358 results about "Vacuum annealing" patented technology

A method for improving the fatigue performance of a titanium alloy seamless tube. The method comprises: S1, mixing raw materials, pressing same into a plurality of electrode blocks, and welding the plurality of the electrode blocks to obtain a consumable electrode; S2, smelting the consumable electrode 2-3 times by using a vacuum consumable electrode arc furnace, so as to obtain a titanium alloy cast ingot; S3, upsetting and drawing the cast ingot multiple times and rolling same into a titanium alloy bar; S4, subjecting the bar to precision forging, with the amount of times of heating being no more than twice; S5, annealing and straightening same, followed by turning and drilling treatments, so as to obtain a rough blank of a titanium alloy seamless tube; S6, subjecting same to multi-pass cold rolling, so as to obtain a semi-finished titanium alloy seamless tube product; S7, performing vacuum annealing and acid pickling; S8, performing electrolytic-magnetic composite polishing; and S9, performing a shot blasting treatment. The method can effectively improve the rotating bending fatigue performance, and the titanium alloy seamless tube can endure 20 million test cycles.

The invention discloses a poly-Si film preparation method based on a vertical double-layer hot wire array thermal field design, which changes the surface temperature of a hot wire and the range of a cracking high-temperature region by adjusting the interlayer spacing of a double-layer hot wire array and the current of the double-layer hot wire, expands the cracking time and the cracking space of silane, promotes secondary cracking of the silane, and improves the yield of the poly-Si film. Components and concentration distribution of a silane cracking intermediate product reaching the surface of the substrate can be effectively controlled, and the ratio of SiH / SiH2 active groups is increased; and depositing the poly-Si thin film under the vacuum of 0.5 Pa-5. 0Pa, the substrate temperature of 200-560 DEG C and the deposition time of 10-60 minutes, after deposition is finished, raising the substrate temperature to 200-650 DEG C, and carrying out vacuum annealing on the grown poly-Si thin film to obtain the high-crystallization-rate poly-Si thin film. According to the method, the poly-Si thin film is grown by using a vertical double-layer hot wire array thermal field design, a high-temperature hot wire silane cracking technology and a vacuum annealing technology, and the crystallization quality of the poly-Si thin film can be obviously improved.

The invention relates to the field of coating materials, and provides a high-wear-resistance stainless steel-based composite coating which is composed of dumbbell-shaped silver-doped silicon carbide, sea urchin-shaped titanium dioxide, 304 stainless steel powder, NiCrBSi nickel-based autolytic alloy powder and the like. The silver-doped silicon carbide is prepared through sol-gel, high-temperature carbonization and acid pickling, and the titanium dioxide filler is obtained through hydrothermal synthesis and calcination. Supersonic flame spraying deposition is adopted, the compactness and bonding strength are enhanced through laser remelting, and finally the wear resistance, the pollution resistance and the antibacterial performance are improved through vacuum annealing, mechanical polishing and hydrophobic coating modification. The design of dumbbell-shaped silver-doped silicon carbide and urchin-shaped titanium dioxide is adopted, high-wear-resistance, antibacterial and high-binding-force coating performance is achieved, the problems of wear resistance and bacteriostasis are solved, and the coating is suitable for the fields of cabinet door plates and the like.

The invention relates to a magnetic field sensor based on a room-temperature two-dimensional magnetic semiconductor material and a preparation method and application thereof, and the preparation method comprises the steps: arranging two electrodes which are not communicated with each other on an insulating substrate, obtaining a layered iron gallium tellurium material, transferring the layered iron gallium tellurium material to the insulating substrate, enabling at least one layered iron gallium tellurium material to be separated from the insulating substrate, and enabling the layered iron gallium tellurium material to be separated from the insulating substrate. The first product covers the two electrodes at the same time, tetrabutylammonium cations or oxygen plasmas are used for carrying out an intercalation reaction on the layered iron gallium tellurium material of the first product, and the layered iron gallium tellurium material of the first product is converted into an intercalated layered iron gallium tellurium material; and performing vacuum annealing to obtain the magnetic field sensor. The sensor provided by the invention reflects the magnetic field intensity by using the polarized light current between the electrodes, and can realize wide-range and high-precision magnetic field detection.

The invention discloses a preparation method of a high-temperature-resistant, high-strength, high-electric-conductivity and high-heat-conductivity copper-niobium heterogeneous nano composite fine filament, which comprises the following steps of: 1, winding a copper strip and a niobium strip, placing the wound copper strip and niobium strip in a copper sheath, carrying out homogeneous heating and isothermal hot extrusion deformation, and then carrying out multi-pass straight drawing, intermediate annealing and disc drawing to obtain a copper-niobium composite wire; 2, bundling and assembling the copper-niobium composite wires, placing the copper-niobium composite wires in a copper sheath, carrying out homogeneous heating and isothermal hot extrusion deformation, and then carrying out multi-pass straight drawing, intermediate annealing and disc drawing to obtain a copper-niobium multi-core composite round wire; and 3, performing multi-pass drawing and vacuum annealing on the copper-niobium multi-core composite round wire in sequence. The ultra-plastic deformation process combining copper and niobium winding combination with cluster drawing is adopted, the fine wire with high tensile strength, good bending and tensile plasticity, excellent high-temperature thermal stability and high-temperature stress relaxation resistance, excellent radiation resistance and excellent strong current matching is obtained, the process is simple, control is easy, and the method is suitable for industrial production. The industrial batch production is easy to realize.

The invention discloses an anode material for adipic acid monoester electrolysis and a preparation method of the anode material, the electrode solves the key problems that a platinum layer is easy to fall off, the catalytic activity is low, the organic matter poisoning resistance is poor and the like of a traditional titanium platinum-plated electrode through multi-scale interface strengthening and nano structure regulation and control; the preparation method comprises the following core steps: constructing a porous ZrO2-TiO2 composite oxide layer on the surface of a titanium substrate by adopting a micro-arc oxidation-hydrothermal composite process, and generating platinum nanoparticles in situ to pre-fill pores, so that the anchoring effect of a platinum layer is remarkably enhanced; depositing a platinum / carbon nano tube (Pt / CNT) composite catalyst layer on the surface of the oxide layer through a pulse-ultrasonic synergistic electroplating technology, wherein the carbon nano tube is used as a conductive framework to inhibit platinum agglomeration; through vacuum annealing and electrochemical activation treatment, the interface bonding force and active site exposure are further optimized; the electrode shows excellent performance in an adipic acid monoester electrolysis system, and efficient electrocatalytic conversion from adipic acid monomethyl ester to dimethyl sebacate is achieved.

The invention discloses a hydrogen embrittlement-resistant aluminum-lithium alloy and a preparation method thereof. In order to improve the hydrogen embrittlement resistance of the aluminum-lithium alloy, the element Li is injected into the two faces of the thin-plate-shaped aluminum alloy through vacuum ion injection treatment, then all the elements are fully diffused in a vacuum annealing mode, brittle Li H and Li3A1 H6 phases formed during smelting in the prior art are avoided, and then the aluminum-lithium alloy with the excellent hydrogen embrittlement resistance is obtained. In addition, the metal Hf is added into the aluminum-lithium alloy, so that the ductility of the aluminum-lithium alloy can be effectively improved. Researches show that with the increase of the content of the Hf element, the elongation of the aluminum-lithium alloy is in a trend of increasing first and then decreasing. And on the basis of metal aluminum, when the proportion of Hf is 0.9 wt%-3.5 wt%, the ductility of the alloy material is higher than 10%.

The invention provides a preparation method of a small-caliber titanium-steel composite pipe, which comprises the following steps: firstly, carrying out pipe bending forming on a titanium-steel composite plate by adopting a JCO process, and then carrying out titanium-titanium and steel-steel welding to obtain a titanium-steel composite welded pipe; and then annealing the titanium steel composite welded pipe obtained in the previous step, and then carrying out cold machining and vacuum annealing to obtain the small-caliber titanium steel composite pipe. The cold processing comprises cold rolling and / or cold drawing. According to the preparation method of the small-caliber titanium-steel composite pipe, the technical difficulty of direct compounding is reduced, the welding operation problem of small-caliber pipe titanium on the inner side is avoided, and meanwhile, the appearance precision of a cold-drawn product is higher. According to the method, the bonding strength can be guaranteed, high-precision control is achieved, and continuous and large-scale production capacity can be achieved. By the adoption of the mode, the high-precision titanium steel composite pipe with the diameter smaller than 300 mm can be obtained, and the average economic benefit can reach 0.5 million yuan / ton.

The invention discloses a manufacturing method of a high-precision intelligent instrument measuring chip and a related device. The method comprises the following steps: firstly, performing multi-stage vacuum annealing and atomic layer reduction corrosion removal on lower-layer copper interconnection, introducing thermal-electric synergistic stress to convert a vacancy-rich layer into < 111 > preferred grains, and obtaining a bonding preparation surface with consistent crystal orientation; and then low-temperature copper-copper thermocompression bonding is completed in a controlled inert atmosphere, and interconnection initial thermoelectric force is intercepted in real time. The method comprises the following steps: establishing a vertical heat flow according to a space mapping power consumption sequence by driving an upper-layer functional region, collecting an interface voltage response, and extracting an interconnection Seebeck deviation through time sequence registration and differential processing; and according to a deviation result, synchronous fusing and parallel connection are implemented by using a programmable metal section of the rewiring layer, a thermoelectric balance interconnection network is constructed, and a zero drift calibration value is written in. According to the scheme, direction-dependent thermoelectromotive force is eliminated in a closed mode on the three levels of material, measurement and interconnection reconstruction, and therefore long-term zero drift stability of a measurement chain is guaranteed under the nanovolt-level noise condition.

The invention provides a production method of a cold-rolled titanium steel composite plate coil. Industrial production is achieved through the following steps that S1, the titanium steel composite plate coil is selected as a cold-rolled raw material; s2, removing the titanium layer at the head and the tail of the raw material to expose the steel base material, and welding the steel base material with the stainless steel leading tape; s3, a continuous annealing furnace is adopted for annealing the composite plate coil welded in the step S2, shot blasting is carried out after annealing, and acid pickling is carried out after shot blasting; a reversible reciprocating rolling mill is adopted for rolling, a constant rolling force mode is adopted for cold rolling, the accumulative deformation is controlled to be 50%-75%, and the single pass is smaller than or equal to 15%; s5, degreasing the cold-rolled composite plate coil; s6, carrying out multi-step vacuum annealing on the degreased composite plate coil; s7, flattening the composite plate roll subjected to vacuum annealing; and S8, the flattened composite plate coil is pulled and straightened, and the cold-rolled titanium steel composite plate coil is prepared. According to the method, the continuous production of the cold-rolled titanium steel composite plate coil with good performance can be realized by adopting a conventional production line without first-pass heavy reduction or a special powerful rolling mill.

The invention discloses a preparation method of an ABM ceramic substrate with a metal through hole, and particularly relates to the technical field of ceramic substrates, a Si3N4 ceramic substrate is prepared through tape casting and hot pressed sintering, a conical stepped through hole is processed by using ultrafast femtosecond laser, the aperture of the through hole is 100-300 [mu] m, and the smoothness of the wall of the through hole is Rat; 1 [mu] m; performing oxygen plasma activation on the inner wall of the through hole to generate a Si-O active group; sputtering a nano titanium transition layer to enhance metal-ceramic interface bonding; the through holes are filled layer by layer through pulse electrochemical deposition, the current density is controlled, and a compact non-porous structure is achieved; in-Sn-Ag low-temperature active brazing filler metal is used, and a surface copper layer is bonded under the assistance of plasma; a fine circuit is formed through photoetching and micro-electroplating, the line width and the spacing of the circuit are the same, and the line width and the spacing of the circuit are both smaller than 20 microns; etching a micro-channel network on the back surface of the substrate by using ultraviolet laser, and filling heat-conducting silicone grease; and finally, carrying out vacuum annealing for 2 hours in an environment with the temperature of 250 DEG C.

The invention provides an antenna oscillator production method, an antenna oscillator and communication equipment, and the method comprises the following steps: S1, material pretreatment: selecting a high-conductivity titanium-aluminum alloy plate, eliminating initial stress through vacuum annealing, and after annealing, removing an oxide layer and organic matters through plasma cleaning equipment; and S2, composite forming: carrying out stamping and stretching forming on the titanium-aluminum alloy plate by using a die to form an antenna oscillator, and integrating a fiber bragg grating sensor in the stamping process to monitor the stress distribution of the material in real time. According to the production method of the antenna oscillator, the antenna oscillator and the communication equipment, the annealing and cooling processes are accurately controlled, and the stress distribution is monitored in real time by using the FBG sensor, so that the production period of the antenna oscillator is remarkably shortened, the waiting time in the production process is reduced, and the production efficiency is improved. The problems of deformation, cracking and the like caused by stress concentration in the machining process of the antenna oscillator are greatly reduced, the rejection rate is reduced, and waste of raw materials and energy is reduced.

The invention discloses a self-lubricating aluminum coating and a preparation method thereof.The preparation method comprises the steps that molybdenum disulfide is pretreated through a silane coupling agent, tetraethoxysilane mixed liquor is added, the pH is adjusted to be 9-10, a water bath reaction is conducted, and molybdenum disulfide-silicon dioxide microcapsules are obtained after high-temperature strengthening treatment; respectively adding a zinc nitrate solution and a hexamethylenetetramine solution, adjusting the pH value to 10-11, carrying out a high-temperature and high-pressure hydrothermal reaction to obtain zinc oxide nanorods, and carrying out ball milling treatment on the zinc oxide nanorods, microcapsules, stearic acid and zirconium oxide balls under the protection of argon to obtain doped microcapsules; after raw materials are pretreated, the raw materials and a dispersing agent solution are added into a mixer respectively, spraying powder, a pretreated base body and the spraying powder are obtained after mixing treatment, spraying treatment is conducted on the surface of the base body through a plasma spraying method, and the self-lubricating aluminum coating is obtained after vacuum annealing treatment. Therefore, the obtained self-lubricating aluminum coating is low in friction coefficient, high in performance and excellent in self-lubricating property.

According to the high-strength and high-toughness titanium alloy flux-cored wire and the preparation method and additive manufacturing application thereof, the flux-cored wire with good comprehensive performance is obtained by optimizing alloy components and a flux core formula and improving a preparation process according to material characteristics, so that the fluidity of a welding pool is improved, the stability of a welding arc is improved, and a welding seam structure is controlled. Meanwhile, the high-strength and high-toughness titanium alloy flux-cored wire is applied to the field of additive manufacturing, high-quality titanium alloy part additive manufacturing is achieved, the strength, toughness and corrosion resistance of parts are improved, and the strict requirements of the high-end manufacturing industry for the titanium alloy material performance can be met. The process can be simplified, cold continuous rolling is combined with vacuum annealing, 1-4 procedures are reduced compared with a traditional process, and efficiency is improved by 30%; the additive manufactured metal is high in obdurability, the crack resistance is superior to that of a conventional welding wire, and the crack rate is reduced by 50%; the method is suitable for electric arc additive manufacturing, thick plate welding and dissimilar titanium alloy connection, and the application prospect is wide.

The utility model relates to vertical annealing equipment for a metal ultra-thin strip and an operation method, and belongs to the related technical field of metal ultra-thin strip hot working, the vertical annealing equipment comprises a furnace body device, a tension measuring device, a direction roller, an unwinding device, a winding device, a straightening device and a deviation rectifying device, the furnace body device comprises a muffle tank and a furnace body shell, a plurality of groups of elastic brackets fixedly connected with the furnace body shell are arranged on the outer side of the muffle tank in the length direction of the muffle tank, and the top of the muffle tank is fixedly connected with the top of the inner side of the furnace body shell through the top elastic bracket, so that the service life of the muffle furnace is prolonged; one side of the furnace body shell is respectively connected with a molecular pump and a gas inlet through steel pipes, the other side of the furnace body shell is provided with a gas outlet, and pipelines for connecting the molecular pump, the gas inlet and the gas outlet are respectively provided with a gas valve, so that the conversion between vacuum annealing and atmosphere annealing in the muffle furnace is realized; and the straightening device comprises a plurality of straightening rollers, so that high-precision straightening can be carried out on the annealed metal ultra-thin strip, and the strip shape quality of the strip is effectively improved.

The invention relates to the technical field of titanium alloy pipe manufacturing, and particularly discloses a preparation method of a titanium alloy thin-walled pipe with superplasticity, comprising the following steps: S110, annealing a titanium alloy bar below a phase transformation point in a vacuum annealing furnace; s120, the annealed bar material is subjected to reciprocating extrusion treatment; s130, the bar subjected to reciprocating extrusion treatment is subjected to forward extrusion to form a pipe blank; s140, the pipe blank is subjected to superplastic bulging treatment; s150, after superplastic bulging is finished, heat preservation is stopped, and inert shielding gas continues to be blown in for cooling to the room temperature; and S160, stress relief annealing is conducted on the thin-walled pipe obtained after superplastic bulging, and the titanium alloy finished pipe with superplasticity is obtained. According to the method, the plasticity of the titanium alloy pipe is remarkably improved through reciprocating extrusion and superplastic bulging, the deformability is improved, meanwhile, the grain size is regulated and controlled, and preparation of the high-performance and high-size-precision thin-wall pipe is achieved.

The invention discloses a method and a system for improving the bonding capacity of a titanium-based material in superplastic forming / diffusion bonding, and belongs to the field of titanium alloy material heat treatment and hot working. In order to solve the problem that in the prior art, the connection quality is reduced due to hydrogen dissipation in the high-temperature SPF / DB process of titanium hydride alloy, hydrogen is mixed into an inert gas pressure source, the environmental hydrogen partial pressure is increased to inhibit hydrogen element loss, and therefore the diffusion connection capacity is improved. The method comprises the specific steps that a titanium alloy plate is subjected to hydrogen treatment, cleaned and sprayed with a separant, then the titanium alloy plate is placed in a mold to be vacuumized, argon-hydrogen mixed gas is introduced to serve as a pressure source, and forming and connecting are completed through rapid heating and pressure maintaining; and after the process is finished, carrying out vacuum annealing in a dehydrogenation temperature range to remove hydrogen elements, and introducing argon to accelerate cooling. The hydrogen element can be effectively reserved to improve the joint quality, meanwhile, the dehydrogenation step is simplified, and the method is suitable for the field of titanium-based material hot working, especially the technical field of titanium hydride alloy superplastic forming / diffusion bonding.

The invention discloses a high-entropy alloy coating and a preparation method thereof, and relates to the technical field of preparation of high-entropy alloy coatings. The high-entropy alloy and the coating of the high-entropy alloy do not contain silicon elements, and the preparation method comprises the steps that according to the composition proportion of the high-entropy alloy, a magnetron sputtering technology is adopted, metal elementary substance targets of all components serve as sputtering target materials for sputtering, elementary substance films are sequentially deposited on a base body, and a multi-layer film precursor is formed; and then the multi-layer film precursor is subjected to vacuum annealing, so that the single-layer uniform high-entropy alloy coating is obtained. According to the method, accurate preparation of the multi-layer film precursor can be achieved by accurately controlling the sputtering rate or sputtering power of all elements, then the elements in the multi-layer film precursor are fully mixed through vacuum annealing treatment, and the uniform high-entropy alloy coating is formed. The high-entropy alloy coating prepared by the process, such as an AlCoCrFeNi high-entropy alloy coating, has excellent structural uniformity, and is suitable for the high and new technical fields of aerospace, energy engineering and the like.

The invention discloses a NiCoCrAlYHfRe coating for Ni-based high-temperature alloy and a preparation method of the NiCoCrAlYHfRe coating, and belongs to the technical field of high-temperature protective coatings. The NiCoCrAlYHfRe coating is deposited on the Ni-based high-temperature alloy matrix by adopting an arc ion plating technology and a vacuum annealing treatment method. Compared with a traditional MCrAlY (M = Ni / Co) high-temperature protective coating, active elements Hf and Re are added into the coating, stripping of an oxidation film can be effectively delayed, the high-temperature oxidation resistance of the coating is improved, and therefore the service life of the coating is effectively prolonged. The NiCoCrAlYHfRe coating disclosed by the invention is simple in preparation process, controllable in component, good in repeatability and easy to realize industrial popularization.

The invention provides a method for improving the yield of TA18 titanium alloy seamless tubes, which specifically comprises the following steps of: 1, mixing and pressing raw materials into a plurality of electrode blocks, welding to obtain a consumable electrode, and adding 0.001 to 0.03 mass percent of alloy element yttrium into the raw materials; 2, a titanium alloy cast ingot is obtained through smelting; thirdly, the titanium alloy cast ingot is directly subjected to heat preservation for 4.5 h to 7.5 h at the temperature of 1050 DEG C to 1150 DEG C without scaling, and hot continuous rolling is conducted to form a titanium alloy bar; 4, performing cross piercing to form a tubular billet; fifthly, the tubular billet is subjected to one-pass cold rolling after being subjected to acid pickling; sixthly, the pipe blank is internally bored and externally lathed, and hot continuous rolling is conducted after annealing; seventhly, after acid pickling, the outer surface is polished, and the inner surface is honed; eighthly, cold rolling does not exceed four passes; ninthly, straightening, acid pickling and vacuum annealing are conducted; and tenthly, magnetic polishing is conducted. By means of the method, the yield of the TA18 titanium alloy seamless tube can be increased by 40% or above.

The invention relates to the technical field of thin-wall metal part plastic forming, in particular to a thin-wall metal bulging forming method based on liquid phase change expansion, which comprises three continuous steps of pretreatment, freezing bulging and post-treatment, and specifically comprises the following steps: pretreatment: selecting a thin-wall metal pipe, and carrying out surface friction optimization treatment on the inner wall of the thin-wall metal pipe; an elastic buffer layer is arranged between the inner wall of the thin-wall metal pipe and the phase change medium; a phase change medium is injected into the thin-wall metal pipe, the filling rate of the phase change medium is 100%, freezing bulging is conducted, specifically, the pretreated thin-wall metal pipe serves as a forming part, and the thin-wall metal pipe is loaded into a precision forming tool and sealed; and post-treatment is conducted, specifically, stress relief treatment is conducted on the bulged thin-wall metal pipe, and the stress relief treatment is a 300-DEG C vacuum annealing process. According to the method, the defects of an existing bulging technology are remarkably overcome, and breakthrough is achieved in the aspects of technical performance, cost efficiency, environmental protection, safety and application expansion.

The invention discloses an amorphous nanocrystalline magnetic material production method, which relates to the technical field of amorphous nanocrystalline, and comprises the following operation steps: S1, material preparation; s2, alloy smelting, wherein the prepared raw materials are added into a vacuum induction smelting furnace according to a specific proportion; s3, single-roller rapid quenching strip manufacturing is conducted, specifically, smelted alloy liquid flows out through a nozzle at the bottom of the vacuum induction smelting furnace and is sprayed to the surface of a copper roller rotating at a high speed, and the alloy liquid is solidified into a thin strip; s4, nano-crystallization treatment: putting the prepared amorphous ribbon into a vacuum annealing furnace for annealing treatment; s5, magnetic field heat treatment, wherein after annealing treatment, the thin strip is placed in a high-intensity magnetic field environment to be subjected to heat treatment again; and S6, forming processing: winding the thin strip into an inductance coil by using a winding device. According to the production method of the amorphous and nanocrystalline magnetic material, the operation steps are simpler, the production efficiency of amorphous and nanocrystalline is higher, and the quality of the material is better.

The invention relates to a cerium-iron-boron permanent magnet material with low content of a non-magnetic phase CeFe2 and a preparation method of the cerium-iron-boron permanent magnet material. The cerium-iron-boron permanent magnet material is composed of the following components in percentage by atom: 11%-17% of Ce, 70%-80% of Fe, 5%-10% of B, 0.1%-3% of Co, 0.1%-3% of Zr and 0.1%-5% of La. The preparation method comprises the following steps of S1, smelting, wherein Ce, La, Fe, Co, Zr and FeB are prepared into a CeLaFeCoZrB alloy cast ingot through electric arc smelting according to the atomic percent composition; s2, melt-spinning: crushing the CeLaFeCoZrB alloy ingot prepared in the S1, and then preparing an alloy strip by using a melt rapid quenching method; and S3, magnetic field annealing: performing vacuum annealing on the alloy strip prepared in S2, wherein the annealing temperature is 2-12K below the Curie temperature Tc of the alloy. Compared with the prior art, the method has the advantages that the phase volume fraction of the non-magnetic CeFe2 phase in the cerium-iron-boron permanent magnet material alloy is remarkably reduced, and the residual magnetism and the maximum magnetic energy product of the alloy are improved.

The utility model discloses a vacuum annealing furnace convenient and rapid to cool, which relates to the technical field of vacuum annealing furnaces, and adopts the technical scheme that the vacuum annealing furnace comprises an outer hearth, vent holes are formed in two sides of the outer hearth, a cooling driving component is arranged at the top of the outer hearth, an inner hearth is fixedly arranged in the outer hearth, and a cooling mechanism is arranged outside the inner hearth; the vacuum annealing furnace convenient and rapid to cool has the beneficial effects that cold air is evenly blown to the outer portion of the heat dissipation fin set through rotation of the fan blades, the heat dissipation fin set can be comprehensively subjected to wind, the heat exchange efficiency is improved, air circulation is accelerated through the fan blades, the heat exchange efficiency is improved, and the heat exchange efficiency is improved. And cold air is blown to the heat dissipation fin set to cooperate with cooling water circulation in the cooling pipe, so that the heat dissipation efficiency of the heat dissipation fin set is improved, then the heat dissipation fin set can replace heat of the inner hearth more quickly, the inner hearth is cooled more quickly, and the cooling speed is increased.

According to the Ta-based refractory alloy reinforced by the silicide phase eutectic structure and the preparation method of the Ta-based refractory alloy reinforced by the silicide phase eutectic structure, nanoscale HfSi2 powder is introduced, and the alloy reinforced by the silicide phase eutectic structure is formed in the Ta-based alloy. According to the alloy, particles or powder of refractory metal elements such as Ta serves as a matrix raw material, nanoscale HfSi2 powder is introduced into the matrix raw material, an alloy ingot is prepared through a smelting process, and the alloy material is subjected to sufficient deformation recovery and homogenization through multiple times of pressure processing and high-temperature vacuum annealing treatment. A multi-level spherical eutectic structure exists in the alloy prepared through the method, the silicide phase serves as a strengthening phase, dislocation movement can be effectively inhibited, and the room-temperature mechanical property of the alloy is remarkably enhanced. The room temperature tensile elongation is about 30%, the yield strength is about 600 MPa, the tensile strength is about 700 MPa, and compared with a traditional Ta-based alloy, the tensile strength is obviously improved. The alloy of the system can be widely applied to structural parts by means of plastic deformation processing, heat treatment and the like.

The invention relates to a preparation method of a molybdenum-titanium alloy target material, which comprises the following steps: mixing molybdenum powder and titanium powder in a protective gas atmosphere to obtain mixed powder; the mixed powder is subjected to cold isostatic pressing, sheath degassing, hot isostatic pressing and vacuum annealing in sequence, and then the molybdenum-titanium alloy target material is obtained; the average particle size of the molybdenum powder is 3-5 [mu] m, and the average particle size of the titanium powder is 100-150 [mu] m; according to the preparation method, the molybdenum-titanium alloy target material which only contains a pure molybdenum phase and a molybdenum-titanium alloy phase and is high in density and low in content of gas impurity elements is prepared by selecting raw materials with specific particle sizes and matching specific procedures; wherein the proportion of the molybdenum-titanium alloy phase is preferably as high as 50% or above, the density is preferably as high as 99.9% or above, the hydrogen content is preferably as low as 3 ppm or below, the oxygen content is preferably as low as 576 ppm or below, and the problem that the product yield is low due to the fact that an existing molybdenum-titanium target is likely to be abnormal in the sputtering process is effectively solved.

The invention discloses a preparation method of a zirconium alloy ultra-thin plate for a nuclear fuel assembly grillwork. The preparation method comprises the following steps that 1, burdening and multiple times of vacuum suspension smelting are conducted; secondly, water cooling is conducted after cogging forging is conducted; step 3, performing hot extrusion after peeling; fourthly, multi-pass hot rolling and annealing are conducted; fifthly, cold rolling and vacuum annealing are conducted through a synchronous rolling mill, and then cold rolling and vacuum annealing are conducted through an asynchronous rolling mill; the invention further discloses the zirconium alloy ultrathin plate for the nuclear fuel assembly grillwork. According to the preparation method, the asynchronous rolling mill with the upper and lower rollers at different rotating speeds is adopted for rolling, the warping problem caused by uneven deformation of the upper and lower surfaces in the plate rolling process can be solved, and the plate thickness uniformity is improved; and a shearing force with a certain angle is introduced to crush the crystal grains in the normal direction, so that the orientation distribution of the crystal grains is optimized, the zirconium alloy ultrathin plate with high flatness and high thickness uniformity is obtained, and the method is suitable for the technical field of nuclear rare metal materials.

The invention relates to the technical field of semiconductor material preparation, in particular to a gallium nitride single crystal wafer material preparation method which comprises the following steps: placing a silicon carbide substrate slice larger than a standard size in an accommodating groove of a graphite tray, and installing a cylindrical silicon nitride ceramic protective cover to assemble a substrate tray; putting the substrate tray into a magnetron sputtering growth chamber to prepare a zinc-aluminum-oxygen polycrystalline thin film and an aluminum nitride polycrystalline thin film in sequence; the substrate tray is placed in a high-temperature and high-vacuum annealing furnace chamber for high-temperature and high-vacuum annealing treatment, and the substrate tray is placed in a hydride vapor phase epitaxy reaction chamber for preparing the gallium nitride single crystal thick film material; cutting, grinding and polishing the peeled gallium nitride single crystal thick film wafer with the size larger than the standard size to obtain a gallium nitride single crystal wafer material with the standard size; and the stripped silicon carbide substrate slice and the used cylindrical silicon nitride ceramic protective cover can be repeatedly used after being cleaned. According to the method, low-stress, low-dislocation-density, low-cost and high-yield preparation of the standard-size gallium nitride single crystal wafer material can be realized.

The present invention provides a production method for small-diameter thick-wall titanium alloy seamless tubes, comprising: Step 1: obtaining a titanium alloy ingot through three times of VAR melting; Step 2: blooming, drawing out, and radial forging the titanium alloy ingot into a round bar, and machining the round bar into a hollow tube blank through deep hole drilling, internal honing, and external turning; Step 3: performing three passes of cold rolling on the hollow tube blank to produce a finished titanium alloy seamless tube; sampling the titanium alloy tube after each pass of cold rolling, observing its crack defects, removing the crack defects, and performing intermediate vacuum annealing after removing the crack defects; Step 4: performing vacuum annealing, straightening, pickling, ultrasonic testing, and packaging on the titanium alloy finished tube in Step 3 to produce a small-diameter thick-wall titanium alloy seamless tube. The present invention comprehensively formulates measures from aspects such as tube blank specification design, tube blank processing technology, titanium alloy tube cold rolling process design, vacuum annealing process design, and internal and external surface defect treatment technology of the tube blank to solve the problem of internal surface cracks in cold rolling of small-diameter thick-wall titanium alloy seamless tubes.

The application discloses a preparation method of a zirconium alloy rod for a nuclear fuel assembly end plug, and comprises the following steps: first, a zirconium alloy forging rod is subjected to machining and lubrication, heated and kept warm, and then extruded, and after extrusion, the extruded rod blank is obtained by sequentially performing straightening and polishing treatment; second, the extruded rod blank is heated and kept warm again, and then subjected to multi-pass hot rolling, and after hot rolling, the hot-rolled rod blank is obtained by centerless peeling; third, the hot-rolled rod blank is subjected to multi-pass pilger two-roll cold rolling to obtain a cold-rolled rod blank; fourth, the cold-rolled rod blank is subjected to vacuum annealing treatment to obtain an annealed rod blank; and finally, the annealed rod blank is subjected to finishing treatment, which sequentially comprises straightening, centerless grinding and degreasing, so that the target product is obtained; and the key parameters such as temperature, holding time and deformation amount of each step are strictly controlled. The preparation method breaks through the key technology of long rod cold rolling, realizes large plastic deformation of the zirconium alloy rod, significantly reduces deformation passes and intermediate heat treatment, and thus breaks through the problems of non-uniform structure, low production efficiency and insufficient product precision and the like existing in the traditional process.