1654results about How to "Stable mechanical properties" patented technology

Deposition of metal in a preferred shape, including coatings on parts, or stand-alone materials, and subsequent heat treatment to provide improved mechanical properties. In particular, the method gives products with relatively high yield strength. The products often have relatively high elastic modulus, and are thermally stable, maintaining the high yield strength at temperatures considerably above 25 DEG C. This technique involves depositing a material in the presence of a selected additive, and then subjecting the deposited material to a moderate heat treatment. This moderate heat treatment differs from other commonly employed "stress relief" heat treatments in using lower temperatures and/or shorter times, preferably just enough to reorganize the material to the new, desired form. Coating a shape and heat treating provides a shaped deposit with improved material properties. Coating a shape with a portion connected to a base and a portion detached therefrom can provide a resilient, conductive contact useful for electronic applications.

The electrical and mechanical properties of structures such as lead frames and other electrical/electronic devices containing, during processing, copper/tin interfaces are improved by introduction of nickel to such interface. Typically, a weight percentage of nickel to tin in the range 1 to 12 weight percent yields upon melting of the tin, an intermetallic compound with essentially no occluded, unbound tin. Thus undesirable anomalous structures such as tin needles and substantially non-planar interface compositions are avoided. Advantageously a nickel/tin/copper intermetallic interface that is substantially planar is formed in the substantial absence of needle-like tin structures.

An improved medical pad for contact thermal exchange with a patient includes a fluid circulation layer for containing a thermal exchange fluid circulatable therethrough, a first port and a second port for circulating the thermal exchange fluid in to and out of the fluid circulation layer, and a hydrogel layer interconnected to and extending across one side of the fluid circulation layer to define an adhesive surface for adherence to a patient's skin. The hydrogel layer comprises an ultra violet light-cured composition that includes a cross-linking copolymer in an amount of between about 15% to 30% by weight of the composition, water in an amount of between about 15% to 40% by weight of the composition, and glycerol in an amount of between about 25% to 35% by weight of the composition. The hydrogel layer is provided to have a thermal conductivity of at least about 1.9 ca//hr-cm-° C.

The invention relates to a novel preparation technology of polyoxymethylene fiber, in particular to the novel preparation technology of the polyoxymethylene fiber via multi-stage slow cooling and three-stage drawing with different media, which comprises the following steps: vacuum-drying polyoxymethylene granular materials, heating and melting via a screw extruder, melting and extruding by a spinneret, leading small melt flow to pass through the multi-stage slow cooling, carrying out high-speed traction, passing through a moistening and oiling cluster, winding, then obtaining as-spun fiber, carrying out hot air drawing and two times of drawing with different types of solvent, then carrying out hot molding and finally preparing the polyoxymethylene fiber. The novel prepration technology can solve the problems of matching between the multiple sections of atmosphere and temperature and the spinning process control and the control of the drawing with multiple media and make up for the deficiencies that the single atmosphere and temperature and the single medium drawing of the prior art lead the structure to be difficult to stable and uniform.

A high intensity deformed steel bar and a manufacturing procedure thereof are disclosed, belonging to the field of steel metallurgy and suitable for the deformed steel bar with 12mm to 40mm production standard. The high intensity deformed steel bar of the invention comprises the ingredients: C: 0.12-0.25%; Si; 0.12-0.80%; Mn: 0.30-1.55%, P: 0.01-0.035%, S: 0.01-0.040%, equivalent weight of carbon: 0.19-0.51% the rests are Fe. The procedure flow of the invention comprises the steps of: squaring billet, heating, roughly and intermediately rolling, precisely rolling, performing QTB water penetration, placing on a cooling bed (cooling naturally), scaling, checking and putting into storage. The invention has the advantage that: chemical ingredients are designed diversely according to the diverse production standards of the deformed steel bar, the after-rolling remaining heat treatment procedure is used to keep the steel bar in a good plasticity and toughness.

The invention discloses a halogen-free flame retardant sheath material for a nuclear cable, a cable sheath, and a preparation method and an application of the cable sheath. The halogen-free flame retardant sheath material for the nuclear cable comprises the following raw materials: 100 parts of a polymer base material comprising ethylene vinyl acetate copolymer and ethylene methyl methacrylate copolymer, 100-140 parts of an inorganic fire retardant comprising magnesium oxide, 15-25 parts of phenoxycycloposphazene; 15-30 parts of nitrogen fire retardant comprising melamine cyanurate, 4-8 parts of a compound antioxidant comprising a main antioxidant, an auxiliary antioxidant and an ultraviolet light absorber, 5-15 parts of an anti-radiation agent comprising high phenyl siloxane rubber and an anti-radiation agent A, and 6-12 parts of a processing aid comprising a cross-linking sensitizing agent and a lubricant, wherein the anti-radiation agent A is boron carbide and/or boron nitride. The halogen-free sheath material for the nuclear cable disclosed by the invention is good in superior performance, good fire retardant performance, and stable anti-radiation performance, electrical performance and mechanical performance.

The invention provides a method for manufacturing an aluminium alloy sheet for an automobile fuel tank. The method comprises the steps of batching, smelting, refining, grain refining, degassing, filtering, casting, saw-cutting, milling, homogenized heating, hot-rolling, cold-rolling, cleaning, low-temperature stabilized annealing, transverse shearing, edge straightening, board cutting, inspecting and the like. The aluminium alloy sheet for the automobile fuel tank has the advantages of stable mechanical property, precise dimensional tolerance, finish surface and the like. Compared with the present plastic fuel tank, the automobile fuel tank manufactured by the aluminium alloy sheet produced by the method has the advantages of high strength, sun exposure resistance, aging resistance, breakage prevention, environmental protection and the like, and also has the advantages of corrosion resistance, rusting avoidance, light weight, good economic benefits within the product life cycle, high material reutilization ratio and the like in comparison with a copper fuel tank.

The invention relates to cranioplasty prosthesis with biological activity and a preparation method of the cranioplasty prosthesis. The cranioplasty prosthesis with biological activity sequentially comprises an unmodified cranioplasty prosthesis layer, a modified cranioplasty prosthesis layer and a nanofiber membrane layer from inside to outside. The invention further provides a preparation method of the cranioplasty prosthesis. By virtue of a three-layer structure and polyaryletherketone materials which are equivalent to a bone of a human body in hardness, strength and weight, are good in biocompatibility, and a 3D printing technology, a cranioplasty prosthesis implant has reliably safety and effectivity and high matching degree. The cranioplasty prosthesis provided by the invention is capable of loading a plurality of bionic scaffolds and bioactive substances, and promoting exchange of nutrient substances inside and outside the prosthesis, and is beneficial to growth of tissues.

The invention relates to a light gauge aluminum foil woolen produced with AL-Ti-C wire refiner and a preparation method. The iron-silicon rate of the woolen ranges between 4.3-5.3. The process of the preparation technology is sequentially as follows: material preparation, batching, feeding, melting, stirring, primary refining of a smelting furnace, drossing, sampling, ingredient adjustment, secondary refining of the smelting surface, drossing, converter, primary refining in a holding furnace, intensified refining in the holding furnace, online addition of AL-Ti-C wire intermediate alloy refiner, Ar online degassing, filtration, continuous casting into 7.0-7.5mm cast rolling plates, cold rolling, high-temperature homogenizing annealing of a primary sheet strap, cold rolling, trimming of a rereeling machine, cold rolling, intermediate annealing of a secondary sheet strap, cold rolling to 0.26-0.32mm, trimming of the rereeling machine, and packaging. The cost is low, the quality is stable, the calendaring of the aluminum foil and grain refining are good in effect, and the probability of generating pinholes is low during production.

The invention relates to a water swelling polyurethane elastomer sealing product material and a preparation method. The material is prepared from the following three components (A), (B) and (C) through polymerization reaction of two steps, the elastomer material has water swelling property, and a main chain structure of material molecules absorbs water, wherein the (A) is hydrophilic polyether type polymer1polyol; the (B) is polyisocyanates; and the (C) is low-molecular polyol and amino chain-extended crosslinker. The molar ratio of the (B) to the (A) in an isocyanate end capping reaction is 1.3 to 2.8; and the molar ratio of a product of the isocyanate end capping reaction of the (A) and the (B) to the (C) in a chain-extended crosslinking reaction is 0.75 to 1.05. In the preparation method for the material, the reaction of the two steps is a reaction process of liquid polymerization, and the production of a product is an elastomer casting-molding process. The material has the characteristics of small mass variation rate and stable physical performance after the material absorbs the water repeatedly to swell, and permanent compression deformation and small stress relaxation.

The invention provides an application of a carboxylic acid metal salt of tetrahydrophthalic anhydride as a nucleating agent for a polypropylene beta crystal form. By adopting the carboxylic acid metal salt of tetrahydrophthalic anhydride as the nucleating agent, the generation of beta crystal form polypropylene can be induced efficiently; as tested by differential scanning calorimetry (DSC), the content of a beta crystal form is up to 86-97.7 percent; after nucleation modification by using the carboxylic acid metal salt of the tetrahydrophthalic anhydride, the punching strength of polypropylene is increased by 5-8 times, the heat deflection temperature is increased greatly, and high mechanical property is achieved; and moreover, the carboxylic acid metal salt has the advantages of chemical stability, high dispersity, coloring resistance, capability of improving the working quality of a product and wide application range in the field of materials special for polypropylene.

The invention provides an aluminum alloy 5052 having high corrosion resistance and a manufacturing method thereof, which belongs to the technical field of alloy materials and solves the problem of low corrosion resistance of the traditional aluminum alloy 5052 material. The aluminum alloy 5052 having high corrosion resistance comprises the following components in percentage by weight: no more than 0.20% of Si, no more than 0.20% of Cu, 2.4-2.6% of Mg, no more than 0.10% of Zn, no more than 0.10% of Mn, 0.18-0.30% of Cr, 0.01-0.40% of Fe, no more than 0.05% of single other element, no more than 0.15% of total other elements, 0.01-0.8% of rare earth elements and the balance of Al. The aluminum alloy 5052 having high corrosion resistance can improve the corrosion resistance and simultaneously maintain the stabilization of mechanical properties.

The invention discloses a numerical control cutting machine, which comprises an upper workbench, a guide post, a guide sleeve, a screw support, a ball screw, a numerical control moving head, a connecting seat, a step motor, a rotary die holder, a servomotor, a workbench, a balancing connecting rod, a swing plate, a connecting plate, an oil cylinder, and a numerical control box. The computer programming control technology and a human-computer interface are adopted by the machine, a chain wheel on the servomotor drives a chain wheel on the ball screw through a chain, so that the connecting seat on the ball screw drives the numerical control moving head to advance and retreat in the longitudinal direction to realize mobile cutting; the rotary die holder on the numerical control moving head driven by the step motor can rotate 360 DEG; layout and blanking are carried out digitally; and the computer controls a hydraulic system to push the guide post on the oil cylinder to drive a balance mechanism, so that the upper workbench drives the numerical control moving head ascend and descend to realize automatic cutting. The machine has quick response, high precision, stable mechanical properties, low failure rate, high automation degree, and high production efficiency without waste and ungraded product, is convenient and safe to operate, and obviously saves energy.

The invention provides an air hardening steel for oil casing with low yield ratio electrical resistance welding (ERW), an oil casing with low yield ratio electrical resistance welding which is made of the air hardening steel and a preparation method of oil casing. The components of the air hardening steel for oil casing with low yield ratio electrical resistance welding (ERW) in weight percent comprises: 0.19 to 0.29 percent of Carbon, 0.1 to 0.4 percent of Silicon, 1.0 to 1.3 percent of Manganese, less than or equal to 0.015 percent of Phosphorus, smaller than 0.008 percent of Sulfur, 0.002 to 0.04 percent of Aluminum, 0.001 to 0.01 percent of Calcium, 0.08 to 0.14 percent of Vanadium, the remaining part is Ferrum and other inevitable purities. The air hardening steel of the chemical proportion is adopted, continuously casted to form blank, the normalizing heat treatment is carried out for the entire casing after ERW of casing, and then the oil casing with low yield ratio electrical resistance welding of the invention is fabricated out. The yield strength of the oil casing is between 379 to 552 Megapascal, the tensile strength is greater than or equal to 655 Megapascal, and the oil casing has the moderate carbon equivalent and the stable mechanical property of the entire casing.

The invention relates to a reusable reduced graphene oxide-based photothermal conversion film and a preparation method thereof. The method comprises the steps of firstly connecting a graphene oxide sheet by adopting a crosslinking agent under the action of agitation and ultrasound and then carrying out vacuum suction filtration on the mixed dispersion liquid to a mixed cellulose filter film; and quickly reducing the prepared graphene oxide/mixed cellulose film by using a reducing agent under a microwave assist to obtain the reduced graphene oxide-based double-layer photothermal conversion film. A steam performance test shows that the reduced graphene oxide-based double-layer photothermal conversion film achieves 60% of steam conversion efficiency under illumination of 1Kw/m<2>. A cyclic test result shows that the reduced graphene oxide-based double-layer photothermal conversion film still keeps the stable performance after repeated experiments for 30 times. The prepared photothermal conversion film is capable of directly converting solar energy into steam energy, is high in photothermal conversion efficiency, wide in application prospect, simple in preparation technology and low in cost, and has excellent mechanical stability and reusability.

The present invention provides a manufacturing method of a hot rolling steel plate for an automobile girder. The production method comprises a steelmaking step, a continuous casting step, a heating step, a hot continuous rolling step and a coiling step, and is characterized in that components of the molten steel after steelmaking comprise 0.05-0.1 wt% of C, 0.15-0.35 wt% of Si, 1-2 wt% of Mn, 0.01-0.1 wt% of Nb, 0.03-0.12 wt% of Ti, less than or equal to 0.025 wt% of P, less than or equal to 0.01 wt% of S, and the balance of Fe and unavoidable impurities, a finish rolling temperature in the hot continuous rolling step is 830-900 DEG C, and a coiling temperature is 600-700 DEG C. The present invention further provides the hot rolling steel plate prepared by using the method and provided for the automobile girder. With the manufacturing method, production cost is reduced, and rolling process control is simple. With the hot rolling steel plate for the automobile girder, hot rolling product structures are substantially enriched and improved.

The invention relates to a rotary swaging forming method for automobile aluminum alloy wheel hubs. By utilizing the capability of deformation allowance of a material under a certain temperature, and by the aid of the rotary swaging forming method, an aluminum alloy material is forced to form a shape according to a preset mould shape. The rotary swaging forming method includes: preparing a rough material, cleaning, preheating the rough material (enabling the rough material to be semi-solid), forging and pressing to form a shape, expanding an opening, and rotating and pressing to form a shape. The automobile aluminum alloy wheel hubs manufactured by the rotary swaging forming method are high in yield and stable in mechanical property, mechanical processing quantity and energy consumption for the wheel hubs are obviously lowered, raw material is saved, and production efficiency is improved.

The invention discloses a process for preparing a trace amount mycotoxin molecular imprinted column, which comprises the following steps of: selecting a functional monomer; evenly mixing a mycotoxin template molecule, the functional monomer, a cross-linking agent, a pore-forming agent, an initiator and an organic solvent by a certain molar ratio to prepare a molecular imprinting polymer solution; preparing a nano-solution; and dressing the nano-material and a molecular imprinting polymer on the internal surface of a glass pipe column. A method for detecting the trace amount mycotoxins includes: pumping a chemiluminescence system solution and a sample solution into a chemiluminescence analyzer respectively and detecting the mycotoxins in the sample. The molecular imprinted column of the invention has advantages of high sensitivity and accuracy. The nano-enhanced trace amount mycotoxin molecular imprinted column obtained in the invention is connected to the chemiluminescence analyzer for detecting mycotoxins, and purposes of high specificity, high sensitivity and fast detection to mycotoxins in the sample can be realized.