572 results about "Toughening" patented technology

The invention belongs to the technical field of polymer insulating materials, and particularly discloses a high-toughness and high-insulating-strength epoxy insulating material and a preparation method thereof. Single-end amine-terminated straight-chain alkyl groups with different chain lengths in a specific molar ratio are grafted to fluorine-containing epoxy resin to construct a side chain structure, and then a step curing process is adopted to form a three-dimensional cross-linked network with a curing agent under the action of an accelerant. The fracture toughness is remarkably improved by utilizing an epoxy body chain extension effect in a side chain grafting process and a uniform microphase separation structure formed by self-assembly of a long alkyl side chain in a curing process; meanwhile, through the synergistic effect of steric hindrance of a short alkyl side chain and a fluorine atom charge trap, delocalized electron transmission of a benzene ring conjugated structure is inhibited, and the insulating property is synchronously enhanced. Compared with a traditional toughening technology, insulation deterioration caused by toughening modification is effectively avoided, and an epoxy resin material with mechanical reliability and insulation stability is provided for high-voltage electrical equipment.

The invention provides a strengthening and toughening control method for a high-strength titanium alloy welded joint, and relates to the technical field of metal material welding, the strengthening and toughening control method comprises the following steps: S1, during welding, multi-layer and multi-channel gradient heat input is adopted, the heat input quantity of front-channel welding is Q1, the heat input quantity of rear-channel welding is Q2, and Q1 is greater than Q2; s2, after welding, cooling a welding area by stages, adopting inert gas forced convection cooling in a primary cooling stage, adopting water mist pulse cooling when the welding area is cooled to a medium temperature stage, and adopting natural air cooling when the welding area is cooled to a low temperature stage; through the synergistic effect of multi-layer multi-channel gradient heat input and staged cooling, the microstructure and performance of the high-strength titanium alloy welded joint can be effectively regulated and controlled, the structure gradient regulation and control of the titanium alloy welded joint are achieved, the tensile strength, the ductility, the fracture toughness and the creep property of the welded joint are improved, meanwhile, the process can be simplified, and deformation is reduced.

The invention relates to the field of additive manufacturing, and discloses a dynamic phase change control additive ultrahigh-strength steel strengthening and toughening process which comprises the following steps: S1, constructing a phase change structure design target which comprises retained austenite distribution, a structure space structure and mechanical property requirements; s2, based on the phase change structure design target, establishing a free energy model taking a phase field variable as a core for representing a phase change driving behavior between austenite and martensite; s3, on the basis of the free energy model, constructing a multi-field partial differential control model coupling phase field evolution, element diffusion and heat conduction; and S4, in combination with the multi-field partial differential control model, determining an interface adsorption parameter, a diffusion coefficient and a thermophysical parameter based on experimental characterization data. According to the method, path parameters are optimized through a multi-field partial differential control model and tissue deviation feedback, and accurate control of the phase change tissue and dynamic closed-loop adjustment of the machining process are achieved.

The invention discloses multi-scale toughened concrete and a preparation method thereof, and belongs to the technical field of high leakage, and the multi-scale toughened concrete comprises aluminoferrite cement, a low-shrinkage auxiliary cementing material, a water reducing agent, multi-scale composite fibers, a shrinkage compensation agent, fine aggregate, coarse aggregate and water. A traditional toughening mode is broken through, a physical-chemical composite connection interface is established through a magnetron sputtering metal gradient coating of crude fibers and a laser-induced dendritic crystal structure, a strain hysteresis effect is triggered under an impact load, impact energy is converted into interface phase change energy, and a high-efficiency energy dissipation channel is formed; an amino functional group and free radical cross-linked network is introduced into the fine fibers, and the fibers are endowed with microcosmic dynamic enhancement capability in combination with directional arrangement of the carbon nanotubes, so that the concrete forms cooperative interaction between macroscopic crack bridging and microcosmic crack inhibition, the crack resistance under complex stress is remarkably improved, and microcrack propagation is effectively inhibited.

Designed in the present disclosure are a high-strength aluminum-erbium alloy for additive manufacturing and a preparation method therefor. The alloy comprises: 4-20 wt% of erbium (Er); 2-10 wt% of magnesium (Mg); less than or equal to 1 wt% of manganese (Mn); optionally, 0-1 wt% of scandium (Sc); and optionally, 0-1 wt% of zirconium (Zr). In the present disclosure, in order to improve both the formability and the mechanical properties of the alloy, based on alloy composition design assisted by a phase diagram calculation method, an Al-Er eutectic system is selected to reduce a solidification interval and form a fine grain phase, and therefore the technical effects of structure refinement, no thermal cracks and good printing performance are achieved; and in particular, a continuous cellular FCC configuration Al3Er eutectic network structure with a plastic deformation capability is introduced, with a size in the order of hundreds of nanometers, and therefore both strengthening and toughening effects are achieved. The aluminum-erbium alloy has both good printing formability and comprehensive mechanical properties, and the preparation method therefor is proven, has low costs and high efficiency, and can be used for large-scale industrial production.

The invention discloses a silicon nitride ceramic-based composite material and a preparation method thereof, and relates to the technical field of silicon nitride ceramics. The silicon nitride ceramic-based composite material is prepared from silicon dioxide coated modified boron nitride and resin composite phase change microcapsules, Si3N4-C coated Al2O3 core-shell fiber aerogel, nano yttrium oxide and polyvinyl butyral, the silicon dioxide coated modified boron nitride and resin composite phase change microcapsules are stably attached to the surface of the Si3N4-C coated Al2O3 core-shell fiber aerogel in a chemical bonding and mechanical interlocking mode, the interface bonding strength is enhanced, the risk of phase separation is reduced, the combination effect of the silicon dioxide coated modified boron nitride and resin composite phase change microcapsules and the Si3N4-C coated Al2O3 core-shell fiber aerogel is better exerted, and the composite phase change effect of the silicon dioxide coated modified boron nitride and resin composite phase change microcapsules is improved. According to the present invention, the fracture toughness can be improved through fiber toughening, aerogel pore and microcapsule stress dispersion, the high temperature resistance can be improved through the low thermal conductivity of the aerogel and the heat absorption effect of the microcapsule, the mechanical property of the silicon nitride can be significantly improved through multiple ways and multiple modes, and the high temperature resistance can be effectively enhanced.

The present invention relates to the technical field of concrete. Disclosed is a toughening design method for fiber-reinforced concrete. The method of the present invention changes the passive control characteristics of fibers on a concrete crack propagation process in conventional fiber-reinforced concrete. Starting from the origin of composite material design, firstly, an ultrahigh-ductility composite cementitious matrix is designed; and secondly, an aggregate is incorporated. On the basis of a specific combination of matrix and aggregate parameters, a composite material develops meso-scale multiple cracking and strain-hardening behaviors between aggregate particles during external loading. The fiber-reinforced concrete prepared by this method actively disperses brittle damage and failure within the material, and avoids unstable crack propagation caused by weak interfacial bonding between the aggregate and the matrix. Compared to conventional fiber-reinforced concrete design methods, the present invention more accurately establishes relationships between material compositions, microstructures and macroscopic mechanical response, and more efficiently enhances the toughness of the material.

The invention discloses an epoxy resin tack coat oil material suitable for a steel bridge deck, which constructs a multi-scale toughening composite system through the synergistic effect of an epoxy-terminated polyurethane elastomer toughening agent (molecular-scale chemical grafting) and a nano-scale elastomer filler (nano dispersion toughening), and solves the problem of rigidity-flexibility imbalance of the traditional epoxy tack coat oil. The material has the advantages of fast curing (surface drying at 25 DEG C is less than or equal to 4 hours), high toughness (the elongation at break is greater than or equal to 250%) and excellent weather resistance (the performance retention rate is greater than or equal to 85% after ultraviolet aging for 500 hours), and is suitable for interlayer interface bonding of steel bridge deck pit slot and crack repair. According to the preparation method, uniform dispersion and interface chemical bonding of the nanofiller are achieved through a segmented stirring process, the comprehensive performance of the material is remarkably improved, and the important engineering application value is achieved.

The invention relates to a high-purity corundum brick with high thermal shock resistance and a preparation method thereof, and belongs to the technical field of refractory materials. The high-purity corundum brick with high thermal shock resistance is prepared from the following raw materials in parts by mass: 55 to 65 parts of tabular corundum particles, 20 to 25 parts of tabular corundum fine powder, 8 to 12 parts of modified fused zirconia corundum particles, 5 to 8 parts of nano aluminum oxide powder, 2 to 3 parts of rho-aluminum oxide powder, 0.3 to 1 part of toughening agent and 0.3 to 1.5 parts of binding agent. The toughening agent increases the fracture toughness of the high-thermal-shock-resistance high-purity corundum brick through a plurality of strengthening mechanisms such as crack deflection, crack branching and microcracks, so that the high-thermal-shock-resistance high-purity corundum brick has high thermal shock resistance and mechanical properties. Meanwhile, the fused zirconia corundum has a short fiber structure through modification, and fibers can hinder linear propagation of main cracks, force the cracks to deflect and form crack branches, so that the thermal shock resistance and mechanical properties of the high-purity corundum brick with high thermal shock resistance are further enhanced.

The invention belongs to the technical field of wall joint filling, and relates to a wall cracking joint filling agent and a wall joint filling process, the wall cracking joint filling agent comprises a cement-based cementing material, fine aggregate, modified toughening fiber, modified nano zinc oxide, a dispersing agent, a defoaming agent, a water-retaining agent and a mildew preventive; the modified toughened fiber is obtained by sequentially carrying out alkali etching, dopamine coating and intercalated kaolin loading on polyacrylonitrile fiber; the modified nano-zinc oxide is obtained by modifying nano-zinc oxide through a silane coupling agent and coating and modifying the nano-zinc oxide through chitosan. According to the wall crack repairing agent provided by the invention, the modified toughening fibers and the modified nano zinc oxide which are subjected to surface functionalization treatment are introduced, so that the crack resistance and toughness of a cement-based crack repairing material can be remarkably improved, the occurrence probability of secondary cracking after repairing can be remarkably reduced, meanwhile, lasting and effective mildew-proof and antibacterial capabilities can be provided, microbial erosion can be inhibited, and the service life of the wall crack repairing agent is prolonged. And good construction operability and basic mechanical properties of the material are maintained.

The invention provides low-temperature-resistant high-modulus rubber asphalt and a preparation method thereof, and relates to the technical field of rubber asphalt, and preparation raw materials of the low-temperature-resistant high-modulus rubber asphalt comprise the following components: matrix asphalt, rubber powder, a desulfurizer, a free radical type thermal initiation crosslinking agent, a reinforcing agent, a coupling agent, a flexibilizer, a viscosity reducer and an auxiliary agent. According to the low-temperature-resistant high-modulus rubber asphalt provided by the invention, the ductility at 5 DEG C is greater than 30cm, the maximum breaking flexural-tensile strain of a mixture at-10 DEG C is greater than 4000 mu epsilon, the dynamic modulus of the mixture at 15 DEG C is greater than 15000MPa, and the high-temperature performance and modulus of high-modulus asphalt concrete are not reduced while the crack resistance of the high-modulus asphalt concrete is helped to be improved. When being applied to pavement middle layer pavement, the pavement anti-cracking agent can improve the anti-cracking performance of the whole pavement structure, reduce the pavement maintenance cost and improve the driving safety.

The invention relates to a high-plasticity wire rod for a hand tool and a manufacturing method of the high-plasticity wire rod, and the manufacturing method comprises the following steps: carrying out rolling, spinning, on-line molten salt isothermal toughening and roller way slow cooling treatment on a steel billet to prepare the wire rod with a microscopic structure comprising tempered bainite and ferrite, phase change and isothermal toughening treatment of the wire rod in a ferrite and bainite mixed phase region are controlled through online molten salt isothermal toughening, the wire rod adopts Cr-V chemical component design, the content of alloy elements such as Mn and V is relatively low, the online molten salt isothermal toughening technology is combined, the material cost and the mechanical property fluctuation of the wire rod can be reduced, the plasticity and cold machining performance of the wire rod are effectively improved, and the service life of the wire rod is prolonged. The tensile strength of the wire rod is 910-960 MPa, the percentage reduction of area is 58%-65%, extra heat treatment before cold machining of a hand tool is omitted, the cracking risk of direct cold machining of the wire rod is reduced, and the machining cost of the hand tool is reduced.

The invention relates to the technical field of special functional coating materials for lost foam casting, and particularly discloses a special coating for a large machine tool casting lost foam as well as application and a use method of the special coating. According to the invention, the full-temperature-range functional composite material and the composite aggregate are used for synergistic reinforcement, and mullite is used for high-temperature reinforcement; the temperature-sensitive polymer modified graphite can realize intelligent temperature response of graphite performance; spodumene is used as a thermal expansion adaptive fluxing agent, so that medium-temperature healing and thermal expansion adjustment of a coating system are facilitated; the composite reinforced fibers are reinforced and toughened aiming at large thermal stress of thick and large parts; as an ultralow-temperature glazing agent, the boron-containing glazing agent can form an initial liquid phase at about 450 DEG C to seal the surface of the coating and purify a ventilation channel; the rare earth oxide serving as a high-temperature phase stabilizer can be dissolved in mullite crystal lattices, so that the high-temperature phase stability is improved, and ceramic nodes are refined. Through raw material design, on the premise of ensuring moderate air permeability, the ultrahigh strength and crack resistance of a coating system at extremely high temperature are improved.

The invention discloses a water-based nano anti-crack waterproof agent for concrete and a preparation method of the water-based nano anti-crack waterproof agent, and relates to the field of building materials. 10 to 25% of a silane emulsion; 20-40% of an acrylate copolymer emulsion; 0.5 to 5% of modified nano cellulose; 3-8% of a polycarboxylic acid water reducer; 0.1-1% of a defoaming agent; and the balance of water. Nano silica sol permeates concrete capillary pores and participates in a hydration reaction to improve the compactness of a matrix, a three-dimensional toughening network is constructed in cooperation with oriented crosslinking of carboxyl on the surface of TEMPO oxidized nano cellulose and gamma-aminopropyl silane, and micro cracks are covered with a flexible sealing layer formed by an acrylate copolymer. Active inhibition of cracks and long-acting blocking of water are synergistically realized, shearing force is regulated and controlled in a segmented manner through a stepped stirring process, the demulsification risk of an emulsion is avoided, and the storage stability of a system is remarkably improved.

The invention discloses a fracture toughness prediction method for a non-continuous bionic Brini-gang structure, and belongs to the field of bionic composite material design. The prediction method comprises the following steps: S1, acquiring geometric and material parameters of a discontinuous bionic Belii Vagina structure; s2, constructing a fracture mechanics theoretical model of the structure; s3, solving the opening displacement of the fracture tip of the bionic Belii gang structure by adopting a numerical method; and S4, calculating parameters such as a crack propagation resistance curve and fracture toughness according to the crack tip opening displacement. According to the fracture toughness prediction method of the non-continuous bionic Beliolian structure provided by the invention, fracture parameters such as crack tip opening displacement and a crack propagation resistance curve can be obtained by taking microscopic sizes and material parameters of fibers and a matrix of the structure as input, and the prediction method not only can reveal fracture characteristics and a toughening mechanism of the bionic Beliolian structure, but also can obtain fracture parameters such as fracture toughness of the bionic Beliolian structure. And the method can also be used for optimal design of a bionic Brini spine structure.

The invention discloses stable zirconia high-toughness ceramic and a preparation method thereof.The stable zirconia high-toughness ceramic comprises a base material, a reinforcing phase and an interface transition zone, the base material is Y2O3-ZrO2 nano powder, the reinforcing phase comprises compact layers and porous layers which are alternately distributed, the compact layers enable alumina whiskers to be radially distributed in the radial direction, and the porous layers enable the alumina whiskers to be evenly distributed in the radial direction; a crystal whisker-nano particle-matrix three-stage toughening network is formed, a porous layer contains beta-Si3N4 crystal whiskers generated in situ, and an interface transition region is a ZrO2-beta-Si3N4 eutectic layer. According to the invention, the whisker is added, the fracture energy is consumed through the pull-out effect, the nano-particles inhibit crack propagation through the pinning effect, the matrix phase change is toughened, the fracture toughness of the ceramic is improved, and the crack propagation path is prolonged by 3-5 times. On the other hand, the sintering temperature is reduced, so that energy consumption is reduced.

The invention discloses a high-toughness grouting material and a preparation method thereof, and belongs to the technical field of building materials. The photochromic thermal insulation material is prepared from the following raw materials in percentage by mass: 30 to 36 percent of sulphoaluminate cement, 28 to 32 percent of quartz sand, 0.4 to 0.9 percent of nano graphene / carbon tube hybrid, 12 to 15 percent of superfine composite admixture, 1.0 to 1.8 percent of temperature-sensitive shape memory alloy fiber, 1.5 to 2.0 percent of microbial self-repairing capsule, 15 to 18 percent of photochromic epoxy hybrid emulsion, 0.2 to 0.35 percent of polycarboxylate superplasticizer and 0.8 to 1.2 percent of magnetic iron oxide coated SiO2 expanding agent. According to the invention, the active inhibition that the crack width is less than or equal to 0.05 mm is realized through the shrinkage compensation of the magnetic field oriented expanding agent, the temperature-sensitive fiber phase change toughening and the photochromism-microorganism synergistic repair.

The invention belongs to the technical field of cement stabilized macadam mixture preparation, and particularly relates to an RAP oil-rich material doped anti-crack cement stabilized macadam mixture and a preparation method thereof. The RAP oil-rich material-doped anti-crack cement stabilized macadam mixture comprises a solid material and water, wherein the solid material comprises the following raw materials in percentage by mass: 4-8% of cement, 20-25% of RAP oil-rich fine aggregate, 3-6% of rubber powder, 0.2-0.6% of an auxiliary agent and the balance of macadam. According to the invention, the production cost of the mixture is reduced by using cheap old asphalt brought in by RAP oil-rich fine aggregate; by utilizing the toughening effect of the old asphalt and the rubber powder, the crack resistance of the mixture is improved; the characteristics of cement stabilized macadam cold material production are utilized, the requirement for RAP oil-rich fine aggregate feeding is met, and the requirement for large-mixing-amount recycling of 0-3 mm grade RAP fine separation materials is met.

The invention discloses a cable insulation material preparation method, which comprises: S1, pre-mixing modified nanoparticles and epoxidized soybean oil to form a mixture; s2, 30 to 50 parts of mixed resin, 15 to 20 parts of a mixture, 0.1 to 0.4 part of an antioxidant, 0.2 to 0.6 part of a cross-linking agent and 1 to 2 parts of a toughening agent are weighed; s3, respectively adding the mixed resin, the mixture, the antioxidant, the cross-linking agent and the flexibilizer into a double-screw extruder, and carrying out partitioned temperature control to obtain a molten resin matrix. The invention belongs to the technical field of cable insulation material preparation, and aims to solve the problems that in the prior art, the intermolecular toughness is relatively small, so that the cable insulation material becomes more brittle, and the cable insulation material is easy to crack during bending. The cable insulation material has the technical effects that the intermolecular toughness of the cable insulation material can be remarkably improved, and then the problems that the brittleness is increased and the cable insulation material is easy to crack when being bent due to large internal stress generated in the cable insulation material can be effectively avoided.

The invention discloses self-repairing and rapid-repairing cement-based mortar and a preparation method thereof, and belongs to the technical field of building materials. The self-repairing and rapid-repairing cement-based mortar is prepared from the following raw materials: 5500-6500 parts of a composite cementing material; 200 to 650 parts of an inorganic permeable crystalline material; 1500 to 3500 parts of a filling material; 307 to 510 parts of a rapid hardening component; 2-5 parts of a moisturizing and thickening component; 150 to 250 parts of a toughening and softening component; and 6-10 parts of a water reducing agent. The preparation method of the self-repairing and rapid-repairing cement-based mortar comprises the following steps: preparing the raw materials according to the proportion, uniformly mixing, adding the mixing water, and uniformly mixing to obtain the self-repairing and rapid-repairing cement-based mortar. The self-repairing quick-repairing cement-based mortar is efficient in water resistance and leaking stoppage, quick in setting and hardening and high in hour strength and has the function of silt; and a good self-repairing capability is achieved for microcosmic cracks of 0.1 mm.

The invention relates to the technical field of fiber reinforced composite materials, in particular to a basalt fiber reinforced composite board in a dynamic heavy load environment and a preparation method. The basalt fiber reinforced composite board comprises an upper surface layer, an upper reinforcing layer, a core layer, a lower reinforcing layer and a lower surface layer. According to the invention, rigid nanoparticles and carboxyl-terminated nitrile rubber are introduced to construct a rigid-flexible composite toughening system, and nano aluminum oxide and silicon dioxide are taken as rigid particles and are uniformly dispersed in an epoxy cross-linked network, so that slippage and crack propagation of molecular chains can be effectively hindered, and the rigidity and damage resistance of a matrix are improved; meanwhile, the carboxyl-terminated nitrile rubber is used as reactive liquid rubber, after carboxyl of the carboxyl-terminated nitrile rubber reacts with epoxy groups, the carboxyl-terminated nitrile rubber is distributed in a matrix in a sea-island structure and can serve as stress concentration points, a large amount of crazing and shear bands can be induced, and a large amount of impact energy can be consumed; and the impact toughness is greatly improved while the high strength of the material is maintained.

The invention discloses a toughened glass ceramic and a preparation method thereof, and relates to the technical field of glass ceramics, and the toughened glass ceramic comprises the following components in percentage by weight: 64 to 68 weight percent of silicon dioxide, 22.67 to 26.5 weight percent of lithium oxide, 0.9 to 1.2 weight percent of antibacterial agent, 0.8 to 1.1 weight percent of modified mica powder, 1.98 to 2 weight percent of aluminum oxide, 1.78 to 1.8 weight percent of potassium oxide, 1.68 to 1.7 weight percent of zirconium dioxide, 1.19 to 1.2 weight percent of phosphorus pentoxide and 1 to 3 weight percent of calcium fluoride. According to the toughened glass ceramic and the preparation method thereof, a multi-scale anti-cracking network is formed through macroscopic crack deflection of mica and nanoscale phase change toughening of zirconium oxide, the fracture toughness is remarkably improved, zirconium oxide agglomeration can be reduced through interface optimization of modified mica powder, zirconium oxide is dispersed more uniformly, and the phase change potential is further exerted; due to high-temperature stability of aluminum oxide, antibacterial agent particles can be wrapped, and excessive volatilization or aggregation of the antibacterial agent particles in the sintering process is prevented; aluminum oxide is used as a'protective shell 'to delay the Cu < 2 + > release rate and realize long-acting antibiosis.

The invention belongs to the technical field of composite ceramics, and discloses a synergistically reinforced silicon nitride composite ceramic, and a preparation method and application thereof, the raw materials comprise the following components by mass: 40-90 parts of alpha-Si3N4; 8-15 parts of a sintering aid; 0.1 to 15 parts of nano TiN; 0.1 to 12 parts of SiCw (silicon carbide w); in the sintering aid, the mass ratio of Al2O3 to Y2O3 to CaF2 is (5-10): (1-5): (0.5-3). According to the invention, the nano TiN particles and directionally arranged SiCw are creatively added, and freeze drying and hot pressed sintering technologies are combined, so that the problem that strength and toughness of Si3N4 ceramic are difficult to synchronously improve in the prior art is solved, and the defect of poor toughening effect caused by random distribution of a whisker toughening phase in a matrix is overcome. By accurately regulating and controlling the microstructure, uniform dispersion and directional arrangement of a reinforcement phase are realized, the toughening potential of the whisker is fully exerted, and the comprehensive mechanical property of the Si3N4 ceramic is remarkably improved.

The invention discloses a metal powder metallurgy forming process, and belongs to the technical field of metal powder metallurgy. The process comprises the following steps: preparing a metal mixture containing tungsten, copper, nickel, iron and an interface toughening agent according to a specific proportion, adding a polyvinyl alcohol aqueous solution, and uniformly stirring; carrying out compression molding on the mixture to obtain a green body; performing high-temperature sintering steps such as pre-sintering, sintering and cooling to obtain a sintered blank; and finally shaping to obtain a finished product. Compared with the prior art, the fracture toughness and elongation performance of the material are remarkably improved, innovative breakthrough is brought to a metal powder metallurgy forming process, and the method can be widely applied to the fields of aerospace, automobile manufacturing and the like to meet the requirements for high-performance metal parts.

The invention discloses daily high-strength environment-friendly ceramic and a preparation process thereof, and particularly relates to the field of ceramic materials, and the preparation process comprises the following steps: S1, preparation and molding of green body powder, S2, preparation of multifunctional glaze slip, and S3, glazing and sintering. By introducing the pre-compounded reinforced fiber, the SiO2-Al2O3 coating on the surface of the pre-compounded reinforced fiber and the ceramic matrix form strong interface bonding at high temperature, so that the comprehensive mechanical property of the green body is improved, the load is effectively transmitted and dispersed, and meanwhile, the fiber has remarkable toughening and impact resisting effects; due to the addition of the biomass derived porous carbon powder, the fracture toughness and thermal shock resistance of the material are further improved through the pore-forming and buffering effects of the biomass derived porous carbon powder; while high bending strength is maintained, impact toughness is improved in a breakthrough manner, and the composite material is more suitable for collision scenes in daily use.

The invention relates to a wear-resistant modified glass fiber and a preparation method thereof, and belongs to the technical field of high polymer materials. The wear-resistant modified glass fiber is prepared from the following components in parts by weight: 40 to 60 parts of SiO2, 10 to 15 parts of Al2O3, 20 to 30 parts of CaO, 1 to 3 parts of Fe2O3, 1 to 3 parts of CeO2, 2 to 10 parts of modified toughening agent and 2 to 10 parts of wear-resistant filler, the flexibility and elasticity of polydopamine in the modified toughening agent can reduce the generation and expansion of cracks, and polydopamine cooperates with modified silicon nitride to increase the toughness and the adhesiveness and bonding performance of polyethyleneimine, so that the material is not easy to damage when bearing an external force; graphite oxide in the wear-resistant filler endows strength and heat resistance, molybdenum disulfide provides lubricity, a pre-product contributes to improvement of interface performance, and polytetrafluoroethylene and molybdenum disulfide synergistically improve wear resistance and lubricity; the wear-resistant modified glass fiber prepared by the invention not only has a good toughening effect, but also has an excellent wear-resistant effect.

The invention relates to the technical field of ceramic substrates, and provides a heat-resistant multilayer ceramic substrate and a preparation method thereof. The heat-resistant multilayer ceramic substrate comprises the following raw materials in parts by weight: 75-80 parts of aluminum oxide, 1-3 parts of a sintering aid, 82-92 parts of a solvent, 8-14 parts of a binder, 0.5-1.5 parts of a dispersant and 2-6 parts of a flexibilizer. The toughening agent comprises a core-shell structure compound and a calcium-containing compound; the core layer of the core-shell structure compound is titanium dioxide, and the shell layer of the core-shell structure compound is zirconium oxide. According to the technical scheme, the problem that the fracture toughness of the heat-resistant multilayer ceramic substrate is low in the prior art is solved.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a YSZ and graphene synergistically toughened WC ceramic composite material and a preparation method thereof, and a proper amount of YSZ and graphene are added into WC ceramic to effectively toughen the WC ceramic. The uniformly mixed WC and YSZ mixed powder is prepared by adopting a coprecipitation method, and then the graphene powder is mixed to prepare the YSZ and graphene synergistically toughened WC ceramic composite material, so that the fracture toughness of the material can be effectively improved while the hardness of the material is ensured.

The invention relates to the technical field of reinforced concrete, in particular to a preparation technology of a reinforced concrete telegraph pole, the performance of the concrete telegraph pole is improved through a multi-scale fiber synergistic toughening method, when the telegraph pole bears a bending load, steel fibers firstly play a role to restrain large cracks, and when micro cracks appear, the steel fibers play a role to restrain the large cracks. The denser composite fiber network bears stress to realize multi-stage crack resistance, which is combined with the high early strength characteristic of the sulphoaluminate cement, so that the telegraph pole has excellent impact resistance and fatigue resistance while obtaining extremely high early strength; the surface of the aggregate modified by the silicon dioxide aerogel is covered with a high-activity and high-specific-surface-area nano silicon dioxide layer, and in an alkali-rich and calcium-rich environment provided by sulfo-aluminate water cement hydration, the nano silicon dioxide and a cement hydration product are subjected to a violent pozzolanic reaction, so that the surface of the aggregate is modified by the sulfo-aluminate water cement; therefore, the compressive strength and the flexural tensile strength of the concrete are remarkably improved.

The invention is suitable for the technical field of polyethylene pipeline materials, and provides a high-crack-resistance and high-durability medium-pressure polyethylene pipeline material and a preparation method thereof. Comprising the following components in parts by weight: 100 to 140 parts of medium-pressure polyethylene, 5 to 7 parts of tetra (octadecyloxy) phthalocyanine, 0.6 to 1.2 parts of a nucleating agent, 2 to 4 parts of nano silicon dioxide, 1.5 to 4.5 parts of montmorillonite, 1.3 to 2.7 parts of carbon black, 0.7 to 1.4 parts of a surfactant and 1.1 to 2.6 parts of a toughening agent. Preferably, the preparation method of the tetra (octadecyloxy) phthalocyanine comprises the following steps: adding tetrachloro phthalocyanine and octadecanol into a container according to a molar ratio of 1: 4, then adding a proper amount of K2CO3, taking DMF (Dimethyl Formamide) as a solvent, reacting under the protection of nitrogen, after the reaction is finished, adding ice water, filtering, and recrystallizing with methanol. The crack resistance and durability of the polyethylene pipeline material are remarkably improved, in addition, the preparation method is simple and easy to implement and easy for industrial production, and the prepared medium-pressure polyethylene pipeline material is low in cost and has a wide application prospect.