C and Na2Mn8O16, and then the electrochemical performance of the composite material in the zinc ion battery is effectively improved. The preparation method is simple in process and easy to implement, and the obtained composite material shows good stability as an aqueous zinc ion battery positive electrode material and has a wide application prospect.

The invention discloses a phase separation method for preparing a metal grid transparent electrode, and the method comprises the following steps: S1, dissolving PVP (Polyvinyl Pyrrolidone) and PVB (Polyvinyl Butyral) in absolute ethyl alcohol respectively to form a PVP ethanol solution and a PVB ethanol solution; s2, mixing the PVP ethanol solution with the PVB ethanol solution to obtain a transparent mixed solution; s3, spin-coating the transparent mixed solution on the surface of a transparent substrate, and drying to form a PVP and PVB two-phase composite film; s4, immersing the composite film into deionized water, dissolving and removing the PVP film, and forming a through groove network in the PVB film; s5, depositing a metal layer in the groove network through vacuum evaporation to form a metal grid; s6, absolute ethyl alcohol is adopted for dissolving and removing the residual PVB film, and a metal grid transparent electrode is obtained; according to the method, ethyl alcohol is used as a solvent, use of a high-corrosion solvent is avoided, pollution to the environment and potential damage to a substrate and a metal layer are reduced, the micron-sized interpenetrating structure is formed by accurately controlling the mixing proportion of PVP and PVB, and preparation of a high-resolution metal grid is facilitated.

The application provides a multi-metal co-regulated layered oxide sodium ion battery positive electrode material and a preparation method and application thereof. 0.8 Ni 0.33‑x‑y‑z Cu x Zn y Fe z Mn 0.6 Mg 0.07 O2 (0<=x<0.33, 0<=y<0.33, 0<x+y+z<0.33). The positive electrode material provided by the application exhibits excellent performance, including long cycle stability and low cost price, and is a very valuable sodium ion battery positive electrode material; in addition, the positive electrode material provided by the application successfully constructs a P2 / O3 two-phase composite structure, and the electrochemical performance of the material is improved through complementation of the structure.

The invention provides a perovskite structure two-phase composite ferroelectric ceramic material with excellent dielectric energy storage and a preparation method thereof, and relates to the field of relaxor ferroelectric ceramic dielectric energy storage materials. The chemical formula of the ceramic material is (0.6-x) Bi < 0.5 > Na < 0.5 > TiO < 3-0.4 > BaTiO < 3-x > CaZrO < 3 >, x is greater than or equal to 0.1 and less than or equal to 0.2, and when x is in the interval, two perovskite phases are compounded. The relaxor ferroelectric ceramic disclosed by the invention has high breakdown field strength and high polarization intensity. Under the electric field of 115 MV / m, the energy storage density can reach 30.7 J / cm < 3 >, the energy storage efficiency can reach 85%, and the excellent effect is achieved.

The present invention provides a high-capacity layered-spinel two-phase composite doped lithium manganate and a preparation method thereof, wherein the structural formula is Li x Mn 1‑y M y O2, wherein x=0.51-0.99, y=0.01-0.25, M is one or more of Al, Cr, Co, Fe, Mg, Ti, V, Ni, Cu, Zn, Zr, Nb, Mo, W, Ca, Y, La, Ce, Ga, In; and includes C2 / m layered structure and Fd-3m spinel structure. The present invention induces the formation of a C2 / m layered structure with better performance by doping a small amount of metal elements in lithium manganate and controlling the element ratio, thereby obtaining a two-phase composite doped lithium manganate having both a C2 / m layered structure and a Fd-3m spinel structure, which significantly improves its discharge capacity, rate performance, and cycle stability, and expands the application of low-cost lithium manganate-based battery positive electrode materials.

The invention belongs to the technical field of strength tests, and particularly relates to a method for testing the bonding interface strength of a two-phase composite material. The method mainly comprises the steps that S1, a second composite material is bonded to the upper portion of a first composite material, the first composite material and the second composite material have the same width D, and the length of the first composite material is larger than the length L of the second composite material; s2, tensile loads are applied to the two ends of the first composite material till the bonding interface of the first composite material and the second composite material is in an initial damage state; s3, the elongation K1 of the first composite material and the equivalent modulus E2 of the second composite material in the length direction are determined; and S4, calculating the shear strength t of the bonding interface according to the following formula: t = K1 * E2 / (D * L / 2). According to the invention, related shear strength tests can be carried out for specific bonding thickness, and a general scheme is provided for strength evaluation of bonding interfaces of various heterogeneous materials.

The invention discloses a copper-based phosphide catalyst, an electro-deposition preparation method thereof and application of the copper-based phosphide catalyst in a nitrate reduction synthesis ammonia reaction, and belongs to the technical field of catalysis and sustainable development of energy. The catalyst is obtained by depositing a copper tin-copper phosphorus compound on a foamed nickel substrate by adopting an electro-deposition technology, the copper tin-copper phosphorus compound is formed by compounding two phases of CuSn alloy and Cu3P, and the molar ratio of CuSn to Cu3P is 1: (4.5-7.5); the copper tin-copper phosphorus compound is in a pine needle shape. According to the catalyst, through the synergistic effect of three elements of Cu, Sn and P, the nitrate adsorption / activation capacity and proton transfer kinetics are optimized, and the selectivity and reaction rate of NO3RR are remarkably improved.

The invention provides a method and system for predicting the elasticity modulus of coal gangue aggregate concrete, and belongs to the field of coal gangue aggregate concrete. The invention aims to solve the problem that the prediction precision and the universality are influenced when the elastic modulus of the existing coal gangue aggregate concrete is predicted by taking the compressive strength of the coal gangue aggregate concrete as a basic parameter. The method comprises the following steps: establishing a coal gangue aggregate concrete elastic modulus prediction model by using a Russ model based on a two-phase composite material theory, and establishing a corresponding prediction model by using the two-phase composite material theory and taking aggregate rigidity and aggregate volume content as basic parameters; wherein the rigidity of the coal gangue and the natural aggregate is simulated by adopting a Counto model. The prediction model can obtain more accurate gangue aggregate concrete elasticity modulus, the test result verifies the accuracy of the prediction model, the gangue aggregate concrete elasticity modulus prediction model based on the two-phase composite material is proposed for the first time, and the prediction model can be better applied to actual engineering.

The invention discloses a method for optimizing two-phase composite fuel liquid phase sintering process parameters. The method comprises the steps that thermodynamic parameters and dynamic parameters of all phases are obtained through calculation according to the first principle, technological parameters and characterization parameters of the sintering process are obtained through experimental data, and a Navier-Stokes equation and a phase field model of two-phase composite fuel liquid phase sintering are established; bidirectional coupling of a flow field and a phase field is achieved through a step-by-step projection method, a Navier-Stokes equation and a phase field model are solved, and microstructure features in the liquid phase sintering process are obtained; a machine learning agent model is constructed, the liquid phase sintering process microstructure features obtained through simulation serve as input, and characterization parameters obtained through sintering serve as empirical parameter items in a target optimization physical equation; and a Navier-Stokes equation and a phase field model for liquid phase sintering of the optimized high-precision two-phase composite fuel are established through iterative loop. According to the method, accurate prediction of the liquid-phase sintering morphology of the two-phase composite fuel is realized, so that a preparation process route is optimized.

The present invention provides an aluminum-magnesium-boron-lanthanum hexaboride composite ceramic material and a preparation method thereof, which belongs to the technical field of composite ceramic materials. The present invention successfully prepares an aluminum-magnesium-boron-lanthanum hexaboride composite ceramic material through high-energy ball milling, compression molding, microwave pre-sintering and sintering treatment. The addition of lanthanum hexaboride in the present invention can improve the high-temperature oxidation resistance and chemical corrosion resistance of aluminum-magnesium-boron, and at the same time can refine the grains of the composite ceramic material. The present invention utilizes boron powder and boron carbide to jointly reduce the oxides of lanthanum, aluminum and magnesium to obtain a two-phase composite ceramic material of aluminum-magnesium-boron and lanthanum hexaboride without other impurity phases. The method of the present invention requires a low synthesis temperature and a lower cost than when pure boron powder is reduced.

The invention provides a prediction method and system for an axial compressive stress-strain relation of coal gangue aggregate concrete, and belongs to the field of coal gangue aggregate concrete. The method aims at solving the problems that an existing prediction model for the axial compressive stress-strain relation of coal gangue aggregate concrete is obtained based on limited test data regression, but the physical property difference of coal gangue is large, the mechanism is complex, and the universality of the prediction model is difficult to guarantee. According to the method, an elastic modulus correction coefficient, a peak strain correction coefficient and a descending section shape parameter correction coefficient are introduced into an existing concrete axial compression stress-strain formula, and then a coal gangue aggregate concrete descending section shape parameter prediction model is deduced and established based on a two-phase composite material theory and a fault zone theory. The model is used for describing the deformability of the coal gangue aggregate concrete, and finally a prediction model of the axial compressive stress-strain relation of the coal gangue aggregate concrete is obtained; the method can effectively solve the problems of large physical property difference and complex mechanism of the coal gangue, and has universality.

This invention relates to the field of anti-corrosion coating technology, and discloses a modified epoxy anti-corrosion coating resistant to high temperature and strong acid and its construction method. The coating comprises an organophosphonic acid-functionalized phenolic epoxy resin, an organosilicon-modified epoxy resin, a linear phenolic resin curing agent, and a latent curing accelerator. The latent curing accelerator is a complex of imidazole and zinc chloride. The construction method includes mixing the two-phase composite resin matrix with the curing agent and cooling it, adding the curing accelerator for high-speed shear dispersion and vacuum degassing, and pouring it into a preheated mold for segmented heating and curing. The organosilicon system containing a silicon-oxygen backbone, combined with a high-crosslinking density phenolic network, increases the resistance to penetration by acidic media and resists high-temperature pyrolysis; the organophosphonic acid groups coordinate with the metal surface, improving interfacial adhesion; and the latent control of the complex combined with segmented curing releases shrinkage stress, preventing micro-cracks in the anti-corrosion coating.

The invention discloses a copper-doped high-entropy alloy nitride composite coating and a preparation method thereof.The coating comprises a middle transition layer and a surface working layer which are arranged on a base body, the transition layer sequentially comprises a base layer TiAlCrV alloy layer and a middle layer TiAlCrVN nitride layer from inside to outside, the surface (TiAlCrV)-Cu-N high-entropy alloy nitride layer serves as the working layer, and the surface (TiAlCrV)-Cu-N high-entropy alloy nitride layer serves as the working layer. Wherein the (TiAlCrV)-Cu-N layer is formed by compounding two phases of a TiAlCrVN nitride solid solution with a face-centered cubic structure and metal copper with the face-centered cubic structure. According to preparation of the working layer coating, a TiAlCrV alloy target and a Cu elementary substance target are evaporated at the same time in Ar and N2 atmospheres through the arc ion plating technology, and the copper-doped high-entropy alloy nitride (TiAlCrV)-Cu-N composite coating with different contents is prepared. The (TiAlCrV)-Cu-N composite coating prepared by the preparation method disclosed by the invention is strong in binding force with a matrix, high in hardness, good in toughness, small in friction coefficient and excellent in wear resistance, and the service life of a workpiece can be remarkably prolonged.