27 results about "Matrix strength" patented technology

The invention discloses a preparation process of a dual-material tappet with both wear resistance and toughness, and relates to the technical field of engine tappet manufacturing, the preparation process comprises the steps of matrix pretreatment, gradient heating, infiltration compounding, diffusion heat preservation, subsection cooling and finish machining, and a wear-resistant alloy material comprises the following chemical components in percentage by weight: 3.2-3.6% of C, 0.4-0.6% of Ni, 2.4-2.5% of Si, 0.9-1.3% of Cr, 0.6-0.9% of Mn and the balance of Fe and inevitable impurities. Mo is equal to 0.4%-0.65%, and Slt is equal to 0.1%, Plt; 0.1%, with the balance being Fe and inevitable impurities. Compared with the prior art, the method has the advantages that the performance can be flexibly matched according to different engine requirements; the comprehensive performance of the working face is remarkably improved by adopting an infiltration composite process; the strength and the toughness of the matrix are improved; the double-metal bonding strength is consistent; the cost of the infiltration composite process is lower than that of brazing; the matrix in the semi-molten state and the wear-resistant material form metallurgical bonding, and the bonding strength is higher; the combined steel and the gradient cooling process jointly improve the impact resistance.

The invention relates to the technical field of concrete electric pole manufacturing, and discloses a method and system for manufacturing a centrifugal electric pole based on high-performance steel fiber reinforced anti-crack concrete. The method comprises the following steps: collecting raw material performance index data including concrete rheological characteristics, steel fiber distribution and matrix strength data; an electric pole forming multi-scale coupling model is constructed through a material simulation platform; identifying fiber orientation characteristics according to steel fiber distribution data, comparing the fiber orientation characteristics with a fiber distribution-doping demand mapping table, judging whether to adjust a fiber doping strategy or not, and starting a manufacturing parameter decision process if the fiber doping strategy needs to be adjusted; stirring, centrifugal forming and maintenance parameters are extracted from preset rules in combination with performance index data, and details such as the fiber feeding time sequence, the rotating speed and the temperature and humidity gradient are determined; the model is used for simulating the whole manufacturing process, related indexes are output to evaluate the proportion, parameters and quality stability, an instruction optimization process is generated, and the manufacturing scientificity is improved.

The application discloses a design method of a core-shell type repairing agent carrier for concrete crack self-repairing. The method belongs to the technical field of building materials and is based on the strength grade of applied concrete, the crack width, the crack area and the repairing component parameters, and a core-shell carrier with the inner and outer radii, the elastic modulus and the particle strength matched with the matrix concrete is designed based on the loading capacity and the mechanical response principle. The specific design steps are as follows: the inner radius of the core-shell structure carrier is determined based on the loading capacity design; the suitable outer radius of the carrier is determined according to the regional stress field distribution characteristics; the suitable elastic modulus of the carrier is determined according to the material parameters of the matrix concrete; and the particle strength design value of the core-shell carrier is determined according to the above parameters. The carrier designed by the method has reasonable loading capacity, is matched with the parameters of the concrete matrix and has no negative influence on the matrix strength.

A kind of high thermal strength steel, the alloy composition and its mass percentage content are as follows: C 0.85~0.95%, Si 0.8~1.2%, Mn 12.5~15.5%, Cr 4.5~5.5%, Mo 1.7~2.3%, W 1.2~1.8%, V 0.8~1.2%, N 0.08~0.12%, P≤0.010%, S≤0.008%, the balance is Fe and inevitable impurities.The application adds 0.08~0.12% nitrogen in the traditional Fe-Mn-Cr-C austenitic steel system, ensures that the matrix of steel maintains single-phase austenite structure in the range of 20~800 DEG C, guarantees the consistency of material performance;Meanwhile, carbide forming elements such as W, Mo, V are added, which improves the matrix strength.

The present application relates to the technical field of titanium alloy material engineering, and particularly relates to a yield strength calculation method based on the microstructure of titanium alloy with basket weave structure. The yield strength of titanium alloy with basket weave structure is divided into matrix strength, solid solution strengthening effect, grain boundary strengthening effect, dislocation strengthening effect and alpha phase precipitation strengthening effect. The present application innovatively designs a more accurate alpha phase precipitation strengthening model, and designs a circumscribed rectangle length-width statistical method and a phase microstructure weighting algorithm based on area for auxiliary statistics. The traditional method converts lamellar alpha phase into an equal-area circle to consider the strengthening effect. The present application fits the lamellar alpha phase into a long-axis rectangular part and a short-axis two-semicircle part. Compared with the traditional method, the yield strength calculation method based on the microstructure of titanium alloy with basket weave structure in the present application is more close to the actual situation, the statistical method is more accurate and reliable, the result has a smaller error with the actual result, and can be used in the engineering technical fields of titanium alloy microstructure design and performance control.

The invention relates to the technical field of new materials, in particular to an admixture as well as a preparation method and application thereof. The admixture is prepared from the following components in parts by mass: 1.0 to 5.0 parts of a complexing agent, 1.5 to 8.0 parts of a calcium ion compensating agent, 1.0 to 8.0 parts of a crystallization accelerant, 3.0 to 10.0 parts of a slow release agent, 5.0 to 15.0 parts of an active mineral admixture, 15.0 to 28.5 parts of an expanding agent, 20.0 to 40.0 parts of Portland cement and 10.0 to 20.0 parts of quartz sand. The admixture can realize self-repairing of cement-based material cracks in humid and water seepage environments, has the functions of improving matrix strength and waterproof performance, reducing hydration heat, delaying temperature peak appearance and the like, and is wide in application range.

The invention discloses a recycled PET aggregate high-ductility cement-based composite material and a preparation method thereof, and belongs to the technical field of concrete. Natural fine aggregate in the cement-based composite material is replaced by recycled PET aggregate with the volume replacement rate of 100%, the water-binder ratio of water to a binding material of the cement-based composite material is 0.21-0.39, and meanwhile, the particle size of the PET aggregate is 72.5-267.0 microns. Experiments prove that more crack initiation points can be formed in an SHCC matrix by adopting PET aggregate to completely replace quartz sand, so that the ultimate tensile strain and crack control capability of the SHCC are remarkably improved, and the performance optimization of the SHCC on the synergistic effect of the matrix strength and the PET particle size is explored. A new thought is provided for performance optimization of SHCC, development of green and environment-friendly concrete materials is facilitated, and reference value is provided for special engineering application.

A rubber composite material, raw materials of the material include the following components in parts by weight: hydrogenated nitrile rubber 50-80 parts; nitrile rubber 20-50 parts; spherical filler 30-60 parts; lamellar filler 0.5-5 parts; modifier 1-5 parts; plasticizer 1-10 parts; damping molecule 5-30 parts; antioxidant 2-5 parts; zinc oxide 3-5 parts; stearic acid 1-3 parts; vulcanization accelerator 1-5 parts; sulfur 1-5 parts; peroxide vulcanizing agent 0.5-2 parts. The rubber composite material provided by the application ensures the matrix strength and oil resistance by selecting hydrogenated nitrile rubber with high hydrogenation degree and high acrylonitrile nitrile rubber; the load bearing strength of the rubber composite material is enhanced by introducing the combined system of spherical filler and lamellar filler in the blending system; the damping molecule with polymerization type or high molecular weight can form chemical crosslinking under the action of the vulcanization system between the damping molecule and the matrix, the damping effect of the damping molecule is played, meanwhile, the damping molecule has good anti-high-temperature insulating oil extraction effect, and the service life of the rubber composite material is prolonged.

The invention belongs to the field of metal material preparation, and discloses a Cu-Zn-Ti-Si alloy synergistically strengthened by a primary phase and a hypoeutectic structure and a preparation method for regulating components and cooling speed of the Cu-Zn-Ti-Si alloy. Comprising the following steps: (1) burdening; (2) in an argon atmosphere, heating pure copper until the pure copper is molten, and sequentially adding the copper-titanium intermediate alloy and the copper-silicon intermediate alloy; (3) after the intermediate alloy is completely melted, pressing the pure zinc block wrapped by the copper foil into the melt; (4) carrying out electromagnetic stirring, then raising the temperature to a target temperature, and carrying out flaming degassing treatment; and (5) after the melt is stable, pouring the melt into a preheated copper mold, monitoring a cooling curve in real time by using a built-in thermocouple, and accurately controlling the cooling rate by adjusting the preheating temperature and the pouring speed of the mold so as to obtain a target microstructure. The invention provides an effective technical approach for solving the problems that the matrix strength is insufficient and the hard phase is easy to fall off in the traditional single strengthening mode, and has important significance on the development of novel wear-resistant brass alloy.

A super-high-performance ice-based material and its preparation method belong to the technical field of ice-based materials, including seawater, lightweight aggregate, water-soluble thickener, main material and auxiliary material. The main material and auxiliary material are stirred in a mixer, and after adding the thickening solution formed by seawater and water-soluble thickener, it is stirred again with the lightweight aggregate soaked in seawater to obtain a mixture, which is then molded and demolded after cooling to obtain a super-high-performance ice-based material. By using reinforcing fibers, viscosity adjustment and cementitious material design, the material density is effectively reduced, and the uniformity of the ice-based composite material is improved; by synergistically improving the matrix strength and the strength of the additive, the strength and toughness of the composite material are effectively improved; through the bonding effect between steel fibers and the high-strength matrix, the tensile strength of the ice-based composite material is effectively improved, the energy consumption of impact damage is increased, and thus the anti-explosion performance is enhanced.

The application provides a spiral tensile fiber concrete preparation method with high anti-explosion performance, belongs to the field of fiber reinforced concrete, and comprises the following steps: according to the fiber type and mechanical performance parameters, the diameter ratio and wrapping angle of the spiral tensile fiber are predicted based on deep learning, and the spiral tensile fiber is prepared; the spiral tensile fiber is embedded into concrete with different matrix strengths, the negative Poisson's ratio of the spiral tensile fiber is determined after curing, and the concrete matrix strength grade corresponding to the maximum negative Poisson's ratio is recorded; under the concrete matrix strength grade corresponding to the maximum negative Poisson's ratio, a plurality of groups of mixing ratios are generated, the mechanical performance prediction value is obtained based on deep learning according to the spiral tensile fiber characteristic parameters and the mixing ratios, the fitness of the mechanical performance prediction value and the target value is calculated, the matrix mixing ratio is searched based on a genetic algorithm, and the matrix mixing ratio is verified; and the concrete is prepared according to the matrix mixing ratio and the spiral tensile fiber; the preparation system is also provided; and the anti-explosion performance of the concrete is improved.

The application discloses a kind of heat treatment methods of roll for wire bar roughing stand, the diameter of the roll is 300-1000mm, heat treatment method includes the following steps: S1, normalizing: the roll is heated to 820-860 ℃, and the temperature of the whole roll section is uniform, then the roll is cooled to room temperature in air;S2, tempering: the roll after normalizing treatment is heated to 680-720 ℃ again, and then kept for 10-15 hours;S3, cooling: the roll after keeping is cooled using cooling device, first spray+water spray cooling t1 time, then spray cooling t2 time again, improve the quenching cooling intensity of roll, obtain tempering sorbite structure;The application improves the quenching cooling intensity of roll, improves the matrix strength of roll.

The invention relates to the technical field of metallurgy, in particular to a low-cost semi-annealed low-carbon steel thick coating zinc-aluminum-magnesium alloy and a preparation method thereof.The low-cost semi-annealed low-carbon steel thick coating zinc-aluminum-magnesium alloy comprises a base material and a coating formed on the base material, and the base material comprises, by weight, 0.01%-0.08% of C, smaller than or equal to 0.030% of Si, 0.15%-0.26% of Mn, 0.015%-0.026% of P, smaller than or equal to 0.010% of S, 0.02%-0.06% of Als, smaller than or equal to 0.3000% of Ti and the balance Fe and inevitable impurities; the plating solution for preparing the plating layer comprises the following chemical components in percentage by weight: 9-11% of Al, 2.8-3.1% of Mg, less than or equal to 0.1% of rare earth elements, 0.1-0.2% of Si and the balance of Zn and inevitable impurities; according to the method, the residual stress of the strip steel is regulated and controlled through a low-carbon steel low-temperature semi-annealing process, the matrix strength is improved through a work hardening and grain distortion structure genetic mechanism, and meanwhile collaborative optimization of the corrosion resistance of the coating and the mechanical performance of the matrix is achieved by combining a zinc-aluminum-magnesium coating multi-element diffusion dynamic control technology.

The invention discloses a production process for composite chemical plating on the surface of a carbon fiber roller. The production process comprises the steps of plasma etching activation, catalytic activation, low-temperature composite chemical plating and aftertreatment. A rough surface and an oxygen-containing functional group are constructed through argon / oxygen mixed plasma etching, ultrasonic-assisted palladium-tin catalysis is used for enhancing a combined anchor point, a Ni-P-SiC composite coating is deposited at the temperature of 65-85 DEG C in combination with dynamic rotation and pulse stirring, and machining is completed through nitrogen protection heat treatment and polishing. The process solves the problems of matrix thermal damage, hydrogen embrittlement risk, coating spalling and environmental protection of a traditional process, the binding force of a plating layer is improved to be larger than or equal to 25 MPa, the porosity is smaller than or equal to 0.5%, the matrix strength retention rate is larger than 95%, the wastewater treatment cost is reduced by 60%, and the process is suitable for surface treatment of the high-performance carbon fiber roller.

The invention relates to Nb-V-Ti microalloyed low-temperature-resistant high-strength high-toughness wind power pulley shaft steel and a manufacturing method thereof, and belongs to the technical field of alloy steel, the steel comprises the following chemical components in percentage by mass: 0.37-0.44% of C, 0.5-0.8% of Mn, 0.17-0.37% of Si, 0.04-0.08% of Ti, 0.06-0.14% of V, less than or equal to 0.015% of S, less than or equal to 0.015% of P, less than or equal to 0.005% of N, 0.10-0.25% of Cu, 0.6-0.9% of Cr, 0.15-0.25% of Mo, 1.25-1.65% of Ni, 0.035-0.055% of Nb and the balance of Fe and inevitable impurities, the steel is sequentially subjected to converter smelting, external refining, casting blank heating, forging and heat treatment The Nb-V-Ti composite microalloying design is adopted, the synergistic effect is achieved from the three aspects of grain boundary pinning, dynamic precipitation and solid solution strengthening, the limitation of the single element effect is broken through, grains are refined, carbide distribution is uniform, the ductile-brittle transition temperature is reduced, and the matrix strength is improved; according to the produced 40CrNiMo steel, the yield strength is larger than or equal to 905 MPa, the tensile strength is larger than or equal to 1055 MPa, the elongation is larger than or equal to 16.5%, the percentage reduction of area is larger than or equal to 42%, the impact energy at the temperature of minus 40 DEG C is larger than or equal to 48 J, and the 40CrNiMo steel has high strength and good low-temperature toughness.

According to the high-foaming low-water-absorption hard melamine foam and the preparation method thereof, in the polymerization stage, high-molecular-weight flexible groups are introduced, the solid content is increased while the distance between rigid groups of a prepolymer is increased, and therefore the toughness of the prepolymer and the strength of a matrix are improved; the melamine resin prepolymer is vacuumized and dried through the vacuum drying box, the solid content of the prepolymer is increased, and the strength of the prepolymer is improved; in the foaming stage, foaming of a foam gradient method is achieved by preparing a composite foaming agent and a composite curing agent and compounding foaming agents with multiple boiling points, meanwhile, curing agents with multiple curing rates are compounded, foam curing is conducted according to the foaming processes of different stages, the foaming performance of foaming liquid is optimized, and the stability of the foaming processes is guaranteed; the product percent of pass is improved; by adding reinforcing fillers such as carbon fibers and carbon nanotubes, the strength of the foaming liquid is improved, and the problem of foam collapse caused by insufficient foam hole wall strength is prevented.

The invention provides an aluminum-silicon alloy additive manufacturing method based on in-situ reaction modification, which comprises the following steps: selecting aluminum-silicon alloy powder with the particle size range of 15-53 microns, carrying out vacuum heat preservation for 2-6 hours at the temperature of 80-150 DEG C, and drying; the aluminum-silicon alloy powder is prepared from the following elements in percentage by mass: 8 to 12 percent of Si, 0 to 1 percent of Mg, 0.01 to 1 percent of Sr and the balance of Al and inevitable impurity elements; and finally, forming and preparing the aluminum-silicon alloy by adopting a selective laser melting process. Silicon phase coarsening is inhibited through Sr metamorphism, Sr and Al / Si in a molten pool are promoted to be subjected to an in-situ reaction through the ultrahigh cooling rate of SLM, a fine nanoscale metastable phase is generated, the elasticity modulus of the fine nanoscale metastable phase is equivalent to that of an aluminum matrix, the fine nanoscale metastable phase can serve as strengthening particles to improve the matrix strength, and stress concentration can be relieved by coordinating local plastic deformation.

The present invention relates to the field of metal material science and engineering technology, and in particular to a niobium-containing thick-gauge weathering steel and a rolling method thereof. The weathering steel has a C content of 0.06%-0.10%, a Si content of 0.15%-0.35%, a Mn content of 0.80%-1.20%, a P content of no more than 0.015%, a S content of no more than 0.005%, a Nb content of 0.025%-0.045%, a V content of 0.05%-0.10%, and a Zr content of 0.02%. %-0.05%, Cu content is 0.40%-0.60%, Cr content is 0.60%-1.00%, Ni content is 0.30%-0.50%, Mo content is 0.10%-0.30%, and the rest is Fe and unavoidable impurities. The high-strength oxidation-resistant weathering steel of the present invention controls the content of each alloy element through chemical composition design, especially adding rare earth elements RE and optimizing the ratio of elements such as Nb, V, and Zr, which significantly improves the matrix strength of the steel and promotes the optimization of the microstructure.

The invention belongs to the technical field of high-strength hot continuous rolling steel, and particularly relates to chromium-molybdenum-vanadium-titanium microalloyed wear-resistant steel and a production method thereof. In order to further improve the strength, hardness and wear resistance of the martensitic wear-resistant steel, the invention provides the martensitic wear-resistant steel which comprises the following chemical components in percentage by mass: 0.3 to 0.4 percent of C, 0.1 to 0.3 percent of Si, 1.5 to 2.0 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.01 to 0.05 percent of Als, 0.3 to 0.4 percent of Cr, 0.15 to 0.30 percent of Mo, 0.05 to 0.10 percent of V, 0.4 to 0.8 percent of Ti, 0.01 to 0.012 percent of N and the balance of Fe and inevitable impurities. According to the steel disclosed by the invention, micron-sized Ti (CN) particles and a nano-sized Mo-Ti-V carbonitride precipitated phase are introduced, so that the matrix strength is improved, and the wear resistance is further improved.

This invention relates to a ceramic heating plate, its preparation method, and its application. The preparation method of the ceramic heating plate includes the following steps: (1) molding the raw material powder, and the resulting green body undergoes debinding treatment and first machining to obtain a blank to be welded; (2) welding the sleeve tube to the bottom cover plate, and assembling the resulting sleeve body with the blank to be welded obtained in step (1). During the assembly, heating wires and electrode mesh are placed according to the internal structure of the ceramic heating plate. The assembled sleeve body is then welded to the top cover plate to obtain the sleeve structure; (3) the sleeve structure obtained in step (2) is subjected to degassing treatment, hot isostatic pressing sintering, and post-treatment to obtain the ceramic heating plate. This invention uses molding, sleeve welding, and hot isostatic pressing sintering steps to make the ceramic heating plate have the characteristics of high density, high matrix strength, and tight bonding between the welded blank and the heating wire.

The invention belongs to the technical field of metallurgy, and relates to copper-niobium composite reinforced high-temperature carburizing gear steel and a production method thereof. The alloy comprises the following components in percentage by weight: 0.15 to 0.19 percent of C, less than or equal to 0.20 percent of Si, 0.70 to 0.95 percent of Mn, 1.50 to 1.90 percent of Cr, 0.045 to 0.055 percent of Nb, less than or equal to 0.10 percent of Mo, 0.04 to 0.060 percent of Al, 0.10 to 0.20 percent of Cu, 0.016 to 0.020 percent of N, less than or equal to 0.015 percent of P, less than or equal to 0.020 percent of S and less than or equal to 8ppm of O. And the balance of Fe and inevitable impurities. Performance breakthrough is achieved through the following technical paths that Cu is subjected to solid solution in austenite, the matrix strength is improved, and the uniformity of a carburized layer is promoted; nb and N form a nanoscale Nb (C, N) precipitated phase, Al accurately controls the precipitation time of AlN, internal cracks of a continuous casting blank are avoided, and original austenite grains are refined.

The invention provides a preparation method of spiral auxetic fiber concrete with high anti-knock performance, and belongs to the field of fiber reinforced concrete.The preparation method comprises the steps that according to fiber types and mechanical property parameters, the diameter ratio and the wrapping angle of spiral auxetic fibers are predicted based on deep learning, and the spiral auxetic fibers are prepared; the spiral auxetic fibers are embedded into concrete with different matrix strengths, negative Poisson's ratio values of the spiral auxetic fibers are measured after maintenance, and the concrete matrix strength grade corresponding to the maximum negative Poisson's ratio value is recorded; under the concrete matrix strength grade corresponding to the maximum negative Poisson's ratio value, generating multiple groups of mix proportions, obtaining a mechanical property predicted value based on deep learning according to the spiral auxetic fiber characteristic parameters and the mix proportions, calculating the fitness of the mechanical property predicted value and a target value, searching a matrix mix proportion based on a genetic algorithm, and verifying the matrix mix proportion; concrete is prepared according to the matrix mix proportion and the spiral auxetic fibers; the invention further provides a preparation system. The anti-explosion performance of the concrete is improved.

The invention discloses a preparation method of a samarium oxide modified aluminum phosphate-based high-temperature adhesive for mullite connection, and belongs to the technical field of adhesive material preparation. The invention aims to solve the problem that the bonding strength of a traditional aluminum phosphate adhesive and mullite ceramic is insufficient. The preparation method mainly comprises the following steps: mixing boron carbide and silicon powder to prepare an inorganic filler; samarium oxide, aluminum hydroxide and dilute phosphoric acid are used as raw materials, a samarium-aluminum-phosphorus macromolecular phosphate gum base solution is synthesized through a hydrothermal reaction, and the performance is optimized by accurately regulating and controlling the element proportion of samarium, aluminum and phosphorus; and finally, fully mixing the gum base solution with the inorganic filler to obtain the high-temperature adhesive. The key improvement of the invention lies in that through samarium oxide modification, a stable and compact complex phase structure composed of samarium phosphate (SmPO4) and aluminum phosphate is generated in a system, and the structure enhances the matrix strength. After heat treatment at the temperature of 1300 DEG C, the bonding strength to mullite ceramics is not lower than 20 MPa, and excellent high-temperature resistance and bonding performance are shown.

The application belongs to the technical field of hot melt adhesives, and discloses a hybrid coordination driven hot melt adhesive with high flowability and matrix strength and a preparation method and application of the hot melt adhesive. The hot melt adhesive comprises the following components in parts by mass: hybrid coordination hot melt acrylamide grafted starch 40-80 parts, ethylene-vinyl acetate copolymer 10-30 parts, tackifier 10-30 parts, and antioxidant 0.2-0.4 parts. The hot melt adhesive prepared by using the modified aminated starch is rich in amino groups, and forms strong hydrogen bonds and coordination with the interface, has excellent bonding performance, has good bonding effect on paper and non-woven fabric, has high metal bonding strength, the copper sheet lap bonding strength reaches 6.1 MPa, the aluminum strip peeling strength reaches 1227 N / m, and can be applied to the fields of vehicle interiors, furniture, food, packaging, papermaking, sanitary products and the like.

The invention discloses a high-strength and high-toughness pearlite steel wire with a surface-induced multi-scale gradient heterogeneous structure as well as a preparation method and application of the high-strength and high-toughness pearlite steel wire, and belongs to the technical field of pearlite material processing. The invention discloses a high-strength and high-toughness pearlite steel wire with a surface-induced multi-scale gradient heterogeneous structure. The pearlite steel wire has a granular-fibrous-multi-layer rock gradient structure from the edge part to the core part; and the surface of the steel wire is provided with a metal glass-nanocrystalline composite coating which is metallurgically bonded with a matrix and has the thickness of 3-8 microns. The matrix strength is improved through solid solution strengthening; the amorphous / nanocrystalline structure plays a key role in relieving stress concentration and promoting coordinated deformation; and the dispersively distributed particles and fibrous sheet layers further provide the work hardening capability. The Vickers hardness of the aluminum alloy reaches up to 500-520 HV < 0.1 >, the tensile strength of the aluminum alloy is 3060-3080 MPa, and the ductility of the aluminum alloy is 15.0-18.0%.

The invention discloses a high-carbon alloy steel surface roughening agent and a roughening method, and belongs to the technical field of metal surface machining. The coarsening agent comprises the following components in percentage by volume: 15%-35% of hydrochloric acid, 10%-20% of sulfuric acid, 0.1%-1.0% of a corrosion inhibitor, 0.05%-0.5% of a wetting agent and the balance of deionized water. According to the method, the to-be-coarsened surface of the high-carbon alloy steel is processed through the synergistic effect of the two inorganic acids, namely the hydrochloric acid and the sulfuric acid, a passive film on the surface of the high-carbon alloy steel is removed through the hydrochloric acid, and the hydrochloric acid is combined with high oxidizability generated by the sulfuric acid, so that uniform coarsening of the surface of the high-carbon alloy steel is achieved; meanwhile, hydrogen embrittlement and excessive corrosion are inhibited through the corrosion inhibitor, the matrix strength of the high-carbon alloy is kept, and roughening machining of the surface of the high-carbon alloy steel is achieved; the heat preservation short-time soaking technology is adopted for machining, the environment-friendly requirement in the roughening process is met, uniform roughening of the surface of the high-carbon alloy steel and the matrix strength of the high-carbon alloy steel are guaranteed, and the roughening machining cost is reduced.

The invention discloses a toughening particle for interlayer toughening of a composite material and a synthesis method of the toughening particle. The toughening particles are modified thermoplastic resin nylon particles with core-shell structures; in the core-shell structure, the core is thermoplastic resin nylon 6 particles, the shell is a coating formed by in-situ polymerization of polydopamine on the surfaces of the nylon particles, and the coating is formed by interface interaction with groups on the surfaces of the nylon particles. The preparation process is simple and convenient, the obtained toughening particles achieve synergistic improvement of interlayer toughness and matrix strength of a composite material, improve the dispersity of nylon particles in resin, can adapt to various resin matrixes, and solve the problems that a traditional nylon toughening agent is attenuated in strength, prone to agglomeration and narrow in adaptability after toughening, and the toughening effect is good. The low-cost and high-quality production of the composite material is facilitated.