32results about How to "No crack" patented technology

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.

This invention discloses a method for preparing high-elongation bars for cold forging, belonging to the field of aluminum alloy preparation technology. Through optimization of composition and process, the prepared bars possess high purity, uniform and fine equiaxed grain structure, and excellent plasticity, with significantly improved elongation. This meets the stringent requirements of cold forging for high material plasticity, resulting in a bright, crack-free surface and uniform grains after cold forging, overcoming problems such as oxide scale, coarse grains, and poor dimensional accuracy caused by hot forging. Furthermore, the introduction of modified talc and sodium nitrate as refining agents further promotes uniform microstructure, achieving high elongation and excellent cold forging performance.

This invention discloses a hot-rolled steel sheet for vacuum train tubes that exhibits excellent yield strength, weldability, low-temperature toughness of the welded portion, vibration damping ratio, and is free from hot cracking. The hot-rolled steel sheet according to this invention is characterized in that its alloy composition, by weight percent, comprises: C: less than 0.06% (more than 0%), Si: 0.5-1.5%, Mn: 1.2-2.2%, Cu: 0.5-1.5%, Ni: more than 0.25%, Ti+Nb+V: less than 0.02% (inclusive of 0%), the balance being Fe and unavoidable impurities.

The invention discloses a lithium manganate positive electrode material, a preparation method and an applied lead-lithium battery, relates to the technical field of lithium manganate positive electrode materials, and solves the problems that the existing lithium manganate positive electrode material is poor in structure and interface stability and poor in rate and cycle performance. The positive electrode material is composed of a lithium manganate matrix and a double-layer composite coating, the matrix is prepared by taking lithium carbonate and manganous-manganic oxide as raw materials and doping magnesium hydroxide, aluminum hydroxide and titanium dioxide multi-plasma phase; the lithium manganate positive electrode material is prepared by uniformly compounding a lithium manganate matrix modified by a spinel inner layer, vinyl functionalized MOF and a polyvinylidene fluoride-hexafluoropropylene copolymer on the surface of an aluminum foil receiver through an electrospinning-electrospray synergistic process. The material is applied to the lead-lithium battery, shows excellent electrochemical performance and has good practical application value.

The application discloses a low-cost high-entropy alloy and a coating preparation method for marine engineering equipment, designs a Co high-entropy alloy system without noble metals, and a specific expression is FeCrNiCu 0.5‑y Mo x Si y , wherein x is in a range of 0.2-1, and y is in a range of 0-0.5.The coating prepared by the application has the advantages of good friction and wear resistance and corrosion resistance, is composed of face-centered cubic structure (FCC), body-centered cubic structure (BCC) and ordered phases thereof, can produce good metallurgical bonding with a base body, and has no obvious defects such as pores and cracks.

The application provides a wear-resistant composite piercing mill head manufacturing method and a piercing mill head, and the manufacturing method comprises the following steps: S1, preparing a steel base head; S2, adopting a submerged-arc welding process to make a flux-cored wire cladded on a working cone surface and a nose end surface of the steel base head, so as to form a cladding layer with a thickness of 6-8 mm; and S3, pre-oxidizing the cladding layer of the steel base head at high temperature, so that the wear-resistant composite piercing mill head is obtained. The wear-resistant composite piercing mill head manufacturing method has a dense and uniform oxide film on the surface of the cladding layer of the piercing mill head, the oxide film is firmly combined with the cladding layer, and the existence of the dense and uniform oxide film can reduce the power consumption of a steel pipe piercing mill and prolong the service life of the piercing mill head.

This invention discloses a gas diffusion layer with multi-level mass transfer channels, its preparation method, and its application. The gas diffusion layer with multi-level mass transfer channels includes a substrate layer and a microporous layer on the substrate layer; wherein the microporous layer comprises carbon black, hollow porous carbon nanofibers, and optionally a hydrophobic binder. This invention uses hollow porous carbon nanofibers as a novel MPL carbon material to synergistically construct a gas diffusion layer with better water vapor management capabilities in conjunction with carbon black particles. The resulting gas diffusion layer exhibits excellent comprehensive performance; its hollow porous structure provides additional water transport channels, improving water vapor transport capacity, thereby enabling the assembled membrane electrode to have better output performance.

This application provides a gradient-doped ferroelectric thin film device and its fabrication method, relating to the field of optoelectronic device technology. The gradient-doped ferroelectric thin film device comprises, from bottom to top, a substrate, a buried oxide layer, a buffer layer, and a ferroelectric thin film material layer; the ferroelectric thin film material layer is doped with impurity ions, with the doping concentration of the impurity ions increasing sequentially from bottom to top. This application, by employing a bottom-up incremental gradient doping design, optimizes the interface defects and internal stress of the ferroelectric thin film, overcomes the problem of lattice mismatch between ordinary ferroelectric thin films and the substrate layer, achieves improved crystal quality and enhanced electro-optic coefficient, and effectively improves the electro-optic effect.

This invention relates to the field of electronic paste preparation technology, and discloses a low sheet resistance tungsten-copper electronic paste and its preparation method, comprising the following steps: Step 1, preparing tungsten-copper composite powder: spherical tungsten powder with a diameter of 1-10 μm and copper powder with a size of 1-3 μm are mixed by mechanical mixing, with a tungsten to copper weight ratio of 3:1-6:1. Before mixing, the copper powder needs to undergo graphene coating pretreatment; Step 2, preparing an inorganic binder: the inorganic binder includes, but is not limited to, the following components: glass powder, CuO, TiO2, La2O3, Pu6O11; Step 3, preparing an organic carrier: the organic carrier includes a solvent, an organic binder, and a thickener; Step 4, preparing the tungsten-copper paste. The tungsten-copper paste of this invention has widely available raw materials, a simple preparation process, and is suitable for mass production. Although graphene, a high-priced material, is added, the amount added is small and the performance is particularly excellent, making the cost of the tungsten-copper paste of this invention far lower than that of similar foreign products, resulting in a very high cost-performance ratio.

This application relates to a spraying process for a highly corrosion- and wear-resistant yttrium oxide composite coating, aiming to solve the problems of high porosity, poor high-temperature stability, and insufficient wear resistance of existing yttrium oxide coatings. The process includes degreasing and cleaning, pure water immersion, sandblasting roughening, steam and water rinsing, ultrasonic cleaning, pre-drying, plasma spraying, orthogonal experimental parameter optimization, deep ultrasonic cleaning, and final drying and curing. A yttrium oxide and zirconium oxide composite powder is used to form a dense coating under optimized plasma spraying parameters, and high cleanliness is ensured through multi-stage cleaning and clean environment control. Through the above technical solution, this application significantly improves the coating's density, chemical stability, wear resistance, and thermal shock resistance, effectively blocks the penetration of corrosive media, reduces particulate contamination, and meets the stringent requirements of semiconductor etching equipment for long-lasting protective coatings.

The utility model discloses a model bracket for ship design, including multi -angle fastening adsorption subassembly, multi -angle fastening adsorption subassembly includes strip -shaped groove, circular receiving groove, sphere, receiving cylinder, cylindrical groove, cylinder rod and sucking disc, the strip -shaped groove and circular receiving groove are set up on the bracket main part, the sphere is movably connected in the strip -shaped groove and circular receiving groove, the receiving cylinder is fixedly connected on the sphere middle part, the cylindrical groove is set up in the receiving cylinder, the cylinder rod is movably connected in the cylindrical groove, the sucking disc is fixedly connected on the cylinder rod top. The utility model ball can make the sucking disc with the ship model surface form adaptive tilt in the rotation of circular receiving groove, ensure that sucking disc overall even stick together, eliminate the edge " line contact " stress concentration problem caused by traditional rigid connection, protect the ship model surface made of brittle material such as resin, ABS and do not produce indentation or crack, can further avoid the phenomenon of stress damage of ship model.

This invention discloses a low-carbon equivalent, high-toughness, ultra-high-strength marine engineering steel, FH550, and its production method, belonging to the field of metallic materials technology. The chemical composition of this steel, by mass percentage, is: C: 0.06~0.12%, Si: 0.20~0.40%, Mn: 1.30~1.70%, P≤0.015%, S≤0.003%, Al: 0.02~0.05%, Nb: 0.030~0.06%, V: 0.010~0.040%, Ti: 0.010~0.025%, Cr: 0.10~0.30%, B: ≤0.0005%, with the balance being Fe and impurities, and a carbon equivalent (Ceq) ≤0.44%. The production method includes: hot metal pretreatment → BOF smelting → LF refining → RH vacuum treatment → thick slab continuous casting → slow cooling with cover → billet heating → two-stage rolling → accelerated cooling → flaw detection → inspection. The two-stage rolling adopts a strong reduction process, and accelerated cooling after rolling replaces the quenching and tempering treatment. The FH550 steel plate of this invention has a yield strength ≥550MPa, an average KV2 impact energy ≥260J at -60℃, and combines ultra-high strength, low-temperature high toughness, and excellent weldability. The production process is simple, has a short cycle, and low cost, and can be widely used in deep-sea marine engineering, bridges, and other fields.

This invention relates to the field of carbon fiber sizing agents, specifically to carbon fiber sizing agents, their preparation methods, and applications. The carbon fiber sizing agent comprises the following components in parts by weight: 100 parts sulfonated polyether ether ketone (PEEK), 1-5 parts aminated carbon nanotubes, 0.5-2 parts catalyst, and 2-6 parts condensing agent. The carbon fiber sizing agent provided by this invention exhibits uniform dispersion, long-term storage stability, and excellent film-forming properties. The carbon fiber-PEEK resin composite material prepared using this carbon fiber sizing agent demonstrates excellent interfacial bonding strength and significantly improved mechanical properties.

This invention belongs to the field of building materials technology, specifically relating to a high-flexibility emulsion, its preparation method, and its application in flexible ceramics. The high-flexibility emulsion uses methyl methacrylate, isooctyl acrylate, hydroxyethyl acrylate, and modifier A as core monomers; and methyl methacrylate, styrene, hydroxyethyl acrylate, and modifier B as shell monomers, prepared using a monomer pre-emulsification semi-continuous seed emulsion polymerization process. Modifier A is obtained by reacting epoxidized cashew nut shell powder with a mercapto compound; modifier B is obtained by reacting carboxybenzotriazole, epoxy silane, and epoxy acrylate. This invention prepares a core-shell structured high-flexibility emulsion using a monomer pre-emulsification semi-continuous seed emulsion polymerization process. By introducing specific modifiers A and B into the core and shell monomers, the low-temperature flexibility, frost resistance, tensile properties, and weather resistance of flexible ceramics are optimized.

The application discloses a preparation method of a multilayer composite crosslinking ceramic flow-casting green tape, which comprises the following steps: inputting slurry into multiple interval-mounted material boxes of a flow-casting machine, making the carrier tape pass through the material boxes and making the slurry in the material boxes be stacked on the carrier tape layer by layer to be flow-cast into a multilayer composite crosslinking flow-casting green tape; the slurry comprises silicon nitride ceramic powder, a sintering aid, a solvent, a binder, a dispersing agent, a plasticizer and a crosslinking agent; the plasticizer is at least one of cashew phenol Mannich tiglic acid ester, dibutyl phthalate, dimethyl phthalate and polyethylene glycol, and the dispersing agent is at least one of fish oil, castor oil and polyvinylpyrrolidone. The obtained green tape is uniform, smooth and flat, free of cracks, wrinkles and bubbles, has good toughness and high strength, is not easy to deform, and has adjustable thickness, and the problem that a crosslinking system ceramic green tape is difficult to flow thick is solved.

The invention discloses a preparation method for coating one side of glass fabric with polytetrafluoroethylene by a vertical gluing machine, and belongs to the field of manufacturing of bonding sheets in copper-clad lamins.The preparation method comprises the steps that firstly, the glass fabric is installed on a rolling device, and tension is adjusted through a fabric storage mechanism; then, a vertical three-roller precise transfer coating system is used for quantitatively coating the PTFE slurry with the controlled viscosity in a constant-temperature glue storage tank on the cloth surface in a single face mode, and the non-coating face is synchronously gelatinized; the coated cloth enters a six-section type vertical drying oven to be subjected to stepped curing, pre-drying, high-temperature melting, crystallization curing and gradient cooling are conducted in sequence, the temperature of the high-temperature section reaches 380-385 DEG C, and a double-layer air curtain is arranged on the non-coated side for isolation; and finally, cooling to 50-80 DEG C, and rolling. The tension is controlled within the range of 5-15 N / cm through a sectional type vertical tension control system in the whole process. According to the method, single-face accurate coating is achieved, the problems of slurry waste, poor uniformity, many defects, unstable size and the like of a traditional horizontal process are solved, and the product performance is excellent.

This application relates to the field of building decoration materials, and in particular to a crack-resistant metallic paint and a high-strength steel plate crack-resistant component, as well as their construction method. A crack-resistant metallic paint comprises the following raw materials in parts by weight: 300-500 parts fluorocarbon emulsion, 80-120 parts elastic emulsion, 10-40 parts active toughening agent, 90-110 parts metallic effect pigment, 30-40 parts film-forming aid, 1.5-2.5 parts dispersant, 15-20 parts thickener, and 280-350 parts water. By compounding the fluorocarbon emulsion and elastic emulsion and adding the active toughening agent, the paint film achieves an elongation at break ≥82%, a flexibility of 1mm without cracking on a shaft, and resistance to artificial aging ≥3000h without cracking, thus achieving a synergistic unity of high elasticity and high weather resistance.

A method for preparing a binary formula for Dai pottery clay and its application is disclosed. The method involves taking Dai pottery clay from the Honghe River basin, five-colored clay from Honghe County, and charcoal powder. The Dai pottery clay and five-colored clay are sun-dried and weathered for at least three months. The Dai pottery clay from the Honghe River basin has a SiO2 content of not less than 50%, an Al2O3 content of not less than 15%, an Fe2O3 content of not less than 10%, and a loss on ignition of less than 10%. The five-colored clay from Honghe County has a SiO2 content of 72-82%, an Al2O3 content of 9-12%, and an Fe2O3 content of 3-5%. The method involves soaking the Dai pottery clay and five-colored clay in water until fully saturated, then ball-milling them. The slurry is sieved, and then charcoal powder is added. After stirring evenly, the clay is pressed to drain water and then kneaded to remove air. This invention can improve the throwing and molding performance of Dai pottery clay, increase the sintering temperature and the density and strength of its structure, and reduce the burn-off rate.

This invention discloses a titanium oxide-zirconia composite target, its preparation method, and its applications. The titanium oxide-zirconia composite target comprises the following raw materials in parts by weight: 60-80 parts titanium oxide; 20-40 parts zirconium oxide; and 0.5-3 parts cerium oxide or 0.1-1 parts tantalum oxide. By doping titanium oxide and zirconium oxide with specific amounts of cerium oxide or tantalum oxide, this invention effectively improves the grain size of the titanium oxide-zirconia composite target and reduces grain boundary defects. The oxide film obtained from the titanium oxide-zirconia composite target of this invention possesses high refractive index and a wide bandgap, with the bandgap increased to over 3.5 eV, expanding its application in deep ultraviolet optical devices. The doping of cerium oxide or tantalum oxide improves the crack resistance of the film, making it crack-free after bending.

The present application relates to a kind of TR assembly package high thermal conductive eutectic medium temperature solder and foil strip preparation method, belong to microelectronic system packaging field.The solder composition: Sb 10.5~12.5wt%, Sn 0.5~2.0wt%, Ag 0.1~0.5wt%, Cu 0.1~0.5wt%, Pd 0.05~0.2wt%, Ni 0.05~0.2wt%, In 0.01~0.1wt%, P0.002~0.01wt%, the balance is Pb.Its foil strip preparation method includes raw material selection and intermediate alloy preparation, non-vacuum medium frequency induction melting, fast cooling horizontal casting and isothermal rolling step.The alloy melting point is moderate, has high strength, high thermal fatigue and high thermal conductivity etc.;Alloy foil composition is uniform, IMC is small, surface is clean, and the yield is high, satisfies the multistage packaging demand of TR assembly in microelectronic system.

The utility model relates to a kind of soft rubber tube based on composite structure reinforcement, including rigid base material piece and soft coating, and the outer periphery of rigid base material piece is equipped with first interlayer groove, first interlayer groove has the outer surface and inner surface oppositely arranged along the direction of thickness, and through hole is set on first interlayer groove, and the through hole is through outer surface and inner surface;Soft coating injection molding is formed on the outer periphery of rigid base material piece, and fills first interlayer groove and forms anchoring structure, when injection molding, melt flows to the side of rigid base material piece away from soft coating by through hole, and after cooling, it forms the encapsulating layer integrated with rigid base material piece.The utility model constructs basic physical binding force by concave-convex fitting, and soft coating forms the effect of " front and rear wrapping + mechanical lock catch " to rigid base material piece, avoids the peeling risk of single surface combination, significantly improves the binding firmness, and there is no cracking, loosening at the joint, solves the temperature sensitivity problem of traditional process.

This utility model provides a crimping tool for inertial switches. The crimping tool is used for inertial switches, which include a contact sleeve, a contact rod housed in the contact sleeve, a safety spring elastically abutting against the contact sleeve and the contact rod, and a cover plate on the contact sleeve. The crimping tool includes a first mold structure and a second mold structure. The first mold structure can accommodate the inertial switch and includes a base, a first mold on the base, and a core rod on the first mold. The second mold structure can cooperate with the first mold structure and includes a second mold, a core on the second mold, and a punch on the upper end of the core. This crimping tool has high crimping efficiency and high pass rate, and is suitable for crimping and riveting non-threaded cover plates on similar types of inertial switches for various products.

This invention discloses a composite functional coating for UTG flexible glass, its preparation method, and its application, belonging to the field of glass surface treatment technology. It includes a high refractive index matching layer disposed on the surface of the UTG flexible glass, and a low refractive index hydrophobic reinforcement layer disposed on the surface of the high refractive index matching layer. The high refractive index matching layer is formed by heat treatment of a silane coupling agent-modified nano-zirconium dioxide and nano-silica composite sol. The low refractive index hydrophobic reinforcement layer is obtained by stacking two types of silica nanospheres with different particle sizes and in-situ modification with perfluoroalkylsilane. The coating of this invention enables the UTG flexible glass to achieve an average transmittance of over 95.3% in the 380-1100nm wavelength range, a water contact angle >150°, and a performance retention rate of over 95% after 1500 hours of UV aging and dry brushing. It also exhibits grade 0 adhesion, bend resistance, and fully meets the stringent requirements of various high-end flexible optoelectronic devices for high transmittance, durable self-cleaning, and weather-resistant toughness of the substrate glass.

This invention discloses a flexible multifunctional composite film integrating heat dissipation and flame retardancy, its preparation method, and its application, belonging to the technical field of multifunctional composite film materials. The composite film is composed of MXene, graphene oxide (GO), and carbon nanotubes (CNTs) in a specific mass ratio, prepared by magnetic stirring, ultrasonic dispersion in a cold water bath, pulsed / gradient negative pressure vacuum filtration, and freeze-drying. The film thickness is 20-30 μm. In the layered structure of the film, GO sheets are inserted between MXene layers, and CNTs bridge the layers to form a three-dimensional thermally conductive network, achieving high in-plane thermal conductivity (≥4 W·m). ‑1 ·K ‑1 It also possesses excellent flame retardancy (limiting oxygen index LOI ≥ 28%, UL-94V-0 rated) and excellent mechanical flexibility. This film can be used as an integrated heat dissipation-flame retardant interface layer in high-power density electronic devices, electric vehicles, and other fields to address risks such as thermal runaway and fire.

The invention relates to a formulation for producing an optical layer containing a metal oxide. The formulation may exhibit at least one of properties as a higher material or as a high performance material. The formulations may be used in nanotechnology processes to fabricate semiconductor device / display device applications, such as semiconductor chips, or liquid crystals, quantum dots, OLED displays fabricated on semiconductor controlled substrates.

The invention discloses an environment-friendly long-acting antifouling paint and a preparation method thereof, and belongs to the technical field of paint materials and antifouling. The environment-friendly long-acting antifouling paint comprises the following components in parts by weight: 30-50 parts of a component A, 25-45 parts of a component B, 8-25 parts of a functional body, 1-5 parts of color paste and 0.3-3 parts of an auxiliary agent, the component A is an aliphatic isocyanate prepolymer which is prepared from aliphatic isocyanate and castor oil through a reaction, and the specific preparation raw materials comprise the following components in parts by weight: 20-40 parts of aliphatic isocyanate and 10-20 parts of castor oil; the component B is polyaspartic acid ester, and the molecular weight of the polyaspartic acid ester is 800-1500 g / mol; the castor oil has good reaction activity with aliphatic isocyanate, can significantly improve the flexibility of a prepolymer (polyurea precursor) and the cohesiveness with a base material, and can optimize the compatibility of the polyurea precursor with polyaspartic acid ester with the molecular weight of 800-1500 g / mol, thereby improving the mechanical stability and weather resistance of the whole polyurea paint coating. The technical problem that an existing coating material cannot give consideration to synergistic improvement of environmental protection property and mechanical property is solved.

The application discloses a high beryllium copper alloy strip based on electric pulse assisted rolling and a preparation method thereof, and belongs to the technical field of precipitation hardening alloy material processing. The preparation method comprises the following steps: S1, after preparing materials according to the mass percentages of various chemical components of the beryllium copper alloy to be prepared, the materials are put into a vacuum induction melting furnace to be vacuum melted into a liquid state, and then the liquid state is poured into a beryllium copper alloy ingot; S2, the beryllium copper alloy ingot is heated to a temperature of 800-850 DEG C, and then hot-rolled after being kept at the temperature for 15-20 hours to obtain a beryllium copper hot-rolled blank; S3, the beryllium copper hot-rolled blank is sequentially subjected to annealing treatment and face milling; S4, the beryllium copper hot-rolled blank after the face milling is sequentially subjected to rough rolling, edge cutting, solid solution treatment and electric pulse rolling to obtain a beryllium copper alloy strip. The beryllium copper alloy prepared by the application has no cracks under a large deformation, has a large degree of grain crushing, has a small grain size, has good formability, and has a short production flow and high production efficiency.

This invention relates to the field of automotive interior technology, specifically disclosing an environmentally friendly, high-strength automotive headliner. From bottom to top, it comprises: a non-woven fabric layer, a first adhesive layer cast on the surface of the non-woven fabric layer, a first toughening fiber felt bonded to the surface of the first adhesive layer, a second adhesive layer cast on the surface of the first toughening fiber felt, a polyurethane substrate bonded to the surface of the second adhesive layer, a third adhesive layer cast on the surface of the polyurethane substrate, a second toughening fiber felt bonded to the surface of the third adhesive layer, and a fourth adhesive layer cast on the surface of the second toughening fiber felt. Both the first and second toughening fiber felts are made of toughening fibers. The first, second, third, and fourth adhesive layers are all made of composite ethylene-vinyl acetate copolymer. The multi-layered structure of this automotive headliner features tight adhesion, preventing interlayer separation, good external rigidity, and no deformation. It also exhibits excellent sound absorption performance, is odorless, and is safe and environmentally friendly.