34results about How to "Avoid oxygenation" patented technology

The invention discloses titaniferous stainless steel electroslag remelting casting powder which is prepared from the raw materials in parts by weight as follows: 46.0-50.0 parts of fluorite, 20.0-24.0 parts of alumina powder, 18.5-22.5 parts of lime, 3.5-5.5 parts of fused magnesite, 2.0-4.0 parts of titanium dioxide as well as other components: 0.0-0.6 part of SiO2, 18.0-22.0 parts of CaO, 20.0-24.0 parts of Al2O3, 4.2-5.8 parts of MgO, 2.0-4.0 parts of TiO2, 45.0-51.0 parts of CaF2, less than 0.03 part of S and less than 0.03 part of C. Slag is formed by the casting powder according to strict quality control standard so as to ensure that the impurity content is low, the purity is high and the slag is dry and free from moisture. In the electroslag remelting process, desulfuration and deoxygenation effects are enhanced, the resistivity is improved, and the casting powder is free from cutoff in arcing, good in lubrication and relatively easy to popularize and apply.

The invention provides a hard alloy large pipe drawing mold and a preparation method. The hard alloy large pipe drawing mold comprises the following raw material ingredients in percentage by weight: 14 to 20 percent of cobalt with a particle size of 1.0 to 3.0mu m, and the balance of tungsten carbide with a particle size of 4 to 5mu m. The preparation method comprises: raw material preparation, wet milling, drying, pressing, forming agent removal and sintering, wherein in the drying step, wax or butadiene rubber is used as the forming agent; the drying with the wax as the forming agent is spray drying; the forming agent remove is performed in a dewaxing and sintering integrated furnace or bell-type furnace; and the sintering is pressure sintering, and during the sintering, the temperature is raised within 11 to 13 hours till a liquid phase of the product appears, then about 40 mbars of high-purity argon is introduced into the furnace till the final sintering temperature of 1,390 to 1,400 DEG C, the temperature is kept for 50 to 60 minutes, then about 50 to 60 bars of high-purity argon is introduced, the temperature is kept continuously for 50 to 60 minutes, and the product is cooled to room temperature. The Rockwell hardness of the hard alloy large pipe drawing mold of the invention is more than or equal to 83HRA, the bending strength of the hard alloy large pipe drawing mold is more than or equal to 2,200MPa, and the density of the hard alloy large pipe drawing mold is 13.40 to 14.20g/cm<3>. And the hard alloy large pipe drawing mold has the advantages of high hardness, high wear resistance, uniform product performance, fragmentation resistance and long service life.

The invention provides a preparation method of vanadium aluminum titanium alloy, and relates to a preparation method of high vanadium titanium material. The preparation method of the vanadium aluminum titanium alloy is characterized in that the preparation process is that firstly, a metallothermic reduction method is adopted and aluminum is taken as a reducing agent to reduce vanadium pentoxide and titanium dioxide, so as to prepare one-step vanadium aluminum titanium alloy; and then the well-prepared one-step vanadium aluminum titanium alloy is crushed and secondarily refined in a vacuum medium frequency induction furnace, and the final product of the vanadium aluminum titanium alloy is obtained. According to the method provided by the invention, the metallothermic reduction method (one-step method) is adopted and the aluminum is taken as the reducing agent to prepare the vanadium aluminum titanium alloy, then the vanadium aluminum titanium alloy is melted in the vacuum induction melting furnace and crushed, and finally a product of the aluminum titanium alloy is obtained. By adopting the method, the problem of high oxygen content of traditional Al-V85 alloy is solved, and the vanadium aluminum titanium alloy with relatively low oxygen content is obtained through adding a titanium element while the proportion of aluminum to vanadium in the Al-V85 alloy is not changed, and the oxygen content of a titanium alloy ingot is successfully controlled.

The invention relates to the fields of novel renewable energy technology and aquaculture equipment, and especially relates to a wave energy oxygen supply device utilizing a horizontal-movement float. The device comprises an air compression pipe, a float, columns, fixed pulleys, steel cables, a piston, air check valves, underwater check valves, a rail, and fish farming chambers. The device is characterized in that: the entire device is arranged on a seabed base; a sealed bin is arranged above the columns, the air compression pipe and the piston are arranged in the bin; the rail and the float are distributed between two columns; the two ends of the rail are respectively fixed on the columns; the float is connected with the piston through the fixed pulleys and the steel cables; the fish farming chambers are positioned on two sides of the device, and communicate with the oxygen supply device through the air compression pipe. With the design provided by the invention, air flow in the air compression pipe can be driven by the changes formed by seawater flow rate transferred through waves, and the oxygen supply of the fish farming chambers is realized. The device has high reliability, and is easy to manufacture, mount and move.

The invention discloses magnesium-containing steel 45 and a preparation process thereof, and relates to the technical field of steel production. The steel 45 comprises the following chemical components of, in percentage by mass, 0.45%-0.48% of C, 0.17%-0.37% of Si, 0.65%-0.80% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, 0.0005%-0.0020% of Mg, and the balance iron and inevitable impurities. On the basis of ensuring the safe production of the steel 45, the inclusion in the steel is modified by feeding a magnesium-silicon cored wire into molten steel at the final stage of refining, so that the inclusion in the steel is converted into the fine and dispersively distributed sulfide-oxide composite inclusion, the rating of the inclusion is optimized, and the comprehensive mechanical property of the steel 45 is improved.

The invention discloses a smelting method of an electrode bar base material for non-protective-atmosphere electroslag remelting of H13 steel, and belongs to the field of ferrous metallurgy. The smelting method of the electrode bar base metal for non-protective-atmosphere electroslag remelting of the H13 steel comprises the steps of electric furnace steelmaking, LF furnace refining, VD vacuum degassing, pouring and the like. According to the smelting method, by increasing the content of [Al] in the steel, adjusting the composition of the LF slag, and adjusting a VD argon soft blowing system to be proper, the content of inclusions in the molten steel can be effectively reduced, and the cleanliness of the electrode bar base material is improved. By the adoption of the electrode bar base material prepared through the method, secondary oxidation of molten steel in the electroslag remelting process can be avoided, so that the content of oxidation-system inclusions in the H13 steel manufactured through non-protective-atmosphere electroslag remelting is reduced, and the quality of steel obtained after non-protective-atmosphere electroslag remelting is improved. The problems that an existing electrode bar base material used for non-protective-atmosphere electroslag remelting of the H13 steel is low in cleanliness and prone to secondary oxidation in the non-protective-atmosphere electroslag remelting process can be effectively solved.

The invention provides a rare earth heavy rail steel rare earth adding method and rare earth heavy rail steel. According to the rare earth adding method, in the production of the rare earth heavy railsteel, the rare earth heavy rail steel is sequentially subjected to LF refining and VD refining until the mass fraction of oxygen in molten steel is less than or equal to 10 ppm; on the premise thatthe mass fraction of oxygen in the molten steel is less than or equal to 10 ppm, the rare earth alloy with the rare earth content of more than or equal to 99 wt% is added into the molten steel by adopting a direct input method. According to the adding method, on one hand, pure rare earth is adopted to ensure that the rare earth content is over 99%, the oxygen content in the rare-earth alloy can begreatly reduced, the rare earth can be rapidly molten into the molten steel, and oxygenation is avoided due to the fact that the rare earth is uniformly stirred for a long time; on the other hand, after the LF refining and the VD refining, the oxygen content in the molten steel of the heavy rail steel is reduced to be less than 10 ppm, so that the oxidation of dissolved oxygen in the molten steelto the rare earth is avoided, and the rare earth yield can be improved.

The invention belongs to the fields of a novel renewable energy technology and aquaculture devices, and particularly relates to a novel ecological fishing tank utilizing wave energy. The novel ecological fishing tank utilizing wave energy comprises an air chamber, fish culture chambers, a one-way air inlet valve, one-way air outlet valves and an anchor chain. The fish culture chambers are located on the two sides of the ecological fishing tank and are communicated with the two sides of the ecological fishing tank through the one-way air outlet valves. The fishing tank is integrally fixed to the seabed through the mode that the anchor chain is connected with a high holding power anchor. The air chamber is arranged at the upper portion of the fishing tank. The one-way air inlet valve is arranged at the top of the air chamber. The novel ecological fishing tank utilizing wave energy is characterized in that the water level in the air chamber in the fishing tank changes along with transmission of wave, air in the air chamber is compressed through changes of the water level and is driven to flow, and oxygen is transmitted to the fish culture chambers communicated with the fishing tank. According to the novel ecological fishing tank utilizing wave energy, because the water level in a tank body changes in the wave transmission process, the compressed air in the air chamber is driven to flow, and oxygen is transmitted to the fish culture chambers. The novel ecological fishing tank utilizing wave energy has higher reliability and is easy to manufacture, install and move.

The invention belongs to the field of novel renewable energy technologies and aquaculture devices, and particularly relates to a floating wave energy oxygen supply device using a gravity pendulum. The floating wave energy oxygen supply device comprises air compressing pipes, a pendulum plate, upright posts, fixed pulleys, a steel cable, a piston, air one-way valves, underwater one-way valves, a rotating shaft and fish raising chambers. The floating wave energy oxygen supply device is characterized in that the whole floating wave energy oxygen supply device is installed on a sea foundation through the upright posts; a closed cabin is installed above the upright posts; the air compressing pipes and the piston are installed inside the cabin; the rotating shaft and the pendulum plate are installed between the two upright posts; the rotating shaft is fixed on a bottom plate of a power-generating cabin; the pendulum plate is connected with the piston through the steel cable and the fixed pulleys; the fish raising chambers are positioned on two sides of the floating wave energy oxygen supply device, and are communicated with the oxygen supply device through the air compressing pipes. Through design of the floating wave energy oxygen supply device, by virtue of change of seawater flow rate along with transmission of wave, air in the air compressing pipes can be driven to flow and oxygen is supplied for the fish raising chamber, the floating wave energy oxygen supply device has relatively high reliability and is easy to manufacture, install and move.

The invention relates to a method for preparing pigment carbon black from waste and abandoned tires, and belongs to the technical field of waste reutilization. The waste and abandoned tires are used as raw materials to be subjected to mixed ball milling and pyrolysis with auxiliary agents; then, obtained materials are mixed with a sodium hydroxide solution and glacial acetic acid; next, mixed reaction is performed with dimethylformamide, tyrosine and the like; finally, low-temperature oxidization is performed, so that the pigment carbon black is prepared. The method has the advantages that thewaste and abandoned tires are sufficiently utilized; the environment pollution and the resource waste are avoided; the problem of reduction of oxygen content on the surface of the carbon black duringthe high-temperature oxidization on the carbon black is also solved, so that the oxidization can be performed at low temperature.

The invention relates to a rolling preparation method for a large-specification molybdenum-niobium alloy target material. The method specifically comprises the following steps that raw material powder of the target material alloy is uniformly mixed, cold isostatic pressing, hot isostatic pressing, rolling with a sheath, and then leveling and annealing are performed, the sheath is removed, and the mixture is machined to a specified size, wherein a cogging temperature of rolling with the sheath is 1400 DEG C-1450 DEG C, and the pass deformation quantity is 20%-30%, and cooling and rolling are performed until a final rolling temperature is 1250 DEG C. According to the method, a molybdenum-niobium target blank can be rolled and produced, according to the equipment size, the large-specification size can be achieved, the long-strip target material with the size of 2000 mm or above can be rolled, and compared with a sintered target material, the rolled target material is high in density and can reach the theoretical density.

The invention relates to an electroslag re-melting process for controlling aluminum uniformity of high-aluminum steel. The electroslag re-melting process is characterized in that a binary slag system is adopted, wherein parts of CaF2 and Al2O3 are replaced by returned slag of the same steel type. During slag melting, aluminum powder which accounts for 2%-4% of the slag is added to remove unstable oxides in the slag. Aluminum burning loss is severe because of large current fluctuation in first two hours of a re-melting initial stage, the aluminum powder is added to regulate aluminum in electrode blank until the aluminum amount exceeds upper limit of a range by 0.1%, and then, aluminum powder is added according to component upper limit for deoxidation. A melting rate (kg/h) during the electroslag re-melting process is equal to (0.75-0.85)*an average diameter (mm) of a crystallizer, so that surface smooth of an electroslag ingot can be guaranteed, and surfaces pits and insufficient steel-slag separation are avoided.

The invention provides a multi-sectional hydrogenation dehydrogenation furnace which comprises a heating furnace, a reactor, a gas storage tank, a cooling device and a movable support, wherein the heating furnace and the reactor are horizontally placed. The reactor is a cylinder with two closed ends and formed by sequentially jointing a heating part section, a middle part section and a cooling part section, a material feeding and discharging port is formed in the end of the cooling part section and provided with a sealing cover, and a gas inflow and outflow port is formed in the sealing cover or the cylinder. The cooling device is provided with a first thermoelectric couple. The heating furnace is provided with a second thermoelectric couple. The gas storage tank is provided with a pressure gauge, a reactor joint, a vacuumizing joint and a hydrogen source joint. The reactor is installed on the movable support. The heating part section of the reactor is located in a hearth of the heating furnace. The cooling device is installed on the cooling part section of the reactor. The reactor joint on the gas storage tank is communicated with the gas inflow and outflow port of the reactor through a pipe. The invention further provides a manufacturing method of low-oxygen-content titanium powder. The oxygen content of the titanium powder manufactured through the method does not exceed 0.1wt%.

The invention belongs to the field of novel renewable energy technologies and aquaculture devices and particularly relates to an oscillating float type wave energy oxygen supply device. The oscillating float type wave energy oxygen supply device comprises an air compression pipeline, a float, vertical piles, a fixed pulley, a steel cable, a piston, an air check valve, an underwater check valve and fish culture chambers and is characterized in that the whole device is placed on a seabed foundation through the vertical piles; a sealed cabin is mounted above the vertical piles, and the air compression pipeline and the piston are mounted in the cabin; the float is distributed between two vertical piles and is connected with the piston through the steel cable and the fixed pulley; the fish culture chambers are positioned on the two sides of the device and are communicated with an oxygen supply device through the air compression pipeline. According to the design, air in the air compression pipeline can be driven to flow through the utilization of the elevation variation of the float in the wave transferring process, and oxygen is supplied to the fish culture chambers. The device has high reliability and is easy to manufacture, mount and move.

The invention discloses a hard alloy holding-up hammer dewaxing and sintering method which sequentially comprises the following steps: carrying out hydrogen dewaxing before 450 DEG C, filling argon between 450 DEG C and 600 DEG C to carry out negative-pressure dewaxing, then heating from 600 DEG C to 1250 DEG C to carry out vacuum sintering, filling argon to carry out pressure sintering from 1250 DEG C to 1415 DEG C, and carrying out vacuum sintering after the temperature is raised from 600 DEG C to 1250 DEG C; and finally preserving heat for 60 minutes, and then cooling to room temperature. The method has the advantages that the dewaxing mode that positive-pressure hydrogen dewaxing and negative-pressure argon dewaxing are matched is adopted, the dewaxing time is shortened to be within 2 days from original 5 days, argon is added into the sintering furnace in the sintering process, it is guaranteed that no gap defect exists in a product, and the product strength is improved.

The invention discloses a packaging device for reactive metal powder for 3D printing and belongs to the technical field of powder packaging. The device comprises a material collection tank, a materialtank support, a feeding ball valve, a glove box, a stainless steel pipe, an exhaust valve, a gas inlet valve and the like. The material collection tank stands upside down on the material tank support. A tank opening is connected with the feeding ball valve. The lower end of the feeding ball valve is connected with the stainless steel pipe. The stainless steel pipe communicates with the interior of the glove box. When the packaging device is used, firstly, the device is mounted, the glove box is opened, and a packaging barrel is put into the glove box; in the vacuum extraction and argon gas charging process, exhaust and inflation of the glove box are achieved through the exhaust valve and the gas inlet valve; powder feeding is conducted through the feeding ball valve (3); and finally, opening sealing is conducted through an electro-magnetic induction opening sealer (8). The packaging device has the beneficial effects that good sealing performance is achieved; and the problems that powder absorbs moisture and is oxygenated and contaminated by impurities due to manual powder feeding are avoided.