1210 results about "Oxidation resistant" patented technology

The invention discloses copper-containing slurry suitable for high-temperature sintering and a preparation method thereof, and the copper-containing slurry comprises the following components in percentage by mass: 10-80% of copper powder, 0-80% of silver powder, 0.2-1% of low-softening-point glass powder, 0-3% of high-softening-point glass, 15-20% of an organic carrier and 0.5-3% of an organic auxiliary agent, the low-softening-point glass powder is of a Pb-Te-Li system, the softening temperature ranges from 250 DEG C to 350 DEG C, and the softening temperature is lower than the decomposition temperature of the organic coating agent on the surface of the copper powder. The preparation method comprises the following steps: adding the components according to the ratio, stirring until the components are uniformly dispersed, grinding and sieving to obtain the copper-containing slurry suitable for high-temperature sintering. According to the prepared copper-containing slurry, the low-softening-point glass powder is adopted as a key component, a liquid-phase protection layer is formed in the high-temperature sintering process, oxidation and diffusion of copper are effectively inhibited, and the oxidation resistance and the conductive stability of the copper-containing slurry are improved. Meanwhile, the slurry has good flowability and printing performance, and can meet the requirements of the photovoltaic industry for efficient and low-cost conductive materials.

The invention discloses a silk protein-MXene composite film and a preparation method thereof. The silk protein-MXene composite film sequentially comprises a conductive surface layer, a porous response layer and a supporting bottom layer from top to bottom, the invention relates to the technical field of composite films. According to the fibroin-MXene composite film and the preparation method thereof, a three-layer gradient structure is formed by the conductive surface layer, the porous response layer and the supporting bottom layer, good conductivity and electromagnetic shielding effectiveness are ensured by utilizing oriented arrangement of MXene of the conductive surface layer, gallic acid and MXene form a hydrogen bond network, and nitrogen-doped carbon quantum dots coat the surface of MXene to form a physical barrier, so that the electromagnetic shielding effect is improved, and the electromagnetic shielding effect is improved. Through double oxidation resistance of gallic acid and nitrogen-doped carbon quantum dots, a sponge body structure formed by the porous response layer is matched to endow the composite film with high-sensitivity response to external stimulation, the supporting bottom layer is crosslinked by hexamethylene diisocyanate and enhanced by nanocellulose, the tensile strength is improved, and the tensile strength of the composite film is improved. And the contradiction between the mechanical property and the conductivity of the traditional composite film is effectively solved.

The invention provides high-reflectivity coated glass and a preparation method thereof. The high-reflectivity coated glass comprises a glass substrate, and an antioxidant dielectric layer, a reinforced dielectric layer, a metal layer and an outer dielectric layer which are sequentially arranged on the glass substrate, and the reinforced dielectric layer comprises a first dielectric layer and a second dielectric layer which are arranged in sequence. According to the coated glass provided by the invention, through specific dielectric layer structure combination, the reflectivity of the coated glass is improved, the transmittance is reduced, and the coated glass has good oxidation resistance, scratch resistance and heat-resistant processability, is simple in preparation process and has a wide application prospect.

The invention discloses a high-transparency PVB intermediate film and a production process and application thereof, and relates to the technical field of PVB intermediate films, the high-transparency PVB intermediate film comprises the following raw materials by weight: 100 parts of PVB resin, 20-30 parts of a composite plasticizer, 0.5-0.9 part of an LDH-based composite antioxidant, 0.5-1 part of an ultraviolet light absorber, 0.1-1.5 parts of nano lanthanum hexaboride, 0.1-1.5 parts of porous hollow nano copper sulphide, and 0.1-2 parts of nano TiO2 / SiO2 core-shell particles. The PVB intermediate film provided by the invention is relatively high in light transmittance, low in haze value, and excellent in oxidation resistance, weather resistance and mechanical strength.

The invention belongs to the technical field of thermal power heating surface treatment, and provides a multi-layer composite self-repairing anti-oxidation coating for a boiler heating surface and a preparation method of the multi-layer composite self-repairing anti-oxidation coating aiming at the technical problems that a thermal power boiler heating surface protective coating is insufficient in bonding strength, insufficient in long-term anti-oxidation capacity and concentrated in interface stress among multi-layer structures. Comprising a bonding layer, a gradient transition layer, a self-repairing functional layer and a ceramic surface layer which are sequentially arranged from inside to outside. The self-repairing functional layer is made of NiCoCrAlY alloy, the bonding layer is made of NiCrAlY alloy, the gradient transition layer comprises four layers of gradient transition layer units, each layer of gradient transition layer unit comprises a gradient composite structure of NiCrAlY and nano Al2O3, the self-repairing functional layer comprises NiCoCrAlY serving as a base body, thermal response type microcapsules are embedded in the NiCoCrAlY base body, and the ceramic surface layer comprises a nano ceramic material composed of Cr, Co, Ni, Fe, Al, Ti and B elements.

The present application relates to a protective coating for ultra-high-temperature ceramics based on diborides and a method for producing this coating. The coating is applied as an aluminum oxide mixture, i.e., as a mixture of elemental aluminum and aluminum oxide, and can be applied as a slurry directly onto the diboride-based ceramic materials, preferably zirconium diboride, hafnium diboride, or mixtures thereof, for ultra-high-temperature applications.

The invention discloses high-oxidation-resistance flaky silver-coated copper particles and a preparation method thereof, and relates to the technical field of silver-coated copper powder. The process comprises the steps of flaky copper powder preparation, copper powder pretreatment, silver coating plating and post-treatment. The surface of the copper powder is pretreated, and active sites on the surface of the copper powder are reduced; secondly, a zinc phosphate plated film is formed, full coverage of a silver layer is achieved by adding nano-silver to assist in a silver ammonia solution, meanwhile, micropores of the silver layer are filled, and the compactness of the silver-coated copper powder is improved; besides, the silver content of the silver-coated copper powder is controlled to be 8.7-14.6%, and the normal-temperature oxidation resistance of the silver-coated copper powder is improved, so that the optimal anti-oxidation effect is achieved, and performance deterioration caused by oxidation is reduced.

The invention discloses an anti-oxidation packaging material for hot rolling of thermoelectric materials and a preparation method of the anti-oxidation packaging material, and relates to the technical field of new materials. The packaging material is of a three-layer composite tubular structure and sequentially comprises, from inside to outside, an anti-oxidation barrier layer which is a composite material with an Fe-Al intermetallic compound as a matrix and Y2O3 particles dispersed and distributed; the transition layer is a Ni-Cr-Fe-Mn-C series solid solution alloy with Ni as a matrix; and the structure supporting layer is made of microalloyed low-carbon bainite steel. The layers are metallurgically bonded through hot isostatic pressing, and then the hollow composite pipe is manufactured through cold drawing. The packaging material has excellent high-temperature oxidation resistance, good plastic deformation capacity and structural strength, can effectively isolate oxygen, coordinate strain and maintain overall integrity in the high-temperature hot rolling process, is suitable for protection and densification of Bi2Te3-based, PbTe-based and SiGe-based thermoelectric materials and the like, and remarkably improves thermoelectric performance and production consistency of the thermoelectric materials.

The invention discloses a corrosion-resistant copper alloy pipe. The corrosion-resistant copper alloy pipe comprises the following components in percentage by mass: 0.05-0.40% of P, 0.001-0.1% of X, and the balance of Cu and inevitable impurities, wherein the X is selected from at least one of Al, Ni or RE; in the structure of the copper alloy pipe, the volume fraction of the small-angle grain boundary is 40-65%, and the volume fraction of the large-angle grain boundary is 25-50%. The copper alloy pipe has good corrosion resistance and oxidation resistance, and meanwhile beneficial bending, flaring, welding and pressure resistance are guaranteed. The invention further discloses a preparation method of the copper alloy pipe. The technological process of the preparation method comprises the steps of smelting, casting, face milling, rolling, stretching, rewinding and secondary annealing. Wherein the secondary annealing temperature is 350 to 580 DEG C, and the annealing time is 0.5 to 3.5 hours. The invention further discloses application of the copper alloy pipe and the copper alloy pipe prepared through the preparation method to preparation of a heat conduction pipe of an air conditioner heat exchanger, an air conditioner indoor and outdoor unit connecting pipe or a built-in pipe or a pipe assembly.

The invention relates to the technical field of TPU materials, in particular to a high-wear-resistance anti-oxidation electroplated TPU film and a preparation method thereof.The high-wear-resistance anti-oxidation electroplated TPU film comprises an elastic UV protection layer, a high-wear-resistance anti-oxidation layer, an electroplated layer and a release paper layer which are sequentially arranged from top to bottom; the high-wear-resistant anti-oxidation layer is made of a high-wear-resistant anti-oxidation TPU (Thermoplastic Polyurethane) material, the electroplated layer is made of an aluminum electroplated film layer, and the release paper layer is made of a PET (Polyethylene Terephthalate) release film layer. The high-wear-resistance anti-oxidation electroplating TPU film has the advantages of wear resistance, oxidation resistance, difficulty in delamination, no conductivity and no sparking, is environment-friendly and energy-saving in the preparation process, and can be used for replacing an electroplating film of a traditional electroplating processing technology.

The invention discloses a chromium-doped indium oxide-based high-temperature heat flux sensor and a preparation method thereof, a screen printing technology is adopted, a slurry formula and printing process parameters are optimized, a thermopile structure is accurately formed on a high-temperature-resistant ceramic substrate, and then a thermopile and a thermal resistance layer are subjected to step-by-step high-temperature sintering treatment, so that the chromium-doped indium oxide-based high-temperature heat flux sensor is obtained. And firm combination between the thin film and the substrate and densification of a microstructure are ensured. The finally prepared sensor has excellent high-temperature oxidation resistance and long-term working stability, is stable and reliable in thermoelectric output signal, meets the strict requirements of aerospace, energy power and other fields on high-temperature heat flow measurement, is suitable for heat flow monitoring in high-temperature combustion environments, high-speed pneumatic heating and other scenes, and has wide application prospects. And a reliable test means is provided for design and performance evaluation of the thermal protection system in an extreme environment.

The invention discloses a ceramic component gradient modified C / C-SiC-ZrC composite material and a preparation method thereof, and belongs to the technical field of carbon / carbon composite material matrix modification preparation, a carbon fiber preform and a heating element are placed in chemical liquid phase vaporization deposition equipment, a precursor solution is added until the carbon fiber preform is fully soaked, and a ceramic component gradient modified C / C-SiC-ZrC composite material is obtained; and carrying out chemical liquid phase vaporization deposition reaction to obtain the low-density C / C composite material with porosity in unidirectional gradient distribution. And putting the mixture into a graphite crucible with a carbon-rich area facing downwards and a carbon-less area facing upwards, completely putting the graphite crucible into the ceramic powder for modification, reacting and infiltrating, and cooling to room temperature to obtain the C / C-SiC-ZrC composite material with the gradient modified ceramic components. The end with high ceramic content endows the material with a high-temperature thermal protection function, the end with high pyrolytic carbon content can effectively conduct heat generated in a ceramic-rich area, and the end with low ceramic content can effectively conduct heat generated in a ceramic-rich area. Due to the gradient design from the ceramic-rich area to the carbon-rich area, the material has high-temperature oxidation resistance and ablation resistance and is light, and lightweight design of an aerospace thermal protection structure is facilitated.

The invention discloses a high-wear-resistance additive forming titanium-based composite material and a preparation method thereof. The high-abrasion-resistance additive forming titanium-based composite material is mainly composed of a base body and an amorphous ceramic film, and the high-abrasion-resistance additive forming titanium-based composite material is prepared from, by mass, 97.0%-99.8% of the base body and 0.2%-3% of the amorphous ceramic film. By accurately controlling the thickness and the quality of the amorphous ceramic film, the number and the size of the reinforced phases can be regulated and controlled, and the fluidity and the oxidation resistance of the additive manufacturing titanium alloy powder can be remarkably improved through introduction of the amorphous ceramic film; the in-situ synthesis ceramic reinforced titanium-based composite material prepared through additive manufacturing is free of cracks, high in hardness, good in wear resistance and suitable for being used under harsh working conditions.

The invention discloses a method for reducing impurity element sulfur in cast high-temperature alloy return scraps, and belongs to the technical field of metal material smelting. The method comprises the following steps: carrying out vacuum induction melting on pretreated cast high-temperature alloy return scraps of the same mark to obtain a return scrap alloy induction ingot; surface oxide skin of the obtained return scrap alloy induction ingot is removed, a primary shrinkage cavity in the upper end is cut off, then the return scrap alloy induction ingot and an auxiliary electrode are coaxially welded, and a consumable electrode is obtained; and after the consumable electrode is baked, electroslag remelting is conducted under the protective atmosphere, and an electroslag ingot is obtained. On the basis of vacuum induction melting, the protective atmosphere electroslag remelting technology is further adopted for conducting deep purification melting treatment on the return scrap alloy ingot, the content of the impurity element S in the return scrap alloy ingot can be reduced to 0.5 ppm or below, and the content of the impurity element S in the return scrap alloy ingot reaches the level lower than the content of the element S in a new material; and the high-temperature oxidation resistance and corrosion resistance of the alloy can be obviously improved, and the fatigue, durability and other mechanical properties of the alloy are improved.

The invention discloses a method for improving the oxidation resistance of nickel-based superalloy, and belongs to the technical field of metal material surface modification. Based on the high-energy transient effect of laser shock waves, the method mainly comprises the key steps of alloy surface pretreatment, laser shock peening process implementation, post-treatment and the like. Specifically, firstly, the surface of the nickel-based single crystal alloy is subjected to pretreatment such as polishing and cleaning, surface defects and pollutants are removed, and the treatment quality is guaranteed; then, according to the material characteristics and performance requirements of the nickel-based single crystal alloy, laser parameters such as laser energy, pulse width and light spot diameter are accurately set, and proper restraint layer and absorption layer materials are selected; then, high-energy pulse laser is utilized to irradiate the absorption layer, high-temperature and high-pressure plasma is induced to be generated, the plasma expands and explodes to generate strong shock waves, the shock waves act on the alloy surface, the surface material is subjected to severe plastic deformation, a residual compressive stress layer with the depth capable of reaching hundreds of micrometers is formed, meanwhile, surface grains are refined, and the microstructure is optimized; and after the strengthening treatment is completed, simple cleaning and performance detection post-treatment are carried out. Through laser shock strengthening, a special organization structure with high density and low defect density is formed on the surface of the nickel-based single crystal alloy, diffusion and invasion of oxygen atoms are effectively hindered, and the oxidation resistance of the alloy is remarkably improved. According to the method, the controllability of technological parameters is high, the strengthening effect can be accurately regulated and controlled, the treatment process is free of pollution and high in efficiency, the obtained strengthened nickel-based single crystal alloy can be widely applied to the fields such as aerospace engine hot end parts and nuclear energy equipment which have strict requirements for high-temperature oxidation resistance, the reliability of related parts is greatly improved, and the service life of the related parts is greatly prolonged.

The application discloses an antioxidant coating and a preparation method thereof, and relates to the technical field of coatings. The application first uses hydroxybenzotriazole to esterify and modify acrylic acid, and then uses the modified acrylic acid to prepare modified acrylic resin coating. The benzotriazole structure has high hardness and rigidity, and also has good ultraviolet absorption performance, which can reduce the degradation of the acrylic resin caused by ultraviolet rays and further improve the durability of the coating. The microcapsule wall material is modified by a hydrophobic compound, and then a new type of microcapsule wall material is prepared by coating an antioxidant. The microcapsule wall material modified by the hydrophobic compound can effectively prevent external moisture and oxygen from entering the microcapsule, improve the stability of the coating in a humid environment, and protect the antioxidant in the core material from the influence of the external environment. The antioxidant is slowly and continuously released in the coating, and the oxidation reaction of the coating is effectively inhibited for a long time. The antioxidant coating prepared by the application has the effects of wear resistance and durability.

The invention discloses an anti-oxidation coating and a manufacturing method thereof, and belongs to the field of coatings. The anti-oxidation coating is arranged on the surface of a zirconium alloy matrix, the anti-oxidation coating is a pure Cr coating, the hardness of the anti-oxidation coating is in gradient distribution in the thickness direction, the hardness of a surface layer is larger than that of a bottom layer, and the hardness gt of the bottom layer of the anti-oxidation coating is larger than that of gt; the hardness gt at the 1 / 2 thickness is 4GPa; the hardness of the surface layer is gt; and 6 GPa. Good bonding strength is achieved between the anti-oxidation coating and the zirconium alloy matrix, cracks are not prone to being generated on a bonding interface when the anti-oxidation coating serves in a long-term high-temperature and high-pressure corrosion environment, the service life of the zirconium alloy matrix can be effectively prolonged, and the reliability of the zirconium alloy matrix can be effectively improved.

The invention belongs to the technical field of aero-engine materials, and particularly relates to a high-temperature-resistant aero-engine blade and a preparation method thereof.According to the blade, titanium-aluminum alloy is adopted as a base body, and two novel materials including a core-shell structure self-healing reinforcement phase and a rare earth niobate ferroelastic protection compound are introduced, so that the high-temperature-resistant aero-engine blade is obtained; and the comprehensive performance of the blade in a high-temperature environment is remarkably improved. The core-shell reinforcement phase takes titanium diboride as a core and boron nitride as a shell, and can realize a self-healing function at a high temperature; the rare earth niobate compound has ferroelastic behavior and ultralow thermal conductivity through doping modification of tantalum and rhenium. The preparation process comprises the following steps: mixing the titanium-aluminum alloy powder, the reinforcing phase, the silicon carbide short fibers and the binder, carrying out spark plasma sintering molding, carrying out machining, applying the protective coating through plasma spraying, and finally carrying out heat treatment. According to the method, the process is simplified, and the prepared blade has excellent high-temperature resistance, oxidation resistance and mechanical property and is suitable for aero-engine hot end components.

The invention discloses a forging and rolling combined method for preparing a large-specification super-long titanium alloy thick plate, which comprises the following steps of: S1, reversely deducing the size of a plate blank and the total amount of required raw materials according to the geometric size and working allowance of a target forged plate, designing the weight of a single cast ingot, mixing the raw materials and pressing into an electrode block, a titanium alloy cast ingot is smelted and prepared by adopting a three-time vacuum consumable electric arc smelting process; s2, after a high-temperature anti-oxidation coating is sprayed to the titanium alloy cast ingot, multi-heating-number forging is carried out, the multi-heating-number forging comprises high-temperature cogging forging, single-phase region forging and plate blank forming forging, and a rectangular plate blank is manufactured; s3, the plate blank is heated and subjected to two-phase region one-fire rolling, and a semi-finished thick plate is prepared; s4, after cracks and surface defects of the semi-finished thick plate are removed, the semi-finished thick plate is heated and subjected to two-phase region rolling, and a finished thick plate is manufactured; and S5, the super-long thick plate is sequentially subjected to annealing and surface treatment, and the finished plate is obtained. The method has the advantages that the traditional size limitation is broken through, the forming efficiency is improved, and the structure uniformity and the material performance of the large-specification forged plate are improved.

The invention provides a design method of high-temperature-resistant particles for energy storage of a thermal power plant, and belongs to the technical field of ultrahigh-temperature fluidized energy storage.The design method comprises the steps that a game optimization model is established to determine a basic formula of an energy storage material, and a contribution value jitter increasing and expanding algorithm is adopted to construct a sparse heat conduction matrix; a particle dispersion path optimization algorithm is used for controlling distribution of a hexagonal boron nitride heat conduction enhancer, expanded graphite and carbon fibers are mixed according to the proportion of 3: 1, a silane coupling agent is added for high-temperature composite treatment, a uniform coating layer is formed through an anti-oxidation coating precursor, and the particle size of particles is controlled within the range of 50-200 micrometers through airflow classification. And finally, a surface modifier and a fluidity improver are added to finish surface treatment in a high-temperature fluidized bed, so that the technical problems of material structure failure and heat storage performance degradation caused by thermal stress accumulation in a repeated thermal cycle process of the energy storage particles in a high-temperature environment are solved.

The invention relates to the technical field of industrial production, and discloses an anti-aging corrosion-resistant photovoltaic cable, which comprises an insulating layer, uniformly distributed conductors are arranged on the inner diameter of the insulating layer, an insulating layer is arranged on the outer diameter of the insulating layer, a protective layer is arranged on the outer diameter of the insulating layer, and a sheath layer is arranged on the outer diameter of the protective layer. Reinforcing layers which are uniformly distributed are arranged between the sheath layer and the protective layer, the reinforcing layers are uniformly arranged and spirally wound on the surface of the protective layer, the insulating layer is made of a modified polyolefin material, and the protective layer is formed by blending fluoroplastic and an anti-aging additive. By adopting a multi-layer structure, the antioxidant can capture free radicals generated by thermo-oxidative aging, the 2-hydroxy-4-n-octyloxybenzophenone can absorb ultraviolet rays to reduce photo-oxidative damage, the protective layer contains a hindered amine light stabilizer and can circularly capture the free radicals and regenerate antioxidant groups, and the sheath layer contains polytetrafluoroethylene micro powder and prevents corrosion medium permeation. And the comprehensive effects of aging resistance and corrosion resistance are achieved.

The invention relates to the technical field of modified carbon graphite materials, and particularly discloses an antioxidant modified carbon graphite material and a preparation method thereof, the antioxidant modified carbon graphite material comprises the following raw materials by weight: 30-34 parts of medium temperature pitch, 4-6 parts of modified silica sol and 10-12 parts of artificial graphite powder; from two aspects, firstly, the aluminum dihydrogen phosphate and the boric acid aqueous solution are added, the aluminum dihydrogen phosphate can promote the asphalt to form a denser and firmer glassy carbon structure during carbonization, and phosphorus pentoxide generated by decomposition of the aluminum dihydrogen phosphate and boron oxide generated by dehydration of boric acid can generate a glass phase with an anti-oxidation effect; secondly, core-shell particles are added, a shell layer of the core-shell structure is an aluminum hydroxide structure generated by hydrolyzing aluminum nitrate nonahydrate, and an inner core is epoxidized nano silicon carbide; through the synergistic effect of the two, the mechanical property and the oxidation resistance of the carbon-graphite material are improved.

The invention provides a micron-scale high-melting-point oxide sheet layer enhanced ultra-high-temperature ceramic-based anti-ablation composite coating and a preparation method thereof.The preparation method comprises the steps that ultra-high-temperature carbide / boride ceramic powder, silicide powder and high-melting-point metal oxide powder are mechanically mixed, and spraying mixed powder with uniform components is obtained; the mixed powder is sprayed on the surface of a base body in a plasma spraying mode, and the ultra-high-temperature ceramic-based anti-ablation composite coating containing a micron-scale oxide lamellar structure is obtained; the lamellar high-melting-point oxide phase is introduced into the ultrahigh-temperature ceramic-based composite silicide coating, so that the problem that the silicon-containing glass phase is easy to lose and splash under high-heat-flow scouring is effectively solved. The high-melting-point oxide sheet layer serves as a physical barrier, can effectively limit flowing of a silicon-containing glass liquid phase in the ablation process and allows gaseous oxidation products to escape at the same time, so that a firmly-attached composite oxide layer is formed, and the oxidation resistance and the anti-scouring and anti-stripping capacity of the coating are greatly improved.

The invention discloses a self-healing high-temperature anti-oxidation carbon-ceramic composite material, belongs to the technical field of ceramic-based composite materials, and particularly relates to a method for introducing a self-healing metal-element-free high-temperature anti-oxidation ceramic matrix into a carbon fiber preform. Then introducing a resin carbon matrix and a self-healing inorganic filler through two times of vacuum impregnation and high-temperature cracking, and finally preparing the SiC matrix by adopting high-temperature siliconizing. The carbon-ceramic composite material prepared by the invention does not contain metal impurities, has a self-healing function, and has a long-life anti-oxidation function in a range of 700-1000 DEG C.

The invention discloses a high-toughness coating and a manufacturing method thereof, and belongs to the field of coatings. The high-toughness coating is a pure Cr layer and comprises a matrix layer and modified areas, the average grain size of the matrix layer ranges from 0.1 micrometer to 0.8 micrometer, the average grain size of the modified areas ranges from 1 micrometer to 2 micrometers, the average diameter of the modified areas ranges from 5 micrometers to 15 micrometers, and the interval between every two adjacent modified areas ranges from 0.5 mm to 1.5 mm. The high-toughness coating has good toughness and oxidation resistance, and can effectively prolong the service life and improve the reliability of the zirconium alloy in a high-temperature and high-pressure corrosion environment.

The invention discloses a heat-resistant aluminum alloy material and a preparation method thereof, and relates to the technical field of metal material metallurgy, and the heat-resistant aluminum alloy material comprises the following components in parts by weight: 78-85 parts of pure aluminum ingot; 4-6 parts of electrolytic copper blocks; 1.5 to 2.5 parts of magnesium ingot; 0.8 to 1.5 parts of zinc particles; 2 to 3.5 parts of metal nickel powder; 0.1 to 0.3 part of titanium-aluminum alloy; 0.05 to 0.15 part of a zirconium-aluminum alloy; 0.08 to 0.2 part of scandium aluminum alloy; 0.05 to 0.12 part of a cerium rare earth metal block; according to the aluminum alloy material disclosed by the invention, the high-temperature performance of the aluminum alloy material is remarkably improved by optimizing the composition proportion of the alloy. Elements such as copper and nickel are added to form a stable strengthening phase, so that the high-temperature strength and the creep resistance are enhanced; due to introduction of rare earth elements cerium and scandium, crystal grains are refined, and the thermal stability of the material is improved; and through compound addition of zirconium and titanium, grain boundary migration at high temperature is further inhibited, the softening phenomenon is effectively delayed, and the material still keeps excellent mechanical properties and oxidation resistance in a long-term high-temperature environment.

The invention discloses a preparation technology of Si3N4 ceramic with high thermal shock resistance and oxidation resistance, and belongs to the technical field of high-temperature structural ceramic. The Si3N4 ceramic takes MgO and Yb2O3 as doping agents, the doping amount accounts for 4wt%-16wt% of the mass of a Si3N4 matrix, and the Si3N4 ceramic is prepared through a vacuumizing pressure sintering process. After the ceramic is subjected to air cooling and water quenching thermal shock at the temperature difference of 625-1225 DEG C, the bending strength of the ceramic has an ascending trend, and the bending strength of the ceramic has a slight reduction trend when the temperature difference of water quenching thermal shock is 1425 DEG C. A common sintering furnace is adopted to simulate a high-temperature oxidation environment, the oxidation temperature range is set to be 1000-1400 DEG C, and by analyzing a high-temperature oxidation weight gain curve, the Si3N4 ceramic is low in oxidation rate constant and high in oxidation activation energy, and the oxidized ceramic has stable bending strength, which indicates that the ceramic has excellent oxidation resistance in the high-temperature environment. The problem that the performance of the traditional Si3N4 ceramic is easy to attenuate in high-temperature circulation and oxidation environments is solved, and the Si3N4 ceramic can be widely applied to high-temperature service parts such as high-temperature cutting tools and aero-engine guide blades.

The invention provides high-stability double-layer core-shell coated pure copper silver-substituted conductive paste and a preparation method thereof, and belongs to the technical field of electronic special materials. The copper-resistant coating comprises the following components in percentage by mass: 82%-90% of antioxidant copper powder with a double-layer core-shell structure, 3%-6% of bismuth-boron-zinc lead-free low-melting-point glass powder, 3%-7% of a modified epoxy resin compound organic carrier, 2%-5% of a gradient volatilization compound solvent and 0.5%-2% of a special compound additive for copper. Through the double-layer core-shell copper powder design of inner-layer nano-silver passivation and outer-layer organic composite coating and in cooperation with a liquid-phase synergistic anti-oxidation system, the volume resistivity after slurry curing is smaller than or equal to 3.5 * 10 <-5 > omega.cm, the resistivity change rate after 1000-hour damp-heat aging at 85 DEG C / 85% RH is smaller than or equal to 10%, the normal-temperature storage period without opening a tank is larger than or equal to 6 months, direct curing can be conducted in the conventional air atmosphere of 120-160 DEG C, and the high-temperature-resistant copper paste can be applied to the field of high-temperature storage. The silver paste is completely compatible with production and application production lines of existing silver paste, equipment transformation is not needed, the comprehensive cost is reduced by more than 80% compared with pure silver paste, and the silver paste can be widely applied to the fields of PCBs, membrane switches, flexible electronics, photovoltaic back electrodes, LED packaging and the like.

The invention relates to the technical field of alloy surface treatment, and particularly discloses a treating agent for zinc-aluminum-magnesium alloy surface corrosion prevention and a preparation method thereof.The treating agent for zinc-aluminum-magnesium alloy surface corrosion prevention is composed of a treating agent body component and a treating agent curing component, wherein the treating agent main body component comprises the following raw materials: bisphenol A epoxy resin, antioxidant toughening cellulose, a composite solvent, a flatting agent and a defoaming agent; the curing component of the treating agent comprises the following raw materials: a tackifying curing compound and a composite solvent; when acting on the surface of the zinc-aluminum-magnesium alloy, the treating agent prepared through the method has excellent adhesive force, toughness, oxidation resistance and anti-corrosion effect, the zinc-aluminum-magnesium alloy can be effectively protected, and the service life of the zinc-aluminum-magnesium alloy is long.

The application discloses a method for preparing long-time aging antioxidant high-emissivity alumina-silica double-layer structure coating by a pre-oxidation method, and belongs to the technical field of coating surface modification. The application aims to solve the problems of uncontrollable coating structure and insufficient high-temperature oxidation resistance of existing coatings during long-time high-temperature service. The long-time aging antioxidant high-emissivity double-layer structure coating prepared by the application comprises an aluminum inner layer and a silicon outer layer, and the double-layer structure mainly composed of the inner layer of Al2O3 and the outer layer of SiO2 is formed in situ during the pre-oxidation process. The double-layer structure coating has good bonding performance, the bonding strength reaches above 13 MPa, the emissivity reaches 0.9, the double-layer structure of the inner layer of Al2O3 and the outer layer of SiO2 is maintained after oxidation in static air at 1150 DEG C for 50 h, the coating remains complete without falling-off phenomenon, and the coating has application potential in a long-time aging antioxidant radiation heat protection system of a high-speed aircraft.