1992results about How to "Reduce oxygen content" patented technology

Disclosed is a method for preparing powder super-alloy by a near net shape. Firstly, high-purity intermediate alloy powder is prepared by the aid of vacuum melting and air jet pulverization technology. Secondly, the intermediate alloy powder and fine particle diameter metal powder (such as carbonyl nickel powder, carbonyl iron powder, reduction tungsten powder and reduction molybdenum powder) are mixed in a high-energy ball mill with protective atmosphere to obtain mixed powder. The mixed powder and paraffin base binders are uniformly premixed, feedstock with a uniform rheological performance is obtained by mixing and is formed on an injection forming machine to obtain a blank in a complicated shape. The binders are removed from the blank in the complicated shape by the aid of solvent degreasing and hot degreasing technologies, the degreased blank is sintered in the vacuum atmosphere, the sintered blank is further compacted by the aid of unjacketed hot isostatic pressure, and finally, a super-alloy part in the complicated shape is obtained by the aid of solid solution and aging treatment. Raw material powder cost and technological energy consumption are remarkably reduced, and prepared super-alloy is almost fully compact, uniform in structure and excellent in comprehensive mechanical property.

The invention relates to a device for preparing superfine micro-spherical titanium powder for 3D printing. The device for preparing the superfine micro-spherical titanium powder for 3D printing comprises an automatic feeding system, an insulation dynamic seal unit, an annular gas atomization nozzle, an atomization chamber, an arc cathode smelting well, a radiating cover, a protection cover, a powder collection tank, a supersonic gas crushing mill and a radio frequency plasma reactor. The invention further relates to a method for preparing the superfine micro-spherical titanium powder for 3D printing. The method comprises the steps that firstly a gas atomization unit is used for performing initial powder production on raw titanium powder; then crushing is used for further reducing the granularity of the titanium powder; a plasma unit is used for further processing the titanium powder; the high-energy characteristic of radio frequency plasma is used for injecting carrying gas for irregular-shaped titanium powder particles into a plasma torch, the irregular titanium powder is heated rapidly and melted, the melted particles form drops with high sphericity degree under the action of surface tension, and the drops are solidified rapidly under an ultra-high temperature gradient to form the superfine micro-spherical titanium powder good in sphericity degree, high in purity and low in oxygen content.

The invention provides a preparation method of high-purity micro-fine low-oxygen titanium powder, which belongs to the technical field of powder preparation in the powder metallurgy process. The preparation method is characterized by combining hydrogenation and dehydrogenation with a jet milling process, firstly carrying out hydrogenation treatment on a titanium sponge to prepare titanium hydride powder, then utilizing a jet mill to break the titanium hydride, then carrying out vacuum dehydrogenation, and finally utilizing the jet mill to carry out breaking gradation and vacuum package and obtaining a titanium powder product. Compared with the traditional ball milling process, the jet milling process causes no pollution, and iron impurities caused by collision of steel balls in the ball milling process can be avoided; due to jet milling and high-vacuum dehydrogenation treatment, the content of oxygen can be controlled to be lowest, and the powder taking and packaging operations are respectively carried out in a glove box, so that the powder and the air are isolated in the whole process, and further, the prepared high-purity micro-fine low-oxygen titanium powder is prepared.

The invention discloses a process for growing phi 8'' solar-grade Czochralski silicon monocrystalline by using an 18-inch thermal field. By adopting the 18-inch thermal-shielding thermal field and an upper-shaft magnetic fluid sealing device with a cooling system and combining the optimized parameter conditions of crystal-pulling processes, the invention enables the thermal field to have good heat preservation and obviously reduced energy consumption, enables gas to smoothly flow to be beneficial for the exhaustion of volatile matter, stabilizes crystallization, prolongs the service life of equipment and reduces the production cost; and in addition, the invention reduces magnet demagnetization and the evaporation of a magnetic fluid to avoid the air leakage and the slag dropping of the sealing of the magnetic fluid affecting the growth of the Czochralski silicon monocrystalline, improves the sealing performance and prolongs the service life, thereby ensuring the crystal-pulling processes of crystal leading, diameter equalization, shoulder rotation and the like to be stable and improving production efficiency and yield.

The invention relates to a preparation method for a zirconium-based amorphous alloy as well as powder and a large-sized block of the zirconium-based amorphous alloy, which belongs to the field of amorphous alloys, and is characterized by comprising the component of Zr61(Cu, Ni)27.5Al10Re1.5(at%), wherein Re is Y, La, Ce, Nd, Gd and Er, and adopting a manner of combination of the gas atomization powder milling technology and the spark plasma sintering technology. The preparation method comprises the following steps: preparing raw materials according to components of the amorphous alloy, and placing the raw materials into an induction crucible of gas atomization powder milling equipment; vacuumizing and filling inert gas for shielding; smelting to obtain an alloy solution with uniform components under the action of induction heating; pouring the alloy solution after smelting into an insulation bag at a constant speed slowly, and filling high-pressure inert gas as an atomizing medium at the same time; atomizing the alloy solution flow into small droplets under the impact of high-pressure airflow, and finally cooling to form amorphous alloy powder; collecting and screening the amorphous alloy powder; and under the protection of the inert gas, utilizing the spark plasma sintering technology to perform sintering on the amorphous alloy powder at different temperatures and pressure to obtain an amorphous alloy block.

The invention provides a preparation method of a low-oxygen molybdenum alloy. The method comprises the following steps: 1) selecting raw materials: uniformly mixing industrial molybdenum powder with Fisher particle size of 3-100 mum, powder containing strengthening elements with Fisher particle size of 3-10 mum, and carbon simple substance powder with Fisher particle size of 0.1-3 mum at certain mass ratio; 2) forming the raw materials: performing static pressing or mould pressing treatment on the mixed raw materials under pressure of 100-300 MPa to obtain formed blank; and 3) sintering the raw materials: sintering the formed blank in vacuum, hydrogen or inert gas environment at the high temperature of between 1,800 and 2,300 DEG C for 5-15 h to obtain the low-oxygen molybdenum alloy. Through the invention, the problem of high oxygen content of the molybdenum alloy prepared by powder metallurgy is solved. The low-oxygen molybdenum alloy prepared by the method can be used for preparing an X-ray tube rotating anode target, a composite target-based target, a high-temperature crucible, a hot-forging die and a high-temperature ceramic gasket.

A magnetic sputtering target which contains B and is obtained by a melting and casting method, wherein the B content is 10 at % or more and 50 at % or less, and the remainder is one or more elements selected from Co, Fe, and Ni. Based on the method of the present invention, the sputtering target, in which gaseous impurities are few, there are no cracks and fractures, and segregation of its main constituent elements is minimal, is obtained. Consequently, when sputtered with a magnetron sputtering device comprising a DC power supply, this sputtering target yields a significant effect of being able to inhibit the generation of particles during sputtering, and improve the production yield upon forming thin films.

The invention discloses a method for manufacturing large cake forgings of high-carbon and high-chromium cold working die steel. The method is characterized by comprising the following steps of: obtaining Cr12MoV or Cr12Mo1V1 steel by adopting primary smelting with an electric furnace, ladle refining and vacuum degassing process smelting; pouring the tapped steel to form a 6 to 9t octangular ingot; conveying the octangular ingot to a press at the temperature of more than or equal to 300 DEG C, forging the octangular ingot to a blank with the diameter of 300 to 700 millimeters, removing surface defects by annealing, polishing or turning and local grinding, performing cold saw cutting on the end face and blanking to form a cake blank; and heating the cake blank to the temperature of between 1,150 and 1,190 DEG C, upsetting and forging the cake blank by using the press, annealing and turning, and thus obtaining the large cake forgings of the high-carbon and high-chromium cold working die steel. By adopting the method, the yield is improved to 40 to 60 percent; and the manufactured large cake forgings of the high-carbon and high-chromium cold working die steel can comprehensively meet the requirements of hardness, impact toughness and the like and ultrasonic flaw detection quality.

The fusible flux contains, in the total mass of the flux, 15-21 mass% CaO, 11-19 mass% CaF2, 7-14 mass% MgO, 28-35 mass% SiO2, 9-17 mass% Al2O3, 6-12 mass% MnO, 0.2-1.5 mass% FeO, 0.5-1.8 mass% in total of Na2O and K2O, and <=1.0 mass% B2O3, with TiO2prescribed at <=4 mass%. Also, a value [M] provided in the formula below is set at 1.00-1.50 in the fusible flux. To provide fusible flux for submerged arc welding, fusible flux that has superb low temperature toughness of weld metal and superior welding workability in two side/one layer high-speed welding.

The invention discloses a water-containing sludge treatment method which comprises the following steps of: conveying sludge into a sludge drying machine, heating and drying; conveying semi-dry sludge into a sludge incinerator; introducing air into the sludge incinerator after passing through an ignition device; enabling high-temperature smoke generated by incinerating sludge to pass through a waste heat recycling device, and then discharging the high-temperature smoke to the air through a smoke purifying and dust-removing system; and conveying residues generated by incinerating the sludge to an ash storage bunker. The semi-dry incineration of the sludge adopts the mode that the sludge directly passes through the sludge drying machine to reach a low-dryness and semi-dry degree and then enters the incinerator for being incinerated; and in the drying process, no full-dry sludge is generated, and the back-mixing operation is not needed. The water-containing sludge treatment method has the advantages that developed and reliable sludge drying and incineration devices are adopted, thus a system has high operation reliability; the dry sludge back-mixing operation is not needed for a semi-drying system, thus the dust quantity is low and the oxygen content and temperature are low during operation, the system is high in safety, and inert gas protection is not needed; and the whole system does not generate dust and odor during operation, and is environmental-friendly.

The invention discloses a brown coal drying method and device utilizing waste heat of smoke and steam of a power plant. The drying method comprises two-time drying treatment, wherein the two-time drying treatment comprises the steps that firstly, the high-temperature smoke directly discharged by a power plant coal fired boiler is utilized for conducting first-time drying treatment on damp materials, the high-temperature smoke directly makes uniform contact with the damp materials, and intermediate materials are obtained; and secondly, the high-temperature smoke and the high-temperature steam directly discharged by the power plant coal fired boiler are utilized for conducting second-time drying treatment on the intermediate materials at the same time, the high-temperature smoke directly makes uniform contact with the intermediate materials, meanwhile, the intermediate materials make uniform contact with a heat exchange pipe inflated with the steam for heat exchange, dried materials are obtained, and second-time drying treatment is achieved. The brown coal drying method and device have the beneficial effects that the power plant waste heat serves as a heat source for brown coal drying, the running economical efficiency of a power plant generator set is improved, a system for drying the brown coal and a brown coal power generation system are integrated, efficient utilization of power plant energy and optimization of a technology system are achieved, and the brown coal drying method and device belong to the poly-generation technology of the power plant.

The invention provides a preparing method for ultra-fine high-purity Ti2AlNb alloy powder. The preparing method comprises the following steps that 1, components of a Ti2AlNb base alloy are used as ingredients and smelted into a Ti2AlNb alloy bar; 2, finish turning is carried out on the smelted Ti2AlNb alloy bar, the diameter of a processed electrode bar ranges from 10 mm to 100 mm, and the length ranges from 100 mm to 1000 mm; 3, the electrode bar is loaded into a reaction chamber, the reaction chamber is vacuumized, and helium or argon or helium and argon mixed gas is introduced into the reaction chamber; 4, plasma gun powder of PREP powder manufacturing equipment ranges from 100 kW to 300 kW, a plasma torch comprises a tungsten cathode and a copper anode, the electrode bar is not used as an electrode, the end of the electrode bar is heated to be melted uniformly, atomized drops are tossed out from the end of the electrode bar, the drops are cooled fast in an inert gas environment to form spherical particles, and the spherical particles drop into a bottom collector of the reaction chamber; 5, prepared Ti2AlNb alloy powder is screened and packaged in the inert gas protection environment; 6, the Ti2AlNb alloy powder prepared through the method has the advantages of being ultra-fine, high in purity, high in spherical degree and low in oxygen content.

The invention discloses a garbage microwave pyrolysis comprehensive treatment system and a method and equipment used by the same, aiming to solve the problems of microwave pyrolysis treatment, and the method and equipment used by the system. The comprehensive treatment system comprises a municipal solid waste (MSW) preprocessing system A, a vertical garbage continuous microwave heating low temperature cracking furnace B, a solid product activated carbon production system C, a pyrolysis gas preparation fuel gas system D, a liquid product distilled extraction light oil and fuel oil system F and a matched sewage treatment system G, wherein the MSW preprocessing system A, the solid product activated carbon production system C and the pyrolysis gas preparation fuel gas system D are respectively connected with the vertical garbage continuous microwave heating low temperature cracking furnace B; and the liquid product distilled extraction light oil and fuel oil system F is connected with the oil recovery pipeline of the pyrolysis gas preparation fuel gas system D. The invention has the advantage that: low carbon emission is realized in the treatment process under the reducing atmosphere, fixed carbon in the garbage is emitted without violent toxicity like dioxin and heavy metal solid powder, the treated wastewater can be recycled and max garbage resource recycling is realized.

The invention discloses a decompressing fuel-oil floor washing device and a method, wherein, a vehicle nitrogen-manufacturing system is utilized to generate nitrogen-rich gas, firstly, the nitrogen-rich gas is adopted to wash the upper gas-phase space of the fuel-oil for an oil tank of a refueling truck, and then the oxygen content of the gas-phase space is decreased, and then, the nitrogen-rich gas is led into the fuel oil through a gas-oil mixer or a nitrogen-rich gas distributor which is arranged under fuel-oil liquid level, meanwhile, the pressure in the oil tank of the refueling truck isled to be lower than the environmental pressure through utilizing the suctioning of a vacuum suction device, thereby effectively increasing the treatment effect of fuel-oil washing inert; compared with the ordinary pressure washing, the oxygen content in the fuel-oil after decompressing washing is lower, therefore, the airplane can be ensured have no or have trace dissolved oxygen to escape when the airplane is at cruising altitude, thereby increasing the safety of the oil tank of the airplane. Additionally, after the washing is ended, the upper gas-phase space of the fuel-oil is filled with the nitrogen-rich gas of high purity, in order to ensure that the oxygen content can not increase caused by the mixing of external air in the fuel gas after the refueling truck is parked for a long period of time.

The invention discloses a production method of ultralow-oxygen titanium-containing ferrite stainless steel, which comprises the following steps: 1) preparing molten ferrite stainless steel under a vacuum condition in a vacuum oxygen blowing decarburization furnace, wherein the carbon mass percentage content and nitrogen mass percentage content in the molten ferrite stainless steel are both less than 0.01 percent; 2) performing deoxidization, namely adding 6 to 12 kilograms of aluminum block or grains into each ton of steel and adding 10 to 28 kilograms of active lime into each ton of steel; 3) alloying silicon and aluminum, namely adding 2 to 9 kilograms of silicoferrite which contains 70 to 80 percent of silicon into each ton of steel and adding 0 to 1 kilogram of aluminum blocks or grains into each ton of steel, wherein the aluminum content is 0.02 to 0.1 percent; 4) performing desulphurization; (5) breaking vacuum; 6) softly stirring; 7) feeding titanium wires; 8) feeding silicon and calcium wires, wherein the calcium content is 5 to 30ppm; 9) softly stirring; and 10) continuously casting. The method can be used for producing ultralow-oxygen titanium-containing ferrite stainless steel, prevent or inhibit forming magnesia alumina spinel which are harmful impurities in a production process, improve product quality, prevent the water gap of tundish from being blocked in a continuous casting process and guarantee smooth production.

A production method of low melting point spherical metal powder comprises the following working procedures: melting low melting point metal or alloy, mixing with hot oil, performing primary dispersion under pressure and inert gas, performing high-power ultrasonic dispersion and emulsification, performing filtering separation, etc. The production method of low melting point spherical metal powder is characterized by high production efficiency, narrow particle size distribution of the product, low oxygen content and no screening procedure. The method is suitable for the productions of the low melting point metal and alloy powder thereof of which liquid-phase temperatures are less than 300 DEG C, such as Pb-based alloy, Sn-based alloy, Sn-Zn based alloy or non-ferrous metals such as Bi, In and the like.