54results about How to "Stable mechanical properties" patented technology

The application provides a multi-scale simulation method of a catalytic reaction process, comprising the following steps: (1) constructing a micro-element structure; (2) establishing a calculation model of a physical and chemical reaction system in the micro-element structure; (3) simulating and obtaining reaction kinetics parameters of the micro-element structure; (4) constructing a representative unit structure; (5) establishing a calculation model of a physical and chemical reaction system in the representative unit structure; (6) simulating and obtaining reaction kinetics parameters of the representative unit structure; (7) establishing and solving diffusion-reaction equations of a single catalyst particle; (8) establishing a reactor model and realizing real-time coupling calculation of reaction-diffusion-flow on the single catalyst particle; and (9) obtaining target performance parameters. The multi-scale simulation method accurately describes the internal structure of the catalyst and the space-time distribution of gas phase components in the catalyst and the space-time distribution of a flow field in a reactor bed layer, and effectively serves catalyst optimization design and reactor scale-up design.

The invention relates to the technical field of martensitic steel, in particular to a 04Cr13Ni5Mo stainless steel plate rolling and temperature control process, which comprises the following steps: heating a pretreated blank to 1190-1210 DEG C at a heating rate of more than 0 DEG C and less than or equal to 5 DEG C / min, and soaking for more than or equal to 2 hours; the rolling reduction rate of the blank is controlled to be 12%-15%, and compared with the reduction rate of the pass before final rolling, the reduction rate is reduced by 20%-25%; stacking slow cooling is larger than or equal to 550 DEG C, and the plate yield is increased by 30% or Through heat treatment processes of normalizing at 1040 DEG C + / -10 DEG C, preserving heat of a plate with the thickness of 85 mm for 4 hours, preserving heat of a plate with the thickness of 115 mm for 5 hours, tempering at 620 DEG C + / -10 DEG C, preserving heat of the plate with the thickness of 85 mm for 6 hours and preserving heat of the plate with the thickness of 115 mm for 8 hours, the yield ratio is stabilized at 0.8-0.85, and the uniformity of mechanical properties is improved by 25%. The stable yield ratio reduces the deformation amplitude of plates and workpieces by more than 40% during later processing, additional repair is not needed, and the production cost is reduced.

The invention is suitable for the technical field of materials, and discloses silica gel and a preparation method thereof, and a silica gel product and a preparation method thereof. Wherein the silica gel comprises a first component and a second component, the first component comprises a base material, a reinforcing agent, a modified filler, titanium dioxide and a vulcanizing agent, and the second component comprises a base material, a reinforcing agent, a modified filler, titanium dioxide, a cross-linking agent and a polymerization inhibitor. The silica gel provided by the invention not only has better mechanical properties, but also has a small friction coefficient, when the silica gel is in contact with skin, the adhesion feeling is low, the smooth effect is good, and the smooth feeling and the skin-friendly property are improved. Moreover, two components, namely the first component and the second component, are arranged, the first component and the second component are stored separately, the material is easy to store and stable in performance, the service life of the product can be prolonged, in addition, the material preparation and forming process is simple, the vulcanization time is short, and the production efficiency is greatly improved.

This invention provides a hydrophobic solvent and coating, comprising the following components by weight: perfluoronaphthalene: 93-94.5 wt%; methyl undecanoate: 5-5.3 wt%; perfluoropolyether trimethoxysilane: 0.2-0.8 wt%. This invention constructs a low surface energy layer on the substrate surface using perfluoropolyether trimethoxysilane, weakening the adhesion between water and the coating. During windshield wipes, no white fog is visible, solving the problem of residual white fog after wiping with traditional coatings. Simultaneously, the film-forming substance forms chemical bonds with the hydroxyl groups of the substrate, resulting in high adhesion and coating hardness, stable basic hydrophobicity and mechanical properties, meeting the needs of conventional applications.

The present application relates to the technical field of ceramic coating, especially to a micro-nano structure ceramic coating and its application on the reaction furnace of zircon sand boiling chlorination method, aiming at solving the problems of weak bonding force between the existing protective coating and the substrate, poor thermal shock resistance and easy failure in long-term high-temperature chlorine environment; the present application constructs a nano-wire reinforced micro-nano structure transition layer on the surface of porous corundum brick substrate in situ, and sequentially constructs a lanthanum phosphate bonding layer and a yttrium stabilized zirconium oxide barrier layer on the transition layer; the design utilizes the mechanical anchoring effect of micro-nano structure and the strong chemical bonding ability of lanthanum phosphate to realize the firm combination of the coating and the substrate; the dense characteristics of the zirconium oxide layer provide ultimate protection; the method significantly improves the overall anti-peeling ability and long-term corrosion resistance of the coating system.

The invention relates to the technical field of aluminum alloy preparation, in particular to a 7075 aluminum alloy sheet and a preparation method thereof. The preparation method comprises the following steps: A) melting raw materials with specific components, and preserving heat at 720-760 DEG C; (B) carrying out furnace bottom degassing refining on the obtained melt, and then filtering; c) carrying out grain refinement on the obtained melt by adopting a refiner; d) casting the obtained melt under specific casting parameters to obtain a cast ingot; the method comprises the following steps of (1) carrying out primary soaking treatment on a cast ingot, (2) carrying out secondary soaking treatment on the cast ingot, (3) carrying out secondary soaking treatment on the cast ingot, and (4) carrying out rolling deformation on the treated cast ingot to obtain the 7075 aluminum alloy sheet. The cast ingot prepared through the method is fine in grain and compound and more dispersed and uniform in tissue distribution, and the finally obtained 7075 aluminum alloy sheet is stable in mechanical property and small in fluctuation range.

The invention belongs to the technical field of metallurgy, and particularly relates to 590MPa-grade hot galvanizing dual-phase steel and a production method thereof, and the steel comprises the following chemical components in percentage by mass: 0.02%-0.06% of C, 0.01%-0.03% of Si, 0.90%-1.8% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, 0.005%-0.010% of Al, 0.05%-0.30% of Cr, 0.05%-0.30% of Mo, less than or equal to 0.0060% of O, 0.010%-0.020% of N, and the balance of Fe and inevitable impurities. The method has the advantages that low carbon-silicon-aluminum and high nitrogen are cooperatively regulated and controlled in component design, and in the hot rolling process, premature precipitation of AlN particles in the hot rolling process is effectively inhibited by controlling the low coiling temperature, so that a large amount of nitrogen is reserved in a hot rolled plate in a solid solution state.

The present application relates to a kind of production methods of double-layer alloy composite seamless pipe.The outer layer material of double-layer alloy composite seamless pipe is low-carbon steel, the inner layer material is nickel-based alloy, outer layer alloy bar material is continuous casting billet or rolling blank, and inner layer alloy bar material is forging blank.The production steps are: (1) blank preparation; (2) upsetting; (3) blank machining; (4) hot expansion; (5) hot extrusion; (6) heat treatment; (7) surface treatment; (8) cold rolling; (9) finishing treatment.The blank preparation process includes: (1) theoretical calculation; (2) blanking; (3) electroplating; (4) blank assembly; (5) head and tail pad welding.The double-layer alloy composite seamless pipe produced by the present application has firm combination of the inner and outer layers of alloy, reduces the defects of extrusion delamination, the outer layer alloy has high strength, the inner layer alloy has good corrosion resistance, improves the yield rate of processing defects, and reduces material cost.

The invention relates to the technical field of building curtain walls, in particular to a temperature control adjusting system and method for a breathing type curtain wall, and the system comprises an inner circulation module which is used for guiding indoor air into a cavity of the breathing type curtain wall and returning the indoor air after heat exchange; the outer circulation module is used for guiding outdoor air into the cavity of the breathing type curtain wall, carrying out heat exchange and then discharging the outdoor air; a data acquisition module; a data processing module; the control module is used for judging whether the temperature control of the room meets a preset standard or not according to the temperature control stability characterization value; and the optimization module is used for determining a temperature control optimization strategy when the temperature control of the breathing type curtain wall does not meet a preset standard according to the current deviation degree of the room with the abnormal temperature and secondarily determining the temperature control optimization strategy of the room with the abnormal temperature according to the indoor interference characterization value of the room with the abnormal temperature. The temperature control efficiency of the breathing type curtain wall is improved.

The utility model discloses a high-temperature-resistant lining oil pumping pipe, which relates to the technical field of oil exploitation and comprises an oil pumping pipe body, a lining pipe is arranged inside the oil pumping pipe body, the outer side of the oil pumping pipe body is in threaded connection with a coupling main body, and a sealing ring is fixedly connected inside the coupling main body. One end of the sealing ring abuts against one end of the oil pumping pipe body and one end of the lining pipe, the oil pumping pipe body is made of alloy steel materials, and a heat insulation layer is arranged on the outer side of the oil pumping pipe body. According to the oil pumping pipe with the high-temperature-resistant lining, the oil pumping pipe body made of alloy steel materials containing high chromium and nickel elements is combined with the heat insulation layer wrapped by the outer-layer heat-resistant fiber materials and the polytetrafluoroethylene lining pipe to form a composite material structure. Not only are many defects of a traditional pipeline in the high-temperature and high-pressure environment effectively overcome, but also the efficiency and the safety of the whole system are improved, and the strict requirements of modern oil exploitation for equipment are met.

The application discloses an environment-friendly rubber composite material and a preparation method and application thereof, and relates to the technical field of tire rubber materials.The environment-friendly rubber composite material comprises, in parts by mass, 100 parts of a rubber matrix, 10-60 parts of a bio-based filler, 0.5-10 parts of an interface modifier, 1-8 parts of a vulcanizing component and 0.5-5 parts of a crosslinking aid; wherein the rubber matrix comprises natural rubber and butadiene rubber; the bio-based filler comprises at least one of lignin, cellulose or a derivative thereof; the interface modifier comprises a compounded system of a silane coupling agent and a bio-based small molecule containing multiple functional groups; and the crosslinking aid comprises a borate compound and a low-molecular polymer containing a dynamic hydrogen bond structure.The application also provides a preparation method and application of the material.The application improves the proportion of the bio-based material, improves the long-term stability of the interface between the bio-based filler and the rubber matrix, reduces the interface damage accumulation and dynamic heat generation under the action of cyclic load, and improves the fatigue performance and comprehensive service performance of the rubber composite material.

The utility model discloses an anti-bending screw which comprises a screw body, the inner wall of the screw body is fixedly connected with a truss mechanism, the right-angle position of the truss mechanism is fixedly connected with a slope table, a rubber pad is placed on the top of the slope table, a countersunk bolt penetrates through the top of the rubber pad, and the countersunk bolt is in threaded connection with a cross-shaped rib plate. The top of the rubber pad is fixedly connected with a truss mechanism, the truss mechanism is fixedly connected with the inner wall of the screw main body, the inner surface of the truss mechanism is fixedly connected with an anti-buckling supporting assembly, the truss mechanism comprises a vertical rod, an upper chord and a lower chord, the vertical rod is fixedly connected to the top of the rubber pad, and the upper chord is fixedly connected to one side of the vertical rod. And the other side of the upper chord member is fixedly connected with the other vertical rod. According to the utility model, local deformation and even bending damage of the screw rod under bending moment can be prevented, and external load can be prevented from being concentrated on local parts, so that the reliability when the pressure in concrete is higher is improved.

This invention provides a method for fabricating a CNTs / PDMS microstructure triboelectric nanogenerator, comprising the following steps: PCL particles are poured into the barrel of a 3D printing device and formed onto a printing receiver plate side by near-field direct writing and fused deposition modeling to obtain a PCL film with two patterns; a mixture of PDMS and a curing agent is stirred, carbon nanotubes are added and stirred further, followed by ultrasonication to obtain a mixed solution; the mixed solution is coated onto the PCL film, followed by vacuum treatment; the film is heated and dried to obtain a dielectric layer; the PCL on the film surface is removed to obtain a CNTs / PDMS dielectric layer; a copper foil is covered on the smooth surface of the dielectric layer as one end electrode, a PET layer is attached as a protective layer, and the other side is covered with copper foil to obtain another electrode; PET is then placed on top, and wires are led out from the two electrodes to connect to a load, thus obtaining the nanogenerator. This invention provides a method for fabricating a nanogenerator with low fabrication requirements and capable of producing nanogenerators with good overall performance.

The invention discloses a targeted fragrance guiding method and system for a tobacco sheet, the tobacco sheet is subjected to reversible perforation treatment to form reversible micropores in the tobacco sheet, the reversible perforation treatment is an electroporation process, and the electric field intensity of the electroporation process is 180-250V / cm; targeted fragrance guiding treatment is conducted on the tobacco sheet containing the reversible micropores, then curing treatment is conducted to promote the reversible micropores in the tobacco sheet to be closed, the fragrance-guiding tobacco sheet is obtained, the essence penetration depth of the fragrance-guiding tobacco sheet is larger than or equal to 0.8 mm, and the fragrance retention rate of the fragrance-guiding tobacco sheet stored for 6 months is larger than or equal to 90%. According to the invention, the aims of avoiding poor deep penetration, non-uniform essence penetration distribution and tobacco fragrance damage in the fragrance guide process are fulfilled.

The application belongs to the field of steel material and its preparation technology, and discloses a high strength and toughness steel plate for liquid hydrogen storage and transportation and a preparation method thereof. The mass percentage of each chemical component is controlled and the film-like reversed austenite formation tendency index is satisfied. Through reasonable component proportioning, high cleanliness smelting, continuous casting, rolling and heat treatment synergic control, a dual-phase structure of tempered martensite and film-like reversed austenite is obtained, the volume fraction of the film-like reversed austenite is 8% to 20%, and the volume fraction of the block or island-like reversed austenite is not more than 3%. The steel plate has the room temperature yield strength of greater than or equal to 600 MPa, the tensile strength of greater than or equal to 750 MPa and the impact energy of greater than or equal to 70 J at-253 DEG C in the thickness range of 6 to 50 mm, the structure and performance in the thickness direction are uniform, the steel plate has high strength, super-low temperature high toughness and excellent hydrogen damage resistance, and is suitable for liquid hydrogen storage tanks and related low-temperature pressure vessels.

The application discloses a forming method and device for thick-wall corrosion-resistant alloy pipe with yield strength of 100 steel grade, which comprises the following steps: smelting an electroslag ingot by an electric arc furnace and electroslag remelting; taking scrap steel and alloy as raw materials, smelting an electrode billet by EAF+AOD+LF+VD, and then smelting the electroslag ingot by electroslag remelting. The forming method and device for thick-wall corrosion-resistant alloy pipe with yield strength of 100 steel grade adopts the process route of combining optimized components, electroslag ingot, hot expanding, hot extrusion and cold working to produce thick-wall corrosion-resistant alloy seamless pipe, so that the purity of the alloy is improved, the grain is refined, the solid solution treatment of the strong cold process optimizes the organization and straightness, and the hot expanding and hot extrusion improve the surface quality and the qualified rate of the hollow pipe. The thick-wall corrosion-resistant alloy seamless pipe with yield strength of 100 steel grade produced by the application has high size precision, good surface quality, small internal grain, stable mechanical properties, high strength and high toughness and good corrosion resistance.

This invention relates to the field of polymer materials technology, and discloses a high-elasticity rubber-plastic insulated cable composite material and its preparation method. The high-elasticity rubber-plastic insulation material comprises, by weight, 40-50 parts of EPDM rubber, 20-25 parts of polyolefin elastomer, 30-35 parts of modified calcined kaolin, 3-5 parts of composite antioxidant, 2-3 parts of silane coupling agent, and 1.5-2 parts of vulcanizing agent. During preparation, EPDM rubber and polyolefin elastomer are kneaded for 5-8 minutes, then modified calcined kaolin and silane coupling agent are added and kneaded for another 8-12 minutes, followed by the addition of composite antioxidant and vulcanizing agent and kneading for 3-5 minutes. Finally, the mixture is vulcanized in stages. The first stage vulcanization temperature is 155-160℃, and the second stage vulcanization temperature is 165-170℃. The insulating material prepared by this invention has excellent elasticity, outstanding resistance to flexural fatigue, stable insulation performance, high volume resistivity, excellent aging resistance, and tight interfacial bonding. It is suitable for use in high-voltage cable insulation layers, effectively extending the service life and stability of the cable.

This application relates to the field of sealing materials, specifically disclosing an insulating sealing gasket for nuclear power equipment and its preparation method. The insulating sealing gasket for nuclear power equipment of this application comprises an outer layer material and an inner layer material, with the outer layer material covering the surface of the inner layer material. The outer layer material is composed of the following components by mass percentage: 50%-60% silane coupling agent modified phenolic resin, 35%-45% composite fiber, and 3%-5% epoxy functionalized silane bonding accelerator. The inner layer material is composed of the following components by mass percentage: 45%-55% fluorine-modified epoxy resin, 30%-40% polyimide fiber, and 10%-20% high-temperature resistant nano-reinforced microspheres. The insulating sealing gasket for nuclear power equipment of this application has the advantages of high pressure resistance and high temperature resistance.

The application discloses a kind of bionic composite leather preparation method, the surface of porous artificial leather substrate is pretreated to introduce active group;Bionic adhesion peptide solution is applied to the surface of pretreated substrate, incubation forms interface reinforcement layer;Spinning fluid containing recombinant spider silk protein is applied to the surface of interface reinforcement layer by electrospinning or wet co-deposition process, induces spider silk protein in situ self-assembly, forms nanofiber network precursor layer;Gradient crosslinking post-processing is carried out to nanofiber network precursor layer, and gradient crosslinking structure that crosslinking density gradually increases from the side close to substrate to the side far from substrate is obtained;Through the cooperation of the three steps of interface reinforcement layer, spider silk protein in situ self-assembly, nanofiber network precursor layer gradient crosslinking, the interface incompatibility problem between hydrophilic spider silk protein and hydrophobic artificial leather substrate is solved, and the interface bonding strength is significantly improved.

The utility model relates to the field of composite fabrics, in particular to a sandwich fabric with high strength, which sequentially comprises a surface layer, a supporting layer and a bottom layer from top to bottom, the supporting layer comprises conical cavities and three-dimensional net-shaped fillers, the conical cavities are formed by three-dimensional twisting and weaving, the conical cavities are uniformly distributed on one surface of the supporting layer, and the three-dimensional net-shaped fillers are filled with the three-dimensional net-shaped fillers. And free yarns are reserved on the two surfaces of the supporting layer. The surface of the small opening supporting layer of the conical cavity is designed to be horizontal, after glue spraying, printing or roller coating is conducted, the conical structure can form a siphoning effect, fluid substances at the interface position are siphoned into the cavity from the small opening position, combination at the interface position is more stable after solidification, and the service life of the interface is prolonged. And the free yarns can be sealed in the solidified fluid substance, so that the strength of the fabric is further improved.

This invention provides a silk fibroin gel and its preparation method, relating to the biomedical field. The preparation method includes: (1) dissolving degummed silk or regenerated silk fibroin in a lithium bromide solution to obtain a silk fibroin solution; (2) adding a crosslinking agent and sodium hyaluronate to the silk fibroin solution, mixing well, and then incubating to obtain a silk fibroin gel; wherein the amount of sodium hyaluronate is 2% to 14% of the amount of degummed silk or regenerated silk fibroin. The silk fibroin gel prepared by this invention has stable mechanical properties and can be stored stably for a long time, exhibiting excellent biocompatibility and filling properties.

The application relates to the field of additive manufacturing technology, in particular to a 3D printing high-strength and high-toughness aluminum alloy powder, an alloy component and a preparation method thereof. The 3D printing high-strength and high-toughness aluminum alloy powder comprises, in percentage by mass, Zn 5-8%, Mg 2-4%, Cu 1-2%, Ti 0.3-4%, Cr 0.1-0.3%, Mn 0.65-2% and C 0.01-0.3%, and the balance is Al and inevitable impurities. The application controls the content and proportion of Zn, Mg, Cu, Ti, Cr, Mn and C in the alloy, adjusts and controls the solidification behavior in the additive manufacturing process, obtains fine equiaxed crystals, has a large number of dispersed distribution precipitates, and can effectively improve the compactness, strength, crack propagation resistance and the like of the alloy.

The utility model provides a panel furniture PUR glue machine glue pot glue amount control structure which comprises a glue pot, an air cylinder and a control valve, the top of the glue pot is provided with the control valve, the control valve is connected with the air cylinder, the top of the glue pot is provided with a heat insulation connecting assembly and a glue pot connecting plate, the air cylinder is connected with the control valve through the glue pot connecting plate, and the heat insulation connecting assembly is connected with the control valve through the air cylinder. The heat insulation connecting assembly is connected with an output shaft of the air cylinder, the heat insulation connecting assembly is connected with an ejector pin, and the ejector pin is connected with a valve body of the control valve. The heat insulation connecting assembly is matched with the glue pot connecting plate, so that the air cylinder can be separated from a high-temperature environment, the working temperature of the air cylinder is obviously reduced, and the service life of the air cylinder can be prolonged by 2-3 times; the technical effect that stable mechanical performance and sealing performance can still be kept in a high-temperature environment is achieved.

The utility model discloses a sinking plate type FAKRA connector, and relates to the field of connectors, the sinking plate type FAKRA connector comprises a center pin, a medium body installed on the center pin, an outer conductor installed on the medium body and a plastic shell installed on the outer conductor, the inner wall of the outer conductor and the outer wall of the medium body form a first clamping position, and the inner wall of the outer conductor and the outer wall of the medium body form a second clamping position. The inner wall of the medium body and the center pin form a second clamping position, and the outer wall of the medium body and the inner wall of the outer conductor form a third clamping position. The connecting structure has the effects of enhancing the connecting stability and reliability and improving the convenience and rapidness of overall assembly.

This invention discloses a method for optimizing process parameters in coaxial powder-feed laser cladding, belonging to the field of laser cladding technology. The method includes the following steps: First, using laser cladding process parameters as independent variables and cladding layer performance evaluation indicators as target response values, relevant data are collected using an orthogonal experimental design. Then, using range analysis and variance analysis, the range analysis table, variance analysis table, and mean response diagram of the target response values ​​for the process parameters to the cladding layer performance evaluation indicators are calculated. Significantly influential process parameters are selected as optimization variables, and regression prediction models are established for each target response value and the optimization variables. A multi-objective optimization model for laser cladding process parameters is constructed. Finally, a fast non-dominated genetic algorithm is used to solve the Pareto front solution set of the multi-objective optimization series to obtain the optimal combination of laser cladding process parameters. This invention features a simple calculation process and high versatility; the composite material cladding layer obtained using this method has a smooth, continuous, and highly flat surface.

The application discloses a kind of polypropylene coating and preparation method thereof, belong to polypropylene coating technical field, first by photo-induced mercapto-alkene reaction preparation amino tung oil acid, again by template method copolycondensation synthesis mesoporous organosilica amino tung oil acid, simultaneously polypropylene and trifluoroethyl methacrylate melt grafting obtains TFEMA grafted modified polypropylene, finally with xylene as solvent, bismaleimide is used as crosslinking agent, and each component is blended to obtain polypropylene coating;The application is endowed with low surface energy and weathering stability by introducing fluorine-containing group to coating, combined with the ultraviolet shielding function of mesoporous organosilica, supplemented by BMI dynamic reversible crosslinking to build strong adhesion and self-repairing network, synergistically solve the technical problems that traditional polypropylene coating is poor in ultraviolet stability, weak in adhesion, and easy to age, significantly improve the outdoor durability, self-repairing and corrosion resistance of coating, and be applicable to outdoor building materials, automobile shell and other high-end protection fields with strict durability requirements.

The extra-black color paste for coloring the gum fiber stock solution comprises the following raw materials in parts by weight: 35-40 parts of modified carbon black, 10-15 parts of a dispersing agent, 2-4 parts of a pH regulator and 30-35 parts of water. According to the invention, the surface polarity of the carbon black can be improved, agglomeration can be reduced, ball milling coating is carried out through an additive solution (containing a basalt fiber modifier, boron nitride, chitosan and yttrium nitrate), the dispersion uniformity of carbon black particles is further improved, the light absorption capability can be enhanced through the uniform dispersion of the carbon black particles, the blackness of the color paste is greatly improved, and the coloring requirement of special black is met.

This invention belongs to the field of metallurgical technology, and particularly relates to a 420MPa grade galvanized low-alloy high-strength steel and its production method. The steel composition by mass percentage is as follows: C: 0.06%~0.08%, Si: 0.05%~0.08%, Mn: 0.95%~1.15%, P≤0.025%, S≤0.010%, Al: 0.015%~0.060%, O≤0.0060%, N≤0.0060%, V: 0.01%~0.03%, Ti: 0.01%~0.03%, with the balance being Fe and unavoidable impurities. The advantages are: through V-Ti composite microalloying and controlled hot and cold rolling processes, synergistic effects of fine grain strengthening and precipitation strengthening are achieved. The ferrite grain size is 2~5μm, the (Ti,V)C precipitate size is 20~30nm, the steel plate yield strength is ≥420MPa, and the elongation is maintained above 20%.

This invention belongs to the field of coating technology and provides a wear-resistant coating for drone shells and its preparation method. The raw materials of the coating include: hydrogenated bisphenol A epoxy resin, vinyl-terminated fluorinated polybutadiene resin, core-shell powder, aluminum borate nanofibers, polyetherimide micro powder, wear-resistant additives, silane coupling agent KH-792, light stabilizer, leveling agent and environmentally friendly solvent. The preparation method includes: (1) mixing hydrogenated bisphenol A epoxy resin and vinyl-terminated fluorinated polybutadiene resin to form a resin matrix; (2) first adding core-shell powder and aluminum borate nanofibers to the resin matrix for dispersion; after cooling to 25-30℃, adding other raw materials, stirring and defoaming to obtain the finished product. This coating has high wear resistance, wind and sand erosion resistance, low temperature crack resistance, microcrack self-repair, strong UV aging resistance and high adhesion, which can significantly improve the long-term service stability and service life of drone shells in complex and harsh environments such as high altitude, wind and sand, high and low temperature alternation, and strong ultraviolet radiation.

The embodiment of the application discloses an anti-stress corrosion anchor cable and a preparation method thereof, and relates to the technical field of mine engineering supporting materials.The anchor cable comprises the following chemical components in percentage by mass: C: 0.75-0.85%, Si: 0.20-0.31%, Mn: 0.72-0.91%, P: 0.009-0.018%, S: 0.0055-0.0065%, Cr: 0.19-0.30%, Ni: 0.016-0.025%, V: 0.033-0.039%, Mg: 0.0004-0.0008%, Nb<=0.0005%, Al: 0.0021-0.0029%, Ca: 0.0003-0.0006%, Sn: 0.0005-0.0010%, Co: 0.0051-0.0062%, Ti: 0.0034-0.0039%, Gd<=0.0005%, and the rest is Fe and inevitable impurities.The embodiment of the application is suitable for mine engineering supporting scenes.