10results about How to "Increase nucleation point" patented technology

The invention discloses an efficient difunctional alkaline electrolysis water electrode which comprises a nickel net, an N deposition layer is deposited on the surface of the nickel net, and a NiFeW alloy layer is deposited on the surface of the N deposition layer. The invention further discloses a preparation method of the electrolyzed water electrode. The preparation method comprises the following steps: pre-treating the nickel net substrate; dissolving a nickel salt, a conductive salt and an additive in water to obtain a nickel electrodeposition solution; dissolving a nickel salt, an iron salt, a tungsten salt and an additive in water to obtain a nickel-iron-tungsten electro-deposition solution; and then the nickel net substrate is placed in a nickel electrodeposition solution to be subjected to constant-current deposition, a first electrode of an N deposition layer loaded on the nickel net substrate is obtained, the first electrode is placed in a nickel-iron-tungsten electrodeposition solution to be subjected to constant-current deposition, an N < iFeW > alloy layer loaded on the N deposition layer is obtained, and a finished electrode is obtained. The method has the advantages of low hydrogen evolution overpotential, low oxygen evolution overpotential, good stability, short-time deposition at room temperature, simplicity, easiness in control and low cost, and can be expanded to actual industrial application.

The invention provides a high-transparency and low-haze polyethylene composite material as well as a preparation method and application thereof. The high-transparency and low-haze polyethylene composite material comprises linear low-density polyethylene (LLDPE), a composite nucleating agent microemulsion, an antioxidant and a lubricant. The composite nucleating agent micro-emulsion is prepared from sodium benzoate and lithium bis (fluorosulfonyl) imide under the action of a fluorinated polyester nonionic surfactant, all the components of the composite nucleating agent micro-emulsion are matched, the preparation technology of the composite nucleating agent micro-emulsion is adjusted, all the components and the technology are in synergistic interaction, and the composite nucleating agent micro-emulsion is prepared. The finally obtained polyethylene film has excellent transparency and haze and good appearance, and the application of the polyethylene film in different fields at present is met.

The present invention relates to the field of laser processing technology, and in particular to an electromagnetic-assisted underwater laser additive device and method, the device comprising a laser additive component, an underwater dry zone component, a rotating electric field component, a rotating magnetic field component and an induction heating coil. The present invention arranges a rotating electric field and a rotating magnetic field inside and outside the underwater dry zone component respectively, and the electromagnetic field action area can change with the processing position. During the underwater additive manufacturing process, the molten pool is always at the center of the electromagnetic field action, and can stably apply electromagnetic stirring to the molten pool to improve / accelerate the flow of the molten pool. On the one hand, the flow improvement can facilitate the escape of bubbles and improve the density of the component. On the other hand, accelerating the flow of the molten pool can break up coarse dendrites, increase the nucleation points in the molten pool, and achieve the purpose of grain refinement. In this process, the element distribution between the dendrites will be more uniform. It has a good effect on the uniformity of the structure and defect control of the molded parts.

The application belongs to the technical field of continuous casting and particularly relates to a high-nitrogen Fe-Ni-based alloy protective slag. According to mass percentage, the high-nitrogen Fe-Ni-based alloy protective slag comprises SrO: 14-16%, CaF2: 11.5-13.5%, SiO2: 24-26%, Na2O+K2O: 12-14%, B2O3: 7-9%, Al2O3: <1%, MgO: 8-10%, La2O3: 10-12%, and the rest is carbonaceous material and inevitable impurities. Through accurate slag system design and component regulation, the protective slag has excellent performances of rapid slag formation, high lubrication and phased heat control, effectively solves the crack problem in the high-nitrogen Fe-Ni-based alloy continuous casting process, and meets the actual needs of the large-scale production of the continuous casting.

The invention belongs to the technical field of aluminum alloy casting, and relates to a casting forming method of an aluminum alloy with high thermal cracking tendency. The method comprises the following steps: adding refined powder into an aluminum alloy melt, and uniformly dispersing to obtain a mixed melt; the refined powder is micron-sized Ti powder embedded with nano-sized TiX powder, and X is selected from at least one of C and N; the mixed melt is cooled to be in a solid-liquid mixed state, aluminum alloy slurry is obtained, and the solid content of the aluminum alloy slurry is 40%-50%; and the aluminum alloy slurry is subjected to die-casting forming, and the aluminum alloy casting is obtained. By means of the preparation method, cracks of the aluminum alloy casting with the high thermal cracking tendency can be effectively eliminated, and the strength and plasticity of the casting are synchronously improved.

The invention discloses a high-strength MPP cable protection tube, belongs to the technical field of cable processing, and is used to solve the technical problem that the strength and flame retardant performance of the MPP cable protection tube in the prior art need to be further improved; the invention comprises: a flame retardant shielding layer, and an MPP layer wrapped outside the flame retardant shielding layer, wherein a modified cross-linking agent is prepared, and a modified polypropylene is radiatively cross-linked to form a complex spatial structure, zeolite is modified to obtain a modified foaming aid having a large number of active sites, and a foaming agent is filled inside the modified foaming agent to obtain a modified foaming agent, and the cross-linked polypropylene is fully foamed through the gas slow release effect of the internal pores, and the cross-linked polypropylene is used as a heterogeneous nucleation site to form a β crystal form, thereby improving the strength of the material, and the protective tube has excellent flame retardant performance through the synergistic cooperation between the hierarchical structures, and finally a high-strength MPP cable protection tube with high ring stiffness, wear resistance, flame retardancy and high electromagnetic shielding effectiveness is obtained.

The invention relates to a titanium-containing hot-dip aluminum-zinc alloy coating, a steel plate and a preparation method of the titanium-containing hot-dip aluminum-zinc alloy coating, and the alloy coating comprises the following chemical components in percentage by weight: 55.0% of Al, 1.6% of Si, 0.010%-0.050% of Ti and the balance of Zn. The alloy coating steel plate comprises a steel substrate and a titanium-containing hot-dip alloy coating attached to the surface of the steel substrate. The preparation method comprises the following steps: S1, preparing a plating solution; s2, pretreatment of the steel matrix; s3, carrying out a hot dipping process; s4, carrying out post-treatment; the method has the beneficial effects that the content of Ti in the plating solution is accurately regulated and controlled, hot dipping technological parameter optimization is combined, uniform refining of a plating layer structure is achieved, heterogeneous nucleation of Al-rich phase dendritic crystals can be efficiently promoted, the spangle size is reduced to be within 200 micrometers from 800 micrometers, meanwhile, the side effect that zinc slag is increased due to excessive Ti is avoided, the hardness of the refined plating layer is improved by 30%-50%, grain boundary distribution is uniform, and the plating layer has the good corrosion resistance. The performance is obviously improved.

The application relates to a low-temperature concentration method for reducing crystallization entrainment. The low-temperature concentration method for reducing crystallization entrainment described in the application introduces small-molecule gas to form hydrate crystal nuclei or small crystals to serve as the crystal seeds of the freeze concentration before the stage of the freeze concentration crystallization phase change, can reduce the freeze concentration crystallization supercooling degree, and promotes the freeze concentration to occur. In the stage of the freeze concentration phase change, the gas is continuously introduced to enhance the heat transfer, increase the nucleation points, promote the crystallization to occur, form more small ice crystals, effectively reduce the generation of large ice crystals, and reduce the entrainment rate. Compared with single freeze concentration, the low-temperature concentration method for reducing crystallization entrainment adopting the embodiment of the application saves time by more than 10%, reduces the ice crystal entrainment rate by more than 10%, and improves the quality by more than 15%.

An ultrasonic vibration composite wire feeding device for laser wire feeding cladding forming includes a platform moving mechanism, a laser working mechanism, a wire feeding mechanism, an ultrasonic vibration mechanism and a platform control center; the platform moving mechanism is a movable platform; the laser working mechanism includes a laser cladding head, and the laser cladding head emits laser to perform cladding processing on the workpiece; the wire feeding mechanism includes a wire guide tube and a wire feeding nozzle, and the wire enters the nozzle through the wire guide tube and is then led out from the wire feeding nozzle; the ultrasonic vibration mechanism is arranged in the wire feeding nozzle and is located on both sides of the wire, so that the wire generates high-frequency vibration, thereby coupling to the molten pool generated by the laser beam. The present invention also provides a method for an ultrasonic vibration composite wire feeding device for laser wire feeding cladding forming. The present invention combines ultrasonic vibration with wire feeding and applies it to the laser cladding forming process, and improves the surface forming effect of the cladding layer by using the auxiliary effect of ultrasonic vibration, improves the process quality, and reduces the manufacturing cost.

The invention belongs to the technical field of titanium-based cathode rollers, and discloses a low-cost process for preparing a high-homogenization titanium cathode roller, which comprises the following steps: a welding process: carrying out friction stir welding on a titanium material to obtain a welded titanium material; in the first heat treatment process, the welding titanium material is placed at the temperature of 905-915 DEG C to be subjected to heat preservation for 3-5 min and then cooled to the room temperature; repeating the first heat treatment process for 3-4 times to obtain a first heat-treated titanium material; and in the second heat treatment process, the titanium material subjected to the first heat treatment is placed at the temperature of 595-605 DEG C, heat preservation is conducted for 8-10 min, then the titanium material is cooled to the room temperature, and the uniform titanium material for the cathode roller is obtained. According to the method, the welded industrial pure titanium is subjected to circulating heat treatment-annealing composite heat treatment, the grain size can be homogenized, and therefore the titanium material meeting the quality and performance requirements of the cathode roller is obtained.