465 results about "Directional solidification" patented technology

The invention relates to a purification device and a high-purity aluminum purification method using the purification device. The purification device comprises a smelting chamber shell, a smelting chamber inner cavity, a smelting container arranged at the bottom of the smelting chamber inner cavity, a magnetic field module and a directional solidification module, wherein the magnetic field module and the directional solidification module are arranged in the gap position between the smelting chamber shell and the smelting chamber inner cavity. The magnetic field module comprises a first magnetic field and a second magnetic field; the first magnetic field comprises a centrifugal magnetic field area arranged on the periphery of the side wall of an inner cavity of the smelting chamber. The second magnetic field comprises axial magnetic field areas symmetrically arranged between the top of the inner cavity of the smelting chamber and the bottom of the inner cavity of the smelting chamber; the directional solidification module comprises a cooling part arranged at the bottom of the smelting container and a heating part arranged along the peripheral side of the top of the smelting chamber shell; according to the purification device and the purification method using the purification device, the removal rate of heavy impurities is preferably as high as 85% or above, the removal rate of light impurities is preferably as high as 75% or above, and continuous production of 6N high-purity aluminum is achieved.

The invention provides a directional solidification preparation method of a degradable high-hardness zinc alloy material. The preparation method of the zinc alloy material comprises the machining processes of vacuum induction melting, vacuum directional solidification melting and the like, through the preparation method, growth of Zn + Mg2Zn11 trilobal eutectic and Zn + MgZn2 spiral eutectic is regulated and controlled, microscopic structures are arranged in the specific direction, fine and uniform structure morphology is formed, and the corrosion resistance and the mechanical property of the alloy are improved. The Zn-Mg series alloy prepared by the preparation method disclosed by the invention shows excellent microhardness (181.19 to 243.10 HV). Besides, the corrosion rate of the ideal degradable bone implant is within the range of 0.1 mm / y to 0.5 mm / y, and the corrosion rate of the degradable medical Zn-Mg alloy bone implant material is within the range of 0.0316 mm / y to 0.2280 mm / y, so that the requirement on the corrosion rate in the bone repair process is met; and after the Cu element is added on the basis of Zn-3% Mg, the microhardness of the Zn-3% Mg-Cu-Cu alloy material is improved to about 200HV, and the advantages in the aspect of mechanical support are improved.

The invention relates to a microstructure prediction method of a high-entropy alloy, a directional solidification process optimization method and a preparation method of a high-entropy alloy bar. The microstructure prediction method comprises the following steps: calculating and extracting physical property parameters of the high-entropy alloy through JMatPro software; the physical property parameters are input into parameter setting of COMSOL software, and the induction melting process of the high-entropy alloy is simulated through the COMSOL software until a completely-molten high-entropy alloy melt is obtained; the directional solidification process of the high-entropy alloy melt is simulated through ProCAST finite element software, and the microstructure of the high-entropy alloy under the corresponding technological condition is obtained. According to the method, through joint simulation of JMatPro, COMSOL and ProCAST software, prediction of the whole process from material attributes to the smelting process to the microstructure is achieved, and a more efficient and low-cost technical approach is provided for prediction, research, development and preparation of the microstructure of the high-entropy alloy.

The invention discloses bidirectional directional solidification equipment, and aims to pull a mold shell containing molten metal downwards or upwards in the same equipment, so that castings are subjected to directional solidification in opposite directions respectively. Therefore, the bidirectional directional solidification equipment comprises a directional solidification furnace, a hearth of the directional solidification furnace is divided into an upper cooling chamber, a middle heating chamber and a lower cooling chamber from top to bottom, and an upper crystallizer and a mold shell lifting mechanism are arranged in the upper cooling chamber; the mold shell lifting mechanism is used for driving an upper mold shell arranged on the upper crystallizer to descend into the middle heating chamber to be heated or to ascend into the upper cooling chamber to be directionally solidified, and a lower crystallizer and a mold shell lifting mechanism are arranged in the lower cooling chamber. The mold shell lifting mechanism is used for driving a lower mold shell arranged on the lower crystallizer to ascend into the middle heating chamber to be heated or descend into the lower cooling chamber to be directionally solidified.

The invention relates to the technical field of bio-fertilizer crushing, and discloses a dynamic stress regulation and control method of a crusher in a bio-fertilizer production process, which comprises the following steps: arranging a non-uniform gradient microgroove array arranged according to a Fibonacci sequence on a working surface of a cutter, filling a beta-glucan-based viscoelastic composite material in the microgrooves, the grain orientation of a tool matrix is regulated and controlled through an electromagnetic field-assisted directional solidification process, and a dynamic stress wave self-interference regulation and control system is constructed. Through the synergistic effect of geometric arrangement of the microgroove array and the nonlinear damping characteristic of the viscous-elastic material, the destructive interference effect of stress waves is spontaneously formed in the crushing process, and space equalization and peak suppression of dynamic stress of the working face of the cutter are achieved; the problems of stress concentration and tool fatigue of a traditional crusher in high-fiber and high-viscosity bio-fertilizer raw material processing are fundamentally solved, the crushing efficiency is remarkably improved, and the service life of equipment is remarkably prolonged.

The invention discloses a preparation method of a large single crystal guide vane, which comprises the following steps: designing a tool, pre-burying a chassis embedded part of the tool in a chassis wax mold, connecting a pouring cup embedded part with the chassis embedded part by using a connecting rod to support the whole module and ensure the strength of the module, and distributing the connecting rod on the outer side of the chassis to ensure the stability of the module. Therefore, an effective mold assembling area is a whole base plate circular area, a blade wax mold can be drawn close to the middle of the base plate when installed, the outer contour of the blade wax mold cannot exceed the whole base plate range, the whole mold assembly can be smoothly installed in a hearth, and directional pouring of the large-size single crystal blade is achieved. According to the invention, by adding a set of tooling for die assembly, the preparation of the large-size single crystal blade is realized on the premise that the existing directional solidification furnace does not need to be transformed.

GaAs IR window slabs having largest dimensions that are greater than 8 inches, and preferably greater than 12 inches, are grown using the Horizontal Gradient Freeze (HGF) method. Heat extraction is simplified by using a shallow horizontal boat that is only slightly deeper than the desired window thickness, thereby enabling growth of large slabs while also minimizing material waste and fabrication cost as compared to slicing and shaping thick plates from large, melt-grown boules. Single crystal seeds can be used to optimize the final orientation of the slabs and minimize secondary nucleation, thereby maximizing yield. A conductive doped GaAs layer can be applied to the IR window slab to provide EMI shielding. The temperature gradient during HGF can be between 1° C. / cm and 3° C. / cm, and the directional solidification can be at a rate of between 0.25 mm / h and 2.5 mm / h.

The application relates to the technical field of metal casting, and discloses a directional solidification casting equipment for low-internal-stress aluminum alloy complex structures, which comprises a heat preservation furnace, a rotary casting assembly, an infiltration temperature control assembly and a forming die. The casting equipment is provided with the rotary casting assembly and the forming die on a rotary table, the rotary table rotates at different rotating speeds to provide controllable centrifugal force, metal liquid is infiltrated and cast on the forming die in the anti-gravity mode under the action of the centrifugal force, the infiltration speed and pressure can be adjusted by changing the centrifugal force, the limitation of workpiece size in negative pressure casting is broken, and the anti-gravity casting of complex structure workpieces is facilitated, the equipment can simultaneously synchronously cast multiple molds, each process parameter is convenient to uniformly control, the quality consistency is ensured, the problem that continuous carbon fiber reinforced aluminum matrix composite materials are difficult to mass produce is solved, and the production efficiency is improved.

The invention relates to the technical field of single-crystal high-temperature alloys, in particular to a control method for dendritic crystal spacing in the growth process of a multi-layer module single-crystal high-temperature alloy. The method comprises the following steps: fixing a pre-prepared multi-layer module single crystal alloy ceramic shell with a graphite center column on a water-cooling copper disc of a liftable bracket of multi-layer module directional solidification equipment; after the mother alloy is smelted, standing is conducted, and the smelting furnace is controlled to pour alloy liquid into the multi-layer module single crystal alloy ceramic shell; and the multi-layer module single crystal alloy ceramic shell filled with the alloy liquid is pulled into the solidification cavity under the driving of the transmission device, so that directional solidification is realized, and the small-dendrite-spacing single crystal high-temperature alloy test bar is obtained. According to the method, under the condition of not changing the casting process, the problems of overlarge dendritic crystal spacing and isotherm inclination caused by the shadow effect of radiation heat dissipation in the directional solidification process of the multi-layer module single crystal high-temperature alloy are solved, and the qualified rate of large-batch production of single crystal blades is effectively increased.

The invention discloses a high-added-value silicon sludge recovery device and a method thereof. The high-added-value silicon sludge recovery device comprises a furnace body, the pretreated silicon sludge feeding system comprises a material collecting bin and a discharging pipe which is communicated with the furnace body and the material collecting bin; the smelting storage system comprises a straight-through type ceramic crucible; the electromagnetic heating system comprises a graphite heater and an induction coil sleeved outside the graphite heater; the silicon monoxide collecting system comprises a collecting barrel; the high-purity silicon drawing and collecting system comprises a graphite plug positioned at the bottom of the straight-through type ceramic crucible and a driving mechanism for driving the graphite plug to move up and down in the straight-through type ceramic crucible; and the vacuum system comprises a mechanical pump communicated with the hearth of the furnace body. According to the method, the pretreated silicon sludge is directly subjected to electromagnetic induction heating in the vacuum environment, silicon in the silicon sludge reacts with silicon oxide on the surface layer to prepare silicon monoxide, meanwhile, high-purity silicon is prepared through directional solidification of redundant silicon in the silicon sludge, and then high-added-value recovery of the silicon sludge is achieved.

The invention relates to a method for improving the high-temperature creep resistance of a TiAl alloy containing a B2 phase, which is characterized in that the microstructure of the high-niobium TiAl alloy is cooperatively regulated and controlled through phase diagram calculation, directional solidification and a heat treatment process, so that the alloy obtains a directional columnar crystal structure and a fine and dispersed B2 phase, and the high-temperature creep resistance of the TiAl alloy is enhanced. The problem that a B2 phase in an existing novel TiAl alloy is not beneficial to high-temperature creep resistance is solved.

The invention provides a nano-porous Co3Ti / Co composite electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: cleaning high-purity Co and Ti metal sheets, corroding oxides on the surfaces of Al metal sheets, then placing the Co, Ti and Al metal sheets in an electric arc furnace for melting to obtain alloy ingots, then preparing small alloy ingots through a directional solidification technology, and carrying out corrosion treatment on the alloy ingots to finally obtain the nano-porous Co3Ti / Co composite electrode. According to the electrode, a Co3Ti / Co intermetallic compound is seamlessly integrated on a Co ligament with a dual-mode pore structure (large pores are about 200nm, and small pores are about 3nm), so that the specific surface area of an electrode material is effectively increased, and the mass transfer and electron transport capabilities of an electrolyte are improved. Meanwhile, Co and Ti sites in the intermetallic compound are beneficial to adsorption of H and OH intermediates respectively, so that water dissociation and * H adsorption / desorption processes are promoted, alkaline hydrogen evolution reaction kinetics is remarkably enhanced, and an efficient electrode material is provided for hydrogen production application.

The invention relates to the field of single-crystal high-temperature alloy directional solidification casting defect prediction, in particular to a single-crystal blade freckle defect prediction method based on a large-module casting technology, which comprises the following specific steps of: establishing a 1 / 8 model of a large-module casting system by using modeling software; thermophysical parameters of the single-crystal high-temperature alloy are calculated, and the heat exchange coefficient among the casting, the mold shell and the water cooling disc in the numerical simulation process is determined in combination with related literatures; carrying out directional solidification numerical simulation, analyzing the change of the morphology of the pasty area in the solidification process, and counting the inclination angle of the pasty area of each part of the casting; establishing a Rayleigh number prediction formula, and comparing and analyzing a freckle high inclination area of a simulation result and a freckle occurrence position of an experiment result; and improving a Rayleigh number prediction formula by combining the inclination angle of the pasty area and the transverse temperature gradient value to obtain a Rayleigh number prediction result with more accurate prediction. According to the method, the position and tendency of freckles possibly appearing on the casting are predicted in advance by means of numerical simulation, and the freckle defect is avoided.

The invention relates to an aluminum-nickel-cobalt permanent magnet, a preparation method thereof and a precision part. The preparation method of the aluminum-nickel-cobalt permanent magnet comprises the following steps that raw materials are provided according to the stoichiometric ratio of the aluminum-nickel-cobalt permanent magnet, the raw materials are sequentially subjected to smelting treatment and directional solidification casting, and a casting is prepared; the casting is sequentially subjected to homogenization heat treatment, magnetic field heat treatment and tempering aging treatment, and the aluminum-nickel-cobalt permanent magnet is prepared; wherein the homogenization heat treatment is performed at the temperature of 1200-1350 DEG C in a heat preservation manner; in the step of magnetic field heat treatment, the direction of a magnetic field and the crystal orientation of the casting are in the same direction, and the crystal orientation of the casting is crystal brim in an X-ray diffraction pattern of the casting; 100 gt; and orienting. According to the method, the aluminum-nickel-cobalt permanent magnet which is relatively regular in structure, high in component uniformity and high in performance stability is obtained.

The invention relates to the field of industrial silicon melt purification, and discloses an industrial silicon melt purification method based on directional solidification and composite adsorption, which comprises the following steps: S1, multi-stage directional solidification pre-enrichment: carrying out primary directional solidification treatment on an industrial silicon melt, and controlling the solidification rate to be 0.5-5mm / min and the temperature gradient parameter, most of metal impurities in the melt are pre-enriched in a specific area; s2, dynamic targeted adsorption: in or after the primary directional solidification process, an efficient composite adsorbent is dynamically and continuously added into an impurity-rich area of the melt or the whole melt in batches, and the composite adsorbent has selective adsorption capacity for different impurities; and S3, intelligent regulation and control: constructing a full-flow adaptive intelligent dynamic regulation and control system based on digital twinning and AI algorithms. Compared with the prior art, the method has the advantages that the impurities are efficiently and stably removed, the grain structure is accurately modified, and meanwhile, the green and low-carbon production target is achieved.

The invention belongs to the technical field of ceramic materials, and particularly relates to a composite ceramic material and a preparation method and application thereof. The eutectic ceramic is prepared by taking aluminum oxide and yttrium oxide stabilized tetragonal phase zirconium oxide powder as raw materials and adopting a laser suspension zone melting directional solidification method, the drawing speed of the laser suspension zone melting directional solidification is greater than or equal to 100 mu m / s, and the laser power is greater than or equal to 300W; the eutectic ceramic is sequentially subjected to crushing, smashing and wet screening, eutectic ceramic powder is obtained, and the particle size of the eutectic ceramic powder is 20-100 microns; mixing the eutectic ceramic powder, silicon carbide whiskers and a sintering aid to obtain mixed powder; the mixed powder is subjected to hot pressing sintering, the composite ceramic material is obtained, and the hot pressing sintering temperature is smaller than or equal to 1550 DEG C. The composite ceramic material obtained by the preparation method provided by the invention has both a large size and a fine structure and has a micro-nano eutectic structure, and the mechanical properties of the material are remarkably improved.

The invention discloses a single crystal blade directional solidification process real-time closed-loop optimization method and casting equipment, and the method comprises the steps: S1, constructing a multi-physical field numerical simulation model to simulate a simulation temperature field in a directional solidification process; s2, arranging a temperature sensor at a key part of the actually poured single crystal blade to obtain an actually measured temperature field; s3, inputting the simulated temperature field and the actually measured temperature field into an extended Kalman filter to update model parameters of the multi-physical field numerical simulation model; s4, extracting solidification process characteristic parameters from the corrected multi-physical field numerical simulation model, inputting the solidification process characteristic parameters into a pre-trained machine learning model, and predicting a mixed crystal tendency probability; s5, optimizing process parameters of directional solidification by adopting a self-adaptive genetic algorithm by taking miscellaneous crystal tendency probability minimization as a target function; and S6, the optimized technological parameter set is issued to an execution mechanism, the directional solidification process is controlled to achieve closed-loop adjustment, and the steps S2 to S6 are executed circularly.