117results about How to "Improve machinability" patented technology

The invention provides a high-temperature-resistant carbon fiber reinforced phenolic resin composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out high-temperature oxidation treatment on carbon fibers; secondly, carrying out surface modification on the carbon fibers by using a chemical modifier; then mixing the modified carbon fiber, an antioxidant and a dispersing agent to prepare slurry; performing vacuum filtration on the prepared slurry, and drying to obtain a carbon fiber blank; preparing a phenolic resin infiltration solution, and impregnating the carbon fiber blank with the phenolic resin infiltration solution; and finally, carrying out mold pressing and curing to obtain the high-temperature-resistant carbon fiber reinforced phenolic resin composite The preparation method is simple in required equipment, convenient to operate, stable in process, high in production efficiency and suitable for large-scale industrial production. According to the high-temperature-resistant carbon fiber reinforced phenolic resin composite material prepared by the preparation method, the bonding property between the carbon fiber and the phenolic resin is improved, certain toughness and strength are provided, and meanwhile, the high-temperature-resistant carbon fiber reinforced phenolic resin composite material has the advantages of ablation resistance, good oxidation resistance in a high-temperature environment and the like.

The invention relates to a preparation method of a niobium rod with uniformly crushed crystal grains, which comprises the following steps: firstly, casting an alloy raw material to obtain a cast ingot, and preheating the cast ingot to obtain a first blank; then the first blank is subjected to multiple times of axial forging and first heat treatment, and a second blank is obtained; then carrying out surface treatment on the second blank to remove defects on the surface of the second blank, and carrying out radial forging on the second blank to obtain a third blank; then, the third blank is subjected to oxidation treatment so that an oxidation film can be generated on the surface of the third blank to protect the third blank, hole pattern rolling is conducted on the third blank with the oxidation film generated multiple times, and a first bar is obtained; secondly, the first bar is subjected to rotary swaging and polishing, and a second bar is obtained; and finally, the second bar is subjected to second heat treatment, and a finished bar is obtained. Through multiple times of axial forging, radial rotary forging and groove rolling rotary forging, the obtained finished bar is uniform and fine in grain structure, the grain size GS is 7-9 grade, the elongation is larger than or equal to 40%, and the hardness (HV / 2.9 N) is smaller than or equal to 60.

The invention relates to the technical field of lithium batteries, in particular to a composite binder aqueous solution, a silicon-based negative pole piece and a preparation method and application of the silicon-based negative pole piece. The preparation method of the composite binder aqueous solution comprises the following steps: dissolving a water-based polymer binder and a micromolecular physical crosslinking agent in water, adding pyrrole, stirring, adding an initiator, and mixing to obtain the composite binder aqueous solution. A small molecule physical cross-linking agent is introduced into the water-based polymer binder, and a large number of hydrogen bond binding sites are increased, so that the mechanical property of the binder is remarkably enhanced, and the machinability of the pole piece is further improved. Meanwhile, polypyrrole can be generated in the binder through in-situ polymerization, and the polypyrrole can be tightly coated on the surfaces of the silicon particles through strong interaction between the binder and the silicon particles to form a stable conductive network, so that the charge transfer capability of the electrode is remarkably improved. In addition, the composite binder is also beneficial to formation of a solid electrolyte layer rich in Li-N and participates in formation of a solid electrolyte interface layer, so that the lithium ion transmission capability of the composite binder is further improved.

The invention discloses a cutting device and a cutting method. The cutting device comprises a cutter, an energy supply assembly and a liquid guide assembly. The cutter is used for cutting a workpiece to be machined, and the cutter is made of a light-transmitting material. The energy supply assembly is configured to be capable of emitting laser, the laser penetrates through the tool and irradiates a machining part at the cutting position of the tool, the liquid guide assembly is suitable for providing reaction liquid for the machining part, and the reaction liquid is configured to be used for reacting with the machining part under irradiation of the laser so that materials of the machining part can be modified. And therefore, the difficulty in machining of the material at the machining part is improved, and the cutter can remove the material at the machining part of the to-be-machined workpiece conveniently. Under the dual effects of an energy field provided by the energy supply assembly and physical and chemical reactions of the reaction liquid, the material property of the processing part is rapidly and accurately changed, and on the premise of ensuring the processing quality, the controllability of material modification is realized, and the modification efficiency of the material is improved.

The invention provides a method for repairing and regenerating waste lithium iron phosphate, and belongs to the technical field of recycling of lithium ion battery materials. The preparation method of the regenerated lithium iron phosphate active material comprises the following steps: obtaining waste lithium iron phosphate powder from a positive plate of a waste lithium iron phosphate battery, mixing the waste lithium iron phosphate powder with a lithium source, a ferrous reducing agent and a carbon source according to a specific ratio, and carrying out two-stage calcination in an atmosphere containing a hydrogen-nitrogen mixed gas to obtain the regenerated lithium iron phosphate active material. The regenerated lithium iron phosphate active material can be directly obtained. The method has the characteristics of short process, simplicity in operation and easiness in industrial popularization, waste materials in the process are free of acid and alkali waste liquid, high-pollution gas and the like, and the method is environment-friendly; meanwhile, the regenerated lithium iron phosphate material is high in compaction density and good in machinability, and the electrochemical performance of the formed battery is still excellent.

The invention belongs to the technical field of optical fibers, and particularly discloses application of microcrystalline glass in an optical fiber ferrule and an optical fiber connector. The glass ceramic comprises the following components in percentage by weight: 50 to 80 percent of SiO2 (silicon dioxide), 5 to 40 percent of Al2O3 (aluminum oxide), 8 to 30 percent of Li2O (lithium oxide) and 0.1 to 3 percent of a strength additive, the strength additive is one or more of a rare earth metal compound, a transition metal compound, organic fibers, borate, phosphate, magnesium oxide or magnesium fluoride. According to the invention, the microcrystalline glass added with the strength additive is used as an insertion core material of the optical fiber connector, so that the optical fiber connector can show higher environmental stability and higher thermal shock resistance in an extremely high temperature environment, and performance fluctuation caused by high temperature thermal expansion and thermal cycle impact is reduced; and the method can be applied to high-temperature fields such as high-power laser and the like and fields with large environment temperature change.

This invention relates to the field of carbon fiber composite materials technology, and discloses a carbon fiber bundle composite filament coated with nanofiber yarn, comprising carbon fiber bundles and nanofiber yarn, wherein the nanofiber yarn coats the outer surface of the carbon fiber bundles; the carbon fiber bundles are high-modulus carbon fiber bundles, and the nanofiber yarn is prepared from polymer materials by conjugated electrospinning. This invention utilizes conjugated electrospinning technology to introduce a dense and uniformly distributed layer of nanofiber yarn onto the surface of high-modulus carbon fiber bundles, obtaining a carbon fiber bundle composite filament coated with nanofiber yarn. This composite filament exhibits good wear resistance and toughness, and its processability is significantly improved.

The invention discloses a novel metal test piece end face polishing and grinding device which comprises a test piece chuck, a pressing device, a straight driven piece, a plane cam, a movable sliding block assembly body, a linear guide rail structure and a movable frame. The test piece chuck comprises a dovetail matching block, a test piece chuck block, a pressing screw and a chuck fixing screw. The pressing device comprises a cover plate, a compression spring, a lifting block, a threaded pin and a rolling bearing; the straight follower comprises a lifting block, an indexing block and a limiting screw. By means of the novel metal polishing and grinding device, the problem that after traditional manual polishing and grinding equipment conducts polishing and grinding, cambered surfaces and fillets appear on the polishing and grinding end face is solved, the yield of metallographic samples and the utilization rate of consumable items such as abrasive paper are increased, a linear one-way polishing and grinding mode is researched, developed and provided, and a novel semi-automatic mechanical polishing and grinding device is designed.

A high-strength hot-rolled steel sheet according to the present invention has a specific chemical composition and a steel microstructure including, as main phases, 80% to 100% of martensite and bainite in terms of total area fraction. An entire area fraction of the martensite in the bainite is 2% to 20%. Among the martensite in the bainite, an area fraction of martensite each having an orientation difference of 15° or more between a crystal orientation of the martensite and a crystal orientation of at least one of bainite adjacent to the martensite is more than 50% relative to the whole martensite. When regions surrounded by boundaries between adjacent crystals having an orientation difference of 15° or more are defined as crystal grains, an average aspect ratio of the crystal grains present in a region extending from a surface of the steel sheet to a depth of 5 um is 2.0 or less.

The application provides an image-side telecentric F-Theta scanning lens and application thereof, and relates to the technical field of optical imaging. The image-side telecentric F-Theta scanning lens comprises a diaphragm, a first positive lens, a second negative lens, a third positive lens, a fourth negative lens and a fifth positive lens which are coaxially arranged in sequence along the light path propagation direction. The fourth negative lens and the fifth positive lens are glued to form a glued double lens, and share one glued surface. The diaphragm is located at the front of the lens, is spaced apart from the first lens by 36.71 mm, and serves as an aperture diaphragm of the system to limit the incident light beam. The image-side telecentric F-Theta scanning lens provided by the application not only has a simple structure, but also is applied to scenes such as hyperspectral microscopic imaging, multi-waveband fluorescent microscopic imaging and wide-waveband industrial detection, and can realize low-distortion, image-side telecentric high-quality scanning imaging in a wide spectral range, so as to meet the strict requirements of the microscopic imaging system on large-field uniform illumination and accurate geometric measurement.

There is provided a lead-free free-cutting beryllium copper alloy that is superior in machinability. The lead-free free-cutting beryllium copper alloy consists of from 1.80% to 2.10% by weight of Be, from 0.10% to 3.00% by weight of Si, from 0.20% to 0.40% by weight of Co, from 0% to 0.10% by weight of Fe, from 0% to 0.10% by weight of Ni, and the balance being Cu and inevitable impurities, wherein the beryllium copper alloy includes a matrix phase being an α phase, a Si-rich phase being a κ phase rich in Si, and Co-Be-Si intermetallic compound grains containing Co, Be, and Si, and optionally Fe and / or Ni.

The invention relates to the technical field of pharmaceutical preparations, in particular to a preparation process of crotamiton and an external preparation applied by the crotamiton. Comprising the following steps: step 1, slowly dropwise adding 2-butenoyl chloride into N-ethyl-o-toluidine, and controlling the reaction temperature at 10-30 DEG C; after the reaction is finished, heating to 45-55 DEG C, and reacting for 2-4 hours to obtain a product A; adding purified water for dilution, adding a demulsifier, and adding ethyl acetate for extraction to obtain an organic phase; 2, washing the organic phase with a hydrochloric acid solution and a sodium hydroxide solution in sequence, performing liquid separation, performing reduced pressure distillation, collecting fractions at the temperature of 152-155 DEG C and the pressure of-0.096 to-0.1 Mpa, performing refined filtration with a 0.2-0.24 [mu] m filter element in sequence, performing filling, performing capping, and performing packaging; and thus, the crotamiton is obtained. And preparing a medicine solution from crotamiton and other substances, and combining the medicine solution with the pre-gel solution to obtain the external preparation of crotamiton.

The invention discloses a nodular cast iron well lid and a production device and method thereof, and relates to the technical field of nodular cast iron well lids, the nodular cast iron well lid comprises a workbench, a fixed cylinder and a movable cylinder, and the fixed cylinder is located above the workbench; the movable cylinder is arranged in the fixed cylinder in a penetrating mode and is coaxially connected into the fixed cylinder in a sliding mode, a first stock bin and a second stock bin which are independent of each other are arranged at the positions, on the two sides of the movable cylinder, in the fixed cylinder respectively and used for containing lime or fine sand of different colors respectively, and the bottom end of the movable cylinder is connected with a detection ball in a rolling mode; a first discharging port and a second discharging port are formed in the bottoms of the inner side walls of the first bin and the second bin respectively, the first discharging port is located below the second discharging port, a first communicating port and a second communicating port are formed in the two side walls of the movable cylinder respectively, and when the movable cylinder slides up and down, the first communicating port communicates with the first discharging port, and the second communicating port communicates with the second discharging port. Or the second communicating port is communicated with the second discharging port. The method has the effect of improving the production efficiency of the nodular cast iron well lid.

A method for preparing a multi-component polyimide resin includes the steps of first preparing polyimide acid (PAA) and then preparing the multi-component polyimide resin. The multi-component polyimide resin employs a unique molecular structure design, which endows the material with excellent heat resistance. It exhibits superior heat resistance, maintaining structural stability and performance unchanged at high temperatures, which is particularly important for temperature-sensitive fields such as aerospace and electronic packaging.

The invention discloses a nascent filament, a polyamide fiber and a preparation method and application of the nascent filament and the polyamide fiber. The nascent filament is prepared by the following steps: performing wet spinning on a spinning solution to form the nascent filament; wherein the viscosity of the spinning solution is not lower than 1Pa. S; wherein the spinning solution comprises polyamide and a solvent; the polyamide contains at least one diamine unit and at least one diacid unit, the diacid unit contains at least one aliphatic diacid unit and at least one aromatic diacid unit, and the diamine unit at least contains a pentamethylene diamine unit. The wet spinning technology can be suitable for high-melting-point polyamide resin and is beneficial to industrial large-scale production, the prepared nascent filaments are good in processability, and the polyamide fibers prepared from the nascent filaments have excellent heat resistance, high strength and low shrinkage performance and can adapt to various application scenes.

The application provides a composite metal sodium negative electrode material, a preparation method thereof and a sodium metal battery. The composite metal sodium negative electrode material comprises a porous organic film skeleton, an alloy type conductive sodium-philic layer and sodium metal filled in the pores inside the porous organic film skeleton. The application takes the porous organic film skeleton as a base material, constructs a three-dimensional flexible skeleton, and deposits the alloy type conductive sodium-philic layer on the porous organic film skeleton, so that the active sites for sodium ion deposition are increased and the rapid transmission of sodium ions is promoted.

This invention relates to a bag-film laminate comprising a base layer, a gas barrier layer, and a sealant layer sequentially laminated together, wherein the amount of lubricant present on the surface of the sealant layer is 5 mg / m³. 2 Up to 25 mg / m 2 The surface roughness (Ra) of the sealant layer is 0.1 μm to 0.5 μm. The amount of lubricant is obtained by cutting the bag-film assembly into 100 mm × 100 mm sections in the MD direction and TD direction, dropping 5 ml of chloroform onto the surface of the sealant layer of the bag-film assembly and letting it stand for 1 minute to prepare a lubricant extraction solution, and then using gas chromatography to measure the amount of lubricant contained in the lubricant extraction solution.

The application belongs to the technical field of lithium ion batteries, and particularly relates to a dry-process electrode preparation process for improving a PTFE fiberization network, which comprises the following steps: uniformly mixing an active material, a conductive agent and activated carbon through a mixer; adding a binder PTFE for secondary mixing; performing fiberization treatment on the above material; performing roller pressing on the fiberized powder to form a film, and compounding the film with a current collector to obtain a dry-process electrode. Through the preparation of the dry-process electrode, local stress concentration points can be formed in the mixing and fiberization processes, the shearing action on PTFE particles is improved, the PTFE particles are caused to deform and fiberize, the problem of low fiberization degree and poor mechanical performance in the process of preparing the dry-process electrode by the original fiber method is effectively improved, the ion resistance of the pole piece is lower, and the pole piece exhibits better electrochemical performance.

The present invention relates to a moisture-curable siloxane composition comprising an organohydroxy polysiloxane, an organopolysiloxane, an alkoxy group-containing silane compound, a curing catalyst, and a tackifier, in which the organohydroxy polysiloxane comprises an alkoxy group-containing repeating unit, the organopolysiloxane includes a first organopolysiloxane terminated with an alkoxy group at opposite ends and a second organopolysiloxane terminated with a silanol group at opposite ends, and the tackifier includes a cyclosiloxane-based compound, and a cured product prepared therefrom.

The present invention relates to a modified conjugated diene polymer having excellent rolling resistance and improved processability, a method for preparing the same, and a rubber composition comprising the same, and provides a modified conjugated diene polymer comprising a repeating unit derived from a conjugated diene monomer and a functional group derived from a modifier and satisfying conditions (i) to (vii), a method for preparing the same, and a rubber composition comprising the same.

The present application relates to the field of organic electrochromic materials, and particularly relates to a transparent conductive material, a preparation method and application. The transparent conductive material simultaneously introduces two independent carbonyl groups in a molecular main chain, and realizes accurate coordination of energy level, polarity and charge transport performance through differential regulation of oxygen or nitrogen atoms. The polymer can be used as an ion storage layer, an electrode modification layer or an active functional layer in an electrochromic device, can realize fast reversible optical modulation at a low voltage (±1.0 V), has a high optical contrast (ΔT 550 > 65%), a short response time (<2 s) and excellent cycle stability (more than 3×10 4 times of cycles, a retention rate >95%), and has a wide application prospect in the fields of intelligent display, energy-saving buildings and flexible electronics.

The invention discloses an air-conditioning outlet with an air-inlet guiding function, wherein an air guide plate is rotatably installed on the air-inlet side of an inner frame, so that the wind discharged from the air outlet of an air-conditioning main unit is guided as much as possible into the frame of the air-conditioning outlet, the hardness of the air guide plate is greater than that of a traditional fire-resistant cloth connecting tube, and the air guide plate significantly improves the air-guiding efficiency for the air-conditioning main unit compared with the traditional fire-resistant cloth connecting tube; the air guide plate is rotatably installed on the air-inlet side of the inner frame, and the opening angle of the air guide plate can be flexibly adjusted according to the distance between the air outlet of the air-conditioning main unit and the air-conditioning outlet, so as to ensure that the air guide plate has the best air-guiding efficiency and use flexibility for the air outlet of the air-conditioning main unit; at the same time, the air volume of the wind discharged from the air outlet of the air-conditioning main unit blown onto the outer frame is reduced, especially in summer, the condensation phenomenon on the outer frame of the air-conditioning outlet is significantly reduced; the air-conditioning outlet has a simple and reasonable structural design, high feasibility of preparation and implementation, and strong practicality.

Provided is an electronic device that achieves both stability of electrical contact between terminals and sealing performance. A power supply unit 101 includes a power supply adjustment board 10 and a holder 100 that holds the power supply adjustment board 10, an accommodation member 20 that accommodates the power supply unit 101 inserted from an opening 20a, and a cap member 23 that closes the opening 20a, wherein a positive electrode terminal 42 and a negative electrode terminal 43 are arranged side by side in the accommodation member 20, a positive electrode terminal 14 and a negative electrode terminal 15 are arranged side by side on one end side in the power supply unit 101, a locking mechanism P that locks the power supply unit 101 is provided in the accommodation member 20 such that the positive electrode terminal 14 and the negative electrode terminal 15 of the power supply unit 101 are brought into electrical contact with the positive electrode terminal 42 and the negative electrode terminal 43 of the accommodation member 20, and power supply lines 27 and 29 are disposed to penetrate the cap member in a sealed state and configured for connecting an external power supply to the power supply adjustment board 10.

The invention discloses a method for preparing polyethylene by using hexene as a comonomer through a slurry method and high-molecular-weight polyethylene. Monomer ethylene and comonomer 1-hexene are used as raw materials; uniformly mixing a catalyst and supercritical ethane fluid to prepare a catalyst solvent; raw materials, a catalyst solvent, hydrogen and supercritical ethane fluid are continuously added into a first stirring reaction kettle for a prepolymerization reaction, slurry discharged from the first stirring reaction kettle enters a second stirring reaction kettle for a polymerization reaction, and after polymerization is completed, the slurry is subjected to post-treatment to obtain a finished product. According to the method for preparing the polyethylene by the slurry method by taking the hexene as the comonomer, the melt index, the density and the molecular weight of the product can be improved by the supercritical ethane, and the impact resistance of the material is enhanced.

This hot-rolled steel sheet has a predetermined chemical composition, in which, when a region of 1 / 8 to 3 / 8 of a sheet thickness in a sheet thickness direction from a surface is defined as a 1 / 4 depth position, a microstructure at the 1 / 4 depth position includes, by area fraction, retained austenite: less than 3.0%, ferrite: less than 30.0%, and pearlite: less than 5.0%, at the 1 / 4 depth position, an average number density of Ti-based carbides having a longest diameter of 15 nm or more is 1.0 × 104 / mm2 or more, and an average grain size dq is 15.0 µm or less, and a tensile strength is 980 MPa or more.

The invention discloses a wood carbon aerogel electromagnetic shielding material loaded with magnetic iron-cobalt nanoparticles and a preparation method of the wood carbon aerogel electromagnetic shielding material. The electromagnetic shielding material is of a multi-stage directional pore channel structure, and meanwhile, the magnetic iron-cobalt nanoparticles are uniformly distributed on the inner wall of a pore channel; the surface of the electromagnetic shielding material is rough, more heterogeneous interfaces can be generated, and dielectric loss of electromagnetic waves is facilitated. The multi-stage directional pore channel structure has excellent conductivity, dielectric property and magnetic property, so that the composite material can optimize the propagation path of electromagnetic waves and shows various electromagnetic wave loss mechanisms. The invention aims to realize uniform dispersion and loading of the magnetic metal nanoparticles in the oriented porous wood carbon-based material, so that the problems of complex interface regulation, insufficient pores, high manufacturing cost and the like of the traditional carbon-based magnetic composite material are solved.

This invention relates to a PCB back-drill cover plate and its preparation method. The preparation method includes: (1) impregnating resin onto a backing paper A and baking it to obtain a resin semi-cured sheet; placing aluminum foil on a backing paper B and laminating it to obtain an aluminum foil backing paper; (2) stacking one side of the backing paper B with the resin semi-cured sheet and then hot-pressing it to obtain the PCB back-drill cover plate. This invention uses aluminum foil backing paper to replace traditional pure aluminum foil, which can reduce the thickness of the aluminum foil and enhance the processability by relying on the backing paper, solving the problems of easy wrinkling, stretching, and breakage in aluminum foil processing; at the same time, the preferred use of ultra-thin aluminum foil can also improve the back-drilling depth control accuracy, residual pile consistency, and hole concentricity, reduce the risk of overcutting and simplify the drilling process. By pre-laminating the aluminum foil backing paper and optimizing the paper weight and glue application amount, the support of the cover plate and the flatness of the board surface can be improved, and the separate glue application step on site can be eliminated, making the process simpler and the performance more stable.

The application provides a 800MPa-grade torsion beam steel and a preparation method, and belongs to the field of steel preparation.The chemical components of the torsion beam steel include:C:0.06%-0.09%, Si>0 and ≤0.6%, Mn:1.5%-2.1%, P≤0.015%, S≤0.003%, Nb:0.01%-0.05%, Ti:0.03%-0.07%, Cr:0.3%-0.7%, Al:0.3%-0.7%, N>0 and ≤0.005%;the internal microstructure of the torsion beam steel includes:≥85% of bainite, 5%-10% of residual austenite, and the rest of ferrite or martensite.Through reasonable design of the chemical components of the steel, the bainite structure containing residual austenite is obtained, the high strength and high forming performance of the raw material are realized, and the high strength and excellent processability of the torsion beam steel are simultaneously considered.

Proposed is a dental bulk block for a CAD / CAM machining process, the dental bulk block being a glass-ceramic block having a crystalline phase embedded in an amorphous glass matrix. The crystalline phase includes lithium disilicate as a main crystalline phase, no sub-crystalline phase exists, and the crystalline phase has a mean grain size of 0.01 to 1.0 um and a crystallinity degree of 25 to 45%. The dental bulk block can improve machinability during cutting such as CAD / CAM machining in the state of a high-strength workpiece with high flexural strength, thereby reducing tool resistance and wear rate, increasing tool life span, and reducing edge chipping during machining. In addition, a dental restoration having translucency variations can be manufactured through a simple process of machining a block and altering post-heat treatment conditions, and thus can be realized with various shades. Therefore, it is possible to contribute to simplifying product management.

An oil ring wire 2 contains an alloy steel as a material. The alloy steel contains: 0.50 to 0.65% by mass C; 1.60 to 2.30% by mass Si; 0.60 to 1.10% by mass Mn; 0.75 to 1.15% by mass Cr; 0.18 to 0.45% by mass Ni; 0.05 to 0.15% by mass V; 0.15% by mass or less Cu; and inevitable impurities. In the oil ring wire 2, an area percentage of a carbide is more than 6.0% and 10.0% or less.