2529 results about "Ingot casting" patented technology

The invention relates to an ingot casting method for quasi-monocrystalline silicon, which comprises the following steps of: (1) laying seed crystals at the bottom of a quartz crucible and adding a silicon material and a doping agent on the seed crystals; (2) vacuumizing and heating the crucible with the materials, raising the temperature in sections to melt the silicon material on the upper part, when the seed crystals begin to melt at the later stage of melting, controlling the temperatures and heating rates of a heater and the bottom of the crucible to partially melt the seed crystals and then entering a crystal growing stage; (3) cooling the heater in sections at the stage of crystal growing to make silicon crystals grow along the direction of unmelted seed crystals, and annealing and cooling after the silicon crystals grows to obtain large-gain silicon ingots; and (4) performing subsequent treatment on the large-grain silicon ingots to obtain the quasi-monocrystalline silicon. In the method, melting and crystal growing and the like are finished in the same equipment and in the same crucible, and the seed crystals are melted by controlling the temperature of the bottom of the crucible and the heating rate of the heater, so that the method has the advantages of low cost, easy operation and suitability for mass production; and the prepared quasi-monocrystalline silicon has high conversion efficiency, and the seed crystals can be recycled.

The invention relates to bar material forging machining method of titanium alloy, particularly to a forging machining method of large-sized bar materials of TC4 (Ti-6Al-4V) titanium alloy. The forging machining method is characterized by comprising the following steps of step 1, performing cogging forging, step 2, performing intermediate forging above a phase transformation point, step 3, performing intermediate forging below the phase transformation point, step 4 and step 5, performing finished product forging and obtaining the phi 200 to 300 mm and 2000 to 3000 mm length of large-sized bar materials of the TC4 titanium alloy finally. Compared with the prior art, a large-sized ingot casting and a large-tonnage forging device are not required and the industrialized production can be achieved through an ordinary industrial 3 ton ingot and a small-tonnage forging press and the equipment investment is small, only a 3 tons of electric arc furnace and a 3000 tons of forming oil press which is matched with the electric arc furnace need to be invested in the phi 600 of 3 ton ingot, the small-tonnage forging press such as a 1600 tons of forging press needs to be invested in the forging process, and accordingly the equipment investment is significantly reduced.

The invention discloses an aluminum-silicon based aluminum section. The aluminum section is composed of, by weight, 5.0-14.0% of silicon, 0.2-0.7% of magnesium, less than 0.03% of boron, less than 0.06% of strontium, 0.1-6.55% of strengthening elements, less than 0.25% impurity elements, and the balance aluminum. The aluminum-silicon based aluminium section has the advantages of high strength, high hardness, good wear resistance, etc. the invention also discloses a preparation technology for the aluminum-silicon based aluminum section, which comprises a first step of adding aluminum-silicon alloy to a graphite crucible and heating the alloy to form melt; a second step of adding the magnesium, the silicon and the strengthening elements; a third step of adding hexachloroethane for refinement; a forth step of adding the strontium for deterioration, casting to a cast iron die to form an ingot casting; and a fifth step of hot extruding, hot rolling for deformation, solid solution treating and aging treating in sequence after annealing the ingot casting, thereby obtaining the aluminum-silicon based aluminum section. The preparation technology is simple.

The invention relates to a method of a rare earth material technic field for adding an oxide in a grain boundary or increasing an Nd-Fe-B permanent magnetic material performance by a nitride, the method comprises: (1) preparing an Nd-Fe-B ingot casting alloy by an ingot casting process or preparing an Nd-Fe-B alloy rapid hardening thin sheet by a rapid hardening thin sheet process, (2) performing rough-cracking on the alloy and grinding the alloy to powder by an air flow; (3) adding oxide or nitride powder and evenly mixing; (4) directional press-forming the mixed power in a magnetic field, isostatic cool pressing a blank after being directional press-forming; (5) putting the blank into a high vacuum fritting furnace, producing a magnet by fritting and tempering. The Nd-Fe-B permanent magnetic material has a chemical formula of NdaFe100-a-b-cBbMc, atom percents are: 12<=a<=24, 5.5<=b<=7, 0<=c<=7; M is one or more of elements Dy, Tb, Co, Ga, Al, Cu. The fritted Nd-Fe-B prepared in the invention has better magnetic performance and corrosion resistance than the magnet produced without adding the oxide or the nitride.

A multi-layer metallurgical product comprising a core aluminum alloy, purposefully tailored through chemistry and processing route to resist recrystallization during the brazing cycle to intentionally exploit the higher strengths immediately after brazing of a deformed and recovered microstructure, the core aluminum alloy being positioned on one side to an aluminum alloy interliner designed to be resistant to localized erosion, which, in turn, is adjacent to a 4xxx cladding alloy. The multi-layer product can be fabricated at least in part via any multi-alloy ingot casting processes such as the Simultaneous Multi-Alloy Casting process or the Unidirectional Solidification of Castings process.

The invention provides a preparation method of a polycrystalline silicon ingot. The preparation method comprises the following steps that a core source is arranged at the bottom of a crucible, and a core source layer is formed; silicon materials in a molten state are arranged on the core source layer; and the temperature in the crucible is controlled to gradually rise in a direction vertical to the upward direction form the bottom of the crucible, the temperature gradient is formed, the silicon materials in the molten state form core crystallization by utilizing the core source, and the polycrystalline silicon ingot is prepared. The invention also provides high-quality polycrystalline silicon ingot obtained by the preparation method, a polycrystalline silicon slice obtained through the preparation of the polycrystalline silicon ingot and the crucible for polycrystalline silicon ingot casting. The polycrystalline silicon ingot prepared by the preparation method has the advantages that the crystalline size is uniform and regular, the dislocation density is low, and in addition, no obvious pine-tree crystals or twin crystals exist.

The invention discloses a flat die forging high slenderness ratio ultralimit upsetting method and a flat die forging high slenderness ratio ultralimit upsetting anvil. The upsetting method comprises the following steps: positioning an upper concave anvil and a lower concave anvil, and guaranteeing superposition of a central line of the upper concave anvil and a central line of the lower concave anvil; suspending circular cast ingots of which the slenderness ratio is more than 3 on the lower concave anvil, and adjusting the position to guarantee superposition of central lines of the aluminum alloy circular cast ingots, the central line of the upper concave anvil and the central line of the lower concave anvil; and allowing a power mechanism to drive the upper concave anvil to move down after the adjustment is over, and slowly applying pressure on the aluminum alloy circular cast ingots, so that the aluminum alloy circular cast ingots are stably upset and do not have the defects of bending, folding and the like. The invention breaks through impassable rules of aluminum alloy upsetting in the recent hundred years, and makes the slenderness ratio of the aluminum alloy circular cast ingots be more than 3 and reach 3.3 (phi 820*2,700mm), namely the length of the circular cast ingots increases 240 mm and the weight of the circular cast ingots increases 360 kg after the length of phi 820 mm circular cast ingots increases from 2,460 mm to 2,700 mm, so that the invention provides enough metal margin and creates a loose environment for development of aluminum alloy annular forged pieces.

The invention discloses a treatment method for vitrifying arsenic-alkali residue, aiming at solving the problem of pollution or potential menace of the existing arsenic-alkali residue treatment process on environment. The treatment method for vitrifying the arsenic-alkali residue comprises the following steps of: selectively reducing sodium antimonate in the arsenic-alkali residue to metallic antimony by a carbon reducing agent in a molten state and keeping arsenic in the residue in the form of sodium arsenate; and then adding a glass molten solvent in the arsenic-containing residue to form a low-temperature glass phase, discharging the glass phase, and then carrying out water-quenching on the glass phase into broken glass pieces or directly casting the glass phase into a glass ingot in an ingot casting mould, thus facilitating piling up or returning to a pit and land-filling. According to the invention, the recovery rate of antimony in the arsenic-alkali residue is greater than 95%, and the content of arsenic in the metallic antimony is less than 3%; and the arsenic-containing glass pieces belong to general solid wastes and can be directly piled up in the open air or land-filled.

The invention discloses cold work roll steel for high-strength steel rolling, a cold work roll and its manufacturing method. The material of cold work roll is composed of the following chemical components of: by weight, 0.6-0.8% of C; 0.6-1.5% of Si; 0.6-1.5% of Mn; 4.0-6.0% of Cr; 0.5-2.0% of Mo; 0.5-1.0% of V; P being less than or equal to 0.020%; S being less than or equal to 0.015%; and the balance being Fe and unavoidable impurities. The manufacturing process comprises steps of: electric furnace smelting; secondary refining; vacuum degasification; electric bar casting; electroslag refining; ingot casting; forging; preheat treatment; rough machining; quenching and tempering treatment; semi-finish machining; final heat treatment; finish machining; and finished product. According to thenovel cold work roll provided by the invention, the ratio of the alloy elements is optimized based on 5% of Cr. By the adoption of a short-time high-temperature solid solution quenched-tempered heat treatment technology, the roll strength and wear resistance of the cold work roll are improved, thus satisfying production requirements of high-strength cold rolled strips.

The invention provides a method and a device used for purifying and ingot-casting of multi-temperature area silicon material; the silicon material is added into a crucible after a fluxing medium is added; the silicon material is inductively heated, fused and vacuum-smelted; furthermore, oxidative gas is added to carry out the reaction; subsequently, temperature reducing and directional solidification are carried out to the silicon material to form silicon ingots by crystallization. The device comprises a crucible system, a lifting device, an induction heater and a resistance heater; the induction heater is arranged on the upper surface of the resistance heater so as to respectively form an induction heating area and a resistance heating area; the lifting device is arranged on the lower surface of the resistance heating area and can move up and down in the induction heating area and the resistance heating area; and the crucible system is arranged on the lifting device. The method and the device can be used for purifying and ingot-casting the silicon ingot with high purity and high purification efficiency, can complete the whole process in one furnace body and can save the time and energy resource.

The invention provides a figuration technology of superfine magnesium alloy thin-walled tube for degradable vascular bracket. The characteristics of its major technique is adding yttrium to pure magnesium, mixing RE, Al, Ca, Mn, Sb, Zn, and Zr, smelting through gas shield smelting + reduction iron solvent refining method to obtain ingot casting of magnesium alloy, performing hot extrusion, distortion and solution treatment, intercepting certain length as workpiece for subsequent processing, processing one end to tubular form and the other end to clubbed form, heating the pipe end, and tugging through multiple tracks to obtain superfine thin-walled tube with diameter of 2-10mm, wall thickness of 0.20-1mm.Its advantage is overcoming limitation of figuration technology such as pressing, has low cost, uniform wall thickness and tissue, and good mechanical property.

The invention discloses a method for recovering silicon material from waste materials in cutting crystalline silicon by a diamond wire. The method is characterized by comprising the following steps of: feeding the collected waste materials to a centrifugal machine to centrifuge and settle, thus obtaining silicon material sediment; carrying out solid-phase rinsing on the silicon material sediment to remove organic matter type impurities and part of diamond powder from residual liquid in solid, thus obtaining silicon powder with certain purity; pickling the solid-phase silicon powder with hydrochloric acid to remove metal impurities; after rinsing the silicon powder subjected to hydrochloric acid pickling with pure water, rinsing the silicon powder with hydrofluoric acid to remove oxide from the surface of the silicon powder; carrying out ultrasonic rinsing and drying on the silicon material rinsed with hydrofluoric acid; carrying out directional solidification, ingot casting and purification on the dried silicon material, thus obtaining a solar grade silicon material; and at last, carrying out packaging after smashing, pickling, rinsing and drying the silicon material. The method is simple and convenient, the equipment cost is low, the operation is easy to control, the treatment recovery rate is high and the overall recovery rate can achieve over 99.99%.

It is a method for preparation and the special device of nanocrystalline ingotting from metallic fondant treated jointly by magnetic field and supersonic wave, solving the present technique problem of complex device, high cost, and difficulty to prepare large-scale nanometer material and so on. The invented method is as the following steps: melting and heating the matched raw material, deairing the metallic fuse-elements, pouring rapidly the deaired metallic fuse-elements into preheated crucible, heating upwards the liquidus curve, applying electromagnetic mixing and ultrasonic vibration, chilling until it freezes totally, then the block-shaped nanocrystalline ingotting being prepared; the special device that applied joint treatment of electromagnetic mixing and ultrasonic vibration having a holding furnace, which is equipped with a crucible, the special being characterized in that outboard of the holding furnace is equipped with magnetic field generator, over the crucible there is a ultrasonic transducer, and bottom of the crucible is equipped with a chiller.

The invention discloses a method for preparing semi-solid state slurry through intensive cooling stirring. The method comprises the following steps: placing overheated alloy melt in a crucible or a casting ladle, descending a rotary stirring shaft internally introduced with a circular cooling medium in the alloy melt through a lifting device, driving the convection heat exchange of the alloy melt through stirring, continuously cooling the rotary stirring shaft through the circular cooling medium, stirring for a fixed period of time or cooling the melt to a set temperature, raising the rotary stirring shaft to prepare the semi-solid state slurry and form an ingot casting; closing the casting ladle containing the semi-solid state slurry to formation equipment and pouring the semi-solid state slurry into a cavity or material chamber of the formation equipment to take the shape; and taking out a formed part and moving the crucible or the casting ladle back to an original position and filling the overheated alloy melt to perform the next semi-solid state slurry preparation. The invention further provides a device for realizing the above method. Through the adoption of the method and device provided by the invention, large volume of semi-solid state slurry can be prepared once, and the semi-solid state slurry can be continuously produced in batch, and then the rheolytic formed part can be prepared through the combination of pressure casting, rolling, die-forging and other conventional formation equipment.

High strength aluminum alloys based on the Al—Zn—Mg—Cu alloy system preferably include high levels of zinc and copper to provide increased tensile strength without sacrificing toughness. In addition, small amounts of scandium are also preferably employed to prevent recrystalization. Preferred ranges of the elements include by weight, 8.5-11.0% Zn, 1.8-2.4% Mg, 1.8-2.6% Cu, 0.05-0.30% Sc and at least one element from the group Zr, V, or Hf not exceeding about 0.5%, the balance substantially aluminum and incidental impurities. During formation of the alloys, a homogenization process is preferably employed after alloy ingot casting in which a slow rate of temperature increase is employed as the alloy is heated as near as possible to its melting temperature. For the last 20-30 F below the melting temperature, the rate of increase is limited to 20 F/hr. or less to minimize the amount of low melting point eutectic phases and thereby further enhance fracture toughness of the alloy.

The invention provides a method for preparing a high-performance Cu-Fe deformation in-situ composite material by magnetic field treatment, which is characterized in that the Cu-Fe deformation in-situ composite material in the method is finally prepared into a formed copper material through technical process flows of material proportioning, smelting, casting or continuous casting, magnetic field control solidification, hot forging or hot milling, solid solution treatment, cold milling, cold pulling and magnetic field ageing control. The magnetic field is exerted in the ingot casting solidification process, the solidification of the Cu-Fe deformation in-situ composite material is controlled, Fe dendritic crystals carry out extremely obvious thinning, and the Fe aliquation is reduced, so the material disperses and distributes the uniform and fine Fe fiber phase in a base body after the subsequent cold deformation processing, and the intensity of the material is greatly improved. The magnetic field is exerted in the ageing process treatment process for promoting the Fe separation, increasing the separation amount of Fe particles, reducing the separation phase dimension and promoting the separation phase dispersion distribution, so the conductivity of the material is greatly improved, and the intensity of the material is further improved. The preparation process is simple, and the cost is low. The invention is applicable to the preparation of the high-performance Cu-Fe deformation in-situ composite material or other similar materials.

The invention relates to an aluminum alloy refining gent, the aluminum alloy refining agent is characterized by comprising the following components by mass percent: 35-50% of KCl, 30-40% of NaCl, 5-8% of CaF2, 8-15% of Na3AlF6, 5-10% of Mg2N3, 3-6% of C2Cl6 and 0.2-0.5% of rare earth. The aluminum alloy refining agent is good in cleaning effect, strong in degassing capacity, and especially capable of removing aluminum oxide impurity with slight size, reducing the metal loss, and improving the microstructure of a round ingot casting after the aluminum alloy is molten.

A multipurpose vacuum casting device comprises a smelting furnace and a set of vacuum pumping system communicated with an inner cavity of the smelting furnace. The smelting furnace is provided with a casting pull-down continuous casting molding system which is formed together with the smelting furnace, a vacuum smelting system used for melting metal and a vacuum casting system used for ingot casting molding. Due to adoption of only one set of vacuum pumping system and one smelting furnace, a plurality of purposes such as vacuum induction heating smelting, vacuum casting, vacuum smelting and continuous casting under protection of inert gas can be achieved, the number of device components is greatly reduced, structure of a device is simplified, manufacture cost of the device is decreased to a large extent, production efficiency and casted blank quality are improved, operation is convenient and failure rate of the device is reduced.

The invention provides a bonding and splicing method of seed crystals for monocrystal silicon-like cast ingots. According to the method, an inorganic bonder is adopted for bonding and splicing adjacent seed crystals together to form a seed crystal layer, wherein the inorganic bonder is filled into splicing seams of the seed crystals in the seed crystal layer. When the seed crystal layer is applied to the monocrystal silicon-like cast ingots, defects such as polycrystal and dislocation at seed crystal splicing seams in the ingot casting process can be effectively avoided, the monocrystal silicon-like cast ingots with small defects and high conversion efficiency can be obtained, and the ratio that full-monocrystalline silicon pieces are obtained is greatly improved. The invention further provides a crucible for casting ingots with seed crystal layers. The crucible is applicable to on-scale production of high-quality monocrystal silicon.

The invention provides a corrosion resisting coating for a polycrystalline silicon ingot casting furnace, which is characterized by comprising an alloy anticorrosive coating coated on the surface of a carbon fiber thermal-protective coating and a thermal-insulating anticorrosive coating coated on the surface of the alloy anticorrosive coating, wherein the alloy anticorrosive coating comprises 20 to 38 weight percent of aluminum powder, 30 to 45 weight percent of zinc powder and 30 to 45 weight percent of zirconium powder; the thermal-insulating anticorrosive coating comprises 55 to 72 weight percent of graphene powder, 25 to 40 weight percent of La2Ti2O7 powder, 1 to 5 weight percent of forming agent and 1 to 5 weight percent of mixture of a curing agent and a dispersing agent. The invention also provides a high-temperature resistant protective coating for the polycrystalline silicon ingot casting furnace and a preparation method thereof. The coating of the invention is high in hardness and corrosion resistance, so the service life of a carbon fiber thermal-protective coating is prolonged.