19results about How to "Fully melted" patented technology

This invention relates to a method for controlling the surface accuracy of elliptical thin-walled compartments in additive manufacturing, belonging to the field of additive manufacturing technology. Addressing the challenges of surface control in additive manufacturing and post-processing of elliptical thin-walled compartments, this invention proposes a surface accuracy control method based on an internally supported dimensional structure. This method includes steps such as additive manufacturing model design of the elliptical compartment and its internally supported dimensional structure, integrated additive design, thermal processing, machining, and removal of the internally supported dimensional structure. The method applies the control of the internally supported dimensional structure extension used in additive manufacturing to the post-processing stage, achieving full-process surface control from additive manufacturing to post-processing, saving product manufacturing time and improving the overall efficiency of additive manufacturing.

The utility model provides a waste calcium carbide remelting and upgrading conveying device, which belongs to the technical field of conveying devices, and comprises a crushing chamber, a rotator arranged in the crushing chamber, two first rotating shafts rotationally connected in the rotator, two crushers fixedly connected to the lower ends of the two first rotating shafts, and two second rotating shafts rotationally connected in the two crushers. The two first gears are fixedly connected to the circumferential surfaces of the two first rotating shafts, the gear ring is fixedly connected to the interior of the crushing chamber, and the first gears are meshed with the gear ring. Meanwhile, powder calcium carbide directly reaches the furnace bottom through the inside of the electrode and does not make contact with a furnace charge layer, current shunting is eradicated, waste products are directly added to the furnace bottom after being powdered and can be rapidly reacted and fused with semi-finished product calcium carbide, and electric energy consumption is greatly reduced.

The invention relates to the field of high-temperature protective ceramic coatings for aero-engines, and particularly discloses an environmental barrier coating with a gradient structure and a long service life and a suspension plasma spraying preparation method thereof. The specific method comprises the following steps: by taking silicon powder as a raw material, preparing a bonding layer on a silicon carbide ceramic or SiCf / SiC ceramic-based composite material by utilizing an axial powder feeding three-electrode atmosphere plasma spraying system, preparing suspension liquid by taking rare earth silicate RE2Si2O7 and the like as raw materials, and respectively spraying a compact structure RE2Si2O7 middle layer and a columnar crystal-like structure RE2Si2O7 surface layer; and the prepared state coating is placed in Ar atmosphere and subjected to high-temperature annealing treatment, and the environment barrier coating with the high crystallinity and the gradient structure is obtained. The coating prepared by the invention has gradient transition structural characteristics, has excellent thermal shock resistance in actual tests, and has important application significance in prolonging the service life of silicon carbide ceramic or SiCf / SiC ceramic-based composite materials.

This invention discloses a method for preparing high-entropy ceramic matrix composites using a reactive infiltration process, belonging to the technical field of ceramic matrix composites. The steps are as follows: at least four single-component carbides are ball-milled and mixed with a carbon source, then dispersed in a dispersion liquid to obtain a slurry; continuous fibers are woven into a preform, and an interface layer and a matrix layer are deposited to obtain a semi-dense composite material; the slurry is introduced through vacuum or pressure impregnation; and a high-entropy carbide matrix is ​​generated in situ and densified by reactive infiltration after embedding with a transition metal and its alloy. This invention solves the problems of long process cycles, high porosity, high cost, and insufficient introduction of high-entropy ceramics in existing processes, achieving rapid densification and improving the material's high-temperature stability, oxidation resistance, and ablation resistance. It is suitable for the large-scale production of thermal protection materials for hypersonic vehicles.

The invention discloses an aluminum alloy surface anti-corrosion composition and a preparation method and application thereof.In the surface anti-corrosion composition, a WC hard phase provides the framework hardness of a coating, a Co-Cr metal phase endows the coating with good toughness, and the WC hard phase and the Co-Cr metal phase act synergistically, so that the obtained coating has excellent hardness, wear resistance and corrosion resistance; according to the surface anti-corrosion composition, rare earth powder is introduced to serve as an auxiliary, grains can be refined, grain boundaries can be purified in the coating, formation of a denser coating is promoted, an optimized Co-Cr metal phase is combined, and the corrosion resistance of the surface anti-corrosion composition is greatly improved. The long-acting corrosion resistance of the coating in severe environments such as salt mist and damp and hot environments is remarkably improved through synergism, bubbling and stripping of the coating and corrosion of a base body are effectively inhibited, and the remarkable corrosion resistance effect is achieved on the whole.

This invention provides a surface mount reflow soldering method and apparatus. The method includes: pre-treating the solder paste state and performing reference positioning correction on the PCB pads to align the PCB pads with the target pad area; using an electroformed stencil with inverted conical openings and a surface nano-coating, printing the pre-treated solder paste onto the PCB pads under closed-loop monitoring; placing the printed PCB in a reflow soldering chamber, and strictly controlling the residual oxygen content in the chamber below a preset critical value through a closed-loop oxygen concentration control system; and performing thermal history control of the reflow soldering peak temperature, holding time, and cooling temperature based on the melting point characteristics of the solder paste to complete the soldering process. This improves printing transfer efficiency, reduces soldering oxidation problems, and ensures sufficient melting and wetting of the solder.

This invention discloses a method for refining primary silicon in Al-Si alloys through synergistic modification with nano-ceramics based on laser additive manufacturing. The method involves uniformly mixing Al-Si alloy powder with TiB2 and Al2O3 nano-ceramics using a ball mill under inert gas protection to obtain a ceramic-reinforced nano-Al-Si alloy composite powder. This nano-ceramic-modified Al-Si alloy powder is then melted and solidified layer by layer using a laser powder bed melting and forming equipment to create the desired target part. In this method, during the solidification of the nano-ceramic-reinforced Al-Si alloy melt, Al2O3 nanoparticles, due to their similarity to the Si crystal structure and the existence of a good interfacial coherence relationship, act as heterogeneous nucleation sites for primary silicon, increasing the nucleation rate and refining the size of primary silicon. TiB2 nanoparticles, distributed at the solid-liquid interface, can to a certain extent prevent the diffusion and aggregation of Si atoms into Si-Si atom clusters, thereby inhibiting the growth of the primary silicon phase, promoting the regularization of the primary silicon morphology and refining its size, and effectively reducing matrix grain size, significantly improving the mechanical properties of the Al-Si alloy.

An extrusion screw and a manufacturing method thereof, the extrusion screw comprises a screw body and screw flights, the screw flights comprise a feeding section, a melting section, a transition section and a discharging section, the melting section is a double screw flight, the melting section comprises a melting first section, a melting second section and a melting third section, the pitch of the main screw flight of the melting first section is smaller than the pitch of the auxiliary screw flight of the melting first section, the pitch of the main screw flight of the melting second section is equal to the pitch of the auxiliary screw flight of the melting second section, the pitch of the main screw flight of the melting third section is smaller than the pitch of the auxiliary screw flight of the melting third section, wherein the pitch of the main screw flight of the melting section remains unchanged, the pitch of the auxiliary screw flight of the melting third section is greater than the pitch of the auxiliary screw flight of the melting first section, and the pitch of the auxiliary screw flight of the melting first section is greater than the pitch of the auxiliary screw flight of the melting second section, the manufacturing method comprises manufacturing a rod-shaped structure, manufacturing the transition section, manufacturing the screw flights of the feeding section, the main screw flight and the auxiliary screw flight, and manufacturing the screw flights of the discharging section, and the advantages of the present application are that the material is sufficiently melted and mixed, and the extruded material is dense and smooth.

The invention relates to the technical field of new materials, in particular to biodegradable filter cloth and a preparation method thereof.The biodegradable filter cloth is prepared from, by weight, polybutylene terephthalate, modified starch, polybutylene adipate, bamboo fibers, maleic anhydride grafted polyolefin elastomer and a lubricant; through the synergistic effect of all the components and the preparation process, the performance of the filter cloth can be optimized, the component compatibility problem is solved through cooperation of the modified starch and the compatilizer, the uniformity and compactness of the material structure are guaranteed through the bamboo fiber pretreatment and gradient melting process, the pore characteristics of the filter cloth are optimized through the segmented spinning and weaving process, and the filter cloth has the advantages of being high in practicability and high in practicability. Finally, the filter cloth simultaneously has excellent mechanical properties, efficient filtering performance and good biodegradability, is suitable for industrial production, and has wide application prospects in the fields of industrial filtration, environment-friendly treatment and the like.

The application provides a solid glue coating, a preparation method and application thereof, and a preparation method of a surface-coated composite material, and belongs to the technical field of functional materials.The solid glue coating provided by the application comprises the following preparation raw materials in mass fractions: 50-95 parts of base resin powder, 1-20 parts of graphene oxide-nano titanium dioxide composite material, 1-20 parts of barium sulfate, 0.1-10 parts of a curing agent, 0.01-5 parts of a defoaming agent, and 0.01-5 parts of a wetting and leveling agent.The solid glue coating provided by the application is a high-thermal-conductivity and high-fluidity composite resin powder, can be coated on the inner surface of a mold in the forming stage of a composite material product, and is heated and solidified together with a composite material matrix, wherein the solid glue coating forms a uniform, smooth and dense coating on the surface of the composite material matrix, is perfectly fused with the composite material matrix, and thus an integrally-formed surface-coated composite material is obtained, and the operation is simple and environment-friendly.

The application relates to the technical field of batteries, and discloses a battery cell, a battery pack and a manufacturing method of the battery cell, wherein the battery cell mainly comprises a shell, a pole group and a protection sheet; one end of the shell is provided with a pole; the pole group is installed in the shell, and one end of the pole group close to the pole is gathered to form a pole tab; the protection sheet is attached to the side surface of the pole tab away from the pole; the protection sheet has opposite first and second surfaces; the first surface faces the pole tab and is provided with a plurality of protrusions; the protrusions are partially embedded in the pole tab; the second surface is subjected to laser action to make the plurality of protrusions and the pole tab be welded and fixed; the pole tab and the pole are welded and fixed; and the pole tab is clamped between the protection sheet and the pole. The battery cell of the application sets the protection sheet on the side surface of the pole tab away from the pole, welds and fixes the protection sheet and the pole tab, welds and fixes the pole tab and the pole, and clamps the pole tab between the protection sheet and the pole, so that the risk of tearing of the pole tab is reduced, and the connection stability is improved.

This invention provides a method for preparing a quartz crucible with low bubble expansion rate, belonging to the field of quartz crucible production technology. The method includes: S1, pouring quartz sand into a mold and using centrifugal molding to form a crucible bubble layer and a transparent layer, wherein the crucible bubble layer uses coarse-grained quartz sand, and the crucible transparent layer uses fine-grained quartz sand; S2, inserting the formed quartz sand along with the mold into a melting chamber and starting a vacuum pump to evacuate to a predetermined pressure; S3, igniting an arc in the mold, and during the formation of the crucible transparent layer, performing a first stage of high-temperature melting on the quartz sand using a first preset power; S4, in the later stage of melting, performing a second stage of high-temperature melting on the quartz sand using a second preset power, and after the second stage of high-temperature melting, removing the mold to obtain a quartz crucible with low bubble expansion rate. This invention, through the combination of quartz sand particle size matching and melting power adjustment, ultimately prepares a quartz crucible with low bubbles and low bubble expansion rate.

The application discloses a solid waste recycling and forming mechanism for composite plastic, relates to the related technical field of plastic waste recycling and utilization, and comprises a screening seat, a sieve plate is internally installed in the screening seat, an electrostatic adsorption plate is connected to the sieve plate through a moving assembly, a conveying frame is installed at the side bottom end of the screening seat, a conveyor belt structure is arranged at the side end of the screening seat, one end of the conveyor belt structure is located at the bottom of the conveying frame, and a forming assembly is arranged at the side end of the conveyor belt structure. The solid waste recycling and forming mechanism for composite plastic processes waste material through the sieve plate and the electrostatic adsorption plate, reduces the problem that impurities in the waste material affect subsequent equipment, conveys plastic particles to the upper end of a conveying hopper through the conveyor belt structure, and the plastic particles enter a crushing box through the conveying hopper. The automatic conveying mode replaces manual carrying, greatly improves the material transfer efficiency, the conveying path is stable, waste caused by material scattering can be avoided, and the cost of raw materials is reduced.

The invention discloses a preparation method of a light-weight low-tensile high-modulus polyester industrial yarn, which comprises the following steps of: tackifying a high-viscosity polyester chip by a solid-phase tackifying device, melting and extruding by a screw extruder, entering a spinning manifold, distributing the melt in the spinning manifold by a spinning component, and pressing into a porous spinneret plate to form a tow, sequentially cooling, oiling, drafting, heat setting and winding to obtain the low-stretch high-modulus polyester industrial yarn. The intrinsic viscosity of the high-viscosity polyester chip is 1.10-1.16 dL / g, the melting point is 257-265 DEG C, the specification of the chip is 2.35 + / -0.50 g / 100, the number of holes of a spinneret plate is 280f, the hole pitch of the spinneret plate is 0.96 cm, and the hole diameter is 0.8-0.99 mm. The industrial yarn produced by the method shows excellent characteristics of light weight, low stretching and high modulus, and completely meets the requirements of high-end rubber framework materials such as radial tires and the like on high-performance fibers.

The present application relates to a kind of vanadium-aluminum alloy and its preparation method.The method comprises: after drying, vanadium oxide, slagging agent and aluminum-calcium alloy particles are mixed uniformly, the vanadium oxide is the mixture of vanadium pentoxide and di vanadium trioxide;Preheating;Take 10wt%-20wt% of mixed material to initiate in-situ composite thermal reduction reaction, form 1600℃-1950℃ high-temperature molten pool;The remaining material is pressed into the material ball with a diameter of 1.0-3.0 cm under 5-20 MPa pressure, and the obtained material ball is continuously added to the molten pool to maintain the temperature for reaction, while the reduction slag and alloy melt are separated;Cooling and deslagging to obtain vanadium-aluminum alloy ingot.The present application uses aluminum-calcium alloy particles as reducing agent, and utilizes its in-situ slagging function, combined with different valence vanadium oxide to control reaction heat, and continuous feeding process, realizes accurate control of composition, significant reduction of inclusions, efficient slag-gold separation, and the prepared vanadium-aluminum alloy has very low oxygen and nitrogen impurities, and the process flow is short, the cost is low, and it is suitable for aerospace-grade titanium alloy production.

The application relates to a high-boron austenitic stainless steel powder for laser additive manufacturing and a preparation method, wherein the high-boron austenitic stainless steel powder for laser additive manufacturing is composed of the following components in percentage by mass: C: <=0.04%, Si: 0.3-1.0%, Cr: 19-22%, Ni: 11-15%, Mn: 1.2-3.0%, B: 0.8-1.6%, N<=0.01%, O<=0.04%, S<=0.02%, P<=0.02%, and Fe is the balance. The high-boron austenitic stainless steel powder has good loose bulk density, tap density and fluidity, the tensile strength of the obtained high-boron austenitic stainless steel powder in a laser additive manufacturing accumulated state can reach more than 950 MPa, the elongation after fracture is more than 14%, meanwhile, the high-boron austenitic stainless steel powder has good local pitting corrosion resistance, and is suitable for complex components and integral forming in the fields of spent fuel treatment and transportation container manufacturing.

This invention relates to the field of welding technology and discloses a laser-arc hybrid welding device for building electrical construction, comprising a robotic arm, a wire feed tube, a guide cylinder, and at least two oscillating plates. Multiple oscillating plates are driven to oscillate synchronously via a lifting ring, enabling real-time and precise changes in the tilt angle of each laser emitter. This design allows the same device to achieve two key process modes: Mode 1, when high-efficiency welding is required, the laser beam can be precisely focused on the end of the welding wire to achieve high-energy-density hybrid welding; Mode 2, when pre-treatment or post-treatment of the weld is required, the laser beam can be spread out to irradiate both sides of the weld, preheating or slowly cooling the base material, effectively reducing welding stress and improving the fluidity of the molten pool.

The utility model relates to a kind of air source heat pump systems of small temperature difference defrosting exempt from shutdown.The system is additionally provided with first bypass branch and second bypass branch on refrigerant main circulation loop.System keeps running when defrosting, adjusts first bypass branch, distributes the refrigerant exhaust proportion of direct flow to evaporator and continues heat release in condenser, and mixed refrigerant medium-temperature superheated gas is obtained, enters evaporator and carries out small temperature difference defrosting;Second bypass branch is adjusted simultaneously, and compressor back gas is controlled, to ensure stable operation.Compared with prior art, the utility model realizes defrosting without shutdown by double bypass collaborative control;Without reversing four-way valve, system switches smoothly between heating and defrosting mode, reduces pressure fluctuation;System charging amount distribution changes little, and heating capacity can be quickly restored after defrosting;The defrosting heat source used is medium-low temperature refrigerant, reduces heat loss to environment, and defrosting efficiency is higher.

The application belongs to the technical field of surface modification, and particularly relates to a ceramic-based metal wear-resistant coating and a preparation method thereof. The coating is prepared from a ceramic-based metal mixed powder, and the ceramic-based metal mixed powder comprises 70-85% of ceramic powder, 7-15% of pure metal powder I, and 7-15% of pure metal powder II by mass fraction. The method comprises the following steps: step one, preparing a ceramic-based metal spraying powder; step two, performing sand blasting treatment on the surface of a part to be sprayed, and cleaning the part to be sprayed with compressed air after the sand blasting; step three, fixing the part to be sprayed on a workbench, adjusting the positional relationship between a plasma spraying gun and a laser gun head and the surface of the part, setting parameters, and spraying the surface of the part until the spraying thickness meets the requirement.