442results 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 discloses a die-casting process for a small cover plate of a motor end cover. The die-casting process comprises the following steps: step 1, raw material treatment; step 2, material melting operation; thirdly, die casting is conducted; 4, flushing a water gap; step 5, removing burrs; step 6, heat treatment before preparation; step 7, shape correction; 8, CNC machining is carried out; step 9, cleaning treatment; and step 10, packaging and warehousing. According to the invention, mechanical cleaning and acid pickling are carried out on the raw materials before melting operation is carried out on the cast aluminum, so that the purity of the raw materials is guaranteed, bubbles are prevented from being generated in the melting process, and the quality of the prepared product is improved; a modifier is added in the melting process to refine grains, so that the hardness and the corrosion resistance of the prepared product are improved; after die casting, pre-manufacturing heat treatment is carried out to optimize the machining performance of the plate, the process difficulty of CNC machining is reduced, meanwhile, the internal stress remaining in the plate is removed through the stress relief annealing process, and product deformation caused by the internal stress is prevented.

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 method for preparing low-viscosity vinyl fluorine-containing hyperbranched organic silicon resin, and belongs to the technical field of organic polymer materials. The low-viscosity vinyl fluorine-containing hyperbranched organic silicon resin is prepared by taking a vinyl-containing siloxane monomer, an alkyl-containing siloxane monomer and a fluorine-containing siloxane monomer as raw materials through hydrolysis nucleation, condensation growth, end capping and purification treatment. Wherein the content of vinyl is not lower than 3 wt%, the content of fluorine is not lower than 15 wt%, and the viscosity is not higher than 1000 mPa.s. The vinyl fluorine-containing hyperbranched organic silicon resin disclosed by the invention is used as a material with excellent characteristics of both vinyl organic silicon resin and a fluorine-containing polymer, the existence of vinyl can be suitable for various reaction conditions, the existence of a fluorine-containing group enables the vinyl fluorine-containing hyperbranched organic silicon resin to have excellent hydrophobic and oleophobic properties, and meanwhile, the fluorine-containing polymer material is relatively small in friction coefficient, so that the vinyl fluorine-containing hyperbranched organic silicon resin can be applied to various reaction conditions. The method has great application potential in the fields of oil-resistant sealing, anti-corrosion coatings, electronic materials, medical apparatuses and instruments and the like.

The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode active material, a preparation method, a lithium ion battery and electric equipment. The positive electrode active material comprises a modified lithium iron manganese phosphate composite material, the modified lithium iron manganese phosphate composite material comprises a main body material, the main body material comprises a lithium iron phosphate material and a lithium iron manganese phosphate material, and the volume average particle size of the lithium iron phosphate material is greater than that of the lithium iron manganese phosphate material; and the lithium manganese iron phosphate material and the lithium iron phosphate material are partially fused, so that the lithium manganese iron phosphate material grows on the surface of the lithium iron phosphate material in situ. Therefore, the lithium ion battery prepared from the modified lithium manganese iron phosphate composite material not only has better electrochemical performance, but also can reduce the difficulty of production and processing of the lithium ion battery.

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 cellulose-based polymeric dye and a preparation method thereof. The preparation method of the cellulose-based polymeric dye comprises the following steps: adding a cotton fabric into a mixed solvent containing an inorganic base, urea and water, stirring to obtain a cellulose solution, adding a reactive dye into the cellulose solution, and reacting; the cellulose and the dye are dissolved through a homogeneous system, so that the hydroxyl activity of the cellulose and the dispersity and adsorbability of the dye can be improved, high loading of a dye chromophore on a cellulose polymer skeleton is realized, and the problems of low dye utilization rate, easiness in dye hydrolysis, water consumption, salt consumption and the like in the dyeing process are solved; the method is of great significance to improvement of economic benefits and sustainable development of the printing and dyeing industry.

The invention discloses a method for manufacturing a circuit board of a thick copper slope circuit, which comprises the following steps of: attaching a first dry film layer on a thick copper layer, manufacturing a dry film pattern, retaining the dry film layer on the thick copper circuit, developing and removing the dry film layer on a thin copper circuit, developing the dry film layer on the slope circuit to form a matrix developing pattern, etching a slope circuit area to form a matrix etching pattern, and manufacturing the circuit board of the thick copper slope circuit. The method comprises the following steps of: grinding off a thick copper slope line, processing a line pattern, manufacturing a second dry film pattern, forming a surrounding pattern of all slope line areas, manufacturing a first solder mask layer in the surrounding pattern, manufacturing a second solder mask layer in other areas, and carrying out post-process processing to form a circuit board of the thick copper slope line; the processing precision and reliability of a slope circuit are improved through a mode of taking chemical processing of developing and etching as a main mode and taking polishing as an auxiliary mode, and a solder mask layer with the thickness reaching the standard and a complete covering effect is formed through manufacturing an encircling pattern and manufacturing a first solder mask layer and a second solder mask layer; the whole machining process effectively improves the machining precision and reliability.

The invention discloses a degradable polymer capable of resisting protein adsorption, a preparation method of the degradable polymer and application of the degradable polymer in preparation of a protein adsorption resisting material. The degradable polymer comprises the following raw materials: an initiator, a monomer and a double-bond terminated molecule. The degradable polymer is a block polymer terminated by a carbon-carbon double bond functional group, and the forming process of the degradable polymer comprises the following steps: carrying out polymerization reaction on a monomer under the action of an initiator or under the combined action of the initiator and a catalyst to obtain a first block polymer; and the first block polymer and the double-bond end-capping molecule are subjected to an end-capping reaction. The initiator comprises at least one of hydroxyl-terminated polyethylene glycol and n-arm polyethylene glycol, n is greater than or equal to 3, and the number-average molecular weights of the polyethylene glycol and the n-arm polyethylene glycol are respectively and independently 100-10000 g / mol. The mass ratio of the polyethylene glycol block in the degradable polymer is 5%-50%.

The invention provides a preparation method and application of a sulfide electrolyte and a composite solid electrolyte. The invention provides a liquid-phase synthetic sulfide electrolyte, and a composite solid electrolyte is prepared on the basis of the electrolyte, and has good chemical stability, interface conductivity and thermal stability during application; the conductive polymer material can form polymer fibers under the action of high-speed shearing force, so that the processability of the electrolyte can be effectively improved; after the film is formed, a fiber net structure can be formed, a polymerization state with a non-localized pi-electron conjugated system is generated, and the transmission rate of electrons and ions can be effectively improved; by introducing the conductive polymer material, the stability of the electrolyte membrane can be effectively improved, and good conductivity and material stability can still be kept at high temperature; surfactants are introduced to the two sides of the solid electrolyte membrane, the affinity to the positive electrode material and the affinity to the negative electrode material are improved through acting force, and then the conductivity and the surface resistance are improved.

The invention relates to the field of carbon-ceramic composite materials, in particular to a chopped carbon fiber reinforced carbon-ceramic composite material and a preparation method thereof.The chopped carbon fiber reinforced carbon-ceramic composite material is prepared from, by weight, 10-60 parts of chopped carbon fibers, 10-60 parts of silicon carbide powder, 10-60 parts of carbon powder, 10-60 parts of phenolic resin and 0.1-10 parts of graphene; the prepared carbon-ceramic composite material has good mechanical properties and excellent wear resistance, the densification process of the material is rapid and does not need to be repeatedly carried out, the time is saved, and the production efficiency is improved.

The invention provides benzocyclobutene-containing aromatic diamine and a preparation method thereof, and the preparation method comprises the following steps: dissolving 3-[1, 4-benzenediol]-bicyclo [4.2. 0]-octyl-1, 3, 5-triene and 4-nitrochlorobenzene in a first organic solvent, and reacting under an alkaline condition to obtain a benzocyclobutene-containing dinitro compound; and dissolving the benzocyclobutene-containing dinitro compound in a second organic solvent, and reducing in a hydrogen atmosphere to obtain the benzocyclobutene-containing aromatic diamine compound. The invention also provides a benzocyclobutene-containing aromatic polyamide polymer and a preparation method thereof. According to the linear aromatic polyamide and the cross-linked aromatic polyamide prepared by the invention, the content of benzocyclobutene in the structure can be adjusted according to a use scene, so that the mechanical strength, the thermal stability and the CTE are changed to adapt to different application requirements, and the linear aromatic polyamide is relatively good in solubility in an organic solvent, so that the linear aromatic polyamide is easy to process and relatively good in film-forming property.

The invention discloses a high-entropy alloy structured composite negative electrode material and a preparation method thereof and a lithium metal battery, and belongs to the technical field of lithium batteries, the high-entropy alloy structured composite negative electrode material comprises lithium, non-metallic elements and other metallic elements, the ratio of lithium atoms to total atoms in the composite negative electrode material is 40-80 at%, and the ratio of non-metallic elements to total atoms in the composite negative electrode material is 1-10 at%. The ratio of atoms corresponding to the non-metallic elements to the total atoms is 1-20 at%, the balance is other metallic elements, the atomic ratio of the other metallic elements is equal, the metal lithium and compounds or simple substances of the other metallic elements are smelted to obtain high-entropy alloy liquid, the high-entropy alloy liquid is subjected to heat preservation and poured into a mold, the high-entropy alloy sheet is obtained after cooling, and the composite negative electrode material contains various eutectic phases, the internal composition segregation is weakened, the organization structure is more uniform, the distortion degree and dislocation accumulation of the alloy in the deformation process are reduced, then the effect of improving the ductility is achieved, and the commercial application of the lithium alloy negative electrode is improved.

The invention provides a Kevlar nanofiber composite membrane and a preparation method thereof, and relates to the field of nanofiber composite membrane preparation. The method comprises the following steps: respectively preparing a Kevlar nanofiber dispersion liquid and PVA-co-PE nanofibers, diluting the Kevlar nanofiber dispersion liquid to obtain a Kevlar nanofiber hydrogel, mixing the Kevlar nanofiber hydrogel with the PVA-co-PE nanofibers, adding a mixed solution of water and isopropanol and a cross-linking agent, and carrying out stirring, cross-linking, suction filtration and hot pressing to obtain the Kevlar nanofiber composite membrane. The cross section of the composite film is of a compactly stacked layered embedded structure, so that the composite film has excellent mechanical strength and durability, can effectively resist external stress, and avoids mechanical damage. In addition, due to the layered structure, the composite film has good machinability, processing operations such as cutting, coating and stacking can be conveniently carried out in practical application, and various industrial and engineering application requirements can be met. The preparation method provided by the invention is simple and convenient to operate, economical and efficient, has high reproducibility and is easy to realize industrialization.

The invention provides a modified copolyester film as well as a preparation method and application thereof. The modified copolyester film is prepared from the following raw materials: binary acid, dihydric alcohol and a catalyst, the binary acid comprises 2, 5-furandicarboxylic acid and other binary acid; the dihydric alcohol comprises neopentyl glycol and other dihydric alcohol. 2, 5-furandicarboxylic acid is introduced into a modified copolyester molecular chain, so that the polarity and hydrophilicity of polyester are improved, the interfacial interaction force between the polyester surface and a copper foil is increased, and the adhesive force between the polyester surface and the copper foil is improved; neopentyl glycol is introduced into a modified copolyester molecular chain, so that the regularity of polyester is further destroyed, the crystallinity and the melting point of polyester are reduced, the film is easier to soften or partially melt when in contact with a copper foil, the contact area between the film and the copper foil is increased, mutual diffusion between the film and the copper foil is increased, and the bonding strength between the film and the copper foil is improved.

The invention discloses an absorbable tissue adhesion material, a preparation method thereof and an application of the absorbable tissue adhesion material in preparation of a body solid material, a coating material or an injectable liquid material. The preparation method comprises the following steps: heating lipoic acid monomer powder to carry out polymerization reaction, and carrying out ultraviolet polymerization on the obtained polymer in a solution in the presence or absence of polyphenol to obtain a lipoic acid polymer which can absorb the tissue adhesion material, the ultraviolet light intensity of the ultraviolet light polymerization is 20-100W / cm < 2 >, and the ultraviolet light wave band is 250-500nm. The absorbable tissue adhesion material disclosed by the invention is a degradable polymer material with excellent tissue adhesion and anti-inflammatory and anti-oxidation characteristics.

The invention discloses a polyion liquid-based solid electrolyte, a preparation method thereof and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The preparation method provided by the invention comprises the following steps: dispersing LLZTO nanoparticles into a polyacrylonitrile solution to obtain a spinning solution; performing electrostatic spinning on the spinning solution to obtain a composite fiber membrane; the preparation method comprises the following steps: mixing poly (diallyldimethylammonium) bis (fluorosulfonyl) imide, lithium bis (fluorosulfonyl) imide and 1-methyl-1-propyl pyrrolidinium bis (fluorosulfonyl) imide in a solvent to obtain a polyion liquid electrolyte solution; and immersing the composite fiber membrane into the polyion liquid electrolyte solution, taking out, standing and drying to obtain the composite fiber membrane. The solid electrolyte prepared by the invention has relatively high ionic conductivity and mechanical strength, and good flexibility and flame retardance, and a battery prepared from the solid electrolyte can circulate for more than 200 circles under high-rate current density.

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 utility model relates to an actuator, an active suspension and a vehicle, and the actuator comprises a driving module which comprises a stator, a rotor and a motor housing; the motion conversion assembly comprises a lead screw shaft and a nut; and the axial bearing is used for limiting the rotor in the axial direction, and the driving module is used for driving the nut to rotate so as to drive the lead screw shaft to drive the wheel to linearly move in the height direction. A rotor of the driving module drives a nut to rotate, the nut drives a lead screw shaft to drive a wheel to linearly move in the height direction, and then the height of the whole vehicle is adjusted. The structure is simple, the machinability is high, and disassembly and assembly are convenient; the transmission form of rotation and linear motion is more space-saving, and the control precision is higher; the axial bearing can play a role in limiting the rotor in the axial direction, so that the axial load borne by the rotor is resisted, the displacement of the rotor in the axial direction is avoided, the relative positions of the rotor and the stator in the axial direction are ensured, and the output efficiency of the motor is improved.

The invention discloses a preparation method of a regenerated colored polyester fiber, the regenerated colored polyester comprises regenerated polyester and pigment, the preparation method comprises the following steps: melting the regenerated colored polyester to obtain a regenerated colored polyester melt, the regenerated colored polyester fiber is prepared from the regenerated colored polyester melt through metering, spinneret plate extrusion, cooling, oiling, stretching, heat setting and winding, and an oil agent adopted in the oiling step at least comprises mineral oil and iso-tridecanol polyoxyethylene ether. According to the invention, the static friction coefficient mu s and the dynamic friction coefficient mu d are adjusted through the oil agent to obtain the cohesive force suitable for the fiber, so that the wear resistance of the fiber is improved, broken filaments generated by breakage of the fiber in the spinning process are reduced, and the machinability of the fiber is improved.

A high-precision quartz crystal vibrating beam accelerometer comprises a base, a meter core and a shell, a circuit board is packaged in the base, and the meter core is packaged on the base through the shell; the meter core comprises a mass pendulum, two resonant beams and two circular damping plates which are all made of quartz crystal materials; the mass pendulum comprises two semicircular bases, two semicircular pendulum tongues and a circular flexible layer, the two semicircular bases and the two semicircular pendulum tongues are symmetrically bonded to the two sides of the circular flexible layer respectively, and receding gaps are formed between the semicircular bases and the semicircular pendulum tongues; the resonant beam is radially arranged above a strip-shaped groove in the center of the outer end surface of the semicircular base, one end of the resonant beam is bonded with the semicircular base, and the other end of the resonant beam is bonded with the semicircular swing tongue and electrically connected with the circuit board; the two circular damping plates are connected to the two sides of the two semicircular bases in a semi-symmetrical bonding mode through the inner end faces, the resonance beams are located in strip-shaped holes of the circular damping plates, and the semicircular concave tables and the semicircular swing tongues are opposite to form vibration gaps.

The present invention discloses a pulse current assisted cutting system and a processing method, the system includes an electric pulse assisted processing device and a laser surface roughness online detection device; the electric pulse assisted processing device includes a high-frequency pulse generator and a fixture, the high-frequency pulse generator is connected to the fixture through a wiring cable, and the fixture is clamped on the fixture of a five-axis machining center; the laser surface roughness online detection device includes a laser roughness detection head, a holder and an oscilloscope, the holder is fixed on the tool magazine of the five-axis machining center, the laser roughness detection head is clamped on the top of the holder, the focus point points to the machined surface of the workpiece, and the laser roughness detection head is connected to the oscilloscope through a signal line. The present invention solves the problems of work hardening and severe tool wear faced by titanium alloys during processing, and can effectively ensure the stability of product quality and improve the production efficiency of titanium alloy components.

The invention discloses a high-temperature-resistant and erosion-resistant composite material for a plasma gasifier and a preparation method thereof, belongs to the technical field of high-temperature-resistant composite materials, and aims to solve the technical problem that the high-temperature-resistant and erosion-resistant performance of a ramming composite material for the plasma gasifier in the prior art needs to be further improved. The silicon nitride reinforced silicon carbide composite material comprises the following components in parts by weight: 50-70 parts of aggregate, 25-45 parts of powder and 5-8 parts of a binding agent, the component of the aggregate is a silicon binding material, and the aggregate is composed of coarse aggregate, medium aggregate and fine aggregate according to the weight ratio of (30-40): (40-50): (30-50). The particle size distribution of the aggregate and the composition of the powder and the binding agent are optimized, so that the high-temperature erosion resistance and the volume density of the composite material are effectively improved, and the heat-conducting property of the composite material is also reduced.

The invention relates to the technical field of flow battery diaphragms, and discloses a polyamide-like covalent organic framework diaphragm for a vanadium battery and a preparation method of the polyamide-like covalent organic framework diaphragm. Comprising the following steps: preparing a porous base membrane; preparing covalent organic framework nanosheet dispersion liquid by a solvothermal oxidation method; preparing a two-phase solution of interfacial polymerization; and preparing the polyamide-like covalent organic framework diaphragm. The processability of the covalent organic framework can be improved by a solvothermal oxidation method. The polyamide-like covalent organic framework diaphragm has high porosity, and pore channels are rich in sulfonic acid groups, so that the proton conductivity of the diaphragm can be improved. In addition, the polyamide-like covalent organic framework diaphragm has intrinsic pore channels of a covalent organic framework and polyamide pore channels, the effective pore diameter is reduced through a hierarchical pore effect generated by staggered arrangement of the intrinsic pore channels and the polyamide pore channels, and the ion selectivity of the diaphragm and the coulombic efficiency of the battery are improved.

The invention belongs to but not limited to the technical field of hydrogel, and particularly relates to a processing method of tough, transparent and adhesive supramolecular hydrogel, which comprises the following steps: step 1, preparing a supramolecular hydrogel precursor with a specific shape; step 2, dissolving the prepared precursor in water; step 3, freezing under a low-temperature condition; step 4, standing the frozen supramolecular hydrogel in air or dry inert gas; step 5, cutting and folding the obtained hydrogel, and processing the hydrogel into another shape; and 6, swelling the processed hydrogel in an acid-containing nutrient solution to obtain the final hydrogel. By adopting a supramolecular strategy and utilizing a high-density supramolecular network formed by tannic acid (TA) and polyvinyl alcohol (PVA), the mechanical property, transparency and adhesiveness of the hydrogel are remarkably improved.

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.

The invention provides a composite foil and tab transfer welding device which is characterized in that a wide tab belt and a narrow tab belt enter a thinning device through a guide roller, and the edges of the wide tab belt and the narrow tab belt are thinned by the thinning device; the composite foil tape, the thinned wide tab tape and the thinned narrow tab tape enter the roll welding device through a guide roller, and the roll welding device is used for welding the wide tab tape, the narrow tab tape and the composite foil tape; the winding mechanism is used for winding the welded wide tab strip, narrow tab strip and composite foil strip; according to the invention, the foil in the roll welding and printing area is thinned, so that the thickness of the welding and printing area is obviously reduced, thereby improving the machinability of the pole piece in the subsequent working section and reducing the machinability of bending and the like of the battery cell tab; and the thinned tab and the composite foil pole piece enter an ultrasonic roll welding device, and the three layers of foils are welded together, so that the electric connection of the double-sided foils is realized.

The invention provides a novel preparation method of a semiconductor composite substrate, relates to the technical field of semiconductor chips, and aims to solve the problem of relatively large material loss in a substrate preparation process. The preparation method of the novel semiconductor composite substrate comprises the following steps: providing a supporting layer and a donor layer, wherein the supporting layer comprises a D-level silicon carbide substrate; the donor layer comprises a first surface and a second surface which are oppositely arranged, and the supporting layer is bonded to the first surface of the donor layer; performing laser irradiation on one side, far away from the donor layer, of the supporting layer, forming a modified layer at a position, having a first preset thickness from the first surface, in the donor layer, forming a first sub-layer on a part, from the modified layer to the first surface, of the donor layer, and forming a second sub-layer on a part, from the modified layer to the second surface, of the donor layer; stripping the second sub-layer and the first sub-layer from the modified layer; and polishing the surface, away from the supporting layer, of the first sub-layer to obtain the semiconductor composite substrate. The semiconductor composite substrate is used for preparing electronic equipment.

The utility model discloses a protection structure of an umbrella nest, including lower umbrella nest and elastic protective sleeve, the lower umbrella nest includes nest body and extension section, the extension section is equipped with the fixed structure that prevents the elastic protective sleeve from sliding down, the fixed structure is annular necking groove or neck expansion structure, the elastic protective sleeve is sleeved outside the nest body, and the elastic protective sleeve is sleeved outside the nest body. The lower end of the elastic protective sleeve is provided with a necking section matched with the fixing structure, and the necking section is formed by the elastic protective sleeve extending inwards or downwards corresponding to the fixing structure. According to the utility model, the elastic protective sleeve is sleeved outside the lower umbrella nest, and the lower end of the protective sleeve and the extension section of the lower umbrella nest are provided with the anti-sliding fixing structures in a matched manner, so that the umbrella ribs are not interfered to be unfolded outwards and the protective sleeve does not slide downwards when the umbrella is unfolded, and the joint parts of the umbrella ribs and the nest body are completely wrapped in the protective sleeve when the umbrella is folded; the umbrella rib is separated from umbrella cloth and other umbrella ribs, the protection effect is obvious, and the umbrella rib is particularly suitable for multi-folding and miniaturized umbrellas.