252results about How to "No crack" patented technology

The invention belongs to the technical field of titanium alloy materials and additive manufacturing, and relates to a high-performance titanium-based composite material based on additive manufacturing and a preparation method of the high-performance titanium-based composite material. The preparation method comprises the following steps that titanium alloy powder subjected to vacuum drying treatment and titanium-coated reinforced phase nanoparticles are added into a ball mill to be subjected to ball milling treatment in the inert gas atmosphere, and evenly-mixed composite powder is obtained; and after the composite powder in the first step is subjected to vacuum drying, the composite powder is evenly laid on a forming base plate through additive manufacturing equipment, the composite powder is molten layer by layer through a heat source, and the high-performance titanium-based composite material is obtained after solidification. According to the titanium-based composite material and the preparation method thereof, TiB generated by the in-situ reaction of the B element in the titanium-coated reinforced phase nanoparticles and the Ti element in selective laser melting forming is adopted, the TiB is uniformly dispersed and distributed in a titanium alloy matrix, the prepared titanium-based composite material has good density, the strength, hardness and other properties of the material are obviously improved, and the comprehensive mechanical property is excellent.

The invention discloses ultralow-temperature high manganese steel and a manufacturing method of an ultralow-temperature high manganese steel plate. The ultralow-temperature high manganese steel comprises the following components in percentage by weight: 0.35-0.55% of C, 0.01-0.10% of Si, 20.00-30.00% of Mn, 0.01-0.10% of Al, less than or equal to 0.005% of P, less than or equal to 0.003% of S, 3.0-5.0% of Cr, 0.3-1.0% of Cu, 0.2-1.20% of Ni, less than or equal to 0.008% of N, less than or equal to 0.002% of O, less than or equal to 0.0002% of H and the balance of Fe and inevitable impurity elements. The manufacturing method of the ultralow-temperature high manganese steel plate comprises the steps of molten iron pretreatment, K-OBM-S converter smelting, LF refining, continuous casting, annealing and coping, hot rolling, online solution treatment and the like. According to the method, high steel purity, low phosphorus and sulfur content, small segregation of the casting blank and the steel plate, good macrostructure of the casting blank and no crack on the surface and in the casting blank can be guaranteed, and the finished steel plate has the characteristics of low yield ratio, high tensile strength, high ultralow-temperature toughness, small thermal expansion coefficient, good fatigue resistance and the like; through the implementation of the invention, the manufacturing cost of the steel for the liquefied natural gas storage tank can be reduced to 1 / 3 of that of 9% Ni steel in the prior art.

The invention relates to the technical field of polyester resin, and discloses a preparation method and application of super-weather-resistant HAA curing type extinction polyester resin, neopentyl glycol, a triazine phenyl imide diol monomer, binary acid, an esterification catalyst, an onium salt curing accelerator and the like are subjected to a reaction, and the super-weather-resistant HAA curing type extinction polyester resin is obtained. The triazine phenyl imide diol monomer has a phenyl imide ring and triazine ring structure with heat resistance and structural stability, is beneficial to improving the high temperature resistance and mechanical strength of a polyester resin powder coating paint film, shows higher impact resistance, contains a dialkyl side chain, and can be used for preparing the polyester resin powder coating after being introduced into a polyester molecular chain. The modified polyester resin can generate steric hindrance and shielding effects, inhibit contact between water molecules and ester bonds in polyester molecular chains and reduce hydrolysis reaction of ester groups, so that the hydrolysis resistance of the polyester resin is improved. And the paint film has the advantages of good ultraviolet aging resistance, high weather resistance and high gloss retention rate.

The invention relates to the technical field of porous material preparation processes, in particular to a preparation method of light low-thermal-conductivity lutetium silicate aerogel, which comprises the following steps: preparing composite sol; preparing and aging wet gel; drying the gel; preparing the aerogel; the lutetium silicate aerogel is prepared by combining in-situ sol-gel with a supercritical drying process, and the lutetium silicate aerogel has relatively high porosity, can be in a light, crack-free and complete block shape, and can be used for near-net size forming; the method is simple to operate, can realize fluidized production, and is easy to industrialize; the lutetium silicate ceramic aerogel prepared by adopting an in-situ synthesis mode has higher porosity, better thermal stability and lower thermal conductivity, and can tolerate the extreme temperature of 1500 DEG C.

The invention belongs to the technical field of semi-continuous casting devices, and relates to a large-size highly-alloyed magnesium-rare earth alloy round ingot semi-continuous casting device which comprises a crystallizer, a dummy ingot base and a flow dividing disc, a plurality of stages of arc bosses are arranged on the inner bottom face of the dummy ingot base, and the radiuses of the arc bosses are sequentially increased from top to bottom; the core part is used for promoting high-temperature melt to quickly flow to the edge part and reducing the temperature difference between the core part and the edge part; the flow dividing disc comprises a vertical pipe and a plurality of fan-shaped flow dividing areas, the flow dividing areas are arranged in the circumferential direction of the vertical pipe, and the high-temperature melt flows in from the vertical pipe, flows out of the flow dividing areas and enters the crystallizer, so that the radial flow of the high-temperature melt is more uniform. According to the invention, the uniformity of melt flow, the uniformity of temperature and the uniformity of solute and structure of the cast ingot are obviously improved, the hot cracking tendency is reduced, and the cracking problem in the casting process is reduced. The prepared large-size high-toughness magnesium alloy cast ingot is free of cracks, segregation, slag inclusion and other defects of the structure, and the percent of pass is larger than 98%.

The invention discloses a high-strength and high-elongation SnPbSbInAu alloy solder and a preparation method thereof. The alloy solder comprises the following components in percentage by weight: 33.0 to 36.5 percent of Pb, 2.0 to 4.0 percent of Sb, 1.5 to 3.5 percent of In, 2.0 to 3.5 percent of Au, 0.005 to 0.012 percent of P and the balance of Sn. The preparation method of the foil strip comprises the steps of vacuum pressure casting, strip cold extrusion and cold roller rolling, the wire preparation method comprises the steps of one-time extrusion forming and close-packed rewinding, and the powder paste preparation method comprises the steps of vacuum gas atomization powder preparation, airflow screening and planetary centrifugal degassing paste preparation. The solid-liquid phase temperature of the solder ranges from 180 DEG C to 185 DEG C, the solder has the advantages of being high in ductility, strength and creep resistance, excellent in low-temperature service performance and the like, and the tensile strength of a brazed joint of the solder is two times higher than that of a Sn-37Pb eutectic solder under the same welding process; and the gold etching risk is low, and a gold-plated piece can be directly welded (without tinning treatment).

The invention belongs to the technical field of architectural ceramics, and particularly discloses a ceramic tile with a humidifying function and a preparation method of the ceramic tile. The ceramic tile comprises the following raw material components in parts by weight: 20-40 parts of pumice powder, 5-15 parts of volcanic mud, 20-30 parts of albite, 10-15 parts of kaolin, 5-15 parts of ceramic solid waste, 10-15 parts of glass powder, 1-3 parts of borax and 0.5-2 parts of carbon powder. According to the invention, pumice powder, volcanic mud and carbon powder are used as main humidity-regulating raw materials, glass powder, albite and borax are used as low-temperature flux raw materials, ceramic basic raw materials kaolin and ceramic solid waste are added, and low-temperature firing is carried out, so that the humidity-regulating ceramic tile with high strength is prepared, the deformation and cracking of the product are prevented, the moisture absorption capacity in 24 hours is 325-342 g / m < 2 >, and the humidity-regulating effect is good. The moisture liberation is 299 to 309 g / m < 2 >, and the breaking strength reaches 17.9 to 19.8 MPa.

The invention belongs to the technical field of photovoltaic target materials, and particularly relates to an indium titanium cerium niobium oxide ceramic target material, a preparation method and application thereof, and a transparent conductive oxide film. The indium titanium cerium niobium oxide ceramic target material comprises the following components: indium oxide, titanium oxide, cerium oxide and niobium oxide, the mass ratio of indium oxide to titanium oxide to cerium oxide to niobium oxide is 97-99: 1-0.3: 1-0.3: 1-0.2, the transparent conductive oxide film has high density, high purity and high strength, and the transparent conductive oxide film prepared from the transparent conductive oxide film has high carrier mobility, high conductivity and high light transmittance.

The invention discloses steel for a thin-gauge automobile beam with the tensile strength larger than 510 MPa and a production method of the steel. The steel for the automobile beam comprises, by mass, 0.06%-0.08% of C, 0.03%-0.10% of Si, 0.80%-1.00% of Mn, smaller than or equal to 0.018% of P, smaller than or equal to 0.005% of S, 0.020%-0.045% of Alt, 0.012%-0.022% of Nb, 0.025%-0.037% of Ti, 0.0008%-0.0020% of Ca and the balance Fe and inevitable impurities. The steel for the thin automobile frame has the advantages of high strength, high toughness, high forming precision and the like, meets good matching of strength and forming performance in the performance aspect, is free of cracks in a cold bending test and has good cold machining performance.

The invention provides a precision forging method for an adjustable blade of an aero-engine based on titanium alloy, which can realize precision forging forming of the blade of the titanium alloy aero-engine, enables the blade profile size of a blade forging to directly reach the size of a finished product, does not need to be machined again, is high in product percent of pass and good in air passage consistency, also can keep the continuity of a metal flow line, and is suitable for large-scale production. The mechanical property and the aerodynamic performance are high, and the surface integrity and the metallographic structure meet the design requirements. The method comprises the following steps of blanking, surface cleaning, glass lubricant spraying, heating blank making, surface cleaning, glass lubricant spraying and forging, and is characterized in that the forging procedure comprises heating upsetting, heating pre-forging and heating finish forging, and the surface cleaning and glass lubricant spraying are respectively carried out after each procedure of heating upsetting, heating pre-forging and heating finish forging.

The invention discloses a preparation method for spraying a nickel-chromium-chromium carbide coating on the surface of a gas turbine part through high velocity oxy-fuel, and belongs to the technical field of preparation of the nickel-chromium-chromium carbide coating through thermal spraying. The preparation method comprises the following steps that preparation before spraying is conducted, and nickel-chromium-chromium carbide powder for thermal spraying is placed in a drying oven to be dried; cleaning is conducted, specifically, the spraying area and the adjacent area of the part are wiped and cleaned, and impurities such as oil stains are removed; protection before sand blasting is conducted, specifically, the non-sand-blasting surface and a small part of the spraying area of the part are protected through a high-temperature-resistant adhesive tape; a sand blowing machine is provided with a 0-0.6 MPa adjustable air pressure air source and is provided with an oil-water separator; spraying is conducted, specifically, a nickel-chromium-chromium carbide coating is sprayed through hypersonic flame; and cleaning is conducted, specifically, after spraying is completed, the spraying protection clamp and the adhesive tape are removed, and floating ash on the surface of the part is cleaned. The wear-resistant coating is prepared on the surface of the aero-engine and gas turbine part by adopting the process, a nickel-aluminum bottom layer does not need to be sprayed in advance, the quality is stable, and the production cost is reduced.

The invention discloses a production method of a non-quenched and tempered cold heading steel wire rod, which comprises the following chemical components in percentage by mass: 0.18 to 0.26 percent of C, 0.10 to 0.30 percent of Si, 1.20 to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, 0.05 to 0.10 percent of Nb, 0.15 to 0.25 percent of V and the balance of Fe and inevitable impurities, and the total mass fraction is 100 percent. The invention further discloses a production method of the non-quenched and tempered cold heading steel wire rod MFT9. According to the invention, the MFT9 non-quenched and tempered cold heading steel wire rod with excellent comprehensive mechanical properties is successfully developed by controlling the processes of electric furnace smelting, LF refining, RH vacuum degassing, continuous casting, heating of a casting blank heating furnace, controlled rolling and controlled cooling and the like.

The invention provides a high-hardness crack-free flux-cored wire and a preparation method thereof.The flux-cored wire comprises an outer skin and a flux core, and the flux core comprises, by weight, 5.6-8.6 parts of boron carbide; 3.1 to 4.6 parts of 75% silicon iron; 0.6 to 1.6 parts of electrolytic manganese; 0.3 to 1.2 parts of 80% ferrovanadium; 0.3 to 1.0 part of nickel powder; 67.5 to 94.5 parts of 68% high carbon ferro-chrome; 6 to 6.5 parts of iron powder; the preparation method of the flux-cored wire comprises the steps that boron carbide, 75% ferrosilicon, electrolytic manganese, 80% ferrovanadium, nickel powder, 68% high-carbon ferrochrome and iron powder are sequentially added into a drying machine according to the formula to be dried for 2-3 h, then a three-dimensional motion mixing machine is adopted for fully and evenly mixing, and then the mixture is put into a heat preservation box to be subjected to heat preservation for use; the outer skin is placed on a forming machine, and an outer skin steel belt is rolled into a U-shaped groove through the forming machine; flux core powder is added into the U-shaped groove, a forming machine rolls and closes the U-shaped groove and draws the U-shaped groove, and the flux-cored wire is obtained; the flux-cored wire has the advantages of being high in hardness, free of cracks, resistant to high temperature and corrosion, low in production cost and beneficial to industrial production.

The invention discloses a preparation method of beryllium powder for a beryllium rolled plate ingot, and belongs to the technical field of beryllium metals.The preparation method comprises the steps that under the closed condition, a 5-30 A motor current is adopted, beryllium chippings are subjected to disc smashing, and flaky crude beryllium powder with the particle size being 15-30 microns is obtained; under a closed condition, adopting a set airflow impact parameter to impact and crush the sheet-shaped coarse beryllium powder for 20-35 minutes, then detecting the particle size of the beryllium powder, and carrying out time-sharing adjustment on the frequency of a grading wheel in the airflow impact parameter according to the detection result of the particle size of the beryllium powder until the particle size of the beryllium powder meets a preset range of the particle size of the sheet-shaped fine beryllium powder, so as to obtain the sheet-shaped fine beryllium powder. Flaky fine beryllium powder is obtained; and S3, the flaky fine beryllium powder is sequentially subjected to acid pickling, water washing, alcohol washing, vacuum drying and powder screening. The beryllium powder is flaky powder, is stable in particle size, good in consistency and high in production efficiency, and meets the rolling performance requirements of rolled plate ingots.

The invention provides a high-temperature-resistant and salt-fog-resistant wave-absorbing coating which is prepared from the following components in parts by weight: 26.9-32 parts of organic silicon resin, 54.8-57.7 parts of metal micro powder, 0.5-0.8 part of a dispersing agent, 0.5-0.8 part of an anti-settling agent, 1-1.5 parts of a salt-fog-resistant auxiliary agent and 10.6-13.2 parts of a solvent, the components are compounded and cured to obtain the high-temperature-resistant and salt-fog-resistant wave-absorbing coating, and particularly, the high-temperature-resistant and salt-fog-resistant wave-absorbing coating is prepared from the following components in parts by weight: 26.9-32 parts of organic silicon resin, 54.8-57.7 parts of metal micro powder, 0.5-0.8 part of The preparation method comprises the following steps: adding organic silicon resin, a solvent, a dispersing agent and a salt-spray-resistant additive into a reaction kettle, carrying out first dispersion stirring, adding an anti-settling agent, carrying out second dispersion stirring, adding metal micro-powder in batches, carrying out third dispersion stirring to obtain a wave-absorbing coating, spraying the wave-absorbing coating on a metal substrate, airing at room temperature, and drying at room temperature to obtain the wave-absorbing coating. And respectively baking at 55 DEG C, 100 DEG C and 250 DEG C to obtain the high-temperature-resistant salt-fog-resistant wave-absorbing coating. The wave-absorbing coating prepared by the preparation method disclosed by the invention can be free from blistering and cracking at 320 DEG C for 300 hours, and also can be free from obvious corrosion, wrinkling, cracking and falling off in a neutral salt mist environment for 480 hours.

The invention discloses a low-absorption high-emission thermal control coating resistant to an aerodynamic thermal environment and a preparation method of the low-absorption high-emission thermal control coating. The coating comprises a base material and a coating body. The coating is of a bottom surface layer structure, an organic silicon resin functional group modified phenyl methyl silicon resin component A and an organic silicon resin functional group modified phenyl methyl silicon resin component B serve as a binding agent, a resin component A comprises basic resin and a crosslinking catalyst, and a resin component B comprises basic resin and a crosslinking agent; the bottom surface layer structure comprises a bottom layer and a surface layer; mixed powder of boron nitride, aluminum oxide and hollow glass microspheres is used as filler in the bottom layer; zinc titanate powder and aluminum oxide whiskers are used as fillers in the surface layer. Aiming at various harsh working conditions such as maintaining a heat balance state required by the spacecraft in complex environments such as raining, high-temperature and high-speed pneumatic scouring, high-low temperature alternation and space radiation, the operation stability of a cabin of the spacecraft after experiencing various environments is improved, and the in-orbit space application environment requirements of the subsequent spacecraft are met.

The invention discloses a micro-arc oxidation coating on the surface of a magnesium / aluminum or magnesium / aluminum alloy composite material as well as a preparation method and application of the micro-arc oxidation coating. Belongs to the technical field of metal surface micro-arc oxidation corrosion prevention, and is a micro-arc oxidation coating formed by carrying out low-voltage passivation and high-voltage growth multi-step micro-arc oxidation treatment on the surface of a magnesium / aluminum or magnesium / aluminum alloy composite material. According to the method, the passivation layer which is relatively thin but relatively compact is prepared at low voltage, so that the metal surface activity is reduced, and the oxide film layer is prevented from being ablated and broken under subsequent high-voltage treatment; according to different response conditions of different metals to the same voltage and the growth characteristics of the micro-arc oxidation coating, the coatings on different metal sides can grow to 100 microns in a low-voltage and high-voltage combined treatment mode. The problems that the damaged part of the magnesium alloy is repaired by using aluminum and an alloy thereof, galvanic corrosion occurs in a magnesium / aluminum composite board and a magnesium / aluminum composite component in the service process, the properties of a low-voltage film layer of a composite metal material are uneven, and a high-voltage film layer is ablated and damaged are solved.

The invention relates to the technical field of polyurethane, and provides a quick-repair quick-drying thin coating type polyurethane waterproof material for a high-speed railway, which comprises the following components in parts by mass: 300-350 parts of polyether polyol, 160-170 parts of isocyanate, 75-85 parts of color paste, 1-5 parts of a defoaming agent, 15-20 parts of a chain extender, 90-100 parts of an organic solvent, 20-30 parts of modified aluminum hydroxide, 0.3-1 part of a catalyst, 20-40 parts of a curing agent, 5-10 parts of an anti-aging agent and 1-3 parts of a dewatering agent. A modifier in the modified aluminum hydroxide is a substance containing carboxyl and ester groups. Through the technical scheme, the problems of complicated construction, low strength after curing and low elongation at break of a thin coating type polyurethane waterproof material in related technologies are solved.

The invention discloses a method for testing modification performance of shopping mall site soil under high water content. The method comprises the following steps: step 1, preparing a soil sample; step 2, direct shear test; step 3, disintegration test; step 4, carrying out a scale test; 5, scanning an electron microscope; step 6, ABAQUS software modeling is carried out; step 7, analyzing an experimental result; methyl sodium silicate liquid is added to improve ruin soil for ruin repair, methyl sodium silicate reacts with carbon dioxide and water in air to generate a net-shaped organic silicon resin film, the surface of a soil body structure is wrapped with the net-shaped organic silicon resin film, the anti-capillary effect can be achieved, a hydrophobic layer with excellent performance is formed, and a product of the organic silicon resin film has micro-expansibility and can be used for repairing ruins. By means of the method, pores can be blocked, the compactness of a soil body is improved, the strength of the soil body is improved, the mechanical property and the water physical property of the ruin soil are effectively improved, a step progressive repairing method is adopted, the bottom layer is repaired firstly, then the upper layer is repaired, and finally the penetration depth of the material is deepened.

The embodiment of the invention provides narrow-distribution PLA (polylactic acid) microspheres as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a PLA material in an organic solvent to obtain a dispersed phase; based on the total volume of the dispersion phase, the concentration of the PLA material in the dispersion phase is 60-300 mg / mL; dissolving polyvinyl alcohol in hot water to obtain a continuous phase; the mass concentration of the polyvinyl alcohol in the continuous phase is 1.5-5% by taking the total weight of the hot water as 100%; enabling the dispersed phase and the continuous phase to form a stable primary emulsion by adopting a porous membrane tube through a membrane emulsification method; stirring the primary emulsion under an ice bath condition at the temperature of 10 + / -2 DEG C to obtain a cured emulsion; and sequentially centrifuging, screening, collecting and freeze-drying the cured emulsion to obtain the narrow-distribution PLA microspheres. The PLA microspheres prepared by the preparation method provided by the invention are smooth and regular in surface, free of cracks, not easy to adhere, narrow in particle size distribution and high in yield.

According to the preparation method of the alumina-based crucible for high-temperature alloy smelting, through reasonable design of the grain composition of the alumina powder raw material, formation of uniformly-distributed air holes in the crucible is promoted, the thermal shock resistance of the crucible is improved, crack expansion of the crucible in a rapid cooling and rapid heating environment is prevented, and the crucible is free of cracks after being used; by adding the coarse particles, better structural support can be provided, and thermal stress concentration is reduced, so that the thermal shock resistance of the crucible is enhanced; the aluminum oxide powder is high in lattice energy and stable in crystal structure, particle diffusion needs high activity, and the strength of the crucible is improved by adding the sintering aid.

The invention discloses a preparation method of a large-size fine-grain yttrium target material, which comprises the following steps: carrying out vacuum melting to obtain a metal yttrium cast ingot, and carrying out surface machining to obtain a metal yttrium blank; the metal yttrium blank is subjected to vacuum heat treatment and vacuum forging, and then a metal yttrium forge piece is obtained; carrying out isothermal rolling on the metal yttrium forge piece in a protective atmosphere, and carrying out heat treatment in the protective atmosphere to obtain a metal yttrium rolled piece; and carrying out dry cutting on the metal yttrium rolled piece to obtain the yttrium target material. The metal yttrium target obtained through the preparation method is large in finished product size range and good in flatness, toughness is improved while strength is improved, crystal grains are small, the crystal grain size is uniform, compactness is good, the surface is smooth and free of defects, the purity and components of raw materials cannot be changed, the sputtering face is compact, and sputtering performance is good.

The invention discloses a modified cobaltosic oxide precursor material and a preparation method and application thereof, and relates to the technical field of lithium ion batteries, the modified cobaltosic oxide precursor material comprises a cobaltosic oxide matrix, and a nickel element and a manganese element doped in the cobaltosic oxide matrix; wherein in metal elements of the modified cobaltosic oxide precursor material, the molar ratio of a nickel element is 5%-20%, the molar ratio of a manganese element is 1%-3%, the molar ratio of an aluminum element is 0.8%-3%, the D50 particle size of the modified cobaltosic oxide precursor material is 15-20 microns, the specific surface area of the modified cobaltosic oxide precursor material is 3-5 m < 2 > / g, and the particle size distribution width SPAN value of the modified cobaltosic oxide precursor material is 0.2-0.4. The precursor has the advantages of uniform particle size, no cracking on the particle surface and the like, and the lithium cobalt oxide positive electrode material prepared from the precursor material has excellent cycle stability and cycle life.

The invention discloses a plate processing technology, and aims to provide a plate arc-shaped surface processing method which is characterized by comprising the following steps: S1, plate pretreatment; s2, plate heating; s3, preparing a bending die; s4, the plates are placed and pressurized; s5, bending processing is carried out; s6, cooling treatment; s7, surface quality detection; s8, size detection; s9, post-processing the plate; and S10, final detection and packaging. Compared with the prior art, the plate arc-shaped surface machining method has the advantages that high-quality arc-shaped surface machining of the plate can be effectively realized; through a series of process steps of systematic pretreatment, heating, bending, cooling and the like on the plate, it is guaranteed that the plate does not deform or crack in the machining process, and the surface quality and the size precision of the bent plate can also be guaranteed; the invention is suitable for the technical field of plate processing.

The invention relates to the technical field of additive manufacturing of high-speed steel, in particular to a method for preparing superhard high-strength M42 high-speed steel through electron beam powder bed melting. According to the method, the defect problem caused by powder splashing in the printing process can be effectively avoided, so that the porosity of a formed part is reduced, the density of a sample is improved, the M42 high-speed steel formed through additive manufacturing through the method is free of cracks, high in density, good in surface quality and uniform in structure, and separation of intracrystalline nano-micron carbide can be increased.

The invention provides a polyurea sandwich concrete composite pipeline and a preparation method thereof. The polyurea sandwich concrete composite pipeline sequentially comprises a polyurea lining layer, a concrete pipe core, a carbon fiber restraint layer and a polyurea protective layer from inside to outside. The preparation method comprises the following steps that a formwork is erected, concrete pouring is conducted, and the concrete pipe core is obtained after curing; winding a carbon fiber rope on the outer surface of the concrete pipe core to form a carbon fiber restraint layer; constructing a polyurea lining layer on the inner surface of the concrete pipe core; and constructing a polyurea protective layer on the outer surfaces of the concrete pipe core and the carbon fiber restraint layer, and curing to obtain the polyurea sandwich concrete composite pipeline. The polyurea sandwich concrete composite pipeline provided by the invention is light in weight, high in strength and excellent in impermeability and corrosion resistance, the construction difficulty in the pipeline transportation and laying process can be reduced, the service life of the pipeline is prolonged, the safety of the pipeline is improved, and the construction and maintenance cost of a municipal drainage pipe network is reduced; and the preparation method is simple.

The invention relates to the technical field of construction measures for existing buildings, and discloses a reconstruction method for retaining the appearance of a masonry belt corridor of an industrial heritage site and changing its use. In the invention, by arranging additional double hidden columns in the side wall, the side wall is transformed into a structure hinged together at multiple ends, and then a one-way sliding hinge support with a sliding direction perpendicular to the belt corridor is arranged at the end of the belt corridor. The two points are combined to allow the belt corridor to swing, thereby greatly reducing the deformation caused by pre-arching and unloading, the uneven and constantly changing dynamic loads applied by people after the reconstruction is completed, and the influence of the wind load on the side wall caused by the larger span of the supporting beam and column pulling. Then, the side wall segment is wrapped with the additional double hidden columns and the board wall to ensure that the side wall segment does not crack during the swinging process; at the same time, the concrete of the board wall increases the original surface roughness, which is convenient for pasting a decorative layer to renovate the original worn surface of the belt corridor side wall.

The invention discloses a long-life room-temperature phosphorescent material based on polyphosphazene and application thereof. The phosphorescent material is obtained by functionalizing tripolyphosphazene and doping the functionalized phosphor with a polyvinyl alcohol matrix. The functionalized phosphor obtained by functionalization of the tripolyphosphazene comprises THMD, THDD, THMOD or THDOD. The invention also discloses a phosphorescent film prepared from the phosphorescent material. The phosphorescent film shows excellent luminescence performance, high transparency and good processing performance. The film is applied to a flexible electronic device and a fingerprint recording technology, the doped film has extremely high mechanical flexibility and transparency, large-area preparation can be realized without generating cracks, and the application field of an organic long-life room-temperature phosphorescent material is expanded.

The utility model discloses a kind of light-weight motor mounting bracket, it is related to motor bracket production appliance technical field, including installation base, installation base top one end is welded with mounting plate, mounting plate bottom side is welded with the reinforcing rib for strengthening fixed, reinforcing rib bottom is welded on installation base, mounting plate top is fixedly connected with connecting block, connecting block is opened with the fixed hole for connecting external equipment, mounting plate is opened with the heat dissipation hole for ventilation, the utility model is set through connecting block, can ensure the reliable connection of bracket and external equipment, optimize the transmission path of force, reduce stress concentration;Through the setting of expansion bolt, the quick, accurate installation of bracket can be realized, the firmness of guarantee installation;Through the setting of reinforcing rib, it can be ensured that the connecting part of mounting plate and installation base does not crack or deform when motor high-speed operation or load changes, solve the structural damage problem caused by insufficient strength of connecting part of traditional bracket.

The invention discloses artificial clay formed by crosslinking iridoid and a preparation method of the artificial clay. The artificial clay is prepared by the following method: step A, preparing an artificial clay precursor; step B, adding an iridoid cross-linking agent into the artificial clay precursor to obtain an artificial clay prepolymer; and step C, fully stirring the artificial clay prepolymer for condensation reaction to obtain the artificial clay. The formula of the artificial clay adopts non-toxic environment-friendly materials, does not contain components harmful to a human body, does not contain boron, has no pungent smell, and is healthy, safe and environment-friendly. The prepared artificial clay is excellent in tensile property, can be randomly toned, and is outstanding in molding ability; the artificial clay can be repeatedly used and naturally air-dried, and the air-dried artificial clay is bright in color, ultralight, crack-free and excellent in elasticity, can be stored for more than 3 years for a long time, and can be added with characters for coloring.