120results about How to "Release internal stress" patented technology

The invention provides a preparation method for a radiation-oriented magnet ring or a multipolar magnet ring, which comprises the following operation steps of: preparing an alloy ingot, cracking the alloy ingot, pressing under a radiation-oriented magnet field, sintering the magnet ring and subsequently machining and is characterized in that a powder pre-orientation step is also arranged before the step of pressing under the radiation-oriented magnet field, powder is first filled in a die cavity of a forming press, and pre-orientation operation is then carried out on the powder. Before the step of sintering the magnet ring, a step of preprocessing a blank is also arranged. Preprocessing operation is carried out on the blank magnet ring under protective atmosphere. The orientation degree of the magnet ring can be further improved under the condition that the die structure is not changed, so that the purpose for improving the magnetic performance of the magnet ring is achieved. Meanwhile, sintering crack problems resulting from nonuniform contraction caused by the internal stress of the magnet ring in the sintering process can be effectively solved, and the sintering finished product rate of the magnet ring can be obviously improved.

The invention specifically relates to X80 pipeline steel with the high stress ratio and high arrest toughness and a preparation method and application of the X80 pipeline steel. The X80 pipeline steel is composed of, by weight, 0.03% to 0.08% of C, 0.15% to 0.35% of Si, 1.50% to 2.00% of Mn, not larger than 0.010% of P, not larger than 0.003% of S, 0.04% to 0.08% of Nb, 0.015% to 0.025% of Ti, 0.015% to 0.025% of Zr, not larger than 0.03% of Mo, not larger than 0.35% of Cu, not larger than 0.30% of Ni, not larger than 0.30% of Cr and the balance Fe and inevitable impurities. Zirconium is added to promote precipitation of proeutectoid ferrite, the banded structure level is reduced, and the stress ratio and the arrest toughness of a steel plate are effectively improved. The heating temperature is strictly controlled, and the recrystallization deformation temperature section in a rough rolling stage and the rolling reduction and the temperature of the last phase of rough rolling are reasonably matched, so that the austenite grain size is reduced to the maximum degree; and a rough-rolled intermediate billet is cooled, so that grain growth generated after recrystallization deformation is reduced.

The invention belongs to the technical field of track materials, and particularly relates to a preparation method for anti-aging composite materials of sleepers. According to the preparation method, bentonite, mica and titanium dioxide are mixed and ball-milled, dispersed into modified liquid and then stirred at a high speed to uniformly fill wood fiber cells subjected to enzymolysis treatment, the interiors of the wood fiber cells are fully swelled and filled, and therefore the effect of physically shielding ultraviolet light is achieved, the penetration rate of the ultraviolet light in the wood is effectively reduced, and the anti-aging performance of the wood material in an ultraviolet light environment is improved. Meanwhile, the wood material is subjected to hot pressing treatment, and due to high temperature and enzymolysis treatment, fibers of wood residues are fully hydrolyzed; and due to the fact that the internal cellulose cells are filled with the filler, the thickness swelling rate of water absorption is effectively reduced, redundant internal stress in the materials is released, and the aging resistance of the composite materials of the sleepers is greatly enhanced.

The invention discloses a method for preparing high-strength carbon fibers, and belongs to the filed of new material preparation. The invention aims to provide the method for preparing the high-strength carbon fibers. The method prepares the high-strength carbon fibers from polyacrylonitrile precursor fibers through sulfanilamide solution chemical modification, physical modification, preoxidation, low temperature carbonization and high temperature carbonization in turn. The method provided by the invention has simple and convenient operation and low cost, and the prepared carbon fibers have high tensile strength.

The invention relates to a production method of a crossed multi-barrier-layer co-extruded film. The production method comprises the following steps: blowing out a film bulb through an extruder and a die head, wherein the innermost layer material of the film bulb is a self-adhesive material, feeding the film bulb into a heating pinch roller, pressing the cylindrical film bulb into a double-layer flaky structure, sticking the double-layer flaky structure into an integral structure through the self-adhesive material after heating the double-layer flaky structure through the heating roller, and then, cooling and rolling so as to obtain the crossed multi-barrier-layer co-extruded film. The thickness of the crossed multi-barrier-layer co-extruded film, namely a sheet material, prepared by the production method is even, and production requirements and quality requirements are met. Surface treatment including gravure, flexographic printing, offset printing, gold stamping and the like can be carried out. A symmetrical structure is formed in each layer, so that barrier layers and functional layers are all doubled, the thickness is doubled, and the sheet material meeting the production requirements is prepared. The doubled barrier layers and functional layers can promote the sheet material to have better barrier performance, and the product performance of the sheet material is improved.

The invention discloses an LED quantum well structure, a manufacture method of the same, and an LED epitaxial wafer comprising the same. The structure comprises: a first GaN barrier layer arranged on an n-type GaN layer in an LED; a first buffer layer arranged on the first GaN barrier layer and including a first InGaN layer and a first GaN layer arranged alternately; a second GaN barrier layer arranged on the first buffer layer; a second buffer layer arranged on the second GaN barrier layer and including a second InGaN layer and a second GaN layer arranged alternately; and a quantum well light emitting layer arranged on the second buffer layer and including a third InGaN layer and a third GaN layer arranged alternately. The In concentration of the third InGaN layer is greater than that of the second InGaN layer and greater than that of the first InGaN layer. The crystal quality of the quantum well light emitting layer of the structure is improved.

The invention discloses a PVC plastic plate special for stone compounding. The PVC plastic plate is prepared from, by weight, 100 parts of PVC, 20-90 parts of light calcium carbonate, 0.1-30 parts of wood flour, 0.001-20 parts of polylactic acid and 20-50 parts of PVC processing agents; the PVC processing agents include a lubricating agent, an anti-shocking modifier, a foaming agent and a foaming modifier and further include one or more of a lubricity processing agent, a PVC processing modifier, a stabilizer, a reinforcing agent, barium sulfate and titanium dioxide. The wood flour and polylactic acid are added and have a synergistic effect of improving tenacity and brittleness of the PVC plate, and in addition, polylactic acid is beneficial for improving the tensile strength of the PVC plate. The invention further discloses a production method for the PVC plastic plate special for stone compounding and a natural stone plastic compound plate produced from the PVC plastic plate.

The invention relates to a PET (polyethylene) sheet three-dimensional molding process and a counter pressure thermal molding mould. By improving a molding mould and adjusting thermal molding machine tool parameter, the PET sheet three-dimensional molding processing is realized. The molding mould comprises an upper module and a lower mould; the lower mould comprises a mould core, a pressure plate and a lower formwork; the mould core is fixed on the lower formwork, the pressure plate is in threaded connection with the lower formwork through an unloading bolt on which a spring is sleeved, the pressure plate is provided with a locating pillar, the lower formwork is provided with a guide pillar, the pressure plate is in sliding fit with the guide pillar and the mould core, the upper mould and the lower mould are in mould assembling or de-mould fit. By heating and assembling the PET sheet, and adopting a step of continuously and repeatedly pressurizing and maintaining pressure, the internal stress of the PET sheet is released to maximally reduce the resilience, thereby solving the problems that the PET sheet is hard to mold and great in resilience; the PET sheet with strong resilience can achieve a stable three-dimensional effect and meets various demands of clients.

The present invention relates to a preparation method for a hose sheet by multilayer co-extrusion. The method is characterized by: using an extruder and a die orifice to blow bubble by multilayer co-extrusion, wherein the bubble has a 5-11 layer structure, the bubble at least comprises a self-adhesive material layer, and an innermost layer is the self-adhesive material layer; and a cylindrical bubble being laminated into a double-layer sheet structure when the bubble entering into a heating nip roller, the double-layer sheet structure passing through the self-adhesive material layer to adhere to an integrated structure by a heating roller, and through cooling and rolling to obtain the hose sheet, wherein layer number of the hose sheet is two times of the layer number of the bubble. The hose sheet prepared by the method is uniform in thickness, and components of each layer can be adjusted according to the performance requirements of the hose; each layer of the hose sheet forms a chiral symmetry structure, thereby doubling the quantity of function layers with a better functional property; and the thickness of the film can be doubled to 100-460 [mu]m, and the thickness thereof can meet the hose production requirements.

The invention relates to optical fiber with a large effective area. The mold field diameter of the optical fiber at the 1550 nm position is 12.0-13.6 micrometers, and the mold field area is larger than or equal to 120 square micrometers; the optical fiber sequentially comprises a core layer, cladding layers and coating layers, the core layer is a silicon dioxide glass layer with the radius of 5-7 micrometers, an inner cladding layer is a fluorine-doped inner cladding layer, the relative refringence difference is -0.4--0.2 %, the radius r3 of the middle cladding layer is 12-25 micrometers, and the outer cladding layer is a quartz glass layer with the radius r4 of 25-45 micrometers; the coating layers include an inner coating layer and an outer coating layer, the diameter of the inner coating layer is 192 micrometers, and the diameter of the outer coating layer is 245 micrometers. The cut-off wavelength, the bending loss, chromatic dispersion and other comprehensive performance parameters in the application wave band are good, the optical fiber can be used as long-distance optical fiber communication under bad conditions such as super crossing gobi and deep sea, the circular degree of all layers of the optical fiber is good, the round formed shape is ensured, and strain of the optical fiber can reach 2% or more.

The invention discloses microwave-treated dyed decorative veneer and a preparation method thereof. The preparation method comprises the following steps: first performing high-intensity microwave treatment of large-size wood; then dyeing the microwave-treated wood with a dye; drying the dyed wood and then soaking the dried wood in a resin-based adhesive or a bio-based adhesive; next preparing the wood into microwave-treated dyed wood by hot pressing or cold pressing; and finally planning the microwave-treated dyed wood to prepare the microwave-treated dyed decorative veneer. Through the microwave-treated dyed decorative veneer and the preparation method thereof, the difficult problems of poor dye liquor permeability, insufficient dye liquor penetration depth, poor physical and mechanical properties of decorative veneer and poor dyeing effect uniformity in a large-size wood dyeing process are solved. The microwave-treated dyed decorative veneer and the preparation method thereof are applicable to the fields of furniture, floor, decoration and finish.

The invention relates to a preparation method of an anti-hollowing high-adhesion strength tile adhesive, and belongs to the technical field of preparation of decorative materials. The preparation method is characterized by taking ceramic tile polished residue which is prepared from the main components of silicon carbide, magnesium oxide, magnesium chloride and tile fine powder as a raw material, mixing the raw material with absolute ethanol, carrying out wet grinding, oxidizing by using potassium permanganate after wet grinding, fermenting and modifying by using lemon juice, and finally carrying out dehydration reaction, thus obtaining reaction filter residue; then carrying out soda boiling on rice straw by using slaked lime, and sealing for fermenting, thus obtaining rice straw ribs; blending the reaction filter residue, the rice straw ribs and other auxiliary materials, thus finally preparing the anti-hollowing high-adhesion strength tile adhesive. The anti-hollowing high-adhesion strength tile adhesive prepared through the preparation method is very good in adhesion strength and flexibility, is not easy to generate hollowing and has a wide application prospect.

The invention discloses a complex plating solution, and a preparation method and application thereof. The complex plating solution comprises a tin plating solution containing nickel nanoparticles or nickel nanowires. In case of plating by use of the complex plating solution, the nickel nanoparticles or the nickel nanowires are co-deposited with pure tin to form a complex plating. In the complex plating, the nickel nanoparticles or the nickel nanowires can be embedded into the crystal lattices of tin, effectively releasing the internal stress of the plating, thus reducing the internal driving force for tin whiskers to grow to effectively inhibit the growth of the tin whiskers, and with the mature preparation of nickel nanoparticles or nickel nanowires, the complex plating solution is convenient to obtain, and has a good application prospect.

The invention provides a preparation method of a cobalt disulfide/carbon nanofiber composite material, comprising the following steps: S1A) carbonizing a polyacrylonitrile/polystyrene composite nanofiber membrane to obtain a carbon nanofiber membrane; S1B) mixing cobalt salt of organic acid, organic sulfur source and diol solvent to obtain mixed solution,the organic sulfur source containing aminogroups; S2) mixing the carbon nanofiber membrane with the mixed solution and hydrothermally reacting to obtain a cobalt disulfide/carbon nanofiber composite material. As that carry of the cobalt disulfide material, the multi-channel carbon nanofibers of the invention can enhance the conductivity of the cobalt disulfide and provide an effective buff space for the volume change of the cobalt disulfide; and compared with the prior art, the multi-channel carbon nanofibers of the invention can enhance the conductivity of the cobalt disulfide and provide an effective buffer space for the volume change of the cobalt disulfide; Moreover, the self-assembled nanofibers formed a wrinkled cobalt disulfide nanolayer structure on the surface of carbon nanofibers, which has a large specific surface area,which is conducive to the exchange and transfer of sodium ions and electrons, and also conducive to the electrolyte immersion, and enhances the electrochemical properties of the composite materials.

The invention discloses a preparation method of a heat-resistant CrMoV steel casting part. The steel casting part comprises the following main chemical components in percentage by weight: 0.12-0.20% of C, 0.20-0.60% of Si, 0.5-0.9% of Mn, not greater than 0.020% of P, not greater than 0.012% of S, 1.0-1.5% of Cr, 0.9-1.2% of Mo, 0.1-0.5% of Ni, 0.20-0.35% of V, and the balance iron and residual elements; the steel casting part prepared through the abovementioned components is treated by normalizing and tempering. The method for producing the casting part is applicable to the production of thecasting part used in high-temperature environment, such as a gas turbine casting part; the produced casting part is high in high-temperature lasting mechanical performance and meets the requirements on the mechanical performance under normal temperature and high temperature.

The invention belongs to the field of dentistry, and particularly relates to a dlp type 3d printing photocuring material for a clinical dental temporary crown, which takes nano organic-inorganic hybrid UV resin, high-strength aliphatic urethane acrylate, high-toughness aliphatic urethane acrylate and a free radical acrylate monomer diluent as main bodies and is matched with an inorganic silver antibacterial agent and a pigment, the dLp type 3D printing photocuring material for the clinical dental temporary crown is prepared from a 385nm wavelength free radical system composed of a photoinitiator, and the problems of poor material performance stability, poor size stability, poor toughness, poor mechanical property, medical risk and the like are effectively solved by using a special printingprocess and a post-treatment process.

The invention discloses a gallium arsenide semiconductor substrate wet etching process comprising the following step of: (1) pasting a gallium arsenide semiconductor substrate having subjected to previous processing on a sapphire carrier; (2) mechanically thinning the gallium arsenide semiconductor substrate in the step (1); immersing the gallium arsenide semiconductor substrate in the step (2) in etching liquid to be subjected to chemical corrosion; (4) taking out, cleaning, and drying the chemically corroded gallium arsenide semiconductor substrate and directly performing later photoetching and subsequent processing on the gallium arsenide semiconductor substrate. The gallium arsenide semiconductor substrate wet etching process is simple in steps, good in operability, low in processing cost, may remove damaged crystal processing surface and releasing internal stress, does not need to purchase professional processing equipment and install a matching chemical waste processing system, greatly shortens later processing technological processes, benefits an increase in production power, reduces production cost, and enhances product price competitiveness.

The invention relates to a high temperature-resistant nanosized self-adhesive optical protective film and a production method thereof. The self-adhesive optical protective film comprises a self-adhesive layer, an intermediate layer and an unwinding layer, wherein the self-adhesive layer comprises metallocene polyethylene elastomer resin, soft rubber resin and ternary polymerized polypropylene resin at a mass ratio of (70-80):(10-20):(5-15), the intermediate layer includes high-density polyethylene resin, linear low-density polyethylene resin and low-density polyethylene resin at a mass ratio of (25-35):(35-45):(25-40), and the unwinding layer includes block polypropylene resin and a fluorine-containing auxiliary agent at a mass ratio of (90-98):(2-10). The self-adhesive optical protectivefilm is produced in a multi-layer coextrusion tape-casting mode, and has the excellent properties of high temperature resistance, no shrinkage, repeated sticking and no precipitation.