42 results about "Recovery" patented technology

The EBSD characterization method comprises the following steps: S1, determining the size of a to-be-analyzed sample, and pretreating the surface of the to-be-analyzed sample; s2, placing the sample to be analyzed under a scanning electron microscope for observation, and selecting an area to be measured; s3, calibrating crystal orientation information by using an electron back scattering diffraction (EBSD) instrument; s4, analyzing and calibrating in Channel5 processing software to obtain an IPF graph, and analyzing the grain size; s5, recrystallization, recovery and non-recrystallization are distinguished according to the in-grain orientation difference distribution parameter GOS, a distribution diagram is formed, and the average grain size and the shape factor are calculated. According to the method, the recrystallization degree is represented according to the orientation difference distribution parameter GOS in the crystal grains, the recrystallization, recovery and non-recrystallization crystal integral numbers are given, and the average crystal grain size, the shape factor and the distribution characteristics of the average crystal grain size and the shape factor can be calculated.

The invention discloses a preparation method of a heterostructure high-performance metastable beta titanium alloy capable of inducing a deformation mechanism in a multilevel and sequential mode, and belongs to the technical field of metal materials. The method comprises the following steps: firstly, carrying out hot rolling in a beta single-phase region to prepare a blank and crushing coarse grains; substructures such as twin crystals and martensite are introduced through cold rolling; and through short-time annealing in a beta single-phase region, a multi-stage heterogeneous lamellar structure composed of thick equiaxed crystal grains, deformation recovery crystal grains and fine recrystallized crystal grains in an alternating manner is successfully constructed. The characteristic that twin crystals and martensite induce different stresses under different grain sizes is utilized, during deformation, thick equiaxed grains firstly start a deformation mechanism, and then fine recrystallized grains are activated; and in the later period of plastic deformation, the interior of the primary deformation strip further triggers a secondary deformation mechanism. The unique behavior of'grading-time sequence 'activation of a multi-deformation mechanism along with the increase of the dependent variable enables the metastable beta titanium alloy to keep excellent plasticity, and meanwhile, the work hardening rate is remarkably improved.

The invention discloses a method and device for preparing a mixed crystal structure material through friction stir solid-phase deposition, and belongs to the technical field of heterostructure material preparation. According to the method, firstly, a deposition head is used for carrying out single-layer friction stir solid-phase deposition on a needed material, then a special corrugated roller is used for carrying out cold rolling to enable different positions of the surface of the deposition material to be subjected to different degrees of cold deformation, and therefore uneven high dislocation density is introduced into a deposition layer, and then next-layer friction stir solid-phase deposition is carried out on the surface of the deposition layer. In the friction-stir solid-phase deposition process, static recrystallization and static recovery rapidly occur in a local high-dislocation-density area to maintain fine grains, and grain growth rapidly occurs in a low-dislocation-density area due to heating, so that the whole deposition layer shows the mixed crystal structure characteristic that fine grains and coarse grains coexist; the block mixed crystal structure material can be prepared through stirring friction solid phase deposition and cold rolling circulation.

The process (1) for the recovery of raw material from waste products comprises at least the phases of: supply (A) of one skein to be treated (3) composed of a harmonic steel fraction and a non-ferrous fraction; pre-treatment (F) of the skein to be treated (3) to separate the harmonic steel fraction from the non-ferrous fraction to obtain one treated skein (3b), comprising one step of mechanical separation (F1) of the harmonic steel fraction from the non-ferrous fraction; heat treatment (B) of the pre-treated skein (3a) to obtain one treated skein (3b), the phase of heat treatment (B) comprising a step of inductive exposure (B1) of the pre-treated skein (3a) to one time-varying magnetic field, the step of inductive exposure (B1) being adapted to raise the temperature of the pre-treated skein (3a) to one working temperature below 800° C.; post-treatment (E) of the treated skein (3b).

This invention provides a method for producing 270MPa grade hot-dip galvanized deep-drawing steel strip. The method controls the chemical composition, the hot rolling process (including soaking temperature, final rolling temperature, and coiling temperature), and the hot-dip galvanizing process (including annealing temperature, galvanizing temperature, finishing, and tension leveling). This results in hot-dip galvanized steel strip with excellent mechanical properties (Rp0.2 = 185–255 MPa, Rm ≥ 270 MPa, A50mm ≥ 42%, n90 ≥ 0.17). It effectively overcomes the problems of mixed crystals and performance deterioration in the pickling-hot-dip galvanizing technology during annealing due to lack of deformation recovery, recrystallization, and grain growth. The product's microstructure is 100% ferrite with a ferrite grain size of 8.0–10.5. Furthermore, the pickling-direct hot-dip galvanizing process used in this invention omits the conventional cold rolling step, reducing process costs.

The invention discloses a method for establishing a thermal deformation constitutive model suitable for austenite and a dynamic transformation interval, belongs to the field of a metal material plastic forming process, and solves the problem that an existing general model is difficult to accurately predict a thermal deformation stress-strain relationship between complete austenite and the dynamic transformation interval at the same time. According to the method, work hardening, dynamic recovery and dynamic recrystallization effects of austenite, dynamic precipitation of the austenite to ferrite under strain induction, work hardening and dynamic recovery effects of the ferrite and a strain distribution behavior between the austenite and the ferrite are considered; and parallel prediction of microstructure and macroscopic rheological behavior in the single-pass thermal deformation process of the steel material in a wide temperature range is realized, and the method accords with the actual engineering processing condition.

The application provides a superfine nanocrystalline silver alloy and a preparation method thereof, and belongs to the technical field of superfine crystal preparation.The superfine nanocrystalline silver alloy is prepared by the following steps: firstly, rolling the silver alloy; secondly, breaking the original grains in the silver alloy by rolling; thirdly, transforming the broken grains into equiaxed grains by annealing; fourthly, cross-extruding under ultralow temperature to inhibit recovery recrystallization; fifthly, breaking the equiaxed grains into superfine equiaxed grains by cross-extruding; sixthly, further refining the grains by ultralow-temperature rolling; and finally, recrystallizing the broken grains by annealing after rolling, so that the superfine nanocrystalline silver alloy with nanometer grain size is obtained; the superfine nanocrystalline silver alloy has uniform microstructure, obvious strength improvement, good conductivity and ductility, and the preparation method is simple, easy to popularize in large scale, and has wide application prospect in industry.

The present invention provides a method for improving the strength and radial uniformity of inertia friction welding joints of high-temperature alloys, and belongs to the field of solid phase welding technology. The present invention uses inertia friction welding technology to perform high-quality connection of rotating workpieces of high-temperature alloys. Due to the uneven distribution of heat generation and pressure at the joint interface, the growth of recrystallized grains is affected, resulting in uneven distribution of radial structure and performance of the joint, which in turn induces the formation of a weak performance zone in the joint, resulting in uncoordinated deformation of the joint, which significantly affects the strength of the joint. The present invention improves the strength of the joint and significantly improves the uniformity of the radial structure and performance of the joint through the synergistic effect of solid solution strengthening and two-stage aging strengthening, promotes the dynamic recovery and dynamic recrystallization process of the joint, improves the structure morphology and distribution of the joint strengthening phase γ′, reduces the precipitation phases such as carbides, and realizes precise regulation of the joint structure and performance.

The application provides a method for additive manufacturing composite friction stir processing ordered construction of ultra-fine grain network structure, which is characterized by the following steps: through synchronous friction stir processing in electric arc wire additive manufacturing, strong plastic deformation of the friction stir processing is utilized to cause mechanical crushing of the deposited state organization, and a cross friction stir processing mode is combined to obtain an ultra-fine grain network structure; a repeated deposition process causes the organization which has been subjected to strong plastic deformation to undergo recovery recrystallization and grain growth, different span friction stir processing is utilized to cause ordered construction of the deposited state organization grain gradient, and finally, the construction of the component material of the ultra-fine grain three-dimensional network structure is realized.

Provided are a shape memory steel sheet having a sufficient shape recovery strain amount, and a method for manufacturing the same. This shape memory steel sheet contains, in terms of mass%, 0.30-1.50% of C and 15.0-35.0% of Ni, and is such that the compositions of Si, Mn, P, S, Al, N, O, and the like are adjusted, wherein: the metal structure before a sub-zero treatment has an austenite content of 80% or greater and a graphite content of 15% or less in area ratio at a position of 1 / 4 of the sheet thickness; a part of the austenite is transformed into martensite by the sub-zero treatment; the martensite contains {112} twin crystals therein; the {112} twin crystals have a width of 50 nm or less; and the martensite is such that the value obtained by dividing the c-axis length of the crystal lattice (bct: body-centered square lattice) by the a-axis length thereof is greater than 1.00, the sub-zero treatment being a treatment in which the steel sheet is held in liquid nitrogen for 2 hours.

The invention discloses a forging forming method of a large long shaft type variable cross-section forge piece, the method comprises the steps of blanking, overall drawing-out, intermediate shaft radial forging, transition part forging and the like, in the overall drawing-out process, high-frequency and low-frequency alternate forging is adopted, so that carbides can be effectively crushed, the comprehensive performance of metal materials is improved, and the yield of the large long shaft type variable cross-section forge piece is improved. The crystal mixing phenomenon is eliminated, and the forging quality is improved. And the final heating number deformation is larger than 30%, and a forge piece with fine and uniform grains can be obtained. And the final forging temperature is controlled to be not lower than the recrystallization temperature of the metal material, so that the recovery and recrystallization processes of crystal grains can be completed completely, the crystal grains are further refined, and the performance of the forge piece is improved. The method is suitable for forging forming of large long shaft type variable cross-section forgings.

The invention discloses a multidirectional forging forming method for a titanium alloy irregular die forging, which is characterized in that the titanium alloy irregular die forging is formed by adopting a multidirectional forging device, so that the forging is deformed in the vertical direction and the horizontal direction at the same time, metal materials are ensured to fully flow towards multiple directions, and the interiors of crystal grains are mutually staggered and crushed; and recovery recrystallization can be fully carried out, so that the aims of refining crystal grains and improving the structure property are achieved. The method is suitable for multidirectional forging forming of the titanium alloy irregular die forging.

The invention discloses a method for recovering non-uniformly embedded high-silicon specularite and hematite. The method comprises the following steps: classifying ores into large grains (+ 2-3mm), coarse grains (+ 0.5-2mm), medium grains (+ 0.074-0.5 mm) and fine grains (-0.074 mm) through dry vibrating screening; grinding large grains, combining with coarse grains, sorting by a coarse sand shaking table, and sorting medium grains by a fine sand shaking table to obtain primary concentrate and middlings; the middlings and the fine particles are subjected to reduction roasting to be converted into magnetite under the conditions that the adding amount of the carbon powder is 15-20% and the temperature is 1000-1250 DEG C, and secondary concentrate is recovered through 1600-1900Oe magnetic separation after ore grinding; and combining double concentrates, and carrying out reverse flotation desilicication to obtain a final product. The method solves the problems of uneven dissemination and high silicon restriction of the hematite, the iron recovery rate reaches 87.5-90.1%, the concentrate grade is 64.2-68.8%, the silicon dioxide content is reduced to 7.3-9.5%, the cost of per ton of ore is remarkably reduced, and the method is suitable for resource utilization of the sedimentary metamorphic refractory iron ore.

The embodiment of the invention provides a nickel-titanium alloy orthodontic arch wire and a preparation method thereof. Arch wire raw materials are subjected to resistance furnace annealing treatment, surface cracks are reduced, an oxidation film is formed, crystal grains are recrystallized, the surface smoothness degree is improved, the grain direction of the surface of the arch wire can be consistent through multiple times of drawing, and small initial cracks and burrs are generated; through constant-temperature shaping, the surface smoothness is improved, nicks and pits are reduced, the opening degree of the arch wire is guaranteed, the comfort degree of wearing the arch wire in the oral cavity of a human body is improved, certain corrosion resistance and resistance are achieved, it can be guaranteed that the arch wire is not prone to deformation and damage in the oral cavity constant-temperature environment, and the service life of the product is prolonged. In addition, the finished nickel-titanium alloy arch wire has superelasticity, the self-recovery capability after teeth move can be met, and damage to periodontal tissue is reduced.

This invention relates to the fields of materials science and metal processing technology and discloses a method for determining the critical point of dynamic recrystallization of mixed-crystal materials. This method, based on the assumption that peak stress represents the saturated stress value of dynamic recovery, uses precise fitting of true stress-true strain curves to reduce noise, plots the relationship between work hardening rate and true stress, and utilizes the Tangent plug-in in Origin software to precisely locate the critical point of dynamic recrystallization. The critical stress and strain values ​​corresponding to the critical point are recorded, providing key process parameters for material processing and significantly improving the systematicity and practicality of the entire process.

The invention provides a multi-crushing and less-grinding beneficiation method for low-grade iron ore with uneven crystal particle size and thickness distribution, and relates to the technical field of mineral engineering, the method comprises the following steps: S1, preparing materials; s2, a high-pressure rolling process; s3, an ore grinding and grading process; s4, a second-stage magnetic separation process; s5, performing an independent screening process; s6, a fine selection three-section elutriation machine process; s7, performing a second-stage grading process; s8, a moxa sand grinding and regrinding process; s9, a fine selection four-section elutriation machine process; and S10, performing a three-stage magnetic separation process. Aiming at the low-grade magnetic iron ore with non-uniform crystal granularity distribution, the method realizes coarse and fine grading recovery, can treat the low-grade ore, reduces the ore grinding cost, improves the treatment capacity of a mill, is more environment-friendly in the enrichment process, improves the iron monomer dissociation degree, provides high-quality raw materials for fine selection, ensures the purity of concentrate and the uniform ore grinding granularity, and improves the ore quality. The whole technological process is simple and efficient, industrial production is easy, and the treatment efficiency and the product quality are remarkably improved.

The invention discloses a beneficiation process for improving the magnetic iron recovery rate of wide-fraction tailings, and belongs to the technical field of beneficiation. The magnetic iron grade of tailings can be effectively reduced, and the magnetic iron recovery rate is increased; the problems that in the prior art, iron tailings are low in concentration, wide in particle size distribution range and difficult to recycle, and resource waste is caused are solved. According to the invention, the magnetic separation operation is carried out on the fine-grain tailings after wet-type pre-separation and classification and the micro-fine-grain tailings generated by stage grinding separation and elutriation and concentration, and the advantages of good coarse-grain recovery effect of the disc magnetic separator, high magnetic field intensity, large gradient and good fine-grain recovery effect of the cage magnetic separator are utilized; the technical effect of improving the magnetic iron recovery rate of the wide-fraction tailings is achieved, the effects of resource recovery and comprehensive utilization and compliance and yield increase are achieved, meanwhile, the whole improvement cannot cause waste of existing equipment, the improvement cost is relatively low, and the method is suitable for large-scale production.

The invention provides a plastic deformation parameter optimization method of an Ag / MAX electric contact material. A true stress-true strain curve of the Ag / MAX composite material at different deformation temperatures and deformation rates is obtained through a Gleeble thermal simulation compression test, and the deformation process of the material is simulated. By establishing a work hardening curve, judging a softening mechanism of the material and drawing a three-dimensional hot working diagram of the material, for example, a dynamic recovery region can obtain higher conductivity and arc erosion resistance, and a dynamic recrystallization region can obtain higher strength and plasticity, so that the most suitable processing region is selected according to specific use requirements and application environments, and the processing efficiency of the material is improved. The material performance is regulated and controlled. According to the method, guidance can be provided for the plastic deformation process of the Ag / MAX electric contact material, the research and development period is greatly shortened, and the precious metal Ag resource is saved.

The present invention relates to the technical field of light-emitting diodes, and specifically to a high-quality LED epitaxial structure and a preparation method thereof. Through the design of a new nucleation layer, a low-density, high-quality crystal nucleus can be formed, and the density of the grains formed in the subsequent high-pressure roughening layer will be lower, and the size of the grains will be relatively large. The time for subsequent healing between grains will be longer, and the dislocation density at the grain healing boundary will be reduced. In the initial stage of 3D oscillation, the addition of Al can inhibit the growth of GaN on the non-C surface of PSS to a certain extent and improve the lattice quality; in the nucleation layer and roughening layer stages, it tends to a 3D growth mode, reducing the V / III ratio and increasing the pressure, which is conducive to the growth of crystal nuclei and grains, reducing the density of crystal nuclei, and reducing the dislocation density at the interface healing. In the recovery layer growth stage, it tends to a 2D / 3D mixed growth mode, increasing the temperature, increasing the V / III ratio and reducing the pressure are conducive to the healing of the grains, so that the lateral growth rate is greater than the vertical growth rate.

The invention discloses a low-power-consumption variable-frequency starting PTC (Positive Temperature Coefficient) thermistor and a preparation method thereof, and belongs to the technical field of PTC thermistors. The resistor comprises a PTC ceramic base material, a glass phase material, a semiconducting agent and a manganese additive, wherein the high-temperature-resistant ceramic material comprises the following raw materials in percentage by mass: 48%-62% of BaCO3, 22%-38% of TiO2, 0.5%-1.2% of SrCO3, 4%-8% of CaCO3, 4%-8% of PbO, 0.3%-0.6% of a glass phase material, 0.25%-0.45% of a semiconducting agent and 0.3%-0.6% of Mn (NO3) 2. Through the synergistic effect of component regulation, dual coating modification and segmented atmosphere sintering, a grain boundary structure and a potential barrier are effectively regulated, the contradiction between size reduction and reliability, between Curie temperature reduction and recovery time, and between chip temperature rise and thermal shock resistance is solved, and high reliability and excellent performance of a product under low power consumption are achieved.

The invention relates to a metal sheet blanking surface quality control method which comprises the following steps: applying micro-plastic excitation to a metal sheet before blanking to obtain an instantaneous recovery parameter of a material under low-energy deformation so as to judge a shear response state of the metal sheet; judging the deformation stability of the material in the current stress field according to the shear response state, and classifying the characteristics as shear offset or strain concentration characteristics; aiming at a shearing offset type material, a sliding shear path of low-speed feeding and gap reduction is adopted; aiming at a strain concentration type material, adopting a splitting path of high-speed rushing-in and strengthening front angle fracture; monitoring derivative changes of blanking force and a displacement curve in the blanking process, identifying a fracture critical stage, dynamically adjusting the feeding speed of a punch, and regulating and controlling the fracture morphology through acceleration or deceleration; and the edge springback behavior of the punch in the return stroke stage is detected at the blanking tail end, if a warping trend exists, the tail end calendaring correction action is activated, and secondary shaping of the edge area is achieved by combining an obtuse-angle pressing head or a conical structure of the punch with material springback kinetic energy.

The utility model relates to the technical field of circuit board processing, in particular to a copper sulfate recovery system which comprises a micro-etching liquid tank, a crystallization tank and a plate heat exchanger, the micro-etching liquid tank and the crystallization tank are connected with the plate heat exchanger through a continuous input type circulation assembly, and a transverse strip block is fixedly installed on the outer wall of the top side of the crystallization tank. A limiting mounting groove is formed in the transverse strip block, a reciprocating type driving assembly is mounted in the limiting mounting groove, a conveying scraper is mounted on the reciprocating type driving assembly, a stirring part is rotatably mounted at the top of the conveying scraper, a driving gear is fixedly mounted at the top of the stirring part, and the driving gear is in meshed connection with a positioning rack fixed at the top of the crystallization tank; while scraping and conveying of copper sulfate crystals are achieved, the stirring part can be made to rotate, a large number of nuclei are promoted to aggregate and grow, crystallization of the copper sulfate crystals is better facilitated, and meanwhile the situation that the solubility of copper sulfate is increased and the recovery effect of the copper sulfate crystals is affected due to the fact that the temperature of micro-etching liquid is too high can be avoided.

The invention discloses a core-shell flaky WSe2 / S3Se5 coated PANI composite material, which is obtained by compounding WSe2 / S3Se5 with a flaky structure and PANI nanofibers, the WSe2 / S3Se5 is flaky, the size is 3-5 microns, and the WSe2 / S3Se5 is obtained by vulcanizing WSe2; the PANI nanofibers are uniformly coated on the surface of the WSe2 / S3Se5, and after being coated with PANI, the WSe2 / S3Se5 is still kept in a sheet structure with the size of 3-5 microns. The preparation method comprises the following steps: 1, preparing WSe2 / S3Se5; and 2, coating the PANI. According to the sensor based on WSe2 / S3Se5-coated PANI, the NH3 response rate ranges from 500% to 600%, the response time ranges from 440 s to 450 s, the recovery time ranges from 480 s to 490 s, and the lower detection limit ranges from 180 ppb to 190 ppb. The catalyst has selectivity to NH3, and the response rate of NH3 is 550-560%; the moisture resistance is realized; and the response rate of NH3 can be up to 800-900%.

The invention discloses a radial forging forming method of a variable cross-section long shaft type forging.The method comprises the steps of blanking, overall drawing-out, intermediate shaft radial forging, transition part forging and the like, in the overall drawing-out process, high-frequency and low-frequency alternate forging is adopted, carbides can be effectively broken, the comprehensive performance of metal materials is improved, and the yield is improved. The crystal mixing phenomenon is eliminated, and the forging quality is improved. And the final heating number deformation is larger than 30%, and a forge piece with fine and uniform grains can be obtained. And the final forging temperature is controlled to be not lower than the recrystallization temperature of the metal material, so that the recovery and recrystallization processes of crystal grains can be completed completely, the crystal grains are further refined, and the performance of the forge piece is improved. The method is suitable for forging forming of the variable-cross-section long-shaft type forgings.

The invention relates to the technical field of light emitting diodes, in particular to a high-quality LED epitaxial structure and a preparation method thereof, through the design of a novel nucleating layer, low-density and high-quality crystal nucleuses can be formed, the density of crystal grains formed on a subsequent high-pressure coarsening layer is lower, and the size of the crystal grains is larger. And the healing time between subsequent crystal grains is prolonged, and the dislocation density at the crystal grain healing boundary is reduced. AL is doped in the initial stage of 3D oscillation starting, GaN growth on the non-C surface of the PSS can be inhibited to a certain extent, and the lattice quality is improved; in the nucleation layer and coarsening layer stages, a 3D growth mode is inclined, the V / III ratio is reduced, the pressure is improved, crystal nucleus and crystal grain growth is facilitated, the crystal nucleus density is reduced, and the dislocation density at the surface healing position can be reduced. In the growth stage of the recovery layer, a 2D / 3D mixed growth mode is inclined, the temperature is raised, the V / III ratio is increased, and the pressure is reduced, so that the healing of crystal grains is facilitated, and the transverse growth speed is higher than the vertical growth speed.

The invention discloses a preparation method of a high-hardness and high-strength ultra-fine grain copper plate, and belongs to the technical field of copper material processing. The method comprises the following steps: polishing and cleaning a copper plate; overlapping a plurality of copper plates and fixing edges; completely immersing the laminated copper plate in a low-temperature cooling medium and cooling the laminated copper plate to-196 DEG C to-190 DEG C; the pre-cooled sample is taken out and fed into a pre-cooled roller to be rolled, and single-pass rolling is completed within 60 seconds; the rolled plate is cut, surface treatment, overlapping fixing and low-temperature cooling are carried out again, and next circulation is carried out; and repeatedly carrying out multi-pass rolling, wherein the sample is kept in a low-temperature state every time. According to the method, two technologies of cryogenic treatment and accumulative ply rolling are organically combined to generate a synergistic effect, dynamic recovery and recrystallization processes are greatly inhibited by utilizing low temperature, the dislocation density is improved, the refining limit of a traditional processing mode on the grain size is broken through through large dependent variable, an ultra-fine grain even nanocrystalline structure with a uniform structure is obtained, and the method is suitable for large-scale production. And the hardness and tensile strength of the material are effectively improved.

The invention discloses a tungsten material with a double-scale heterogeneous layered structure. Fine crystal layers and coarse crystal layers which are periodically and alternately distributed are formed on the tungsten material in the thickness direction. The preparation method comprises the following steps: 1, carrying out cold isostatic pressing and pressureless sintering on the high-purity tungsten powder; 2, thermal deformation processing; and 3, performing two-stage heat treatment to obtain the tungsten material. According to the tungsten material with the double-scale layered heterogeneous structure, by means of synergistic deformation between different-scale crystal grains and crystal boundaries in different layers, crack initiation and propagation are effectively restrained, the problem of room-temperature brittleness of the tungsten material is solved, and the plasticity of the tungsten material is improved; according to the method, hot working deformation and two-stage heat treatment are carried out on the sintered blank prepared through powder metallurgy, so that the tungsten material forms a heterogeneous layered structure in which large-size recovery grains and small-size recrystallization and deformed fine grains at grain boundaries are alternately distributed, and the strength, toughness and ductility of the tungsten material are improved; the method is suitable for the fields of nuclear fusion reactor first walls, rocket engine nozzles, X-ray tube target materials and the like.

The utility model discloses a waste quartz crucible recovery device which comprises a base, a crushing chamber fixedly arranged on the right side of the upper end face of the base, a crushing mechanism arranged at the upper end of the crushing chamber, a stand column fixedly arranged in the middle of the upper end face of the base through a slewing bearing, a rotation driving mechanism arranged at the bottom of the base and an installation base arranged on the side face of the stand column in a sliding mode. A lifting driving mechanism is arranged between the stand column and the installation base in a matched mode, a first hinge seat is fixedly arranged on the side face of the installation base, clamping arms are arranged at the two ends of the first hinge seat in a hinged mode, and a clamping driving mechanism is arranged on the side face of the first hinge seat. The waste quartz crucible clamping device has the advantages that waste quartz crucibles can be clamped and accurately placed in a crushing chamber, heavy labor of manual feeding and instability of auxiliary feeding of a forklift are avoided, the crucibles can be firmly clamped by the V-shaped clamping plates and the anti-skid rubber pads on the inner sides of the front ends of the clamping arms, the crucibles are prevented from slipping off in the carrying process, and operation safety is guaranteed.

The present application relates to the technical field of sponge hafnium preparation, and provides a multistage gradient reaction furnace and method for preparing sponge hafnium, the reaction furnace comprising a machine body, a storage cylinder, a reaction cavity, a preliminary reaction box, a cylinder body, a centrifugal mechanism and a heat recovery module. The cylinder body adopts a multilayer composite structure of a permalloy magnetic guide layer, yttrium-zirconium lining, permanent magnet array and steel shell. The permanent magnet array forms a radial magnetic field, which suppresses the micro-turbulence of molten magnesium chloride, reduces the oxygen diffusion coefficient and reduces the migration of oxygen to the grain boundary. In a temperature environment of 800-1000 DEG C, under the synergistic effect of a low-oxygen grain boundary environment and a thermal gradient effect, hafnium grains grow to form uniformly distributed radiation state crystals. The reaction process is controlled by multistage gradient temperature control of 600-800 DEG C preliminary reaction, 800-1000 DEG C grain growth and 1000-1100 DEG C melting separation, combined with vibration acceleration reaction and centrifugal separation of by-products, to realize efficient and high-purity sponge hafnium preparation.

The invention discloses a recovery method of nickel-based single crystal high-temperature alloy after plastic deformation damage, the plastic deformation amount of the nickel-based single crystal high-temperature alloy is less than or equal to 3.3%, the recovery method comprises the following steps: heating the damaged nickel-based single crystal high-temperature alloy after plastic deformation to 1100 DEG C, so that the gamma'phase of the alloy begins to dissolve, a wide gamma channel is provided, and the gamma'phase of the nickel-based single crystal high-temperature alloy begins to dissolve; the first heating rate is 20-30 DEG C / min, and the heating time is less than 60 minutes; the temperature of the second heating is lower than the liquidus temperature of the gamma'phase of the alloy and higher than the temperature at which the gamma 'phase starts to dissolve, the alloy is heated to the sub-solid solution temperature for annealing, the heating rate of the second heating is lower than the heating rate of the first heating, the heating time is shorter than 20 min, and heat preservation is conducted for 2-2.5 h; therefore, the alloy retains a gamma / gamma'two-phase microstructure and single crystal characteristics. According to the method, recrystallization of nickel-based single crystals with the molding deformation amount lower than 3.3% at the room temperature can be completely avoided, recovery is achieved, and the recovery efficiency is high.