39results about How to "Uniform mechanical strength" patented technology

The invention discloses a fuel cell leveling layer composition and a preparation method thereof as well as a gas diffusion layer. The leveling layer composition comprises a conducting carbon material, an organic pore creating material, a water retention agent, a solvent and a hydrophobing agent, and the mass ratio of the conducting carbon material, the organic pore creating material, the water retention agent and the hydrophobing agent is 1:0.1 to 0.5:0.5 to 10:0.01 to 1. The leveling layer composition can effectively reduce the poriness on the surface of carbon paper, increase the mechanical strength of the gas diffusion layer and reduce the constriction resistance between a leveling layer and a catalyst layer, and the gas diffusion layer containing the leveling layer composition has higher surface smoothness, good ventilation property and water transmissibility, and no fine cracks.

The invention relates to a manufacturing method for a cold drawn welded pipe used for hydraulic oil cylinders. The manufacturing method includes the steps of: longitudinal shearing, roll bending formation, high-frequency welding, weld joint treatment, sizing, online eddy current flow detection, stress relief annealing, pre-straightening treatment, pipe cutting, normalizing air cooling treatment, pinching, pickling treatment, phosphating treatment, saponification treatment, cold-drawing, induction furnace quenching treatment, box type furnace tempering treatment, straightening treatment, fine boring rolling, magnetic leakage flaw detection, and pipe cutting measurement. The product obtained by the method provided by the invention has the advantages of high yield strength, high tensile strength, precise size, smooth surface, fast machine shaping speed, high yield, and remarkably improved manufacturing precision. The cold drawn welded pipe has good surface smoothness and low roughness, the follow-up gold processing amount is reduced, the steel utilization is improved, the manufacturing cost is lowered, and energy saving and environmental protection are promoted.

The invention discloses a sapphire substrate polishing device and a polishing process. A rotating shaft is rotatably mounted on a frame, a polishing table is fixed to the top end of the rotating shaft, a crystal polishing pad is fixed to the upper surface of the polishing table, an abrasive feeding mechanism is arranged above the crystal polishing pad, a fixing ring is mounted on a mechanical armthrough a rubber wheel, a substrate fixing disk is arranged in the fixing ring, a pressing mechanism for pressing a sapphire substrate fixed by the substrate fixing disk towards the crystal polishingpad is arranged above the substrate fixing disk, the crystal polishing pad is formed by adhering crystal chips of the same thickness onto the upper surface of the polishing table through ultraviolet glue, and the gap between each two adjacent crystal chips ranges from 0.5mm to 2mm. After polishing, the planeness of the sapphire substrate is smaller than 5 micrometers, the surface roughness of thesapphire substrate is smaller than 0.3 nanometer, the surface of the substrate is not provided with complicated products, complicated post cleaning is omitted, cost is saved, and the rate of finishedproducts is increased.

The invention relates to a manufacturing method of a cold drawn welded pipe for a precision oil cylinder. The manufacturing method comprises the following steps: longitudinal shearing, rolling forming, high-frequency welding, tensioning, online eddy current inspection, stress relief annealing, normalizing air cooling treatment, pre-straightening treatment, pipe cutting, pinching, acid washing treatment, phosphating treatment, saponification treatment, cold drawing, induction furnace quenching treatment, tempering treatment in a box type furnace, straightening treatment, honing, magnetic leakage inspection and pipe cutting measurement. A product obtained by the method has the advantages of high yield strength, high tensile strength, precise size, smooth surface, high processing and forming speed, high yield, obviously improved manufacturing precision, good surface smoothness of the cold drawn welded pipe, low roughness, reduced subsequent gold processing, improved utilization rate of steel, reduced manufacturing cost and capability of promoting energy conservation and environmental protection.

The invention relates to a lithium ion battery diaphragm and a preparation method of the lithium ion battery diaphragm. The lithium ion battery diaphragm provided by the invention is divided into three layers, wherein a core layer is a cotton fiber film layer; an upper layer and a lower layer are polypropylene fiber film layers; the core layer of the diaphragm is a film formed by pulping cotton fibers and then performing a wet manufacturing technology on the pulped cotton fibers by using an antioxidant, a fire retardant and the like; each surface layer is a film formed by performing hydrophilic modification on polypropylene fibers and then performing the wet manufacturing technology on the modified polypropylene fibers by using an adhesive; the cotton fiber film is used as the core layer, and the polypropylene fiber films are used as the upper surface layer and the lower surface layer, so that the lithium ion battery diaphragm is prepared by hot pressing by two hot pressing rollers under the condition of 110-150 DEG C. The porosity of the lithium ion battery diaphragm is 40-80 percent, and the aperture is 0.01-0.2 microns; the tensile strength of the lithium ion battery diaphragm in both the longitudinal direction and the transverse direction is basically the same, which is 120-300Mpa; the puncture strength is higher than 20kg.mm<-1>; under 90 DEG C, the shrinkage rate is less than 1 percent; the lithium ion battery diaphragm is 20-60 microns thick. The lithium ion battery diaphragm is uniform in porosity distribution, high in mechanical strength, low in shrinkage rate, high in thermal stability and high in hydrophilicity/liquid retaining performance and is easy to prepare, pollution-free and suitable for industrial production.

The present invention provides a charging member which can maintain excellent wear resistance even though being used repeatedly. In the charging member having a surface layer, the surface layer is a surface layer constituted by at least one selected from silsesquioxanes having structures represented by a compound (1), a compound (2), a compound (3), a compound (4), a compound (5) and a compound (6), and a polysiloxane having a first unit represented by SiO_0.5R¹(OR²)(OR³), a second unit represented by SiO_1.0R⁴(OR⁵) and a third unit represented by SiO_1.5R⁶, wherein the silsesquioxane is contained in the polysiloxane.

The invention belongs to the field of 3D printing material design and preparing and particularly relates to a radial classification porous titanium alloy part and a 3D printing preparing method thereof. The porous titanium alloy part has the beneficial effects of being high in porosity, high in strength, small in mass and the like. The porous titanium alloy part comprises multiple basic units which are tightly arranged. The basic units include unit cells A, unit cells B, unit cells C and unit cells D. The unit cells A serve as the innermost layer of the porous titanium alloy part, and the minimum density and the maximum equivalent hole diameter of the porous titanium alloy part are formed; the unit cells B and the unit cells C serve as the sub inner layers of the porous titanium alloy partin sequence, the middle-grade hole diameter of the porous titanium alloy part is formed, and the unit cells B and the unit cells C serve as the multi-scale smooth transition of the material density of the porous titanium alloy part; the unit cells D serve as the outermost layer, and the minimum hole diameter and the maximum density of the porous titanium alloy part are formed; and therefore a structure where the porous titanium porosity and the equivalent hole diameter are in classification gradual change is formed in the porous titanium alloy part.

The invention provides an oil field negative pressure flowback blockage removal process, and belongs to the technical field of oil well flowback blockage removal. According to the oil field negative pressure flowback blockage removal process, the flowback pump negative pressure flowback blockage removal process is optimized and implemented, and meanwhile the technical problems about blockage removal of stratum impurities and near-well blockage, dredging of a seepage channel and improvement of single-well productivity are solved; and meanwhile, when the process is applied to blockage removal ofnew and old wells on the sea, ship-assisted implementation is not needed, limitation of environmental factors is avoided, flowback well fluid obtained after blockage removal can be directly introduced into a flowback well fluid online treatment device and is fed into the subsequent production process after being filtered, and the process has the remarkable advantages of being low in cost, low inconstruction pressure, low in safety risk point and the like.

The invention provides a negative-pressure flowback blockage removal process for an oil field, and belongs to the technical field of flowback blockage removal of oil wells. According to the negative-pressure flowback blockage removal process for the oil field, the problems of compaction and blockage pollution caused by slurry filtrate invasion and perforation are further solved while the negative-pressure flowback blockage removal process for a flowback pump is optimized and implemented, and the single-well productivity is effectively improved; meanwhile, an acidification blockage removal stepis introduced into the flowback blockage removal process, and pollutants in slurry filtrate in a near-wellbore area are effectively removed; in addition, when the flowback blockage removal process isapplied to blockage removal of new and old wells on the sea, ship-assisted implementation is not needed, the process is not limited by environmental factors, flowback well fluid obtained after blockage removal can be directly introduced into a flowback well fluid online treatment device, and the flowback well fluid is filtered and then sent to a subsequent production process; and the process hasthe remarkable advantages of being low in cost, construction pressure and safety risk point and the like.

The invention relates to the technical field of H05K, and concretely relates to a preparation process and application of a solder resist adhesive layer. The preparation process of the solder resist adhesive layer comprises the following steps: adding a glycol ether substance into a film coating reactant obtained by mixing to enable the viscosity of the film coating reactant to reach 20-20000 cPs, then coating a coating material with the film coating reactant to obtain a wet adhesive layer, and then drying to obtain the solder resist adhesive layer, thereby obtaining the solder resist adhesive layer. The coating reactant comprises acidic photosensitive resin, a polymeric monomer, an initiation reactant, a cured product, a natural filler and a solvent. The solder resist adhesive layer obtained by the invention is high in flatness, uniform in thickness and good in adhesiveness with a circuit board.

The present invention relates to an airplane tire and, particularly, to the crown reinforcement thereof. The airplane tire (1) includes a working reinforcement (2) located radially inside a tread (3) and radially outside a carcass reinforcement (4). The working reinforcement (2) includes at least one working dual ply (21) consisting of two radially stacked working layers (211, 212). The working dual ply (21) consists of the circumferential zigzag winding of a strip (5) having a width W over a cylindrical laying surface (6) with radius R and having, for a rotational axis, the rotational axis (YY') of the tire along a periodic curve (7). The periodic curve (7) has a period P and forms an angle A with the circumferential direction (XX') of the tire within the equatorial plane (XZ) of the tire. The circumferential zigzag winding of the strip (5) includes N periods P of the periodic curve (7) over a number T of circumferences 2 Pi R of the cylindrical laying surface (6). According to the invention, the number N of periods P of the periodic curve (7) is an integer that fits the following conditions: (a) N*(W/sin A)=2*Pi*R; (b) N*P=2*Pi*R*T, where T is an integer, (c) N*T is the lowest common multiple of N and T, and the ratio T/N is 1.8 to 2.2.