59results about How to "No brittle fracture" patented technology

Provided is a flexible pressure sensor using graphene as the electrode material. Two outer flexible film layers are doped PCL electrospun films with graphene micro-sheets of which the average radial size is higher than 5-10 microns. Two electrode layers are conductive ink containing graphene micro-sheets with large radial size and nano-silver particles with minimal agglomeration. A dielectric layer is electrospun from nano-fibers. A preparation method for preparing the flexible pressure sensor and a special preparation device are further provided.

The invention relates to a preparation method for an environmentally-friendly TPU. The preparation method comprises the following steps: mixing polyether polyol with polyester polyol, carrying out pressure-reduced distillation to remove moisture therein, then adding hexamethyldiisocyanate, and carrying out a reaction at 37 DEG C under nitrogen protection for 40-45 min to obtain a prepolymer A; adding a catalyst into the prepolymer A, carrying out a reaction at 45-48 DEG C for 20-15 min, then adding a composite additive, carrying out stirring treatment for 40-50 min so as to obtain a prepolymerB; and adding a chain extender into the prepolymer B, carrying out a reaction at 70-72 DEG C for 55-70 min to obtain a polyurethane elastomer. The TPU of the invention has good processing properties,and is not significantly reduced in performance during molding process, free of toxicity to environment and human beings and improved in environmental safety.

The invention relates to a mechanical processing device and a method of ceramic-based complex curved surface parts with wave transmissivity. Most of parts of an aircraft are products with complex curved surfaces, the design and production cycle is long, and the processing workload accounts for more than 65% of that of the whole system; and a wave-transmitting radome has the characteristics of small dimension, compact structure and the like as a key part of a fairing of the aircraft, thereby affecting the flight performance of the aircraft. The device comprises a water storage tank (1), wherein a padding block (2) is arranged in the water storage tank, a workpiece (3) is mounted in the middle of the padding block, a fire poker (4) with a long circular hole is arranged on the padding block (2), the fire poker is fixed on the padding block by using a bolt (5) when pressing the processed workpiece, a water outlet (6) is formed below one side outside the water storage tank, and a water inlet (7) is formed above one side outside the water storage tank. The device is used for SiO2 fiber- toughened SiO2 ceramic-based composite materials, in particular to mechanical processing of the ceramic-based complex curved surface parts with the wave transmissivity.

Disclosed herein is a battery module including battery cells, electrode terminals of which are electrically connected to each other via a connecting member, wherein each of the battery cells is configured to have a structure in which an electrode assembly is mounted in a battery case made of a laminate sheet including a metal layer and a resin layer, and plate-shaped electrode terminals protrude from the battery case, the electrode terminals include a first electrode terminal and a second electrode terminal made of dissimilar metals, the connecting member includes a main connecting part, to which the first electrode terminal is welded, the main connecting part including the metal of the first electrode terminal, and a buried connecting part, to which the second electrode terminal is welded, the buried connecting part including the metal of the second electrode terminal, the buried connecting part is buried in the main connecting part in a state in which the buried connecting part is exposed at one surface of the main connecting part such that the buried connecting part has the same height as the main connecting part to form an even surface, and the first electrode terminal and the second electrode terminal are welded respectively to the main connecting part and the buried connecting part at one surface of the main connecting part at which the buried connecting part is exposed.

The invention discloses a Si3N4 foam ceramic reinforced aluminum-based composite material and a preparation method and an application thereof. The composite material comprises an aluminum matrix and Si3N4 foam ceramic; and the Si3N4 foam ceramic comprises a Si3N4 foam ceramic skeleton and columnar beta Si3N4 crystal grains which grow on the hole wall of the Si3N4 foam ceramic skeleton in situ, thealuminum matrix uniformly fills pores of the Si3N4 foam ceramic skeleton, and the columnar beta Si3N4 crystal grains are coated with the aluminum matrix. The preparation method of the composite material comprises the following steps that liquid metal aluminum is pressed into the pores of the Si3N4 foam ceramic skeleton by adopting a vacuum air pressure infiltration process so as to obtain the Si3N4 foam ceramic reinforced aluminum-based composite material. The Si3N4 foam ceramic reinforced aluminum-based composite material has the advantages of being good in toughness and erosion resistance,good in mechanical processing performance and the like. The preparation method is simple in process and suitable for batch production.

The invention belongs to the technical field of metal material manufacturing, and particularly relates to a thorium tungsten wire used for winding a microwave oven magnetron and a manufacturing method of the thorium tungsten wire. The thorium tungsten wire is characterized by comprising 0.5-1.5% of thorium oxide, 0.0020-0.0080% of potassium and 97-98% of tungsten. Compared with the prior art, the thorium tungsten wire and the manufacturing method have the advantages that (1) according to the thorium tungsten wire, though 0.0020-0.0080% of the potassium is added, thorium oxide particles are still fine and uniform; (2) the thorium tungsten wire contains microelement potassium in content, after coils of the microwave oven magnetron wound through the thorium tungsten wire are carbonized at a high temperature, crystal grains cannot grow larger easily, organization stability is maintained, and the situation that the microwave oven magnetron cannot break due to shaking in the packaging and delivery transportation processes after being produced is guaranteed.

The invention discloses a polylactic acid-based thermoplastic polyurethane modified polylactic acid composite material and a preparation method and application thereof in 3D printing consumables, which belong to the technical field of 3D printing. The material comprises the following raw material components in parts by mass: 60-90 parts of polylactic acid, 3 to 20 parts of polylactic acid-based thermoplastic polyurethane, 1-5 parts of an inorganic filler, 1-5 parts of a cross-linking agent, and 0.2 to 1 part of a stabilizing agent. The structural general formula of the polylactic acid-based thermoplastic polyurethane is shown in the specification, and a group R1 in the structural general formula is selected from polyalkyl ether, the group R2 is selected from one of straight-chain hexyl ormethane diphenyl, and the mesh number of the inorganic filler is 3000 to 5000 meshes. The composite material is good in 3D printing performance and high in printing precision.

The invention relates to a grinding agent for dental ceramic materials, comprising, based on weight percent, the following ingredients: 10%-40% of grinding materials; 0.1%-0.8% of a surfactant; 1%-10% of a brightening agent and deionized water as the balance. The invention has the following technical effects that: 1) the grinding agent has great dispersity and uniform particle size distribution, and can efficiently reduce scratches on the surface of the grinded dental ceramic materials while enhancing the brightness; 2) adding the surfactant can effectively control the uniformity of grinding and polishing during the course of working and lessen the defects on the surface; in addition, the polishing rate can be improved dramatically and the polishing process is free from the brittle fracture of the dental ceramic materials; 3) adding the brightening agent in the process of processing the dental ceramic materials can advance the brightness on the surface of the polished dental ceramic materials and naturalize the color thereof, thus meeting exquisite beauty appreciating demands of people; 4) the grinding solution of the invention is neutral and has good chemical stability and ideal usage safety.

The invention discloses a design method of a steel sleeve crack arrestor for a high-grade steel gas pipeline, which comprises the following steps: calculating a pressure reduction wave curve and a material resistance curve under the service condition of the pipeline according to pipeline technical indexes, and calculating the fracture speed Vf of the pipeline under the working condition through the pressure reduction wave curve and the material resistance curve; changing the fracture resistance f in the material resistance curve, and obtaining the minimum fracture speed Vmin of the pipeline inthe crack arresting process through calculation according to the tangent point of the pressure reduction wave curve and the material resistance curve; judging whether the current steel sleeve crack arrestor design method is applicable or not; selecting crack arrest equipment, DWTT shearing area requirement and clearance degree; calculating the thickness of the steel sleeve crack arrestor; and calculating crack arrestor length. The invention provides the design method of the steel sleeve crack arrestor for the X80/X90 gas pipeline, and the steel sleeve crack arrestor designed by the method canrealize the crack arrestor function of high-speed crack expansion through verification of a full-size gas explosion test.

The invention discloses a preparation method of fresh-keeping rice noodles. The method includes process steps of soaking rice; grinding the rice into pulp; steaming the rice noodles; pressing the ricenoodles; re-steaming the rice noodles; cooling the rice noodles; drying the rice noodles; and packaging the rice noodles. The preparation method is characterized in that: (1) in the process step of grinding the rice into pulp, an edible water-retaining agent and an edible strengthening agent are added, and water and rice starch in rice the pulp are formulated according to a proportion of 1:2.5; (2) in the cooling step, a preservative is added to a used cooling liquid, the ratio of the preservative to the cooling liquid is 90-110:1, and the cooling temperature is maintained at 20-50 DEG C; and(3) after a product is packaged, a sterilization process step is added, and sterilization treatment is performed by utilizing a pasteurization method. The fresh-keeping rice noodles prepared by the preparation method of the invention are convenient to eat, are easy to carry, can be stored at a room temperature for a long time, have no strip in appearance and no brittleness, is good in elasticity,is consistent in taste with fresh rice noodles, is low in processing and packaging cost, and reach the standard of microbiological indicators. The preparation method is low in investment, is low in cost, is obvious in effect, is reliable in quality and fresh-keeping function, and is harmless to a human body.

The invention relates to the technical field of casing nipples, and discloses a special casing nipple for an oil well. The special casing nipple for the oil well comprises a casing nipple, wherein thetwo ends of the casing nipple are separately provided with outer threads; the outer sides of the outer threads are in threaded connection to connecting casings; threaded holes are formed in the middle parts of the outer threads; anti-slide layers are arranged outside the connecting casings; the two ends of the casing nipple are separately provided with end rings; the two sides of each end ring are separately provided with jacks; and the inner sides of the two ends of the casing nipple are separately provided with inner threads. According to the special casing nipple disclosed by the invention, the connecting casings, the jacks and bolts are used for connecting the casing nipple to an oil extraction tube, and the connecting casings are rotated in a direction towards the joint of the two while the casing nipple is connected to the oil extraction tube, so that the threaded holes in the connecting casings correspond to the jacks; the bolts are inserted for fixing, connecting strength between the casing nipple and the oil extraction tube is remarkably improved, and a tube body is pressed to have a breaking phenomenon, and therefore, stability and reliability of the device are improved.

The invention relates to a polyethylene pipe composite material. The polyethylene pipe composite material is characterized by comprising the following main components in percentage by weight: 30.3-92% of inorganic filler, 0.3-2% of a modifying agent and 8-69.7% of a resin matrix, wherein the sum of the contents of all the components is 100%; the inorganic filler comprises hollow microspheres, glass fiber, mica, superfine calcium carbonate, glass fiber/mica, glass fiber/superfine calcium carbonate, mica/superfine calcium carbonate or glass fiber/mica/superfine calcium carbonate, wherein the hollow microspheres are refined from coal ash, and particle size of the hollow microspheres is 3-10mu m; the modifying agent is titanate ester, aluminic acid ester, titanate ester/aluminic acid ester or a silane coupling agent; and the resin matrix is high-density polyethylene. The polyethylene pipe composite material has the advantages that loop stiffness can be improved and cost can be reduced; therefore, the polyethylene pipe composite material has a great prospect.

The invention relates to the technical field of preparation of a metal material, and particularly relates to a thoriated tungsten rhenium wire, which is especially suitable for winding a microwave oven magnetron, and a preparation method thereof. The thoriated tungsten rhenium wire is characterized by comprising the following components of 0.5-1.5% of thorium oxide, 0.3-0.5% of rhenium, 0.0020-0.0080% of potassium, and 97-98% of tungsten. Compared with the prior art, the thoriated tungsten rhenium wire has the following advantages that (1) according to the thoriated tungsten rhenium wire prepared by the method disclosed by the invention, thorium oxide particles are in fine and even distribution even if 0.0020-0.0080% of potassium is doped; and (2) the thoriated tungsten rhenium wire disclosed by the invention contains a microelement potassium in ingredient; a little of rhenium is added; the grain does not easily grow after the magnetron coil for the micro-wave oven wound by the thoriated tungsten rhenium wire is carbonized at a high temperature; stable tissue can be kept; and brittle failure caused by vibration in the transportation processes such as package, shipment and the like after production is finished can be ensured.

The invention discloses a preparation method of a high-toughness polylactic acid membrane, and belongs to the technical field of polylactic acid membrane preparation. The method includes the steps of modifying montmorillonite by cetyl trimethyl ammonium bromide to prepare organic modified montmorillonite for use, taking nano crystalline cellulose, paraformaldehyde and the like to be stirred and mixed and then centrifuged to obtain precipitates, washing and drying the precipitates, making the precipitates, the organic modified montmorillonite for use and the like mixed, extruded and granulated to prepare a material master batch, and conducting extrusion-blow molding to prepare the high-toughness polylactic acid membrane. The method has the advantages that the preparation steps are simple, the obtained polylactic acid membrane is high in crystallinity, and the polylactic acid membrane has good toughness and is free of brittle fractures after being used.

The invention discloses a low-temperature soluble aluminum alloy and application thereof, and the aluminum alloy comprises the following elements in percentage by weight: 1.5 wt% of Mg, 1wt% of Ga, 0.7 wt% of In, 1wt% of Sn, and the balance of Al and inevitable impurity elements. The tensile strength of the steel plate is 390-460 MPa, and the ductility of the steel plate is 12-20%. The soluble aluminum alloy is obtained by carrying out homogenization treatment, hot extrusion treatment, solution treatment and aging treatment on the components after smelting and ingot casting. The soluble aluminum alloy material can be used as a material of a fracturing tool for shale oil and gas exploitation. The prepared low-temperature soluble aluminum alloy has a low-temperature phase, can be used in a low-temperature environment, and is soluble at low temperature and controllable in solubility.

The invention discloses a polyurethane rigid foam plastic for covering austenitic stainless steel, which is prepared from component A and component B. Component A consists of 100 parts by weight of polyol, 3.0-5.5 parts of amine catalyst, physical hair 7-20 parts of foam agent, 1.5-2.5 parts of water, 2.0-3.5 parts of foam stabilizer and 0.05-1.10 parts of chloride ion scavenger; component B is polyphenyl polymethylene polyisocyanate; the polyurethane rigid The leached chloride ion content of foamed plastics is ≤45mg/kg. The preparation method is as follows: uniformly mix the materials in component A to obtain component A; stir and mix component A and component B uniformly to obtain a mixed material, and pour the mixed material into a mold to solidify and form it. The foamed plastic in this application can basically avoid corrosion of stainless steel due to the influence of chloride ions in the insulation material, and reduce the harm caused by the factors of chloride ions in the insulation material.