14results about How to "Avoid secondary oxidation" patented technology

The invention relates to the technical field of ferrous metallurgy casting, in particular to a drainage sand removing and recycling method and device. Comprising a mechanical arm, a lifting rotation controller, a controller arm, a sand suction cylinder, a sand conveying pipeline, a sand collecting tank and an injection pump. The lifting and rotating controller is fixedly mounted on the mechanical arm; the controller arm is connected with the lifting and rotating controller, and the lifting and rotating of the controller arm are controlled by the lifting and rotating controller; the sand suction cylinder is connected with the controller arm, the sand suction cylinder is of a U-shaped structure, and one end of the sand suction cylinder is a horn mouth used for sucking drainage sand; one end of the sand conveying pipeline is positioned above the tundish cover sprue gate, and the end part of the sand conveying pipeline is bent downwards to be connected with the other end of the sand suction cylinder; the other end of the sand conveying pipeline is connected with the sand collecting tank; the sand collecting tank is connected with an injection pump pipeline, and the injection pump provides suction power. The ladle filler sand, harmful gas in gaps of the ladle filler sand and a long nozzle and a small part of molten steel in contact with the ladle filler sand in a steel ladle can be discharged out of tundish molten steel and recycled.

This invention discloses Ni2Fe(SO4) 0.5 (OH)6(H2O) 3.85 This paper discusses / NF catalysts, their preparation methods, and applications, belonging to the field of catalyst synthesis technology. Using large-size nickel foam as a substrate, Ni₂Fe(SO₄) is directly prepared through one-step in-situ microwave-driven growth. 0.5 (OH)6(H2O) 3.85 The nanosheet array eliminates the need for subsequent loading or additional processing, simplifying the process and enhancing the bond between the catalyst and the substrate. This catalyst exhibits excellent performance in hydrogen production via water electrolysis, particularly in seawater electrolysis.

This invention discloses a continuous drawing production method for aluminum alloy cable conductors. The specific steps of the production method are as follows: S100, pre-treating the aluminum alloy rod blank to make it ready for drawing; S200, using a non-sliding wire drawing machine driven by a motor, and configuring a roughing die, a medium drawing die, and a fine drawing die in sequence according to the drawing order; S300, setting a fracture early warning processing mechanism between adjacent drawing dies, which includes an acoustic emission sensor, a temperature sensor, a diameter gauge, an eddy current flaw detector, and a tension sensor; S400, continuously drawing the pre-treated aluminum alloy rod blank through the roughing die, the fracture early warning processing mechanism, the medium drawing die, the fracture early warning processing mechanism, and the fine drawing die in sequence; during the drawing process, each fracture early warning processing mechanism collects real-time data on the acoustic emission, temperature, wire diameter, surface defects, and tension of the aluminum conductor at the corresponding position; S500, after drawing, sending the conductor into an online annealing device for continuous annealing treatment.

The invention discloses a method for refining low-carbon low-sulfur steel through vacuum carbon deoxidation, and relates to the technical field of molten steel external refining. The process method comprises the following steps: carrying out pre-deoxidation by adopting a carbon source alloy material without using a metal deoxidation material; vacuum carbon deoxidation treatment is carried out under the condition that the vacuum degree is smaller than or equal to 100 Pa; the flow of the stirring gas is controlled to be 0.2-1.0 NL / (t.min); controlling the vacuum holding time to be not more than 5 minutes and the vacuum period to be not more than 15 minutes; the method comprises the following steps: controlling the tapping temperature of a primary smelting furnace to be 1620-1680 DEG C; in the LF station refining process, the binary alkalinity of refining slag is controlled to be 5.0-8.0, and diffusion deoxidation and white slag making are conducted in cooperation with a metal deoxidizing agent; the low-carbon and low-sulfur steel is produced through organic combination of vacuum carbon deoxidation and LF refining on the premise that a metal deoxidation material is not used for pre-deoxidation, the total oxygen content in the steel can be controlled to be 15 ppm or below, and the sulfur content can be controlled to be 0.005% or below.

This invention discloses a raw material pretreatment method for zone melting purification of high-purity aluminum, belonging to the field of non-ferrous metal refining technology. The pretreatment method includes alkaline washing, acid neutralization, cleaning and drying, and vacuum-protected loading steps. High-purity aluminum raw material is immersed in a 5-8% sodium hydroxide aqueous solution at room temperature for 5-30 seconds, and removed when bubbles begin to form on the substrate. The alkaline-washed aluminum material is then immersed in an 8-12% nitric acid or acetic acid aqueous solution for neutralization for 10-20 seconds. After acid neutralization, the aluminum material is cleaned and dried, then placed in a zone melting furnace. A vacuum is drawn, and inert protective gas is introduced to atmospheric pressure or a slightly positive pressure. This method thoroughly removes oxide scale from the surface and bonding surfaces of the aluminum material, effectively preventing secondary oxidation during post-treatment transfer and loading. It creates continuous and unobstructed molten pool propagation conditions for the zone melting process, ensuring the smooth progress of the purification process and the high quality of the final product. This method is particularly suitable for eliminating oxide scale on the bonding surfaces of segmented aluminum rods to ensure the smooth operation of the zone melting process.

This invention relates to a method for preparing aluminum nitride powder with low lattice oxygen content and its application, belonging to the field of aluminum nitride technology. The invention involves pretreating aluminum nitride powder with a coupling agent, then coating it with a nitrogen-containing resin precursor through in-situ polymerization and low-temperature pyrolysis to obtain aluminum nitride powder with low lattice oxygen content. This powder is then mixed with a ternary eutectic nitride additive composed of silicon nitride, boron nitride, and germanium nitride, and subjected to low-temperature reduction, high-temperature densification, and annealing to obtain aluminum nitride material with low lattice oxygen content. Through the synergistic effect of carbothermic reduction deoxidation, lattice oxygen replacement, and nitrogen vacancy repair, extremely low lattice oxygen content is controlled, simultaneously inhibiting oxygen re-dissolution and reducing phonon scattering, significantly improving the thermal conductivity and resistance to damp heat aging of aluminum nitride ceramics. The aluminum nitride powder prepared by this invention exhibits low lattice oxygen content, excellent thermal conductivity, and resistance to damp heat aging.

This invention discloses a method for controlling inclusions in titanium-containing ultra-low carbon steel. The steelmaking process is as follows: converter process – LF process – RH process – slab continuous casting process. After aluminum deoxidation and alloying in the RH process, low-reactive slag is added. As the vacuum molten steel circulates, this slag floats to the surface and remains at the steel-slag interface, hindering oxygen transfer from the ladle slag to the molten steel. Simultaneously, this substance has the ability to adsorb inclusions in the steel. By controlling the process parameters of the RH process, oxygen transfer from the ladle slag to the molten steel is effectively prevented, avoiding secondary oxidation of titanium and aluminum elements in the deoxidized steel and controlling the inclusion content in the steel. This invention's control method effectively prevents oxygen transfer from the ladle slag to the molten steel and avoids secondary oxidation of easily oxidized elements such as titanium and aluminum in the deoxidized steel, resulting in significant economic and social benefits.

The application discloses a preparation and use method of a NbTi superconducting wire low-temperature inlay welding flux, and relates to the technical field of superconducting wires, and comprises the following steps: heating deionized water to 50-60 DEG C; respectively water-bath heating short-chain alkyl glycoside and polyethylene glycol in the water at 50-60 DEG C for 30-60 seconds; stirring the obtained hot deionized water under the condition of 100-150 r / min, and adding the obtained short-chain alkyl glycoside and polyethylene glycol; and adding xanthan gum and sodium benzoate into the obtained solution in sequence to obtain the flux. The application uses short-chain alkyl glycoside as the main component of the flux; the addition of a thickening agent realizes the physical covering of the copper material surface and prevents the secondary oxidation of the copper material, so that the completely environment-friendly flux meeting the enterprise sewage discharge standard is suitable for the low-temperature inlay welding WIC conventional product with the largest base number, and the obtained WIC product has very low surface residue.

This invention relates to a high-efficiency ultrasonic six-axis machining center, belonging to the field of aerospace material processing technology. It includes a support frame, with a PU conveyor platform fixed to its upper surface. A crossbeam is fixed to the upper surface of the PU conveyor platform, and a cutting area is located on the upper side of the crossbeam. A dustproof processing mechanism for fully enclosed processing of the cutting area is provided on the upper side of the PU conveyor platform. This high-efficiency ultrasonic six-axis machining center, through the synergistic effect of the dustproof processing mechanism, utilizes a fan A to drive airflow through a hollow plate, air duct, and air curtain gun A to form a positive pressure laminar flow air curtain surrounding the cutting area, effectively blocking the outward diffusion of fine dust. Simultaneously, a hanging pipe, side suction pipe, and suction head are used to powerfully suction the settled dust inside the sealing frame and below the PU conveyor platform, achieving dual control of dust source suppression and end-point collection. Furthermore, a rubber wheel driven by an electric push rod can dynamically seal the gap between the sealing frame and the workpiece.

This invention discloses a high-toughness asphalt mixture modified from waste plastics and rubber, and its application. It relates to the field of asphalt mixture preparation technology, comprising 80-150 parts of base asphalt, 2-8 parts of modified waste plastic particles, 4-12 parts of activated waste tire rubber powder, 100-150 parts of aggregate, and 30-40 parts of mineral filler. This invention adds silane-coupled waste plastic particles and microwave-activated waste tire rubber powder to the asphalt mixture, limiting the mass ratio of modified waste plastic particles to activated waste tire rubber powder to 1:(1.5~2). The aggregate and mineral filler fully fill the gaps, synergistically solving the defects of high low-temperature brittleness and insufficient high-temperature performance in asphalt. This results in a mixture with excellent high-temperature stability and low-temperature crack resistance, and significantly improved performance reproducibility.

The utility model belongs to the technical field of welding equipment, and discloses induction thermocompression welding equipment for aluminum-clad steel wires, which comprises an induction coil, the induction coil is of a copper hollow structure, the inner diameter of the induction coil is 20-100mm, and the induction coil surrounds the outside of a welding area; the fixing mechanism comprises a welding clamp, the welding clamp comprises a left die and a right die which are symmetrically arranged, and the left die and the right die clamp the two ends of the steel wire correspondingly; the hydraulic device comprises a liquid transmission rod and a hydraulic control unit connected with the liquid transmission rod, and the hydraulic device drives the left mold and the right mold to move through the liquid transmission rod; and the shielding gas supply unit conveys argon to the welding area through the annular nozzle. Through the synergistic effect of segmented current regulation and control and a closed-loop hydraulic mechanism, multi-parameter collaborative optimization of heating temperature, pressure and displacement can be achieved, meanwhile, the problems that heat source control is insufficient and positioning precision is poor can be solved, and welding consistency is improved.

This application discloses a vacuum plasma cleaning and protection device and method for aluminum alloys, relating to the field of aluminum alloy processing technology. The device includes a base, with a vacuum plasma cleaning chamber fixed to one side of the base surface. The vacuum plasma cleaning chamber contains an operation box, a vacuum chamber, electrode plates, a placement mesh frame, ventilation pipes, a vacuum pump, a sealing door, and a radio frequency power supply. A vacuum chamber is fixed inside the vacuum plasma cleaning chamber, and electrode plates are installed inside each vacuum chamber. A placement mesh frame is placed between the electrode plates. An operation box is fixed to one side of the vacuum plasma cleaning chamber. An ultrasonic cleaning chamber is fixed to the surface of the base, and an ultrasonic generator and a base plate are installed inside the ultrasonic cleaning chamber. The entire cleaning process is time-efficient and can effectively reduce the secondary oxide film generated during part transfer, thereby ensuring the metallurgical bonding quality between metals during welding.

The utility model discloses a pickling surface treatment device for a beta-type titanium alloy hot continuous rolling plate coil. The pickling surface treatment device comprises a pickling tank, a cleaning device and a collecting device, two groups of upper carrier rollers and two groups of lower carrier rollers are arranged in the pickling tank; a water outlet is formed in the bottom of the pickling tank; cleaning openings are formed in two ends of the pickling tank; a vent hole is formed in the top of the pickling tank; the cleaning device is arranged at one end of the pickling tank; the collecting device is connected with the pickling tank and the filter tank. The cleaning device is used for cleaning oxide skin on the surface of the titanium alloy plate, so that impurities such as the oxide skin entering a pickling solution are effectively reduced; meanwhile, the collecting device cleans impurities entering the pickling solution, and the situation that the impurities continuously react with the pickling solution, and consequently the concentration of the pickling solution is reduced is avoided.

The present application relates to the metallurgical technology field, especially relate to a kind of off-oven refining combined vacuum arc remelting preparation ultra-pure stainless steel method.The preparation method of the present application is by AOD station to transfer the crude molten steel obtained by EAF smelting to AOD refining furnace to blow oxygen refining, pre-reduction refining slag is CaO-CaF2-SiO2-MgO slag system;After pre-reduction treatment, reduction treatment is carried out, and the reduction refining slag is CaO-CaF2-SiO2-MgO slag system;The molten steel after reduction treatment is transferred to VD furnace for vacuum treatment, and the treated molten steel is transferred to ladle, then poured into mold, and ingot is obtained;After ingot is forged into electrode, ultra-pure stainless steel is prepared by VAR, with ultra-high cleanliness, coarse system inclusions is 0 level, fine system A+B+C+D inclusions≤0.5 level, effectively realize the accurate low control of aluminum content in steel, and simultaneously reduce the oxygen content and non-metallic inclusion content in steel, finally prepare high-quality ultra-pure stainless steel.