1096 results about "Surface oxidation" patented technology

The invention provides a production method of an invar alloy 4J36 hot-rolled coil, belongs to the technical field of invar alloy 4J36 hot rolling, and solves the problem that the invar alloy 4J36 hot-rolled coil needs to be efficiently produced. The plate blank is preheated and then heated after being ground, and the heated plate blank is subjected to high-pressure water descaling; and the descaled plate blank is rolled into an intermediate blank through seven-pass rough rolling, the intermediate blank is rolled into a black coil through five-pass steckel mill finish rolling, and the black coil is rolled into an invar alloy 4J36 hot-rolled black coil finished product. The method comprises the steps of slab component control, slab preheating and heating, rough rolling to obtain an intermediate slab, steekle mill rolling, coiling and the like, and surface oxidation generated in the heating process is reduced by adjusting the heating process; and through rolling of the steekle mill, dynamic recrystallization is fully carried out, the surface quality of the produced invar alloy 4J36 hot-rolled coil meets the product requirement, and the yield and the production efficiency are both remarkably improved.

The invention relates to the technical field of coatings, and discloses a product wear-resistant and corrosion-resistant remanufacturing process method based on laser deposition, which comprises the following steps: surface pretreatment: pretreating the substrate surface of a product to remove a surface oxide layer, oil stains and other impurities so as to improve the adhesive force of the coating; laser cladding coating preparation: a first wear-resistant coating is deposited on the surface of the pretreated matrix through a laser cladding process, and the wear-resistant coating is Fe-based or Co-based multi-component alloy powder; an ion deposition coating is prepared, specifically, a second corrosion-resistant coating is formed on the first coating through the ion deposition technology, and the corrosion-resistant coating is made of a ceramic material. Through the design of the functional gradient coating, the combination of the toughness of the inner layer and the hardness of the outer layer is realized, the wear resistance and the corrosion resistance are improved, the adhesive force is enhanced through metallurgical bonding, cracking and peeling are avoided, the residual stress is eliminated through low-temperature annealing and polishing, and the stability and the service life of the coating in a high-wear and high-corrosion environment are ensured.

The invention belongs to the technical field of electrocatalytic oxidation, and particularly relates to an electrocatalytic active anode film capable of efficiently producing active chlorine and a preparation method and application of the electrocatalytic active anode film. Porous foam titanium is used as a base material, a surface oxidation layer is removed through acidification pretreatment, a titanium dioxide nanotube array grows on the base material in situ through two times of anodic oxidation to serve as a middle layer, and the binding force of the catalyst and the substrate is effectively improved; meanwhile, Ti < 4 + > in TiO2 is partially converted into Ti < 3 + > through a cathode reduction method, so that the conductivity of the material can be enhanced; furthermore, a RuO2 catalytic layer capable of reducing the chlorine evolution potential is loaded on the titanium dioxide nanotube array, so that the electrocatalytic activity is improved. The prepared anode film has a porous structure, and when the anode film is applied to a Flow-through system, the yield of active chlorine and the contact oxidation efficiency of pollutants on an interface of the anode film are improved, and the problem of mass transfer limitation is solved. The electrocatalytic active anode film can realize high-efficiency decoloration of printing and dyeing wastewater under the conditions of no addition of chemicals and low energy consumption.

The invention belongs to the technical field of metal material surface oxidation, and particularly relates to a gradient micro-arc oxidation preparation system and method. The system comprises a pretreatment device, an electrolyte batching device and a micro-arc oxidation device, and the pretreatment device is used for removing oil stains and oxide layers on the surfaces of workpieces and mechanically polishing the surfaces of the workpieces; the electrolyte batching device is used for mixing and preparing electrolyte used for workpiece micro-arc oxidation; the micro-arc oxidation device comprises a reactor containing electrolyte, and a workpiece is subjected to micro-arc oxidation in the reactor; the pretreatment device, the electrolyte batching device and the micro-arc oxidation device are sequentially connected according to an industrial production sequence. In addition, the invention further discloses a gradient micro-arc oxidation preparation method. The uniform and smooth color gradient effect on the surface of the metal material is achieved by accurately regulating and controlling key parameters such as electrolyte components, voltage, current density, oxidation time and temperature in the oxidation process.

The invention provides a method for automatically measuring the thickness of an oxide layer on the surface of an aluminum profile, and the method comprises the steps: scanning a hanging tool contact region on the surface of the aluminum profile, obtaining an aluminum profile surface image, carrying out the edge contour recognition of the aluminum profile surface image, determining the coordinate position of a hanging tool contact point, and obtaining a contact point region range; dynamically adjusting a measurement probe avoidance path according to the boundary coordinates of the uncertain measurement area, generating a measurement track bypassing the uncertain measurement area, and determining a compensation measurement point position sequence according to the boundary of the effective measurement area and the uncertain measurement area; the measuring probe is guided to execute thickness scanning in the effective measuring area through the compensation measuring point position sequence, the oxide layer thickness value of each measuring point is obtained through scanning, and an oxide layer thickness data set is formed; and generating a final oxide layer thickness evaluation report according to the corrected thickness value and the effective measurement area range, and fusing the boundary coordinates of the uncertain measurement area and the oxide layer thickness distribution characteristics to determine the surface oxide layer thickness of the aluminum profile.

The invention discloses a high-rate graphite negative electrode material, a preparation method thereof and a lithium ion battery, and the high-rate graphite negative electrode material is prepared by the following method: oxidizing raw material coke to oxidize the surface of the raw material coke to obtain oxidized raw material coke; carrying out pre-carbonization and graphitization sintering on the oxidized raw material coke to form graphite coated with a hard carbon layer on the surface so as to obtain a graphite negative electrode precursor; and mixing the graphite negative electrode precursor with an asphalt material, performing carbonization sintering, and further forming a soft carbon coating layer on the surface of the hard carbon coating layer to obtain a soft and hard carbon coated graphite material, namely the graphite negative electrode material. According to the method, the raw material coke is subjected to surface oxidation treatment, high-temperature carbonization and graphitization, so that hard carbon layer coating is formed on the surface of the obtained graphite in situ, the rate capability of the obtained graphite negative electrode material can be further improved, and the cycle performance and the first-effect performance can also be considered.

The invention relates to the field of battery materials, in particular to a preparation method and application of a high-rate silicon-carbon negative electrode material. The preparation method of the high-rate silicon-carbon negative electrode material comprises the steps of silicon powder pretreatment, silicon-carbon powder composite ball milling, phosphoric acid treatment, high-temperature carbonization and the like. The preparation method of the high-magnification silicon-carbon negative electrode material is simple in process and high in success rate, the cycle stability of a negative electrode is effectively improved, the silicon-carbon negative electrode material has the characteristics of low expansion volume and long cycle life, the phenomenon that a surface oxide layer hinders lithium ion diffusion is avoided, and the service life of the silicon-carbon negative electrode material is prolonged. The comprehensive performance requirement of the existing lithium ion battery on the negative electrode material is met, and the application potential is very wide.

The invention relates to the field of composite material ultrathin laminated plates, in particular to a preparation method of a SiC fiber reinforced Ti-based composite material ultrathin laminated plate. The method comprises the following steps: plating Ti alloy on the surface of SiC fiber by using a physical vapor deposition method; the titanium alloy foil is subjected to acid pickling to remove a surface oxide layer and impurities; the plated fibers are tightly arranged to form a SiCf / Ti alloy plate, the upper surface and the lower surface of the SiCf / Ti alloy plate are bonded to a titanium alloy foil through an adhesive, and a foil-plate-foil prefabricated body is manufactured; sealing the periphery of the prefabricated body, covering gaskets on the upper surface and the lower surface of the prefabricated body, removing the adhesive from the prefabricated body, and placing the prefabricated body in a vacuum hot-pressing mold; and a hot-pressing process is adopted to realize densification composite molding of the laminated plate. According to the method, uniform distribution of SiC fibers is achieved, the mechanical property of the material is effectively improved, the surface flatness is good after the laminated plate is prepared, and the method is suitable for weight reduction application of aerospace structural parts such as skins and reinforcing ribs.

The invention discloses a novel tin-plated copper-clad aluminum alloy wire coating process and a preparation method, and the novel tin-plated copper-clad aluminum alloy wire coating process comprises the following steps: rolling an aluminum alloy material into an aluminum alloy rod through a continuous casting and rolling process in a smelting process; removing an oxide layer on the surface of the aluminum alloy rod; the surface of the aluminum alloy rod with the surface oxide layer removed is coated with a copper strip; drawing and exhausting after coating the copper strip to form a copper-coated aluminum alloy wire blank; the copper-clad aluminum alloy wire blank is subjected to drawing, medium wire drawing, fine wire drawing and annealing treatment to form a copper-clad aluminum alloy wire; and the copper-clad aluminum alloy wire enters a tinning machine and is coated with a tinning layer on the surface to form the tinned copper-clad aluminum alloy wire. The core wire of the tin-plated copper-clad aluminum alloy wire is the copper-clad aluminum alloy wire, the outer layer of the copper-clad aluminum alloy wire is copper, the interior of the copper-clad aluminum alloy wire is made of a high-strength and high-conductivity aluminum alloy material, and the mechanical property and the electrical property of the tin-plated copper-clad aluminum alloy wire are superior to those of a copper-clad aluminum wire, a copper-clad aluminum alloy wire and an aluminum-magnesium wire which are used at present.

The invention relates to the technical field of image data processing, in particular to an aluminum material surface oxidation film defect detection method and system. The method comprises the steps that surface images of the surface of the aluminum material at multiple angles are collected through a preset rotary shooting device; constructing a gray difference feature vector of each pixel point according to spatial direction vectors and gray value difference features of each pixel point and neighborhood pixel points in the surface image; acquiring matched pixel points of the pixel points at different angles by utilizing a pixel point matching relationship; determining a reflection characteristic change vector according to the gray difference characteristic vector difference characteristic between the matched pixel points under the adjacent angles; determining a defect probability value of the corresponding physical position point according to the modulus length change characteristic of the reflection characteristic change vector; and marking the pixel points of which the defect probability values are not lower than the abnormal threshold value as abnormal pixel points, clustering the abnormal pixel points to obtain the defect area, and performing grade marking on the defect area in the surface image, thereby improving the defect identification accuracy.

The invention discloses an injection molding aluminum alloy feed and a preparation process thereof, the feed is composed of aluminum alloy powder and a compound binder, and the aluminum alloy powder is composed of Si, Fe, Cu, Mn, Mg, Zn, Cr, Ti, Co and Al; according to the technical scheme, aiming at the technical problems that a brittle phase is easy to form due to high magnesium and silicon content of the 6013 aluminum alloy, the interface bonding force is poor, the sintering shrinkage is difficult to control and the like due to a stable surface oxide film, and through collaborative optimization of a formula and a process, the high-magnesium-silicon-content high-magnesium-silicon-content high-brittleness aluminum alloy is obtained; the feeding and finished product performance is obviously improved; and the prepared aluminum alloy part has the advantages of high sintering density, high hardness, high tensile strength, high elongation and the like, and can meet the manufacturing requirements of high-end fields such as aerospace and traffic transportation on complex precision parts.

The invention discloses a heat treatment process for a high-strength automobile fastener wire rod, and belongs to the field of automobile fastener machining. Comprising the following steps that S1, metal wires are pretreated, and pretreatment comprises ultrasonic cleaning, chemical oil removal and continuous flushing and drying; s2, the metal wire pretreated in the S1 is placed in a heating environment filled with carbon potential control gas and heated to be in a complete austenitizing state, and an online temperature monitoring means is adopted in the period; and S3, high-frequency induction heating is conducted on the metal wire through high-frequency induction heating equipment, and full-section temperature balanced temperature rise is achieved. Through combination of vacuum pretreatment and short-time high-temperature induction heating, surface oxidation and carbon dissipation are effectively reduced, the thickness of a complete decarburized layer and the thickness of a total decarburized layer are remarkably reduced, and the surface strength and fatigue performance of the fastener are improved.

The present invention provides a method for analyzing the highest temperature experienced by an electrothermal alloy based on surface color. The 0Cr25Al5 electrothermal alloy and its products work in an air atmosphere and a high temperature environment. The surface is oxidized at high temperature to produce an oxide film. The higher the temperature, the faster the oxidation speed, and the thicker the oxide film thickness. The oxide film is extremely thin and dense, and can show interference colors. The color of the interference color is related to the thickness of the oxide film. After the 0Cr25Al5 electrothermal alloy and its products experience high temperature oxidation for a certain period of time, the thickness of the oxide film generated is related to the highest temperature experienced. The visible light reflectivity test using a spectrophotometer can obtain the visible light wavelength with the highest reflectivity. Substituting it into the formula given by the present invention, the highest temperature experienced by the 0Cr25Al5 electrothermal alloy and its products can be calculated. The advantages of the method of the present invention are: no need to prepare for the test in the early stage; no need to observe the 0Cr25Al5 electrothermal alloy and its products when they are working; non-contact type is adopted, and the surface of the test object is not damaged.

The invention relates to the field of screw forming, and discloses a screw cold heading forming process which is characterized by comprising the following steps: step 1, wire preparation and surface pretreatment: based on the requirement of screw forming on the surface quality of raw materials, a metal wire is treated by adopting a mechanical wiredrawing and chemical phosphating and saponifying composite process, and the surface of the metal wire is treated; surface oxide skin is removed, a lubricating film layer is formed, and the forming flowability and the service life of the die in the subsequent cold heading process are effectively improved. A raw material is subjected to spheroidizing annealing treatment in a continuous spheroidizing annealing furnace, internal pearlite is converted into spherical cementite, the ductility and deformation uniformity of the material are improved, then a continuous wire drawing machine is adopted for multi-stage drawing diameter reduction, a three-stage chemical phosphating-saponification treatment process is matched, a low-friction and high-adhesion lubricating film layer is formed, and the service life of the lubricating film layer is prolonged. And a stable material basis and a lubricating environment are provided for the subsequent cold heading process, so that the problems that the friction resistance generated in the forming process of a screw material is large, and a mold is quickly worn are solved.

The invention discloses a needle bed for testing an integrated circuit, and relates to the technical field of test needle beds. The device comprises a transverse plate, the top of the transverse plate is in sliding fit with a storage plate, the transverse plate is in sliding fit with a mounting plate, a plurality of elastic probes are mounted on the mounting plate, and each elastic probe comprises a fixed section and a pointed-cone-shaped movable section. During cleaning, the cleaning plate can be driven to be far away from the mounting plate, the driving mechanism synchronously drives the movable plates to be close to each other, and finally the driving part synchronously drives the movable section to rotate, so that the surface oxide layer of the test probe can be cleaned on the premise of not dismounting the test probe, and the test probe cleaning device is relatively convenient and easy to use.

The invention discloses a laser cleaning method for a magnesium-based foil, and belongs to the technical field of magnesium ion battery manufacturing. According to the laser cleaning method for the magnesium-based foil, the magnesium-based foil is magnesium foil or magnesium alloy foil, and the method comprises the following steps that laser cleaning is conducted on the magnesium-based foil through a laser device, and a laser beam conducts 45-degree cross filling path scanning on the surface of the magnesium-based foil; monitoring a plasma spectral line of laser ablation in real time by using a plasma spectrometer; based on the dynamic change of the magnesium characteristic plasma spectral line intensity, the cleaning parameters of the laser are adjusted; and after cleaning is completed, an oxide layer on the surface of the magnesium-based foil is removed. 45-degree cross filling path scanning is adopted, heat accumulation of a repeated scanning area can be reduced, during 45-degree cross filling, adjacent scanning lines cover in a cross mode, heat distribution is more uniform, heat of the scanning area can be reduced, and therefore the problems of local overheating and negative plate perforation or structural damage caused by too high energy are avoided.

The invention discloses a high-temperature wear-resistant crack-free high-entropy alloy and a preparation method and application thereof, the molecular formula of the alloy is as follows: Fe < 11.9 > Co < 23.8 > Cr < 23.8 > Ni < 35.7 > Nb < 4.8 >, and a Laves phase exists in the microstructure of the alloy. The preparation method comprises the following steps: putting weighed powder into a ball milling tank for ball milling, uniformly mixing the powder, and then drying, sieving and drying for storage; 304L stainless steel is selected as a base material, a sand mill is used for polishing the surface of the base material so as to remove surface oxide skin until a bright surface is exposed, and oil stains on the surface are cleaned; and the dried powder is placed in a powder feeding tank in a laser system, high-purity Ar gas is used for feeding the powder to a round spot laser head for melting and stacking, and the high-temperature wear-resistant crack-free high-entropy alloy without cracks is formed through layer-by-layer continuous deposition. By adding the Nb element, a Laves phase capable of improving the high-temperature performance is formed in a matrix, a high-entropy alloy sample is prepared through the laser directional energy deposition technology, subsequent heat treatment does not need to be conducted on the high-entropy alloy sample, and the deposited alloy has the excellent wear resistance at the high temperature.

The invention relates to the technical field of industrial visual inspection, and particularly discloses a cable copper wire surface oxidation defect online detection system, which is characterized in that multispectral pixel blocks on the surface of a copper wire are extracted through multispectral imaging and image segmentation; using a lightweight convolutional neural network to extract deep spectral-spatial features to obtain an initial feature vector; decomposing the initial feature vector into a defect essential feature component and an environment related feature component which are independent from each other by adopting a feature decoupler; applying a composite loss function including classification loss, decoupling loss and orthogonal constraint loss in the training stage for joint optimization; in the inference stage, classification decision is carried out only according to the intrinsic characteristic components of the defects, and a sorting mechanism is linked to execute rejection operation.

The invention relates to the technical field of laser processing, and discloses a method and system for online removal of steel wire rod oxide scale based on the laser technology, and the method comprises the following steps: establishing a relationship between a release stress and an adhesive force, and determining a relationship between different process parameters and oxide scale removal effects; initial laser process parameters are determined by combining the current material attributes of the wire rod and the performance of the oxide skin; the initial laser process parameters are dynamically adjusted according to the thickness distribution condition of the oxidation layer on the surface of the wire rod; performing laser treatment on the oxide scale on the surface of the wire rod by using a rotary laser head; and detecting the removal effect of the scale on the surface of the wire rod by using an image recognition technology, and dynamically optimizing model parameters according to a detection result. The device can remove scale and stains on the surface of the wire rod in the continuous production process at a time, and the problems that in the prior art, the scale on the surface of the wire rod cannot be completely removed, and the scale on the surface of a workpiece cannot be efficiently treated online are solved.

The invention relates to welding wire machining equipment and a welding wire machining method. Comprising a bottom plate, a discharging assembly and a receiving assembly which are arranged on the bottom plate, a processing cavity formed in the bottom plate and located between the discharging assembly and the receiving assembly, and a placing plate arranged on the bottom plate and located between the processing cavity and the receiving assembly. The cold drawing assembly is arranged on the bottom plate and located between the collecting assembly and the processing cavity, the feeding hole and the discharging hole are formed in the front side and the rear side of the processing cavity respectively and used for allowing welding wires to enter and exit, and a spraying assembly is arranged on the processing cavity. According to the device, after stretching out of the discharging assembly, a to-be-machined welding wire enters the treatment cavity, the spraying assembly sprays an acid pickling solution for acid pickling, surface oxide skin and stains are removed, then the to-be-machined welding wire enters the impurity removing assembly on the containing plate, the surface of the welding wire is polished, surface impurities of the welding wire are removed, and then the welding wire enters the cold drawing assembly for cold drawing and wire drawing; and finally, the machined welding wires are collected through the material collecting assembly.

The invention provides an integral forming method and device for a pressure accumulator diaphragm capsule, and the method comprises the following steps: sleeving a movable female die into a pipe blank part, and adjusting the distance between the movable female die and a fixed female die; a high-pressure fluid medium is introduced through an internal flow channel of the connecting rod, and the pressure and loading time of the high-pressure medium are regulated by a pressure regulating device; the positions of the movable core head, the fixed sealing head, the pre-expansion limiting die and the movable female die are kept immovable, and the pressure regulation and control device is adjusted to unload the pressure of the high-pressure medium; the pre-expansion limiting die is separated in the radial direction and rotates to be separated from the pipe blank part; the movable female die moves in the axial direction to form a single waveform; the movable female die moves progressively in the axial direction, and the movable core head moves in the axial direction as well; and forming of a second waveform and a subsequent waveform is completed. According to the method, the defects of welding deformation, weld joint gouges, weld joint surface oxidation color, weld joint black spots and joint internal oxide inclusion caused by a traditional welding method are overcome, the quality control difficulty in the production process is reduced, and the production efficiency and the production quality of the diaphragm capsule are remarkably improved.

The tin wire surface oxide layer removing device comprises a machine shell and two rotating columns, the two rotating columns are rotationally installed in the machine shell, a first motor is fixedly installed at one end of the machine shell, the outer surface of an output shaft of the first motor is sleeved with a first transmission belt, and the other end of the first transmission belt is arranged on the outer surface of a first transmission wheel in a sleeving mode; the first transmission wheel is fixedly installed on the outer surface of one set of rotating columns, the other ends of the two sets of rotating columns rotationally penetrate out of the other end of the machine shell, a grinding disc is fixedly installed on the outer surfaces, rotationally penetrating out, of the rotating columns, and pushing and unfolding mechanisms are oppositely rotationally installed at the two ends of the machine shell. Traction mechanisms are fixedly mounted on the upper surface of one of the two groups of pushing and unfolding mechanisms and the lower surface of the other group of pushing and unfolding mechanisms. Through the design of the pushing and unfolding mechanism and the traction mechanism, the polishing stroke of the tin wire by the polishing disc can be shortened or increased, so that the device can adapt to tin wires with different oxidation degrees, and it is ensured that an oxidation layer is thoroughly removed.

This invention provides a method for producing small-diameter, thick-walled near-α-type titanium alloy tubing and its application. This method, through the use of cladding and heated rolling, increases the deformation per rolling pass, reduces the number of rolling passes, and results in a finer microstructure and better mechanical properties in the heated-rolled tubing. Simultaneously, the composite material composed of the cladding layer and silica aerogel effectively prevents the alloy rod from contacting air, avoiding further surface oxidation and reducing the thickness of the oxide layer on the rod surface. Furthermore, the composite material forms a "thermal insulation layer" on the surface of the alloy rod, preventing large temperature differences between the surface and core during heated rolling, thus ensuring better microstructure uniformity and surface quality. In this invention, the cladding process expands the selection of heating furnaces and reduces equipment requirements.

The invention provides a preparation method of a gate structure and a pHEMT device. The preparation method comprises the following steps: forming a first photoresist layer with a first opening on a substrate; etching the substrate along the first opening to form a trapezoidal groove of which the bottom width is greater than the width of the first opening; a first metal layer and a dielectric layer are formed, the first metal layer covers part of the bottom wall of the trapezoidal groove under the first opening, and the dielectric layer covers the area, not covered by the first metal layer, of the trapezoidal groove; forming a second photoresist layer with a second opening, wherein the second opening and the first opening are communicated to form a T-shaped window; and a second metal layer is formed in the T-shaped window, and the second metal layer and the first metal layer jointly form a gate structure. Before the photoresist layer is removed, the dielectric layer is deposited to protect the exposed substrate, so that the surface of the exposed substrate can be prevented from being oxidized, the problem of electric leakage or short circuit of a device caused by the fact that metal chips fall on the surface of the substrate is solved, and the damage of a subsequent cleaning process to an etching groove can be reduced.

The invention discloses an ultrathin aluminum foil material for energy storage and a preparation method thereof, the alloy components of the aluminum foil material comprise Al, 0.2%-0.5% of Mn, 0.1%-0.3% of Mg and 0.1%-0.2% of Si, the thickness of the aluminum foil is 5-10 [mu] m, and the surface of the aluminum foil is coated with an oxidation film with the thickness of 20-50 nm. The material has excellent mechanical properties, conductivity and corrosion resistance. The preparation method comprises the steps of smelting and casting, hot rolling, cold rolling, heat treatment, surface treatment, finished product processing and the like, the smelting temperature, the cold rolling compression ratio, the annealing process and surface oxidation treatment parameters are optimized in detail, and the comprehensive performance of the aluminum foil is remarkably improved. Compared with the prior art, the ultrathin aluminum foil is realized, the mechanical strength and the conductivity are both considered, and the corrosion resistance is improved. The prepared aluminum foil material is suitable for energy storage devices such as lithium ion batteries and supercapacitors, meets the requirements for high energy density and light weight, and has excellent industrial application prospects.

The invention belongs to the technical field of metal powder material preparation, and relates to a preparation method of high-performance copper powder with high laser absorptivity and a 3D printing method.The preparation method comprises the following steps that firstly, spherical copper powder, nano ceramic particles and an auxiliary reagent are mixed to obtain mixed powder; 2, putting the mixed powder obtained in the step 1 into a grinding tank, and uniformly grinding and mixing through an acoustic resonance mixer; and 3, the mixed powder obtained after uniform grinding and mixing is placed in a vacuum drying box to be subjected to heat treatment, and the high-performance copper powder with the high laser absorptivity can be obtained after treatment is completed. According to the characteristics of the laser 3D printing technology, the nano ceramic particles are added into the spherical copper powder, the laser absorptivity is effectively improved, and the added auxiliary reagent has the effects of removing an oxidation film on the surface of the copper powder and improving the wettability of the copper powder and the nano particles in the printing process; meanwhile, the nano ceramic particles are used as a reinforcing phase, so that the mechanical property of the pure copper can be effectively improved.

The invention discloses a method for preparing a non-polymer coating of a pure magnesium intravascular stent, and relates to the technical field of medical instruments, and the method comprises the following steps: pretreatment: immersing the pure magnesium intravascular stent into a diluted hydrochloric acid solution for ultrasonic cleaning, removing a surface oxidation film and impurities, then washing the pure magnesium intravascular stent with deionized water until the pure magnesium intravascular stent is neutral, and drying the pure magnesium intravascular stent for later use; micro-arc oxidation: taking the pretreated bracket as an anode, taking a stainless steel plate as a cathode, putting the bracket and the stainless steel plate in electrolyte, applying pulse voltage for treatment, and generating a ceramic oxide layer with the thickness of 5-20 microns on the surface of the bracket; and bioactive coating: immersing the stent subjected to micro-arc oxidation into the suspension, and depositing by adopting an electrophoretic deposition method to form a hydroxyapatite coating with the thickness of 1-5 microns. According to the non-polymer coating method for the pure magnesium intravascular stent, no polymer is used in the whole coating process, inflammatory reaction possibly caused by the polymer and degradation products of the polymer is avoided, and the biological safety of the stent is improved.

The invention discloses a chemically enhanced shear thickening polishing solution suitable for a WC-Co alloy and a polishing method, and aims to solve the problem of loss of a Co phase on the surface of the WC-Co alloy in a traditional polishing method. The polishing solution comprises K3 [Fe (CN) 6], KOH, diamond abrasive particles, dispersed phase particles and deionized water, a WC phase and a Co phase of a WC-Co alloy react with [Fe (CN) 6] 3 <-> and OH <-> in the polishing solution respectively, and a soft oxidation film WO3-x and a stable Co3O4 oxidation film are generated on the surface of the alloy. Through the shear thickening effect, the polishing solution forms a particle cluster wrapping the abrasive particles when the relative speed reaches a threshold value, a surface oxidation film is removed through the micro-cutting effect of the diamond abrasive particles, and efficient, high-quality and Co-loss-free WC-Co alloy surface polishing is achieved. The method obviously inhibits the loss of the Co phase at the same time, maintains the hardness and the use performance of the alloy surface, and is especially suitable for precision machining of the hard alloy blade.

The invention provides an automatic production line for collaborative operation of continuous vacuum laser deep penetration welding and workpiece surface oxidation pretreatment, and relates to the technical field of laser welding, the automatic production line comprises a grinding box, a laser processing box is arranged on one side of the grinding box, and inlets and outlets are formed in the two sides of the grinding box and the two sides of the laser processing box; a connecting channel is fixed to an inlet and outlet between the grinding box and the laser processing box, a sending-out channel is fixed to an inlet and outlet in the outer side of the laser processing box, and compared with the prior art, the grinding box communicates with the laser processing box through the connecting channel, and an extending-out plate and a containing plate for clamping plates are arranged in the connecting channel and the sending-out channel; the clamping distance suitable for plates can be adjusted through the conveying assembly, the plates are driven to be intermittently fed into the grinding box and the laser machining box in a clamping traction mode, air in the laser machining box is pumped out in cooperation with the air storage cylinder, the relative vacuum environment is kept, the effect of laser deep penetration welding is prevented from being affected, assembly line machining is achieved, and efficiency is higher.

The invention discloses a method for reducing impurity element sulfur in cast high-temperature alloy return scraps, and belongs to the technical field of metal material smelting. The method comprises the following steps: carrying out vacuum induction melting on pretreated cast high-temperature alloy return scraps of the same mark to obtain a return scrap alloy induction ingot; surface oxide skin of the obtained return scrap alloy induction ingot is removed, a primary shrinkage cavity in the upper end is cut off, then the return scrap alloy induction ingot and an auxiliary electrode are coaxially welded, and a consumable electrode is obtained; and after the consumable electrode is baked, electroslag remelting is conducted under the protective atmosphere, and an electroslag ingot is obtained. On the basis of vacuum induction melting, the protective atmosphere electroslag remelting technology is further adopted for conducting deep purification melting treatment on the return scrap alloy ingot, the content of the impurity element S in the return scrap alloy ingot can be reduced to 0.5 ppm or below, and the content of the impurity element S in the return scrap alloy ingot reaches the level lower than the content of the element S in a new material; and the high-temperature oxidation resistance and corrosion resistance of the alloy can be obviously improved, and the fatigue, durability and other mechanical properties of the alloy are improved.