64results about How to "Equivalent mechanical properties" patented technology

The invention discloses corrosion-resistant twisted steel and a production method thereof. The twisted steel comprises the following components (weight percentage): basic components, a selective component and remain iron and impurities, wherein the basic components comprise carbon (C) 0.18-0.25%, silicon 0.40-0.80%, manganese (Mn) 0.30-1.00%, phosphorus (P) 0.02-0.04%, sulfur (S)<=0.01%, chromium(Cr) 0.45-1.00% and copper (Cu) 0.05-0.20%, and the selective component is the combination of any one or more than two components of vanadium (V) 0.01-0.05%, niobium (Nb) 0.01-0.04%, nickel (Ni) 0.01-0.20%, titanium (Ti) 0.01-0.05% and boron (B) 5-30ppm. The production process comprises electric furnace or converter smelting, refining out of the furnace, square blank continuous casting, hot rolling, cold bed air cooling, multiple length shearing and an end-flattening procedure which are performed sequentially, the corrosion service life of the corrosion-resistant twisted steel is more than 1.5 times that of a conventional steel product, and production cost, mechanical property, welding performance, processing performance and the like are identical with the conventional product.

Thermoformed articles include cycloolefin/ethylene copolymer and LLDPE. The articles are formed with an areal draw ratio of 1.5 and greater and exhibit unexpectedly elevated stiffness along with ductility suitable for forming deep-draw parts. Multilayer sheet is used for achieving a desired set of properties.

An oriented implantable, biodegradable device is disclosed. The oriented implantable, biodegradable device is formed from a homogeneous polymer blend comprising a polylactic acid in admixture, in an amount of not more than 10% by weight of the polymer blend, with an additive which both plasticises polymer draw and is a degradation accelerant. The polymer comprised within the blend may be a uniaxial, biaxial or triaxial orientation. Also disclosed is a composite thereof, processes for the preparation thereof, and The implantable biodegradable device may be used as a high strength trauma fixation device suitable for implantation into the human or animal body. As examples, the high strength trauma fixation device may take the form of plates, screws, pins, rods, anchors or scaffolds.

The invention discloses a bone screw of a three-dimensional through porous structure. The porous bone screw comprises a screw head, a screw body and a screw cap. The screw body comprises a porous network composed of the three-dimensional through porous structure. The porous bone screw is made of medical materials which can be implanted into a human body, the three-dimensional through porous structure of the porous bone screw provides more space for the growth of bone cells, the combination between the implanted screw and the bone tissues of the human body is promoted, and the anchoring can be firm.

The invention discloses wheel steel for a railway wagon. The wheel steel comprises the following chemical components in percentage by weight: 0.46-0.55% of C, 0.20-0.37% of Si, 0.70-0.85% of Mn, 0.24-0.32% of Cr, 0.020-0.040% of Als, less than or equal to 0.008% of P, less than or equal to 0.008% of S and the balance of Fe and inevitable impurity elements. The invention also discloses a method for preparing wheels by using high-carbon and low-alloy wheel steel for a railway wagon; and the method comprises a heat treatment process; and the heat treatment process comprises the following steps: holding the temperature at 860-880 DEG C for 3-3.5 hours, discharging the wheel steel out of a furnace and cooling the wheel steel with air to room temperature, then holding the temperature at 840-860 DEG C for 4 hours, spraying water to cool a wheel hub for 400 seconds, then holding the temperature at 480-500 DEG C for 5 hours, discharging the wheel out of the furnace and cooling the wheel with air.

The invention provides a composition with improved low-temperature flexibility and elasticity, comprising the components in parts by weight: 30-50 parts of polyvinyl chloride, 20-35 parts of plasticizing agent and 1-15 parts of modifying agent, wherein the modifying agent is selected from an ethane/acrylic ester multipolymer or trimer and an ethane/vinyl acetate multipolymer or trimer. The invention also relates to an application of the composition for manufacturing a door-seal plastic sleeve of refrigerated products and refrigerated products containing the composition.

The invention discloses coated sand for sand prevention in an oil well and a preparation method of coated sand. The coated sand comprises A-type coated sand and B-type coated sand and is characterized in that the A-type coated sand is obtained by wrapping quartz sand with organosilicon-modified epoxy resin, a ketimine curing agent and external isolating agent hydroxy methyl cellulose in sequence; B-type coated sand is obtained by wrapping the surface of the quartz sand with cycloaliphatic epoxide resin, an amine curing agent and external isolating agent hydroxy methyl cellulose in sequence. The coated sand disclosed by the invention comprises the A-type coated sand and B-type coated sand, and a co-synergistic effect is generated after the A-type coated sand and the B-type coated sand are mixed, so that the requirements for low-temperature curing and high-temperature mining are met simultaneously. The coated sand disclosed by the invention meets the actual application requirements, gives consideration to low-temperature curing (a minimum temperature of 40 DEG C) to form higher strength, simultaneously is good in permeability, can stably work in a high temperature-resistant environment (about 280 DEG C), is wide in research and development scope of application, can be suitable for not only heavy oil wells, but also middle and low-temperature oil wells and water wells and is lower in comprehensive cost.

At present, an ultra-fast cooling technology is mainly applied to cooling of steel after two-stage controlled rolling. The invention discloses an optimal controlled rolling method adopting ultra-fast cooling to control an Austenite structure and belongs to the technical field of metallurgy. According to the method, the steel can be completely rolled in a steel billet Austenite recrystallization zone, rolling temperature and pass reduction rate can be simultaneously precisely controlled, an ultra-fast cooling system is immediately adopted to cool the rolled steel to a phase transition point after rolling, and then different cooling paths are adopted according to needs to control the phase transition of the steel. According to the method disclosed by the invention, the ultra-fast cooling is adopted, so that coarsening of the small re-crystallized Austenite structure can be effectively inhibited, and the refining effects of dynamic recrystallization and sub-dynamic recrystallization against the Austenite structure in a high-temperature rolling process can be retained. The product manufactured by the method disclosed by the invention and the steel manufactured by the two-stage controlled rolling process have equivalent mechanical properties, so that the rolling time is simultaneously reduced by 2-4min in comparison with the two-stage controlled rolling process at a waiting temperature and low-temperature atmosphere in the rolling process.

The invention discloses a liquid crystal polymer film and a production method thereof. The liquid crystal polymer film comprises at least two first orientation units and at least two second orientation units, the orientation directions of the first orientation units intersect with the orientation directions of the second orientations, the at least two first orientation units and the at least two second orientation units are arranged in a mesh woven structure, and the mesh woven structure is subjected to hot press molding to obtain the liquid crystal polymer film. The first orientation units and the second orientation units having different orientation directions are arranged in the mesh woven structure, the hot pressing molding is adopted to obtain the isotropic liquid crystal polymer filmwith same mechanical performances in an MD (machine direction) and in an TD (transverse direction), and the obtained film has no layering phenomenon in the thickness direction.

The invention relates to a polyvinyl chloride production method adding a chain extender to match with a later-stage heating process. The production method is characterized in that during the polymerization reaction process, when the polymerization conversion rate achieves 50%-75%, the chain extender is added into a polymerization kettle by a high-pressure pump, the using quantity of the chain extender is 10-10000ppm of the total quantity of polyvinyl chloride, the material temperature in the polymerization kettle is simultaneously increased by 1-25 DEG C, and the temperature increasing speed is 0.2-3 DEG C/min. Polyvinyl chloride resin produced by adopting the production method disclosed by the invention has a larger molecular weight distribution width index than that of the resin with the same number-average molecular weight and further keeps the excellent processing performance of the resin produced by a pure polymerization later-stage heating process; and simultaneously, the impact strength and tensile strength of a simply supported girder gap of a product are higher than those of the resin produced by adopting the pure polymerization later-stage heating process and equivalent to those of the resin produced by a constant-temperature polymerization process, and good resin processing performance and great product mechanical performance are further realized.

The invention discloses a union melt welding process for steel Q420GJC for building structures. Welding materials include a welding wire MCJ55GJ with a diameter being phi 4.0mm and a welding flux SJ101; a welding environment temperature is higher than or equal to -10 DEG C; a preheating temperature is 100-150 DEG C; multi-layer and multi-pass welding are adopted, and an interlayer temperature is not lower than the preheating temperature. Conditions of backing weld include that a welding current is 520-530A, a welding voltage is 28-30V, a welding speed is 34-35.5cm/min, and thermal input is 21.3-22.8KJ/cm. Conditions of filling weld include that a welding current is 530-540A, a welding voltage is 30-32V, a welding speed is 36-37cm/min, and thermal input is 22.5-23.8KJ/cm. Conditions of cosmetic weld include that a welding current is 535-545A, a welding voltage is 28-30V, a welding speed is 34-35cm/min, and thermal input is 22.4-23.8KJ/cm. By the union melt welding process, equality in mechanical property of welds and base materials can be realized so as to meet requirements on engineering welding quality, and a gap of union melt welding of the steel Q420GJC is filled.

The invention provides a testing device for the mechanical properties of an inner yarn of a ceramic matrix composite material. The device comprises test machine chunks, an upper round bar, a force sensor, U-shaped clamp blocks, pins, reinforcing pieces, a fibre bundle with a base body, a lower round bar and an extensometer. There are two test machine chunks respectively clamp the upper round bar and the lower round bar; the upper round bar is connected with the U-shaped clamp blocks through the force sensor, and the lower round bar is connected with the U-shaped clamp blocks; there are two U-shaped clamp blocks which are connected with the reinforcing pieces through the pins; there are two reinforcing pieces respectively connected with the two ends of the fibre bundle with a base body; theforce sensor and the extensometer are connected with a data collection system through data lines. The testing method based on the device comprises the steps of: preparing the fibre bundle with the base body, fixedly installing the fibre bundle with the base body on the testing device, the pull-up test is performed on the test machine, and the force sensor and the extensometer are employed to measure and obtain the mechanical properties such as elastic modulus and strength of the fiber bundle with the base body.

The invention belongs to the technical field of macromolecular materials, and particularly relates to a preparation method of recyclable thermosetting polyimide. The preparation method of recyclable thermosetting polyimide includes the steps that firstly, an amine end capping method is adopted to obtain polyimide oligomers with active reaction amino groups, and then a cross-linking agent containing multiple aldehyde groups is adopted to conduct cross-linking condensation to obtain thermosetting polyimide. Thermosetting polyimide prepared through the preparation method maintains excellent performance of polyimide and can be recycled and reprocessed; not only can thermosetting polyimide prepared through the preparation method be decomposed and recycled, but also recycled monomers still can be recycled again, a material obtained after the recycled monomers are polymerized again still has the same mechanical performance as the raw material, and the preparation method is mainly applied to recycling and the like of composite materials; the vitrification transformation temperature of thermosetting polyimide prepared through the preparation method is greater than 200 DEG C, and thermosetting polyimide can be applied to severe environments such as high-temperature environments.

The invention discloses a preparation method of a swimming bladder bioprosthetic valve material and a preservation method thereof. The preparation method comprises the following steps: a, cutting anddecellularizing swimming bladders; b, carrying out cross-linking immobilization on the decellularized swimming bladders by adopting glutaraldehyde; c, carrying out cross-linking post-treatment by adopting a polyphenol glycosaminoglycan enzyme inhibitor or carrying out cross-linking post-treatment by adopting a polyphenol compound and ferric chloride; and d, after rinsing, preserving by adopting anantibacterial solvent or preserving after dehydrating and drying by adopting an alcoholic solution. According to the swimming bladder bioprosthetic valve material prepared by the invention, the stability and the anti-calcification performance of glycosaminoglycan are improved, and the swimming bladder bioprosthetic valve material is the novel bioprosthetic valve material with an application prospect.

The invention discloses a liquid crystal polymer film and a manufacture method. The liquid crystal polymer film comprises first oriented films and second oriented films, wherein the first oriented films and the second oriented films are in sequentially staggered and laminated arrangement; the orientation directions of the first oriented films and the adjacent second oriented films intersect with each other, and the first oriented films and the second oriented films are subjected to hot press molding to obtain the liquid crystal polymer film. The liquid crystal polymer film has considerable mechanical properties in the MD direction and the TD direction, thereby being applicable to manufacture of flexible circuit boards; the manufacture method of the liquid crystal polymer film is simple, the manufacture cost is low, and the liquid crystal polymer film is easy to produce in a large scale.

The invention provides a fabric punched felt complex and a preparation method thereof. The preparation method comprises the following steps: compounding a continuous functional fiber fabric layer and a continuous functional fiber bulked yarn crude fabric layer together so as to obtain integrated fabric; then compounding a chopped functional fiber punched felt layer with the continuous functional fiber bulked yarn crude fabric layer of the integrated fabric through needling so as to obtain the fabric punched felt complex. The fabric punched felt complex has a light and high strength structure with stepped intensity changes. The weight of the fabric punched felt complex is 30% lighter than that of complete fabric with a same volume, while the mechanical performance of the fabric punched felt complex is equal to that of complete fabric with a same volume, and is better than that of complete chopped fiber punched felt. At the same time the fiber raw material is saved by 30% or more, moreover the preparation technology is simple, and the production period is short.

The invention relates to a manufacturing method of an optical cable strengthening piece, and belongs to the technical field of composite material processing. The manufacturing method is characterized in that a strengthening fiber is a glass fiber or a para-position aramid fiber, and a resin is a thermoplastic resin. The manufacturing method comprises the steps of putting yarns, soaking by a coupling agent, preheating and drying the fiber, coating the resin, cooling, drying and rolling the resin and the like. The optical cable strengthening piece prepared by the invention has the advantages that the flexibility is greatly improved, the production speed is rapid, the benefits are high, the cost is low, a fiber disconnecting condition is avoided, and the manufacturing method of the optical cable strengthening piece can be used on a large scale.

The invention provides a high thermal conductivity and high strength carbon-based composite material and a preparation method thereof and belongs to the technical field of manufacturing of carbon materials. The high thermal conductivity and high strength carbon-based composite material comprises at least two layers of carbon/carbon composite material plates which are laminated, and two adjacent layers of the carbon/carbon composite material plates are adhered by a silicon adhesive. As for the high thermal conductivity and high strength carbon-based composite material provided by the invention,the thermal conductivity is more than 450W/mK, the tensile strength and the compressive strength are more than 250MPa respectively, and the bending strength is more than 200MPa. Compared with an aluminum alloy material which is currently used for a heat dissipation panel of a spacecraft thermal control system, the mechanical performances of the material are comparable, but the mass is lighter andthe thermal conductivity is much higher than that of the aluminum alloy. Thus, the high thermal conductivity and high strength carbon-based composite material is expected to be widely applied in thefields of spacecraft thermal control, thermal management of electronic devices and the like.

The invention discloses a preparation method of a composite zirconia ceramic backboard. The method comprises steps as follows: composite zirconia granulation powder is poured into a backboard mold andsubjected to dry-pressing molding, an obtained model is subjected to degreasing, high-temperature roasting and flash burning, and a backboard sintered body can be prepared. The preparation method ofthe composite zirconia ceramic backboard is combined with high-pressed sintering and flash burning technologies, the temperature of the high-temperature roasting of the method is lower than that of the high-pressed sintering technology by 500-700 DEG C, the total time for high-temperature roasting does not exceed two minutes, and the obtained backboard sintered body not only has mechanical properties equivalent to those of a product obtained with the high-pressed sintering technology, but also has the characteristics of being compact in structure and free of microscopic hole defects; besides,the method further has the advantages of simple and controllable process, efficient preparation and relative energy conservation, and is suitable for industrial production.

The invention discloses an alloy zinc bar preparation method which includes the steps: smelting copper, titanium and zinc in an industrial furnace; gradually adding zinc ingot until component requirements are met; adding refining agents, mixing and refining; keeping temperature for melted liquid after refining, and controlling the temperature within a range from 450 DEG C to 500 DEG C; squeezing out alloy zinc bars by the aid of a pressurized mode. The weight percentage of the copper is 0.1-2%, the weight percentage of the titanium is 0.05-0.1%, and the balance being zinc. The alloy zinc bars prepared by the method can be drawn into different lengths, diameters and shapes according to requirements, mechanical properties and corrosion resistance of the alloy zinc bars are equivalent to those of brass bars, and cost is greatly reduced.

The invention discloses a 3D printing nozzle and a forming method of a liquid crystal polymer film. The 3D printing nozzle comprises a shell and further comprises an inner core. The inner core is located in the shell. The central axis of the inner core coincides with the central axis of the shell. The inner core is rotatably arranged relative to the shell. The inner core of the spray nozzle is rotatably arranged relative to the shell. When a melt is subjected to mixing and plastifying, the forming pressing can be increased, and a raw material is transformed well from zero dimension to three dimension. When the liquid crystal polymer film is formed through the spray nozzle, the problem of orientation of the liquid crystal polymer film on a 2D plane can be improved remarkably, and the mechanical properties of the obtained liquid crystal polymer film in all directions are equivalent.

The invention discloses a preparing method of an alloy magnesium rod. The preparing method comprises following steps that copper, sodium and magnesium are added into an industrial furnace to be smelted; a magnesium ingot is added step by step until the component need is achieved, the mass percent of the copper is 0.1 to 2%, the mass percent of the sodium is 0.05 to 0.1%, and the balance is magnesium; a refining agent is added, and stirring refining is carried out; the refined alloy melt is subjected to heat preservation, and the temperature is controlled to range from 450 to 500 DEG C; and through pressurized extrusion, the alloy magnesium rod is obtained. The alloy magnesium rod obtained through the preparing method can be drawn into different lengths, diameters and shapes according to needs, the mechanical property, and corrosion resistance of the magnesium rod are equivalent to those of the brass rod, and the cost is greatly reduced.