77results about How to "Improve high temperature thermal stability" patented technology

The invention relates to the field of internal combustion engine tail gas treatment, in particular to a ternary catalyst for purifying the tail gas of an internal combustion engine and a preparation method thereof. The preparation method is characterized in that cordierite ceramic honeycomb is used as a carrier, precious metals such as platinum, palladium and rhodium are adopted as active components, the bottom layer catalyst contains the palladium active component with the active component concentration of 0.1 to 6g/L, the content of cerium of a cerium-containing oxygen storage material is 15-30 percent by weight, the top catalyst contains palladium and/or rhodium active component with the concentration of 0.01 to 0.6g/L, the content of cerium of the cerium-containing oxygen storage material is 40 to 80 percent by weight, a heat-resisting oxide is aluminum oxide consisting of gamma-aluminum oxide or theta-aluminum oxide, the aluminum oxide is stabilized by 3 to 8 percent by weight of lanthanum, the specific surface area is 120 to 300 m<2>/g, the weight ratio of the aluminum oxide to cerium-containing oxygen storage material to additive is 100: (40-80): (11-30). By adopting the catalyst based on the technical scheme, the conversion efficiency of the pollutants in tail gas of the internal combustion engine is high, the ignition temperature is lower, and the thermal stability in high temperature is high.

The invention relates to a synthesis technique of a high-grade self-sharpening polycrystalline diamond, which comprises the following steps: metering and mixing the raw materials for synthesizing the diamond according to percentage by mass, granulating, and pressing into a synthetic stick; putting the synthetic stick into a synthesis block, and drying in a vacuum drying oven at constant temperature for later use, wherein the synthesis block is synthesized at high temperature under superhigh pressure with a cubic press; and taking out the synthetic stick, carrying out after-treatment to obtain a self-sharpening polycrystalline diamond, carrying out in-situ polymerization by a sol-gel process, and applying a zirconia coating on the diamond surface to form the high-grade self-sharpening polycrystalline diamond. The product has the advantages of favorable impact toughness, favorable thermal stability and favorable comprehensive properties, can obviously enhance the holding force of the self-sharpening polycrystalline diamond in a grinding tool, can keep the self-sharpness in the grinding process, and finally, is beneficial to prolonging the service life of th grinding tool and enhancing the machining efficiency of the grinding tool.

The invention provides a catalyst for catalyzing methane combustion and a preparation method thereof. The catalyst comprises a carrier, and an active component which is loaded on the carrier, wherein the active component is wrapped with a wrapping layer for providing oxygen vacancy. The catalyst further comprises a catalyst promotor which is a ceria-zirconia solid solution. According to the catalyst, the wrapping layer wraps the active component, so that oxygen molecule stored in the wrapping layer can be timely conveyed to the active component, so that the high-temperature stability of the active component of the catalyst is maintained; in addition, the catalyst further comprises the catalyst promotor which is the ceria-zirconia solid solution capable of generating more oxygen vacancies and timely effectively storing and discharging oxygen, so that the high-temperature stability of the active component of the catalyst is improved; in addition, the wrapping layer, the ceria-zirconia solid solution and the carrier are mutually dispersed and in contact, so that the mutual insulation effect is achieved, and the sintering of the carrier is inhibited, and as a result, the high-temperature thermal stability and the catalyzing activity of the catalyst can be improved.

The invention discloses a polylactic acid/starch expansion flame-resistant composite material with excellent flame resistance, and a preparation method thereof. The polylactic acid/starch expansion flame-resistant composite material is composed of, by weight, 60 to 89% of polylactic acid, 5 to 30% of an acid source, 5 to 30% of a modified starch, and 1 to 15% of a gas source. In a preferred embodiment, the modified starch is phosphorized maleic anhydride grafting modified starch (bio-based phosphorus containing starch). According to the preparation method, polylactic acid possesses excellent compatibility with the modified starch; synergistic effect of the acid source, the carbon source (the modified starch), and the gas source is capable of improving charring forming capability of the polylactic acid matrix, and improving high temperature stability and flame resistance of polylactic acid greatly. According to the preparation method, adoption of an existing double-screw extruder is enough for production; preparation is simple and convenient; and the preparation method is convenient for industrial production.

The invention discloses a method for preparing colored polyester fibers through stock solution coloring. The method comprises steps as follows: organic pigments are added to liquid-state dispersion media containing a stabilizer and sufficiently dispersed, and uniformly dispersed colored slurry is obtained; the colored slurry is added to polyester oligomer, the mixture is uniformly mixed for prepolymerization and final polycondensation reactions, polyester melts are obtained and subjected to direct spinning through a spinning manifold, and the colored polyester fibers are prepared; or colored polyester chips are firstly prepared, single-color polyester chips or various polyester chips with different colors are mixed and then subjected to indirect spinning according to demands, and the colored polyester fibers with the required color are prepared. The prepared colored slurry is stable at the normal temperature and has good compatibility with polyester; the pigments are uniformly dispersed in a polymerization system; after spinning and forming of the melts, a coloring agent is fixed in the fibers, and the color fastness of the product is high; different batches of the colored polyester fibers or the same batch of the colored polyester fibers basically don't have color difference, and the method is particularly suitable for large-scale continuous production.

The invention relates to a porous inorganic coating/polyolefin microporous membrane compound diaphragm and a preparation method thereof. The preparation method provided by the invention comprises the following steps of: carrying out plasma surface pre-treatment on a polyolefin microporous membrane, so that multiple polar groups are connected to the surface of the polyolefin microporous membrane; coating the polyolefin microporous membrane subjected to the plasma surface pre-treatment by adopting an inorganic coating masking liquid to form a porous inorganic coating; and curing the inorganic coating. The compound diaphragm provided by the invention still has the characteristics and thermal closing function of a lithium ion transport channel as well as basic performances such as air permeability, ionic conductivity, acupuncture strength and tensile strength required by a lithium ion battery diaphragm, and high temperature thermal stability of the compound diaphragm is obviously improved.

The invention relates to iron-tungsten-titanium composite oxide catalyst. The catalyst has the chemical composition of FeWaTiOx, wherein a is greater than 0 and less than or equal to 1.6. The invention further discloses a preparation method of the catalyst, which comprises the following steps: (1), preparing the solutions of Fe source, W source and Ti source in the presence of oxalic acid, and mixing the solutions of Fe source, W source and Ti source to obtain a mixed solution; and (2), adding excessive urea precipitation agent into the mixed solution to ensure that ions can be fully deposited, and carrying out suction filtration, washing, drying and baking to obtained sedimentation products to obtain the iron-tungsten-titanium composite oxide catalyst. Compared with iron-tungsten-titanium composite oxide catalyst without adulteration, the iron-tungsten-titanium composite oxide NH3-SCR catalyst has an obviously improved high-temperature thermal stability, and is easier to apply to catalysis and decontamination of NOx in heavy duty diesel exhaust.

The invention relates to a compounded high-viscosity high-elasticity asphalt material and a preparation method therefor. The asphalt material is prepared from the following ingredients in parts by weight: 5-25 parts of waste tire rubber granules, 2-8 parts of styrene-butadiene-styrene block copolymer, 0-8 (but 0 is exclusive) parts of blend oil, 0-1 (but 0 is exclusive) part of plasticizer, 0.1-0.5 part of composite stabilizer and 57-93 parts of matrix asphalt. Compared with the prior art, the asphalt material prepared by the method has the advantages that the kinetic viscosity at the temperature of 60 DEG C is not smaller than 20,000Pa.s, the recovery of elasticity at the temperature of 25 DEG C is not smaller than 90%, the storage stability at the temperature of 180 DEG C is not greaterthan 4.0 DEG C, the asphalt material has good mechanical properties and storage stability, the high-temperature rut resistance of pervious asphalt concrete can be improved, the low-temperature frost heave resistance of the pervious asphalt concrete can also be improved, the durability of the pervious asphalt concrete is remarkably improved, and the service life of the pervious concrete is prolonged.

The invention discloses a cable scarfskin which comprises the following materials in parts by weigh: ethylene-vinyl-acetate copolymer, magnesium hydroxide, aluminum hydroxide, maleic anhydride grafted ethylene- vinyl-acetate copolymer, maleic anhydride grafted polyethylene, silicone, silane, fillers, antioxygen 1010, zinc oxide, ferric oxide, epoxidized soybean oil, toner and polyethylene. The cable scarfskin has the characteristics of good flexibility, high impact resistance, high environmental stress resistance, and the like, by compounding EVA and PE. A flaw which can cause crack can not appear. Meanwhile, in order to overcome the defects of flammability, a plurality of auxiliaries, such as aluminum hydroxide and magnesium hydroxide, are added, thereby improving the fire resistance of the cable scarfskin. Materials comprising halide are not added, which makes the cable scarfskin have no halogen. The fillers are added to make the heat stability of the cable scarfskin good. The cable scarfskin can be used at 105 DEG C.

The invention relates to a composite micro-nanometer zirconia-based high temperature abradable sealed coating material and a preparation method thereof, and the material is made by compositing a base-phase component A, a base-phase component B, a bonding component, a solid lubrication component and a poring component, wherein the content of each component, based on weight percentage, are as following: 60-70 wt% of base-phase component A, 15-20 wt% of base-phase component B, 5-15 wt% of bonding component, 1-3 wt% of solid lubrication component and 5-8 wt% of poring component; the coating material is obtained through fixing, spraying granulation and screening the components. The coating prepared by the invention has high deposition efficiency, strong high-temperature thermal stability, appropriate coating thickness and hardness, good abrasivity and bonding strength etc.

The invention relates to a non-loaded type deep-hydrogenation catalyst and a preparation method thereof, and belongs to the field of catalyst preparation. The catalyst takes Ni and Mo as main active components and one or more of Zr, Zn, Al and Fe as an auxiliary active component; through BET-method determination, the catalyst has a mesoporous structure, and has the mesoporous diameter of 5.0-7.0 nm and the specific surface area of 100-300 m<2>/g. With combination of characteristics of simple operation of a precipitation method and catalyst thermal stability improvement of a hydrothermal synthesis method, the defects of long period, low metal utilization rate and high cost are overcome, the obtained catalyst not only has more metal active sites, but also has the hydrothermal stability improved. In the preparation process of the catalyst, no other binders are used, the preparation process is simplified, and the cost of the catalyst is reduced.

The invention discloses an aluminum alloy drill rod composite material with solid self-lubrication and a preparation method. The composite material consists of two parts: a substrate and a precursor,wherein the substrate comprises the following components in percentage by mass: 3.8-4.9% of Cu, 1.2-1.8% of Mg, 0.30-0.90% of Mn, and the balance of Al. The precursor is 20-30% of the substrate by mass; and the precursor is formed by a high-entropy alloy Ti2CoCrFeNiCu coating MoS2+C particles. The preparation method comprises the following steps: the precursor is prepared; the raw materials of thesubstrate are prepared; then, the precursor is injected in a solid particle fluidizing conveyor of spraying deposition equipment; finally, the raw materials of the substrate are molten by a cruciblesmelting furnace for flowing to a metal liquid pocket; and metal liquid and the precursor are synchronously atomized to form a solid-liquid atomization mixture for deposition to obtain a wear-resistance composite material casting blank with self-lubrication for extrusion molding.

The invention provides an electrolyte and a secondary battery. The electrolyte comprises an electrolyte salt, an organic solvent and an additive. The additive comprises a cyclotriphosphazene compoundand vinyl ethylene carbonate. When the electrolyte is applied to a secondary battery, the normal temperature cycle performance, high temperature storage performance and high temperature thermal stability of the secondary battery can be improved simultaneously.

The invention relates to a high-temperature liquid-state nitrate purification and performance enhancement fusing tank. A filtering plate (4) is horizontally arranged inside a tank body (2), a hollow stirring rod (16) is arranged in the middle of the top of the tank body (2) towards the tank body (2), the lower end of the hollow stirring rod (16) is positioned on the upper side of the filtering plate (4), a stirring paddle (3) is arranged on the lower end of the hollow stirring rod (16), the lower end of the hollow stirring rod (16) is connected with a bubbler (5) which downwards penetrates through the filtering plate (4). Dry air, carbon dioxide and nitrogen gas are sequentially fed, the stirring paddle (3) is used for stirring while the bubbler (5) conducts gas introduction, and through the coordinated and reasonable structure arrangement of the stirring paddle and the bubbler and by bubbling, stirring, filtering, additive addition and the like under the high-temperature melting state, the purification function of high nitrate can be realized, the impurity removal and purification rate of the fused salt is up to 97%, the high-temperature thermal stability of nitrate can be enhanced, and the corrosivity of nitrate can be reduced. The stirring and homogenization time is short, and the high-temperature liquid-state nitrate purification and performance enhancement fusing tank is energy-saving, environment-friendly, safe and high in efficiency.

The invention relates to a method for preparing steel-making furnace burden from blast furnace gas dust zinc-extraction kiln slag. The method comprises the following steps: a, flushing and pelletizing: flushing, flaming out and pelletizing after blast furnace gas dust zinc-extraction rotary kiln hot slag drops from a kiln head, and sinking the slag to the bottom of a slag bath; b, dehydrating anddrying in air: transferring out the pelletized kiln slag cooled on the bottom of the slag bath, and naturally drying the slag after the slag is dehydrated, thereby obtaining the pelletized rotary kilnslag; c, material dry-mixing: weighing the pelletized rotary kiln slag, mineral powder and desulfurized gypsum in a mass ratio being (400-650) to (16-26) to (2-6), and uniformly mixing; d, material wet-mixing: adding water into the uniformly mixed material of the pelletized rotary kiln slag, the mineral powder and the desulfurized gypsum to uniformly mix; and e, pressing and forming, and curing and drying in air: naturally curing after de-moulding, thereby obtaining a rotary kiln slag pressed product, namely steel-making furnace burden. The method can realize cyclic utilization of the blast furnace gas dust zinc-extraction kiln slag, avoids the problems of high energy consumption and secondary pollution of a ball-milling and magnetic-separating process, improves recovery efficiency, and also reduces converter steel-making cost.

The invention discloses a Mo-doped AlCrSiN/Mo self-lubricating film and a preparation method of the Mo-doped AlCrSiN/Mo self-lubricating film, and belongs to the technical field of films and preparation of the films. The AlCrSiN/Mo self-lubricating film is formed by doping Mo elements into a AlCrSiN film, the doping amount of the Mo elements is 0.3-6.3at.%, and the film is prepared on a substrateby adopting a high-power pulse magnetron sputtering technology and a pulse direct current magnetic control coating technology. The prepared AlCrSiN/Mo self-lubricating film is high in hardness, good in toughness, excellent in wear reduction property and capable of remarkably reducing friction between a cutter and chip, and has good chemical stability and easy-to-shear lubricating property.

The invention belongs to the field of surface protective coating materials, and discloses a multicomponent nitride hard coating, a preparation method of the multicomponent nitride hard coating and application of the multicomponent nitride hard coating. The multicomponent nitride hard coating comprises a (TiAlCrTaW) N layer, wherein the (TiAlCrTaW) N layer in a columnar crystal growth structure; and the chemical formula of the (TiAlCrTaW) N layer is (TiaAlbCrcTadWe)N, wherein the summary of a, b, c, d and e is equal to 1, either a or b is greater than or equal to 0.2 but less than or equal to 0.5, and c, d or e is greater than or equal to 0 but less than or equal to 0.2. The multicomponent nitride hard coating has the advantages that the multicomponent nitride hard coating has the properties of excellent high-temperature structure, mechanical stability, inoxidizability and wear resistance; the multicomponent nitride hard coating has a harness number of 30-40 Gpa, and an elasticity modulus of 400-500 Gpa in a deposition state; and the multicomponent nitride hard coating has a harness number of 35-45 GPa and a elasticity modulus of 450-550 GPa under the temperature of 900 DEG C.

The invention relates to a positive electrode electrolyte with a silicon-containing heteropolyacid additive for an all-vanadium redox flow battery. The silicon-containing heteropolyacid additive is one or two kinds of silicotungstic acid, silicomolybdic acid, silicon niobic acid or silicon tantalic acid; and the concentration of the silicon-containing heteropolyacid as the additive is 0.01-0.5mol/L. By taking the silicon-containing heteropolyacid as the positive electrode electrolyte additive, the problem of capacity fading in the operation of the battery at a high temperature can be effectively suppressed, and the stable operation of the battery can be realized; and in addition, the positive electrode electrolyte is simple in preparation process, energy-saving and environment-friendly, low in cost, and capable of realizing stable operation of the electrolyte in the battery.

The invention discloses a preparation method of an automobile bearing material.The bearing material is prepared from, by mass, chromium 24.5%-26%, yttrium 6.5%-8%, titanium 52%-56%, bismuth 7.5%-12% and the balance tungsten.

The invention discloses a method for promoting high temperature heat stability of a thermoplastic polymer or compound thereof by utilizing inorganic and alkyl metallic phosphites. The compound of inorganic metallic phosphite and alkyl metallic phosphite is added into the raw materials; the addition of the compound is 0.1-2%, on the basis of the total weight of the thermoplastic polymer or compoundthereof; the weight ratio of inorganic metallic phosphite to alkyl metallic phosphite is at 1:(1-10); the structural formula of alkyl metallic phosphite is shown by formula (I) or (II); R is selectedfrom straight chain fat alkyl with 1-6 aryl groups or carbons and Me is selected from zinc, calcium or magnesium. According to the method disclosed by the invention, under the combined action of hightemperature and shearing force, the thermoplastic polymer or compound thereof is capable of avoiding the problems of cross-linking, decomposition, degradation, discoloration, and the like, and can maintain various properties of the materials.

The invention relates to a lithium ion battery diaphragm prepared from an inorganic-organic composite material. The lithium ion battery diaphragm comprises at least two layers of polyolefin-based porous membranes which are stacked in sequence, and two adjacent layers of polyolefin-based porous membranes are bonded and fixed through an inorganic-organic composite material liquid; wherein the inorganic-organic composite material liquid is prepared from the following components in parts by weight: 30 to 50 parts of polyolefin emulsion, 5 to 10 parts of adhesive, 3 to 8 parts of nanoscale modifiedcomposite fiber, 0.2 to 0.5 part of dispersing agent and 0.1 to 0.5 part of plasticizer. The prepared lithium ion battery diaphragm is relatively stable in performance, is particularly applied to a lithium ion battery for an electric vehicle, and can tolerate relatively high temperature in the working process of the electric vehicle, and the diaphragm shrinkage rate is remarkably reduced comparedwith that of an existing polyolefin-based diaphragm, so that the overall service life of the battery is remarkably prolonged, and the safety is greatly improved; and the use convenience, the safety and the stability of the electric product are also improved.

The invention discloses a high-temperature-resistant solar energy selective absorbing coating with surface textured metal Mo being an absorbing layer and belongs to the technical field of solar energy utilization. According to the coating, the absorbing layer and an antireflection layer are sequentially formed on a stainless steel substrate, wherein the absorbing layer is composed of a surface textured metal Mo film, the thickness is 40 nm-100 nm, and the roughness value is 0.5 nm-3 nm; the antireflection layer is composed of a ceramic Al2O3 or SiO2 film, and the thickness is 50 nm-150 nm. The solar energy selective absorbing coating has a visible-infrared spectrum high absorbing rate, a low infrared spectrum emission rate and good high-temperature thermal stability; the coating is simple in structure, stable in preparation technology, convenient to operate, low in production cost and short in production period; meanwhile, with the surface textured metal Mo coating being the absorbing layer, using and doping of an infrared reflection layer are effectively avoided, and the application range of low-heat emission metal on the solar energy absorbing coating is widened.