232results about How to "No holes" patented technology

The invention belongs to the technical field of materials, and particularly relates to a hybrid fiber reinforced friction material for train braking and a preparation method thereof. In the invention, a composite modified phenolic resin is used as an adhesive, and hybrid fibers, including carbon fiber, metal fiber, inorganic mineral fiber and the like, are used as the reinforcing fibers. Compared with the prior art, the invention improves the contour machining property of the organic synthetic brake, and the yield of the material is high; the brake has stable frictional property at different braking speeds, does not has obvious degradation of frictional property at high speed, and does not have the phenomena of shedding and cracking on the working surface after the braking test. The friction material provided by the invention can be widely used for manufacturing brake pads, brakes, brake shoes and the like in braking systems of passenger and freight trains, municipal rail transportation, subways and the like.

The invention relates to the technical field of PCB (printed circuit board) plating, in particular to a copper plating solution for PCB blind holes, as well as a preparation method and a plating method of the copper plating solution. Each liter of the copper plating solution comprises the following components according to contents: 100-300g of copper sulfate pentahydrate, 50-200g of sulfuric acid, 30-100ppm of chlorine ions, 5-50g of brightener, 3-30g of carrier, 2-20g of leveling agent and the balance of deionized water, wherein the concentration ratio of the copper sulfate pentahydrate to the sulfuric acid is (1.5-2): 1. The plating method comprises the following steps: putting a PCB with blind holes into a plating bath with the copper plating solution; plating during air agitation to obtain a copper plating layer. The copper plating layer formed by the plating method has a hole-filling rate as high as 97% above, and is dense, smooth, voidless, seamless, low in surface sediment thickness, relatively good in malleability, good in gloss, high in toughness and low in internal stress.

The invention discloses an automatic image detection method for motive microorganisms sewage, and belongs to the technical field of image processing. The method of the invention comprises steps of: step 1. capturing a video image of motion microorganisms in sewage ; step 2. creating a multi-layer adaptive codebook model, and performing moving target detection on the captured image according to the codebook model; step 3. performing target contour extraction on the captured image by using an improved five-frame differential algorithm; step 4. merging or calculating a moving target detection result obtained in step 2 and a moving target contour obtained in step 3; and step 5. performing morphological processing and area filling on an obtained image, so as to obtain a moving target detection result. According to the method of the invention, adaptive complex background modeling and a background updating mechanism are designed, background convergence is accelerated, and in combination with the complete and continuous target contour border extracted by using the improved five-frame differential algorithm, sewage microorganism automatic detection accuracy and efficiency are improved, and the experiment results also prove the effectiveness and real-time property of the method.

The invention relates to a resin sand type casting coating and a preparation method thereof, wherein the coating consists of the following components: graphite powder, zircon sand, porzite powder, spodumene powder, sodium bentonite, alkali phenolic resin, silica sol, polyvinyl acetate, carboxymethylcellulose sodium, sodium alkylbenzenesulfonate, fatty alcohol-polyoxyethylene ether and water. The resin sand type casting coating provided by the invention has the advantages of good suspension property, high strength, uniform coating layer and good leveling property. The surface of the dried coating is bright and clean and is free of cavities, bubbles, cracks and the like. After the resin sand type casting coating is used, the cast casting is very high in surface smoothness.

The present invention discloses a titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating; an Al-rich deposition layer, an Al-Cr alloy layer and a Cr diffusion layer are successively arranged from surface to a titanium aluminum alloy substrate. The content of Al in the Al-rich deposition layer remains the same. The content of Al in the Al-Cr alloy layer gradually reduces outside-to-inside to 70%-100% of the content of Al in the titanium aluminum alloy substrate, and the rest in the Al-Cr alloy layer is Cr. The contents of Cr and Al in the Cr diffusion layer respectively gradually reduces outside-to-inside to same as the contents of Cr and Al in the titanium aluminum alloy substrate, and the rest in the Cr diffusion layer is other elements in the titanium aluminum alloy substrate, and the contents of other elements in the Cr diffusion layer respectively gradually rise to same as the contents of the other elements in the titanium aluminum alloy substrate from zero. The invention also discloses a preparation method of the titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating; the titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating can give titanium aluminum alloy excellent oxidation resistance and heat resistance corrosion performance under high temperature and long term service conditions, and due to the presence of the diffusion layer of the gradient components, the reliable binding strength and excellent thermal shock resistance can be realized.

The invention provides a preparation method for a high-purity high-density MAX phase coating. According to the method, an arc ion plating technology is combined with a magnetron sputtering technology,an M-position element is provided for the arc, an A-position Al element is provided for magnetron, nitrogen or hydrocarbon as reaction gas is introduced for deposition, then thermal treatment is adopted, and the high-purity high-density MAX phase coating is prepared. The prepared MAX phase coating is high in purity, good in compactness, free of a microdefect, high in preparation efficiency, low in cost and capable of overcoming the defects that large particles on the surface of a MAX phase coating prepared through a single arc method are excessive, the density is low, the efficiency is low bymeans of a magnetron sputtering method, and the defects are obvious and has the wide application prospects on the aspects of high-temperature protection, corrosion-resistant application and the like,and the industrial production of the MAX phase coating can be achieved easily.

The invention discloses a tungsten nitride based ternary nano composite super-hard film material and a preparation method thereof. The material is a nano composite super-hard film which is covered on a substrate and has a chemical formula of WxM1-xN, wherein in the nano composite super-hard film, W represents tungsten metal, M represents metal replacement, N represents nitrogen, and the value range of the x is 0.06 to 0.72; and the film consists of the tungsten metal, nitride solid solution phase of the M metal and tungsten metal phase or consists of tungsten nitride phase, tungsten metal phase and M metal phase, the grain size of the film is 4 to 30 nanometers, and the thickness of the film is 3 to 7mu m. The method comprises the following steps: firstly, placing a composite target consisting of the tungsten metal and the metal replacement and the substrate on a cathode and in a sample stage in a vacuum chamber of magnetron sputtering equipment respectively; after the vacuum degree of the vacuum chamber is less than or equal to 1*10<-3> pa and the temperature of the substrate reaches 350 and 450 DEG C, making the vacuum chamber in argon-nitrogen mixed atmosphere, sputtering the composite target for 60 to 120 minutes to obtain the tungsten nitride based ternary nano composite super-hard film material. The film material and the preparation method can be widely applied in the fields of mechanical manufacture, automobile and textile industry, geologic drilling, die industry and the like.

The invention relates to a preparation method for a rhenium-iridium combustion chamber. The preparation method comprises the following steps: preparing a rhenium combustion chamber by adopting a powder metallurgy near-net shape forming technology; preparing iridium coatings at inner and outer surfaces of the rhenium combustion chamber by adopting an electric-arc deposition technology; preparing a platinum-rhodium ring by adopting a spinning technology and assembling the platinum-rhodium ring on the inner wall surface of the combustion chamber; and preparing a metal oxide high-radiation coating on the outer surface of the combustion chamber by adopting a plasma spraying technology. According to the preparation method, by virtue of an optimized design of process methods and process conditions at different stages of a preparation process, the prepared rhenium-iridium combustion chamber is applied to an engine, so that a use and working environment of the engine can be remarkably increased, specific impulse can be improved for the engine, and technical support is provided for prolonging flight life of an aircraft, increasing effective load of the aircraft or increasing range of the aircraft.

The invention discloses a manufacture method for a maglev track beam. The manufacture method comprises the following steps: tying a framework of steel reinforcement, manufacturing an internal mold, putting the internal mold in the framework of steel reinforcement, mounting a formwork of track beam, and regulating the formwork of track beam so as to meet the required linearity. The lateral displacement relative to the track beam and the perpendicularity relative to a bottom mold of the side mold of the formwork of track beam can be regulated through a regulating component, and a translating component arranged outside end molds is used for regulating the longitudinal movement relative to the side mold of each end mold. The manufacture method has the advantages of being easy to operate, high in regulating precision and simple to assemble and disassemble the molds. A control component can respectively regulate the transverse displacement, the longitudinal displacement and the vertical displacement of the track beam, the linearity precision can achieve the range of +/-5, and the precast quality of a curved track beam is ensured. The intelligent control can realize high regulating precision, high efficiency and good reliability of a formwork system, and the manufacture method is particularly applicable to precasting of medium-low-speed maglev linear or curved track beams.

A chemical copper plating solution for micropore filling. 1 L of the chemical copper plating solution comprises 5-20 g of copper sulfate pentahydrate, 10-50 g of disodium ethylene diamine tetraacetate, 1.0-1.5 g of formaldehyde or glyoxylic acid, 0.001-0.02 g of mercapto heterocyclic compounds, 0.02-0.04 g of polyether with an average molecular weight of 3650, 1.5-3.5 g of NaOH, and the balance of distilled water; the mercapto heterocyclic compounds are 2-mercapto benzimidazole, 2- mercapto benzoxazole, 1-phenyl-5-mercapto-tetrazole or 2-mercapto benzothiazole. By simultaneously adding mercapto heterocyclic compounds and polyether with an average molecular weight of 3650 into the chemical copper plating solution, the invention realizes no cavity, no gap of micropores, and perfect chemicalcopper filling; the chemical copper plating solution is stable; and the deposited copper film has good quality.

The invention discloses a graphene-silicon dioxide composite wall-material phase-change nanocapsule and a preparation method thereof. A core material of the phase-change nanocapsule is a paraffin phase-change material, a wall material of the phase-change nanocapsule is a graphene-silicon dioxide composite material, and the particle size of the nanocapsule is nanometer scale. The preparation methodcomprises the following steps: mixing the phase-change material with an alkoxy silane compound so as to obtain an oil phase, adding a cationic surfactant and a water/ethanol mixed solvent, and carrying out high-speed shearing and ultrasonic refining so as to obtain an oil-in-water type fine emulsion; dispersing graphene into deionized water under the assistance of an anionic surfactant so as to form stable graphene dispersion liquid; and dropwise adding the graphene dispersion liquid into the fine emulsion, sequentially adding ethanol and a basic catalyst, heating to react, filtering, washing, and drying, so as to obtain a black powder product. The wall material of the phase-change nanocapsule is the graphene-silicon dioxide composite material, so that a supercooling phenomenon of the phase-change nanocapsule can be eliminated, and meanwhile, the heat conductivity coefficient and heat stability of the phase-change nanocapsule can be increased.

The invention discloses a high alloy matrix metal-ceramic composite and a preparation method thereof, and belongs to the field of wear-resistant materials. According to the high alloy matrix metal-ceramic composite, the volume ratio of high alloy matrix materials to metal-ceramic reinforced particles is (1-10):1; the high alloy matrix materials comprise 1-8% of C, main alloying elements, minor additive elements and the balance Fe and unavoidable impurities; the main alloying elements comprise 0-60%of Ni, 0-60% of Mo, 0-40% of Cr, 0-30% of Mn, 0-20% of V, 0-20% of Ti, 0-15% of W and 0-15% of Nb; and the minor additive elements are one or more of B, Si, Zr, Cu, Co, Al and rare earth. The preparation method adopts a programmed temperature-controlled liquid phase sintering method for preparation and can be used directly for wear-resisting materials, or for wear-resisting materials after subsequent heat treatment; and the metallurgical bonding interface between the reinforced phase and thehigh alloy matrix in the composite reaches 40[mu]m-1mm, no cracks occurs after the integral heat treatment, and the service conditions in the wear-resistant material field are met.

The invention discloses a coating for lost foam casting cast iron and production process thereof, belonging to the technical field of the metal material processing and metallurgy. Quartz powder, graphite powder (lead powder), crystalline flake graphite powder, lithium base bentonite, phenolic resin, carboxymethylcellulose, milk-white glue and n-octyl alcohol are taken according to predetermined proportions; next, hot water in a predetermined proportion is taken and then all the materials are blanked and stirred thereto in a predetermined order, thereby obtaining the usable coating. The coating has excellent thixotropism; the coating has no foam or little foam which disappears quickly in the process of stirring and use; and the coating may not craze after being dried.

The invention discloses an yttrium barium copper oxide superconducting thin film mixed with samarium. Chemical composition of the superconducting thin film is YSmxBa2-xCu3Oy, wherein 0

The invention provides a process method for reducing floating gate holes. The process method at least comprises the following steps: at first, a liner oxide layer and a silicon nitride layer are deposited successively on an active region of a semiconductor substrate; secondly, the liner oxide layer, the silicon nitride layer and the active region are etched to form at least two inverted trapezoidal trenches, wherein the trenches do not penetrate through the active region; then, the trenches are filled with an insulating medium material to form shallow trench isolation regions; then, the selective etching process is adopted to etch the silicon nitride layer located between the shallow trench isolation regions, and at the same time, partial shallow trench isolation regions are etched to acquire a rectangular or inverted trapezoidal floating gate preparation region; and finally, a floating gate is prepared and formed in the floating gate preparation prepare. Thus, no hole will occur in the floating gate prepared and formed in the rectangular or inverted trapezoidal floating gate preparation region to avoid the floating gate from being failed, so the device reliability can be enhanced.

The invention provides an inert multilevel-structure tungsten-aluminum composite material and a preparation method thereof. The inert multilevel-structure tungsten-aluminum composite material comprises a multilevel-structure tungsten-aluminum composite material and a compact and even tungsten-aluminum metallic compound protecting layer WAl12 or Wal5. The specific preparation method comprises steps as follows: tungsten powder and aluminum powder are mixed and then subjected to ball milling, and aluminum coated tungsten particle cluster composite powder is obtained; the aluminum coated tungsten particle cluster composite powder is mixed with the aluminum powder, a mixture is placed in an aluminum sheath and subjected to compacting, vacuum heating degasification, sealing and hot-isostatic-pressure sintering, the aluminum sheath on the surface is removed, and the multilevel-structure tungsten-aluminum composite material is obtained; the multilevel-structure tungsten-aluminum composite material is put in a high-frequency induction heating furnace, vacuum pumping is performed or inert gas is introduced into the furnace for induction heating, the protecting layer is formed on the surface of the multilevel-structure tungsten-aluminum composite material, and then the inert multilevel-structure tungsten-aluminum composite material is obtained. The inert multilevel-structure tungsten-aluminum composite material prepared with the method is light and high in strength, is provided with the inert protecting layer on the surface, and has good wear resistance and corrosion resistance.

The invention discloses an electronic beam added material manufacturing method of molybdenum base alloy powder. The particle size of the used molybdenum base alloy powder is 55-85 microns; and when powder layers are scanned by electronic beams, a twice scanning mode is adopted. The molybdenum base alloy electronic beam added material manufacturing process finds out manufacturing process parametersof added materials with the highest compactness, and adopts the twice scanning mode to solve the nodulizing and powder splashing problems in the manufacturing of the electronic beam added materials to improve the compactness of components to the casting level.

The invention discloses a metal surface silane treating agent containing aqueous nano-zinc oxide. The metal surface silane treating agent is characterized by being a mixture solution prepared from the following ingredients in parts by weight (gram) in each liter of the mixture: 20-30 parts of propyl trimethoxy silane, 30-40 parts of aminopropyl triethoxy silane, 100-200 parts of aqueous nano-zinc oxide, 2-4 parts of propylene glycol, 2-4 parts of zirconium fluoride, 1-2 parts of ethylene glycol monobutyl ether, 0.8-1 parts of sodium monofluorophosphate, 2-3 parts of ethylene diamine tetramethylene risedremate sodium, 1-2 parts of urea, 0.6-0.8 parts of crylic acid, 0.4-0.6 parts of carboxymethyl cellulose and the balance of water. The metal surface silane treating agent has the advantages that a silane coating layer formed on the surface of a metal after the metal is treated by using the surface silane treating agent provided by the invention has excellent corrosion resistance performance, the service life of the metal is prolonged, and by combining the propyl trimethoxy silane and the aminopropyl triethoxy silane, a compact and solid coating layer is formed on the surface of the metal.

The invention discloses a processing technology of a zinc-nickel plating alloy. The processing technology comprises the following steps: S1, pretreatment; S2, surface oil removal; S3, cleaning; S4, etching and activation; S5, plating; S6, passivation treatment; S7, surface treatment; and S8, inspection. During actual use, a zinc-nickel alloy coating layer is plated on the surface of a workpiece; the high-strength bonding force with a workpiece can be realized; the zinc-nickel plating alloy plating layer is fine in appearance, free of pinholes and free of blistering; the attractiveness of the workpiece is further improved; meanwhile, after the workpiece plating is finished, the surface is treated by a treatment liquid; the surface of the workpiece can be further protected, so that the workpiece has good thermal stability, corrosion resistance and oxidation resistance, the surface of the workpiece soaked in the treatment liquid is smooth and complete, and holes and redundant parts are avoided; the process is easy to operate, and the corrosion resistance of the plating layer is still superior to that of a pure zinc plating layer after the plating layer is processed.

A high-temperature self-lubricating and wear-resistant powder coating, the raw materials of which are composed of 20-30% of nickel powder, 50-60% of titanium carbide powder or titanium nitride powder, and 10-20% of silver powder according to mass percentage. Use the powder coating of the present invention to spray on the metal substrate after sandblasting and roughening according to the process parameters of laser cladding in the prior art. The material is metallurgically combined and has high bonding strength. The hardness HV is ≥ 1500. The high-temperature self-lubricating wear-resistant coating has excellent anti-friction and wear-resisting properties. The high-temperature friction test temperature is 400-450°C, and its friction coefficient is 0.20- 0.30, with good wear resistance.

The invention provides an ytterbium-doped strontium cerate-alkali metal salt co-melt compound. The ytterbium-doped strontium cerate in the compound is prepared by a solid phase method, a microemulsionmethod or a sol-gel method, and then is composited with the alkali metal salt co-melt at the temperature of 750 DEG C to obtain the compound having good electrochemistry performance, and the operating temperature of a solid fuel cell using the ytterbium-doped strontium cerate as an electrolyte is greatly reduced.

The invention discloses anti-cracking, wear-resistant and seepage-proof compound mortar. The anti-cracking, wear-resistant and seepage-proof compound mortar is prepared from raw materials in parts by weight as follows: 20-30 parts of long and short reinforcing fiber, 15-20 parts of a waterproof additive, 10-20 parts of gelatine powder, 10-16 parts of a composite aid, 10-14 parts of glass beads, 65-75 parts of Portland cement, 55-65 parts of fine sand, 35-45 parts of composite filling sand, 1-2 parts of triethanolamine and 1-3 parts of sodium tripolyphosphate. The compound mortar has excellent anti-cracking, wear-resistant and efflorescence preventing properties and has better water resistance, seepage-proof property and adhesion force, relatively excellent impact resistance and thermal insulation and sound insulation effects and a certain pollutant air absorption function; besides, according to the provided preparation method, the material cost is lower, raw materials are easy to obtain, the process is simple, and the compound mortar has higher practical value and excellent application prospects.

The invention discloses a flame-retardant coating fabric high in moisture-penetrability. The flame-retardant coating fabric high in moisture-penetrability comprises a first base coating and a second base coating, wherein the first base coating is obtained by drying a sizing agent which is prepared from the following components in parts by mass: 100 parts of polyurethane resin, 38-42 parts of bromoethane, 19-21 parts of diantimony trioxide, 4.5-5.5 parts of zinc borate, 4-5 parts of a bridging agent, 1.6-2 parts of an accelerant, 1.4-1.6 parts of a washable agent and 9-11 parts of phosphate ester flame-retardant oil. The second base coating is obtained by drying a sizing agent which is prepared from the following components in parts by mass: 100 parts of polyurethane resin, 38-42 parts of bromoethane, 19-21 parts of diantimony trioxide, 4.5-5.5 parts of zinc borate, 4-5 parts of the bridging agent, 1.6-2 parts of the accelerant, 1.4-1.6 parts of the washable agent and 9-11 parts of phosphate ester flame-retardant oil. The flame-retardant coating fabric high in moisture-penetrability is small in smoke generation quantity, free of molten drop, high in flame-retardant effect and highly washable; the flame-retardant substance has a small possibility of hydrolyzing.