54results about How to "Reduce oxygen content" patented technology

This invention discloses a method for preparing high-purity oxygen-free copper, relating to the field of metallurgical technology. The method includes multi-stage electrolytic refining, gradient-heating vacuum melting, inert gas-protected refining, electron beam melting, hydrogen plasma arc melting, directional solidification, and post-treatment steps. The multi-stage electrolytic refining utilizes a specific component electrolyte and periodically commutated current; vacuum melting is combined with bidirectional electromagnetic stirring; inert gas-protected refining is combined with a gradient reduction composite covering agent; electron beam and hydrogen plasma arc melting achieve deep purification and deoxidation; and directional solidification and two-stage annealing ensure product performance. The high-purity oxygen-free copper prepared by this invention has a conductivity of 102.3% IACS, a copper content ≥99.9999%, and an oxygen content <1.0 ppm. It exhibits high purity, low oxygen content, and excellent conductivity. The process is stable and controllable, making it suitable for high-end electronics applications.

This invention discloses a method for preparing a partitioned buffer layer, a patterned composite substrate, and the same method. The preparation method includes: providing a patterned substrate; the three-dimensional pattern on the surface of the patterned substrate has inclined sidewalls, and gap planes exist between adjacent three-dimensional patterns; forming an argon ion accumulation layer, utilizing the repulsive effect between argon ions to bombard the patterned substrate, making the inclined sidewalls positively charged; sputtering negatively charged aluminum atoms that electrostatically adsorb onto the inclined sidewalls to form an aluminum atom thin film; the sputtered aluminum atoms react with at least nitrogen gas to form a first thin film on the gap plane, and the aluminum atom thin film reacts with nitrogen and oxygen gas to form a second thin film on the inclined sidewalls; the first and second thin films constitute a buffer layer. This invention achieves partitioned film formation of a buffer layer on a patterned substrate, where the film elements, proportions, and crystal quality differ and are controllable in different regions, effectively matching the stress and crystal quality during epitaxial growth and reducing defect density.

The invention belongs to the technical field of steel rolling, and particularly discloses a system and method for reducing nitrogen oxides in flue gas of a steel rolling heating furnace, the system comprises a heating furnace, the heating furnace is communicated with a detection pipe, the detection pipe is sequentially provided with a dust remover, a desulfurization device, a cooler, a CO concentration sensor and an O2 concentration sensor, and the CO concentration sensor and the O2 concentration sensor are electrically connected with a PLC. And an air valve and a gas valve of the heating furnace are electrically connected with the PLC. The problems that in the prior art, due to the fact that an oxygen content real-time monitoring feedback mechanism is lacked, control over a valve deviates, dynamic matching of the atmosphere in a furnace cannot be achieved, and then NOX emission cannot be effectively controlled are solved. Real-time furnace atmosphere data are detected, the PLC is used for being in linkage with the air valve and the gas valve, closed-loop feedback control is formed, the air-fuel ratio can be dynamically adjusted, and therefore the emission amount of nitric oxide is reduced.

This invention belongs to the field of electronic packaging and soldering materials technology, and relates to a lead-free solder powder for reflow soldering and its preparation method. This lead-free solder powder is based on a Sn-Ag-Cu alloy system, and achieves melt purification, β-Sn grain refinement, and interface IMC stabilization by adding trace amounts of Ce and Ni elements. Its composition, by mass percentage, is: Ag 2.9%–3.1%, Cu 0.45%–0.55%, Ce 0.01%–0.10%, Ni 0.01%–0.05%, with the balance being Sn and impurities. During preparation, a Ce-Ni master alloy is used to introduce microalloying elements, followed by vacuum melting, inert gas atomization, and surface treatment to obtain spherical solder powder. The resulting solder powder has low oxygen content, good wettability, slow interface IMC growth after reflow, high solder joint strength, and excellent thermal cycling reliability, making it suitable for high-reliability electronic packaging applications.

The application provides a single crystal furnace cyclone air distribution device, a single crystal furnace and a furnace protective gas flow optimization method, and belongs to the single crystal production equipment field.The device is arranged at the air inlet of the single crystal furnace and is located directly above the single crystal rod position in the furnace.The cyclone cylinder is arranged at the uppermost side of the single crystal furnace and is in a circular ring column shape.A gas flow guide structure is arranged on the inner wall of the circular ring column shape to guide the protective gas to form a cyclone.The air inlet is arranged on the circular top surface of the circular ring column shape and includes at least two air inlet holes that are symmetrically distributed with the center as the center, so that the protective gas enters the sealed cyclone cylinder from the air inlet.The circular top surface has a predetermined thickness, and when the circular air inlet hole of the air inlet penetrates the circular top surface, a bevel with a predetermined angle is formed, and the bevel direction is tangent to the spiral partition direction of the internal cyclone cylinder.The application improves the eccentric turbulent flow problem and improves the uniformity and oxygen reduction effect of the protective gas flow in the single crystal furnace.

This utility model discloses a quick-release water atomizing tundish positioning device, relating to the field of metal powder material manufacturing technology. The utility model includes a sealed air inlet cylinder, with a retaining ring and a positioning ring fixedly connected to the top and bottom of the inner cavity of the sealed air inlet cylinder, respectively. This utility model creates a sealed working environment through the sealed air inlet cylinder. Combined with the pores on the surface of the distribution ring, the externally input inert gas is evenly distributed within the sealed space, preventing the molten steel from contacting air before atomization, thus reducing the oxygen content at the source. Simultaneously, the heat-insulating positioning cylinder and the internal insulation material reduce heat loss from the molten steel in the tundish, ensuring the molten steel always maintains good fluidity. Furthermore, through the multiple positioning functions of the retaining ring, positioning ring, positioning frame, and the groove on the top of the heat-insulating positioning cylinder, the tundish is accurately placed, ensuring that the tundish opening and the spray plate remain coaxially aligned, effectively preventing the molten steel from sticking to the spray plate and causing channel blockage, thus preventing abnormal production stoppages.

The invention relates to an air supply device (1) for a fuel cell system (2, 3), having a flow compressor and a drive motor (4) for the flow compressor, wherein the flow compressor has two compressor wheels (6, 7) which are configured to be substantially symmetrical and are arranged on a common shaft (5) together with the drive motor (4) arranged between the two compressor wheels. The air supply device according to the invention is distinguished in that the two compressor wheels (6, 7) are connected on the pressure side to two systems (2, 3, 10, 13) which are connected aerodynamically non-permanently. Furthermore, a fuel cell system (2, 3) using such an air supply device (1) is claimed.

The application discloses a method for controlling the bottom of a furnace and reducing the end-point carbon-oxygen concentration product by separately controlling the flow of bottom blowing branch pipes, and belongs to the field of metallurgical manufacturing. In the application, m kinds of bottom blowing modes are arranged at the bottom of a converter, and each mode corresponds to each production process, and each mode is selected to separately control or jointly control v bottom blowing branch pipes. When the joint control is performed, the flow setting parameters of the v branch pipes are the same, and the m kinds of mode parameters are selected. When the separate control is performed, the flow of the v branch pipes is separately controlled, and the m*v kinds of mode parameters are selected. By reforming the bottom blowing control system of the converter, each gas supply element is designed to realize independent automatic control of the gas flow, the bottom gas supply intensity can be adjusted in a large range, the stirring force in the converter can be controlled, the bottom blowing effect can be maximally exerted, the slag-steel reaction balance can be promoted, the oxygen content in the steel can be reduced, and the steel quality can be improved.

The present invention provides a solid fuel production system having a sewage sludge solid fuel deodorizing heat treatment device, including a mixer mixing sludge or an additive to produce a first mixture; a first dryer performing first drying in such a manner that the first mixture supplied from the mixer reaches a first moisture content; a second dryer producing a dried mixture of a second moisture content by heating and drying the first mixture of the first moisture content; a former molding the dried mixture by pressure molding; and a heat treatment device performing heat treatment on the solid fuel put into the inside after molding is completed to remove odor generated from the solid fuel molded in the former.

This invention provides a high DC bias iron-silicon composite magnetic core, wherein the silicon content of the high DC bias iron-silicon composite magnetic core does not exceed 5.5%; the high DC bias iron-silicon composite magnetic core is insulatingly coated with Al₂O₃ / EP nanocomposite material during its preparation process to form an insulating coating; the insulating coating is further coated with a parylene coating. The high DC bias iron-silicon composite magnetic core of this application has a significantly reduced oxygen content and a significantly improved DC bias performance.

The invention belongs to the technical field of semiconductor manufacturing, and particularly relates to a three-step wet chemical cleaning method for a gallium nitride single crystal substrate. The method comprises the following steps: pre-cleaning the surface of a GaN single crystal substrate, cleaning with concentrated sulfuric acid and hydrogen peroxide, and flushing with deionized water; soaking in a BOE solution and then washing with deionized water; soaking in a mixed solution of hydrochloric acid and hydrogen peroxide, washing with deionized water, and finally drying. According to the method, step-by-step targeted removal and synergistic interaction of different pollutants are realized through a specific three-step sequential cleaning method. The pre-cleaning step aims at removing large-size particles attached to the substrate in the machining and transporting process, a consistent starting point is provided for follow-up fine chemical cleaning, and macroscopic pollutants are prevented from interfering with chemical reactions or causing secondary pollution.

The application discloses a preparation method and application of aluminum nitride powder, and the preparation method comprises the following steps: S1: coating organic matter on the surface of aluminum oxide and carbonizing to obtain a carbon-coated precursor; S2: mixing and grinding the carbon-coated precursor with carbon material, and then sintering in a nitrogen atmosphere to obtain a sintered product; and S3: mixing the sintered product with a separation liquid, and separating to obtain the aluminum nitride powder; the separation liquid comprises solvent A and solvent B, the polarity of the solvent A is greater than that of the solvent B, the density of the solvent A is greater than that of the solvent B, and the polarity difference between the solvent A and the solvent B is greater than 5. The preparation method of the application can promote complete nitriding, avoid agglomeration between aluminum nitride particles, and thus prepare the aluminum nitride powder with a higher specific surface area, low oxygen content and low carbon impurity content by closely contacting the organic matter with the aluminum oxide particles and carbonizing, and then grinding and sintering with the carbon material.

The utility model belongs to the technical field of combustors, and discloses a heat storage combustion flat single radiant tube device which is provided with a heat storage type combustor and a flame radiation flat single tube, and flames combusted by the heat storage type combustor are jetted in the flame radiation flat single tube. Formed flue gas flows back into the heat accumulating type combustor along the pipe wall of the flame radiation flat single pipe and is exhausted after heat is absorbed by a heat accumulator; the heat storage combustion flat single radiant tube device integrates combustion, heat transfer, smoke exhaust and heat storage, and during working, air and smoke need to be reversed, and fuel does not need to be reversed; the utility model has the beneficial effects of small volume of installation space in the furnace, compact structure, uniform temperature of the radiant tube wall and the like.

The utility model provides a nitrogen-filled sealing device which comprises a base, a nitrogen-filled sealing device and a nitrogen-filled sealing device. The base supports a penicillin bottle; the protective shell is arranged above the base, the protective shell is configured to cover the penicillin bottle, a containing space is formed in the protective shell, the protective shell is provided with a through hole, and the through hole is configured to receive the protective gas filled in the containing space so that the penicillin bottle can contain the protective gas; the first lifting mechanism is connected with the protective shell, and the first lifting mechanism drives the protective shell to move relative to the base in the vertical direction; and the adsorption pressing piece is arranged in the protection shell and can move in the vertical direction, and the adsorption pressing piece is configured to suck up a bottle plug of the penicillin bottle and press a bottle opening of the penicillin bottle. According to the nitrogen filling and sealing device, the risk that radiopharmaceutical overflows in the nitrogen filling and sealing process of the penicillin bottle can be reduced, and the convenience and safety of sealing and nitrogen filling are improved.

This utility model discloses a deoxygenation device for boiler water treatment, relating to the field of water treatment technology. It includes a cylindrical body with an inlet pipe fixedly connected to its upper end. A rotating shaft is coaxially connected to the inside of the cylindrical body, and a sliding tube is slidably connected to the rotating shaft. A flow-turbating mechanism is provided on the sliding tube, comprising multiple agitator plates evenly distributed along the circumference of the sliding tube. The end of each agitator plate near the rotating shaft is hinged to the lower end of the sliding tube. A transmission mechanism is provided between the agitator plates and the cylindrical body, driving the agitator plates to rotate around the rotating shaft while simultaneously moving them up and down. The beneficial effect is that the rotating shaft drives the sliding tube to rotate, causing the agitator plates to rotate around the sliding tube, while simultaneously moving the agitator plates up and down, thereby promoting the mixing of the deoxygenating agent and water inside the cylindrical body. This ensures the deoxygenating agent is evenly distributed in the water, reducing the oxygen content and improving mixing efficiency.

The utility model discloses a biomass gasification furnace closed material bin of accurate weighing, include: hopper, material bin body, gasification furnace and support frame, the outlet of hopper is located the top of material bin body, and the feed inlet of material bin body corresponds, gasification furnace is located the below of material bin body, and the import of gasification furnace is linked together with the discharge port of material bin body, support frame includes: stand and crossbeam, and multiple crossbeams set up between two adjacent stands, hopper sets up at the top of top crossbeam, and material bin body outside is provided with weighing sensor, and weighing sensor places at the top of middle crossbeam, the closed material bin in the utility model is good in leakproofness, and can provide accurate data for the calculation of gas production rate.

The invention discloses an iron-silicon-chromium soft magnetic powder material which comprises the following raw materials in percentage by mass: 2-7% of silicon, 2-10% of chromium, 0-5% of nickel and cobalt and the balance of iron, the use amount of nickel and cobalt is greater than 0, and the sum of the use amount of silicon, chromium, nickel, cobalt and iron is 100%. The iron-silicon-chromium soft magnetic powder material is high in powder apparent density and tap density, low in powder oxygen content and high in inductance value and magnetic conductivity, and can meet the high-performance requirements of electronic components on metal soft magnetic alloy powder.

This invention discloses a method for preparing oxygen-free copper, relating to the field of metallurgical technology, comprising the following steps: Step S1, raw material pretreatment; Step S2, gradient melting and deoxidation; Step S3, gradient refining; Step S4, directional solidification casting; Step S5, heat treatment. The oxygen-free copper prepared by this method exhibits good mechanical properties, excellent electrical conductivity and heat resistance, and low oxygen content.

A method for preparing nickel powder through electrolysis of nickel sulfate waste liquid in one step comprises the steps that the nickel sulfate waste liquid is diluted to a certain concentration by controlling the reduction degree of Ni < 2 + > under different cathode conditions, and different nickel electrolysis products are selectively prepared in the diluent; ti plated TaO2 / I rO2 alloy is used as an anode, a Ti sheet is used as a cathode, electrolysis is carried out under the conditions that the current density is 30-2000A / m < 2 >, the electrolyte temperature is 20-60 DEG C and the nickel ion concentration is 0.025-1.0 mo l / L, and nickel powder is obtained through electrodeposition on the cathode after electrolysis is finished; a circulating pump is used for recycling waste liquid; the electrolytic nickel powder prepared through the method is simple in required equipment, short in technological process, mild in condition, low in production cost, high in efficiency, environmentally friendly, suitable for one-step preparation of the nickel powder through the high-impurity nickel sulfate waste liquid and suitable for one-step preparation of the electrolytic nickel powder through the pure nickel sulfate solution. The method is especially suitable for environmental protection enterprises of nickel-containing waste liquid.

The application discloses a production process of high-molybdenum super-high-manganese steel material, which comprises the following steps: (1) knotting the crucible of basic material (fused magnesite) of medium-frequency furnace; (2) preparing material; (3) charging and smelting slagging material; (4) adjusting chemical composition; (5) purifying in the furnace; (6) making new slag; (7) controlling temperature and tapping; (8) inoculation treatment; (9) second purification treatment in the ladle; and (10) temperature measurement and pouring. Through optimization of components and process, the mechanical properties of the high-molybdenum super-high-manganese steel material produced by the application can reach: tensile strength σb≥740.6 MPa; yield strength σs≥481.2 MPa; elongation δ≥25.6%; impact toughness αk≥120.3 J (U-shaped notch), initial hardness ≥222.5 HB, and oxygen content <20 ppm. The high-molybdenum super-high-manganese steel material produced by the application has excellent mechanical properties and can meet the production requirements of thick-section super-high-manganese steel castings.

The present application relates to the technical field of high-nitrogen stainless steel smelting, in particular to a high-efficiency high-nitrogen high-purity high-nitrogen steel preparation method by pressurizing bottom blowing of ammonia gas and pressurizing nitrogen gas on the surface of molten steel, comprising the following steps: vacuumizing the alloy material, filling argon, vacuumizing again after the raw material is completely melted, filling nitrogen gas into the furnace cavity of the pressurized induction furnace to the target nitrogen pressure, entering the molten steel surface gas phase nitrogen enrichment stage, controlling the bottom blowing ammonia gas pressure by adjusting the output pressure of the ammonia gas cylinder, entering the pressurized bottom blowing ammonia gas and molten steel surface pressurized nitrogen gas collaborative nitrogen enrichment stage, switching the bottom blowing ammonia gas to bottom blowing nitrogen gas, entering the molten steel surface pressurized and bottom blowing nitrogen gas collaborative nitrogen enrichment stage, and completing the preparation of high-efficiency precise nitrogen enrichment and high-purity high-nitrogen steel. The present application solves the problem of high cost caused by adding nitriding alloy in the traditional preparation process, avoids the problem of inclusions caused by adding deoxidizing and desulfurizing agents, reduces the content of oxygen and sulfur in the steel, and meets the demand of high-end equipment manufacturing for high-purity high-nitrogen steel products.

The invention relates to the technical field of monocrystalline silicon crystal growth, in particular to a crystal pulling method suitable for a single heater thermal field. A crystal pulling method suitable for a single heater thermal field comprises the following steps: when material melting is completed and crystal pulling is carried out, controlling the upper edge of a heater to be above the upper edge of a crucible, and adjusting the vertical distance between the upper edge of the heater and the upper edge of the crucible to be 50-150mm; when crystal pulling enters an equal-diameter stage, along with growth of the crystal, the height of the heater is adjusted, so that the vertical height of the surface of the silicon melt and the upper edge of the heater is gradually increased. According to the crystal pulling method, a single heater is adopted, the number of heaters and matched parts are reduced, the thermal field structure is greatly simplified, and therefore the manufacturing cost of a thermal field is reduced; meanwhile, the bottom heater is omitted, so that invalid work of the bottom heater in the crystal pulling process is avoided, and the overall energy consumption is reduced.

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.

The application relates to the technical field of rare metals, and discloses a method for preparing metal hafnium by reduction, which comprises the following steps: S1, mixing hafnium oxide, calcium and calcium chloride, and carrying out a thermal reduction reaction under a protective gas to obtain a solid mixture; S2, carrying out acid pickling, water washing and drying on the solid mixture to obtain metal hafnium powder; S3, melting the metal hafnium powder under the protective gas, and cold-pressing and forming the metal hafnium powder to obtain the metal hafnium; the calcium chloride is composed of first calcium chloride and second calcium chloride, and the first calcium chloride and the second calcium chloride are in different forms. Through the technical scheme, the problem of high oxygen content in the related art when metal hafnium is prepared by reduction is solved.

This invention belongs to the field of liquid metal field emission electric propulsion technology, specifically relating to a method for wetting porous metal materials with liquid metal. Addressing the problem of insufficient wetting affecting the overall performance of the liquid metal field emission electric propulsion system due to issues such as interface oxidation, pore degassing, and enhanced wetting drive during the fabrication of the emitter from porous metal materials through liquid metal wetting, this invention first removes impurities from the surfaces of the porous metal and liquid metal through multiple steps including ultrasonic cleaning, dilute acid immersion, and organic solvent cleaning, reducing the contact angle and improving wettability. Then, a tube furnace is used to achieve the required oxygen-free and high-temperature environment for wetting through gas washing, vacuuming, and heating. The wetting temperature is set to 800-1000℃, which further converts and sublimates oxides and reduces the surface tension of the liquid metal, thereby improving wettability. This invention's wetting method is low-cost, simple in process, and provides good wetting results.

This invention relates to the field of aluminum powder screening technology, specifically disclosing a high-safety automated aluminum powder processing system, comprising: an automatic suction system, a drying system, an automatic weighing and dispensing system, an inert gas protection system, a negative pressure conveying and filtration system, an automatic dust removal system, as well as an oxygen content monitoring system, a control system, a monitoring system, and a power system; aluminum powder is sequentially loaded into aluminum bags through the automatic suction system, the drying system, and the automatic weighing and dispensing system; the inert gas protection system fills the automatic suction system, the drying system, and the automatic weighing and dispensing system with inert gas, which is then passed through the drying system and the automatic weighing and dispensing system to the negative pressure conveying and filtration system and the automatic dust removal system for filtration and dust removal.

This utility model discloses a boiler flue gas waste heat recovery system, relating to the field of boiler equipment technology, and its main purpose is to provide a boiler flue gas waste heat recovery system. The main technical solution of this utility model is as follows: a boiler flue gas waste heat recovery system, comprising: a boiler component, one end of an exhaust pipe connected to the boiler body and the other end connected to a dust collector; a heat exchange component, comprising a soft water tank, a first water supply pipe, a drain pipe, and a heat exchanger, the heat exchanger being installed on the exhaust pipe and located between the boiler body and the dust collector, one end of the water supply pipe connected to the soft water tank and the other end connected to the heat exchanger, and one end of the drain pipe connected to the heat exchanger; a water supply component, comprising a deaerator and a second water supply pipe, one end of the deaerator connected to the drain pipe and the other end connected to the second water supply pipe, the second water supply pipe being connected to the boiler body. This utility model is mainly used to recover heat from flue gas.

The utility model discloses a titanium alloy powder cold isostatic pressing mould charging device, including the upper and lower intercommunication's material tank and vacuum box. The material tank is connected with the vacuum box feed port through the discharge port of taking the valve, and vacuum system, glove port and observation window are equipped for the vacuum box, and the vibration dish, rotatory disc and weighing device are established at the bottom of the box, and the cold isostatic pressing mould is placed on it. The device prevents titanium powder oxidation through the vacuum environment, and the vibration uniform material is combined with the rotation material distribution and improves the uniformity of charging, and the weighing device realizes accurate control, and the quality of cold isostatic pressing blank is improved obviously.

The present invention relates to a chromium sintered body, a method for manufacturing the same, a sputtering target, and a method for manufacturing a substrate with a chromium film. The chromium sintered body contains particles. The average KAM value of the particles is 2° or less, and the average particle diameter of the particles is greater than 150 μm and 400 μm or less.

The application discloses a titanium alloy powder for additive manufacturing and a preparation method thereof, and the preparation method comprises the following steps: S1, mixing 95-99 parts of titanium raw material, 0.1-1 parts of carbon nanotubes and 1-5 parts of zirconium powder, and then performing hydrogen absorption treatment to obtain titanium hydride material; S2, mixing the titanium hydride material obtained in the step S1 with 2-10 parts of aluminum powder, 1-5 parts of vanadium powder and 0.01-0.5 parts of rare earth element powder, and then performing high-energy ball milling to obtain titanium hydride powder material; and S3, placing the titanium hydride powder material obtained in the step S2 into a vacuum sintering furnace to perform dehydrogenation treatment, and obtaining titanium hydride-dehydrogenated powder material. The titanium alloy powder prepared by the application has the advantages of high compactness and low oxygen content.