34results about How to "Avoid oxygenation" patented technology

The invention discloses a flux cored wire for heat resistant steel. Flux cored powder of the flux cored wire is formed by mixing the following components by weight percentage: 21 to 23 percent of rutile, 1.5 to 2.5 percent of aedelforsite, 19 to 21 percent of silicon-manganese alloy, 8.5 to 10.5 percent of ferrous powder, 1.5 to 2.5 percent of nickel powder, 2.5 to 3.5 percent of cryolite, 7 to 9 percent of feldspar, 13 to 14 percent of ferrochrome, 6 to 7 percent of ferromolybdenum, 6 to 7 percent of mid-carbon ferromanganese, 2.5 to 4.5 percent of magnesite, 6 to 7.5 percent of quartz, 0.5 to 2 percent of fluorite, 1.5 to 3 percent of aluminum-magnesium alloy and 0.5 to 2 percent of ferrotitanium. During the welding, the flux cored wire not only uses CO2 to protect shielded welding, but also has the advantages of small splash, easy slag removal, stable electric arc burning, and spray transfer as a droplet transfer form.

The invention belongs to the field of a novel renewable energy technology and an aquaculture device, and in particular relates to a floating type wave energy oxygen supply device utilizing a buoyancy pendulum. The floating type wave energy oxygen supply device comprises an air compression pipeline, a pendulum plate, upright columns, a fixed pulley, a steel cable, a piston, an air one-way valve, an underwater one-way valve, a rotating shaft and fish culture chambers. The floating type wave energy oxygen supply device is characterized in that the device is integrally arranged on a seabed foundation through the upright columns; a sealing cabin is mounted above the upright columns and is internally provided with the air compression pipeline and the piston; the rotating shaft and the pendulum plate are arranged between the two upright columns; the rotating shaft is fixed on the seabed; the pendulum plate is connected with the piston through the steel cable and the fixed pulley; the fish culture rooms are positioned at two sides of the device and are communicated with the oxygen supply device through the air compression pipeline. According to the floating type wave energy oxygen supply device, flowing of air in the air compression device is driven by utilizing the change of flow velocity of seawater along with wave transfer to supply oxygen to the fish culture rooms; the floating type wave energy oxygen supply device is relatively high reliability and easy to manufacture, mount and move.

The present invention relates to preparative technique for automobile air valve and parts of similar shape, specifically speaking, the present invention is a semi-continuous method for preparing TiA1-based alloy automobile air valve and parts of similar shape. The present invention adopts the method of vacuum pouring after semi-continuous induction melting in a vacuum pouring furnace: take the spongy titanium, industrial pure aluminum and other alloy elements as the raw materials and adopt a CaO formed ceramic pot for vacuum induction melting; the cast shell mold consists of part mold shell such as air valve, etc., intermediate flow trays and a vacuum pouring pipe; the intermediate flow trays are evenly distributed in the lengthwise direction of the air valve part; the technique parameters of the vacuum pouring are that the shell mold temperature is between 50 to 800 Celsius degrees and the vacuum pouring pressure difference is2.0 multiplied by 104-7.0 multiplied by 104Pa. The present invention can semi-continuously produce parts which have complicated shapes and are hard to be formed with high-melting point, high-activity Ti A1-based materials and the cost is low; in addition, the produced automobile air valve boasts of excellent internal quality and stable casting performance.

The invention relates to a technology for preparing a TiNi-based shape memory alloy sheet, in particular to a method for preparing a low-nickel binary TiNi and ternary TiNiHf shape memory alloy sheet.The technology takes titanium sponge, electrolytic nickel and a hafnium sheet as raw materials, and adopts a ceramic crucible which is formed by CaO to carry out vacuum induction melting, and the power frequency for melting is controlled to between 2,000 and 5,000 Hz and the superheat degree of an alloy liquid is controlled to between 50 and 180 DEG C under the condition of casting; static liquidforging press is adopted for modification of cast ingot tissues; forged ingots are slivered along the vertical direction from the intermediate part, and forged cracks caused by secondary hole shrinkage are completely eliminated; the forged ingots after elimination of the surface defects are forged at a temperature of between 840 and 900 DEG C; and unilateral rolling is adopted. The technology cangreatly improve the finished product rate of the low-nickel binary TiNi and ternary TiNiHf shape memory alloy sheet; and the alloy sheet prepared has superior internal quality, mechanical property and stable phase transition temperature.

The invention belongs to the field of metallurgy, and relates to a cast steel riser covering agent as well as a preparation and using method thereof. The cast steel riser covering agent comprises thefollowing components of, with the total mass units being 100 parts, 15-40 parts of aluminum electrolysis waste cathode carbon block, 10-35 parts of dolomite, 10-25 parts of vermiculite, and 20-40 parts of aluminum electrolysis waste silicon carbide-silicon nitride bricks. During preparing, firstly, crushing and grinding the dried raw materials, wherein the particle size is not more than 2 mm; weighing the raw materials according to the composition quality of the raw materials, uniformly stirring, and drying to obtain the cast steel riser covering agent. During using, a steel ladle is added into the cast steel riser covering agent to form a slag layer, so that the thickness of the slag layer is 6-8 cm, the liquid surface of the steel ladle does not leak red, and the slag layer is not crusted. By using the cast steel riser covering agent, the heat loss at the top of the riser can be solved, the solidification speed of molten steel in the riser can be prolonged, the feeding capacity of the molten steel in the riser is improved, the process yield of the casting is guaranteed, the height of the riser is reduced, the molten steel is saved, and finally the cost is reduced.

The invention relates to the technical field of tool manufacturing, in particular to a manufacturing process of a hard alloy replaceable tool. The manufacturing process of a carbide replaceable tool comprises the following steps that preparing the raw materials, adding the raw materials to the an agitating ball mill, adding anhydrous ethanol, stirring and grinding for 4 hours to obtain a slurry; drying the slurry, sieving, and then adding the fully refined paraffin and stirring well to obtain a pellet, and then the pellet after adding zinc stearate, molding, extrusion, and injection molding; placing the formed blank in a vacuum sintering integrated furnace, and introducing argon gas, followed by sintering; and sintering the blank on a lathe. After the initial processing of the tool, the quenching heat treatment is performed after the initial processing, and the blank after the quenching and heat treatment is finished on the grinding machine, and then nano WC-Co super-hard composite coating is sprayed on the surface of the tool by using the electric spark surface cladding device. The manufacturing process of the hard alloy replaceable tool has high hardness, good toughness, stable quality, is not easy to be broken, and has simple process and is suitable for industrial production.

The present invention relates to preparative technique for automobile air valve and parts of similar shape, specifically speaking, the present invention is a semi-continuous method for preparing TiA1-based alloy automobile air valve and parts of similar shape. The present invention adopts the method of vacuum pouring after semi-continuous induction melting in a vacuum pouring furnace: take the spongy titanium, industrial pure aluminum and other alloy elements as the raw materials and adopt a CaO formed ceramic pot for vacuum induction melting; the cast shell mold consists of part mold shell such as air valve, etc., intermediate flow trays and a vacuum pouring pipe; the intermediate flow trays are evenly distributed in the lengthwise direction of the air valve part; the technique parameters of the vacuum pouring are that the shell mold temperature is between 50 to 800 Celsius degrees and the vacuum pouring pressure difference is2.0 multiplied by 104-7.0 multiplied by 104Pa. The present invention can semi-continuously produce parts which have complicated shapes and are hard to be formed with high-melting point, high-activity Ti A1-based materials and the cost is low; in addition, the produced automobile air valve boasts of excellent internal quality and stable casting performance.

The invention provides a novel hard alloy with iron and nickel replacing cobalt and titanium replacing part of tungsten and a production technology of the novel hard alloy. The novel hard alloy with the iron and the nickel replacing the cobalt and the titanium replacing part of the tungsten is a hard alloy prepared from raw materials including tungsten carbide, titanium carbide, iron and nickel composite powder, cobalt powder and chromium carbide with the weight ratio being (60-80):(3-10):(10-20):1:(0.35-0.7). By means of the novel hard alloy with the iron and the nickel replacing the cobalt and the titanium replacing part of the tungsten, a novel hard alloy material with iron and nickel replacing cobalt and titanium replacing part of tungsten is adopted, the problems that the price of cobalt stays at a high level and tungsten and cobalt resources are less and less are solved, environment pollution is reduced through the production technology, and the problem of potential safety hazards is solved; and meanwhile, the pressing forming performance of the hard alloy and the quality of the hard alloy material are ensured, and a wide and long-range application prospect is achieved.

One aspect of the present invention provides a consumable electrode for pressurized electroslag remelting high-nitrogen steel, which includes a base material of the consumable electrode and at least two cored tubes embedded in the base material of the consumable electrode; the cored tube includes The iron pipe and the nitride alloy filled in the iron pipe, the first end of the cored pipe is located at the end where the consumable electrode base material is inserted into the slag pool, and the second end of the cored tube is located at the end where the consumable electrode base material is away from the slag pool one end. It avoids the leakage of nitrided alloy in the process of electroslag remelting, and improves the composition distribution from the core to the edge of the remelted steel ingot. Another aspect of the present invention provides a method for preparing a consumable electrode for pressurized electroslag remelting high-nitrogen steel, which avoids the oxygenation of molten steel caused by welding, and has a simple preparation process and low cost.

The invention discloses a flux cored wire for heat resistant steel. Flux cored powder of the flux cored wire is formed by mixing the following components by weight percentage: 21 to 23 percent of rutile, 1.5 to 2.5 percent of aedelforsite, 19 to 21 percent of silicon-manganese alloy, 8.5 to 10.5 percent of ferrous powder, 1.5 to 2.5 percent of nickel powder, 2.5 to 3.5 percent of cryolite, 7 to 9percent of feldspar, 13 to 14 percent of ferrochrome, 6 to 7 percent of ferromolybdenum, 6 to 7 percent of mid-carbon ferromanganese, 2.5 to 4.5 percent of magnesite, 6 to 7.5 percent of quartz, 0.5 to 2 percent of fluorite, 1.5 to 3 percent of aluminum-magnesium alloy and 0.5 to 2 percent of ferrotitanium. During the welding, the flux cored wire not only uses CO2 to protect shielded welding, butalso has the advantages of small splash, easy slag removal, stable electric arc burning, and spray transfer as a droplet transfer form.

A steel-bonded hard alloy, with WC as the hard phase and Fe as the binder phase, the weight percentage distribution ratio of each component in the alloy is: WC 40‑80%, Fe 15%‑55%, Cr3C2 0.5%‑ 4%, carbon black 0.1%‑0.5% and WB 0.5%‑5%. The preparation method includes batching-wet grinding-spray drying-compression molding-sintering-heat treatment and the like. The prepared cemented carbide has low porosity, excellent wear resistance, corrosion resistance, impact resistance and high strength and toughness. The bending strength can reach more than 4000N / mm2, which exceeds 10% of cemented carbide with the same binder phase content in some application fields. %‑30%. The raw materials required by the alloy of the present invention are cost-effective, and the preparation method meets the requirements of industrial mass production, which greatly expands the application scope of steel-bonded hard alloys, and can meet the wear resistance and toughness requirements of mold materials, wear-resistant parts and mining tools, etc. Both are used in high industrial fields.