366 results about "Surface oxide" patented technology

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 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 relates to the technical field of powder metallurgy materials, and discloses rare earth microalloyed ultrahigh-strength high-toughness hot work die steel and a preparation method thereof.The die steel is prepared from 4Cr5MoSiV1 pre-alloyed powder, rare earth hydride, boron carbide and porous amorphous carbon powder loaded with a nickel catalyst. The preparation method comprises the steps of material mixing, sheath packaging, graded dynamic reaction thermal devolatilization, hot isostatic pressing densification and heat treatment, in the graded dynamic reaction thermal devolatilization, active hydrogen generated by decomposition of rare earth hydride is used for reducing oxide on the surface of powder, and nickel catalyzed carbon powder is used for capturing water vapor at low temperature to generate CO to be discharged. An oxide film on the surface of the powder is thoroughly removed through in-situ chemical reaction, original particle boundaries are eliminated, meanwhile, a nano strengthening phase with high thermal stability is generated in situ, and the high-temperature strength, impact toughness and tissue compactness of the die steel are remarkably improved.

The invention discloses a high-heat-conductivity leakproof liquid metal phase change heat-conducting gasket and a preparation method thereof, and relates to the technical field of heat-conducting gaskets. The preparation method comprises the following steps: alloying high-heat-conductivity low-melting-point liquid metal gallium with high-heat-conductivity metal silver and copper, mixing with a polymer containing a specific functional group, adding a modified heat-conducting filler, and carrying out UV curing to form the heat-conducting gasket. Liquid metal is easily alloyed to form eutectic alloy, the melting point can be increased, a chemical cross-linked network formed by the modified heat conduction filler and UV curing can make up heat conduction loss, a heat conduction path is established, the interface thermal resistance is reduced, and the heat conduction efficiency is remarkably improved. The surface oxide layer interacts with the polar group of the polymer, and the steric hindrance effect of the cross-linked network is combined to synergistically realize the leak-proof effect. The high-heat-conductivity leakproof liquid metal phase change heat-conducting gasket prepared by the invention has the effects of high heat conductivity and leakproof.

The invention discloses a copper wire tinning method for tinned copper stranded wire production, which relates to the technical field of metal surface treatment, and comprises the following steps: releasing a copper wire to an ionic liquid electrophoresis tank, applying an electric field to strip surface oxides, and then carrying out three-stage countercurrent rinsing to generate a clean copper wire; putting the clean copper wire into a composite plating tank, monitoring the tin liquid viscosity and the copper wire linear speed in real time, calculating the magnetic field gradient, and controlling tin crystal oriented growth according to the magnetic field gradient to generate an oriented crystallization tinned copper wire; the surface temperature of the directionally crystallized tinned copper wire is monitored in real time and compared with a preset temperature threshold value, a temperature permission trigger signal is generated, the annular array spray gun is triggered to work according to the temperature permission trigger signal, and a densified tinned copper wire is generated; and the densified tinned copper wire is scanned through a micro-focus CT scanner, a gap three-dimensional point cloud picture is generated, the gap size and the normal angle of the gap three-dimensional point cloud picture are analyzed, the optimal spraying parameters are recognized, and the passivation film tinned copper wire is generated.

The invention provides improved techniques for bonding devices using copper-to-copper or other types of bonds. A substrate is cleaned to remove surface oxides and contaminants and then rinsed. The rinsed substrate is provided to coating unit where a protective coating is applied to the substrate. The protective coating may be applied by immersing the substrate in a bath or via chemical vapor deposition. In an aspect, the protective coating may be copper selective so that the protective coating is only applied to copper features of the substrate. The protective coating minimizes formation of oxides and other bond weakening forces that may form during bonding processes, such as bonding a copper wire to a copper bond pad of the substrate. In an aspect, an annealing process is used to cure the protective coating and remove small imperfections and other abnormalities in the protective coating prior to the bonding process.

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.

The invention discloses a method for recycling high-value components of a solder strip in a decommissioned crystalline silicon photovoltaic module, belongs to the field of decommissioned photovoltaic material treatment and resource recycling, and the novel method for recycling the solder strip is efficient and has large-scale application potential. The recovery method comprises the steps that firstly, the surface of the welding strip is cleaned through alkali solution pretreatment, then a lead-tin coating on the surface of the welding strip is oxidized through a method of heat treatment in air, then the welding strip is soaked in an acid solution to remove surface oxides, then recovered solid products are washed with water and dried, and high-value components in the waste welding strip can be obtained. And further purifying and recycling. The method solves the problems of tedious operation method, low efficiency and the like during treatment of a traditional method. And meanwhile, the recovery route has a simple and convenient operation process, has large-scale application potential, and provides a large-scale application technical route and feasibility for recovery of the welding strip in the waste crystalline silicon photovoltaic module.

The invention discloses a preparation method of a corrosion-resistant and impact-resistant high manganese steel wear-resistant lining plate, and relates to the technical field of wear-resistant materials, the preparation method comprises the following steps: S1, weighing raw materials according to the mass percentage; s2, raw material smelting; s3, rare earth purification is conducted, specifically, rare earth elements are added into the molten-state raw materials, and the molten-state raw materials are subjected to deoxidation and desulfurization treatment; s4, casting molding is conducted, the temperature from the bottom end of a casting to a riser is controlled to be decreased stage by stage, and directional solidification is achieved; s5, heat treatment is conducted, specifically, the casting is subjected to solution treatment and then subjected to water quenching to the room temperature; and S6, surface treatment is conducted, specifically, shot blasting treatment is adopted, surface oxide skin is removed, and a surface compressive stress layer is formed. The strength, hardness and high toughness of the high-manganese steel are guaranteed by controlling the content of carbon and manganese, meanwhile, single-phase austenite is obtained through solution treatment, the hardness is improved through carbon atom segregation through low-temperature aging, and the strength, hardness, toughness and corrosion resistance of the high-manganese steel lining plate are improved.

The invention relates to the field of solar cell manufacturing, and particularly discloses a polishing additive for solving the black core problem in the BC cell pre-rough polishing process and a use method of the polishing additive. 0.1-5% of a defoaming agent; 0.1 to 0.5 percent of pH (Potential of Hydrogen) regulator; and the balance of deionized water. According to the method, the accelerant, the defoaming agent and the pH regulator in a specific ratio are combined, so that the oxidation reaction on the surface of the silicon wafer is more uniform and controllable; the accelerant accelerates formation and dissolution of a surface oxide layer, and generation of black cores is effectively avoided; the synergistic effect of the defoaming agent ensures that bubbles generated by the reaction can be quickly desorbed, the problem of uneven local corrosion caused by bubble retention is prevented, the surface of the polished silicon wafer is completely free of black nuclei, and ideal surface conditions are provided for subsequent processes.

The invention relates to a low-cost high-strength corrosion-resistant magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by mass: 6-11% of Al, 0.4-0.6% of Zn, 0.2-0.6% of Mn, 0.2-0.4% of Y, 0.2-0.6% of Ca and the balance of Mg and inevitable impurities. A small amount of Ca and Y elements are added, on one hand, an alpha-Mg matrix structure can be refined, beta phase distribution is more uniform, and the mechanical property is improved; and on the other hand, the solid solubility of the alloy element Y in an alpha-Mg matrix can be improved by adding the Ca element, the compactness of a surface oxidation film and a corrosion product film is promoted, compared with other rare earth elements, the potential difference between Al-Ca and Al-Y phases formed by Ca, Y and Al and the magnesium matrix is smaller, micro galvanic corrosion is smaller, and the corrosion resistance of the alloy is remarkably improved.

The invention relates to a preparation method of a high-hardness composite coating on a titanium alloy surface, which comprises the following steps: pretreating a titanium alloy base material to remove a surface oxide layer to obtain the treated titanium alloy base material; prepared high-entropy alloy powder is dried and evenly laid on the surface of the treated titanium alloy base material, and the titanium alloy base material with the powder laid is obtained; performing laser cladding treatment on the titanium alloy base material subjected to powder laying in a protective gas atmosphere to obtain a high-entropy alloy strengthened coating; the particle size of the powder is controlled to be 65-90 microns. The Al powder, the Co powder, the Ni powder, the Ti powder and the B powder with the purity higher than 99.5 wt% are selected as raw materials, the high-entropy alloy powder and the high-strength titanium alloy matrix are molten on the surface of the high-strength titanium alloy through a laser high-energy heat source, the metallurgical bonding effect is achieved, high-entropy phase strengthening is achieved, grains can be fine, and the hardness and abrasion resistance of a surface coating can be improved. The surface hardness of the coating prepared by laser cladding of the high-entropy alloy powder on the surface of the titanium alloy is not lower than 677 HV, and the wear resistance is not lower than 1.128 hmm.

The invention discloses a surface cleaning method for a large complex magnesium alloy structural part formed through electric arc additive manufacturing, and belongs to the field of post-treatment of formed structural parts after electric arc additive manufacturing. The method comprises the following steps that a mechanical arm is adopted to drive a special wire brush to conduct preliminary mechanical cleaning, and flexible contact is achieved through a mechanical sensor and a floating clamp; acidic cleaning liquid is sprayed to the surface of the workpiece through an ultrasonic spraying system, the surface color change is monitored in real time through a high-speed camera so as to control the reaction endpoint, and flushing and drying are conducted in time; and finally, carrying out fine cleaning under the protection of argon by adopting large-light-spot laser with low power density, and monitoring in real time through a spectrograph to ensure the cleaning effect. According to the method, the oxide layer and the pollutants on the surface of the large complex component can be efficiently, losslessly and automatically removed, the problem that the magnesium alloy WAAM component is difficult to clean due to high chemical activity and complex structure is solved, and the whole process is environmentally friendly and controllable.

A high-entropy nano-array for electrocatalytic nitrate reduction coupling waste plastic conversion is prepared by the following method: (1) immerse the nickel foam into a hydrochloric acid solution to remove the surface oxide layer and oil stains, rinse with deionized water / ethanol three times, and dry for subsequent use; (2) solid powders of sodium chloropalladate, platinum acetylacetate, nickel chloride hexahydrate, copper chloride dihydrate, silver trifluoroacetate and tungsten hexacarbonyl are poured into an N-N dimethylformamide solution, ultrasonic is used to dissolve the solid powders, then glacial acetic acid and the treated nickel foam are added to the above solution, and after ultrasonic, heating in an oven is carried out, after the reaction is completed, water and ethanol solution are used for alternate washing, and drying is carried out, and the high-entropy nano-array catalyst is obtained. A preparation method of a high-entropy nano-array for electrocatalytic nitrate reduction coupling waste plastic conversion is provided. The high-entropy nano-array has excellent electrocatalytic activity and stability.

The invention discloses a composite spraying film material for heat dissipation of an air conditioner outdoor unit. The composite spraying film material comprises a first complexing agent and a second complexing agent, according to the air compressor, the first complexing agent and the second complexing agent are cooperatively matched, the first complexing agent can form a rough material layer on the surface of the air compressor to serve as a bottom film layer, the rough surface is composed of countless randomly-distributed tiny concave-convex structures, the effective radiation area is increased through the concave-convex structures, and then the radiation efficiency is effectively improved; furthermore, a surface film layer is formed on the bottom film layer through a second complexing agent, the surface film layer is coated on the concave-convex structures in the bottom film layer, so that the radiation heat dissipation of each concave-convex structure in each direction is further improved, and the surface film layer and the bottom film layer jointly assist the heat dissipation of the surface oxide layer of the air compressor. The heat generated by working of the air compressor can be quickly dissipated, so that the temperature of the air compressor is kept in the optimal working temperature range, and finally, the refrigerating or heating effect can be close to the preset temperature.

The invention discloses a high-temperature alloy turbine blade directional solidification method based on multistage dynamic gas protection control. The high-temperature alloy turbine blade directional solidification method comprises the following steps that a high-temperature alloy mother alloy material is put into a crucible; filling inert gas to a preset pressure, heating the crucible, heating to a preset temperature, and keeping the temperature to ensure that the alloy liquid is liquefied; continuously filling inert gas to preset pressure and then refining, wherein a vibration generator generates a magnetic field in the refining process to carry out electromagnetic vibration on the alloy liquid; continuously filling inert gas to preset pressure, and then transferring the crucible; inert gas is continuously filled to preset pressure, then the crucible is tilted, pouring is conducted, and in the pouring process, a gas purging device sprays the inert gas to conduct purging protection on the alloy liquid; and continuously filling inert gas to preset pressure, and pulling the shell to finish the directional solidification process. The method can reduce the gas content in the melt, prevent the melt from being oxidized, promote the removal of a surface oxidation film, reduce pores and oxidation film inclusion, and improve the purity, mechanical properties and yield of the casting.

The application discloses a high-carbon ferromanganese iron powder remelting process, which comprises the following steps: step one, pickling: high-carbon ferromanganese iron powder is subjected to pickling under the action of a pickling solution, so that a surface oxide layer is removed, and deoxidized ferromanganese iron powder is obtained; and step two, ultrasonic cleaning: the deoxidized ferromanganese iron powder obtained in step one is added into an ultrasonic cleaning machine for cleaning, so that surface stains and grease are removed. After preheating and degassing, nitrogen and oxygen of the ferromanganese sintered block are detected, and ingredients are prepared according to the nitrogen content, so that the ingredient amount is more reasonable, and the quality of the high-carbon ferromanganese alloy is improved. Moreover, the deoxidized skin of the high-carbon ferromanganese iron powder is removed outside the furnace, so that the deoxidized skin does not need to be removed by using a lossy reagent covering agent in the furnace, the alloy is less damaged, and the ferromanganese burning loss is reduced. As a result, the formed manganese oxide slag is less, the quality of the high-carbon ferromanganese finished product is greatly improved based on the above two points, the chemical composition of the high-carbon ferromanganese finished product is uniform, and the prepared high-carbon ferromanganese alloy has higher hardness and toughness.

The application discloses a nickel-plated steel strip lead processing method and belongs to the technical field of metal material surface treatment. The method aims to solve the problems of poor plating layer adhesion, large internal stress and easy peeling of the existing nickel-plated steel strip lead. The process steps include: S1, steel strip oil removal treatment; S2, composite activation treatment: the oil-removed steel strip is immersed in a composite activation solution containing sodium citrate to remove the surface oxide layer and form an active adsorption film; S3, nickel plating: the activated steel strip is immersed in a sulfate plating solution containing saccharin and 1,4-butynediol as composite additives for electroplating to form a low-stress and high-density nickel plating layer; S4, post-treatment: cleaning and drying; S5, slitting and packaging. The application cooperates sodium citrate activation with a plating solution system containing stress relieving agents, significantly improves the adhesion between the substrate and the plating layer, reduces the internal stress of the plating layer, and the obtained product has no peeling and falling of the plating layer after repeated bending, low porosity and excellent comprehensive performance, and is particularly suitable for the manufacturing of high-performance electronic component leads.

The casting surface oxide skin laser cleaning machine comprises a working plate, a positioning gear ring is connected to the position, close to the outer arc wall, of the top of the working plate through bolts, a positioning assembly is connected to the center of the top of the working plate through bolts, and a laser cleaning mechanism is connected to the inner wall of the positioning gear ring in an engaged mode. And the laser cleaning mechanism does circular motion around the positioning assembly on the positioning gear ring so as to carry out laser cleaning on the oxide skin on the surface of the casting. The laser cleaning mechanism is arranged, so that a laser generator can be adjusted in the vertical direction in the circumferential direction, castings can be comprehensively cleaned and machined, the positioning assembly is arranged, the castings with different sizes can be clamped and fixed, and the machining efficiency is improved. And therefore, comprehensive laser cleaning can be conveniently carried out on the surface, and the whole surface treatment efficiency is improved.

The utility model discloses a vacuum coating machine workpiece surface pretreatment device, including the cleaning shell, the top one end of cleaning shell is equipped with the fixing frame, and the top center of fixing frame is below the bottom is equipped with the first cleaning subassembly for the physical cleaning pretreatment of milling cutter workpiece surface, the utility model discloses a set of double -cleaning pretreatment device of collaborative operation is constructed through the synergistic effect of fixed frame, second electric telescopic handle, mounting seat, cleaning brush and water pump, water suction pipe, cleaning fluid tank, flexible hose, pipeline joint, installation pipe, high pressure spray head etc. The device carries out physical brushing to the complex structure such as spiral groove on milling cutter workpiece through the cleaning brush of second electric telescopic handle drive, and the chemical flushing of cooperating high pressure spray head injection cleaning fluid simultaneously, and the synergistic effect of both not only effectively removes the cutting fluid residue and metal scrap of traditional method difficult to handle, can remove surface oxide layer and micro -contaminant more in depth.

This invention provides a method for improving the microstructure and corrosion uniformity of low-temperature extruded magnesium alloys, belonging to the field of magnesium alloy preparation and processing. The method includes the following steps: S1: Cutting a low-alloy element content magnesium alloy ingot and removing the surface oxide layer to obtain a cast sample; S2: Performing pulsed current homogenization treatment on the cast sample; S3: Removing the surface oxide layer from the homogenized alloy to process it into an extrusion billet; S4: Performing low-temperature extrusion treatment on the extrusion billet under pulsed current assistance. This invention improves the microstructure and corrosion uniformity of low-temperature extruded magnesium alloys while ensuring high strength and plasticity, and is suitable for the efficient and energy-saving preparation of biodegradable magnesium alloy extruded bars and sheets.

The invention provides a preparation method of a fast-charging aluminum negative electrode material based on stepped temperature lithiation, which comprises the following steps: (S1) placing an aluminum foil with a surface oxide layer removed in a first lithiation reagent, and forming a LiAl phase on the surface of the aluminum foil under a low-temperature condition to obtain a first pre-lithiated aluminum foil; (S2) putting the aluminum foil subjected to primary pre-lithiation into a second lithiation reagent, and partially converting a LiAl phase into a lithium-aluminum alloy phase with higher lithium content under a high-temperature condition, so as to obtain aluminum foil subjected to secondary pre-lithiation; and (S3) washing and drying the aluminum foil subjected to secondary pre-lithiation to obtain the fast-charging aluminum negative electrode material. According to the invention, a lithiation process of first low temperature and then high temperature in steps is adopted, so that controllable and stable construction of the gradient alloy layer is realized, and the interfacial ion transport kinetics and fast charge performance of the aluminum negative electrode are remarkably improved.

The invention discloses a rare earth-nickel-based AB2 type hydrogen storage alloy material and a preparation method thereof, and relates to the field of solid hydrogen storage materials, the alloy comprises rare earth elements La, Ce and Sc and transition metals Ni, Mn, Al and Zr according to a specific proportion, the raw materials are melted through electric arc melting and are subjected to alloying reaction to form a master alloy ingot, and the master alloy ingot is subjected to high-temperature sintering to obtain the rare earth-nickel-based AB2 type hydrogen storage alloy material. Non-equilibrium solidification is achieved through single-roller rapid quenching, a thin strip of a metastable-state structure is obtained, grain arrangement and second-phase precipitation are regulated and controlled through gradient annealing, finally, a surface oxide layer is removed through crushing and acid etching, and hydrogen storage alloy powder is obtained through vacuum drying. An AB2 type Laves phase main body structure is formed through multi-element rare earth solid solution, grain coarsening is inhibited by combining a rapid quenching process, a microstructure is optimized through gradient annealing, the hydrogen storage capacity, hydrogen absorption dynamic performance and cycling stability of the alloy are synergistically improved, and the alloy is suitable for preparation and application of an efficient hydrogen storage material.

A method for fabricating a capacitor is provided. The method includes following steps. A mold is formed on an interconnect layer. A recess is formed in the mold. A bottom electrode layer is deposited on the mold and into the recess. A metal oxide layer is disposed on the bottom electrode layer and into the recess. A surface oxide layer is formed on the metal oxide layer. A non-O2 wet etching process is performed to remove the surface oxide layer, the metal oxide layer, and the mold from the bottom electrode layer.

The invention discloses a composite precipitation strengthened ultrahigh-strength invar steel wire and a preparation method thereof. The composite precipitation strengthened ultrahigh-strength invar steel wire comprises the following chemical components in percentage by mass: 0.21%-0.25% of C, 36.5%-38.5% of Ni, 0.7%-1.3% of Mo, 0.3%-0.6% of V, 0.8%-1.2% of Nb, 1.2%-1.6% of Ti and the balance of Fe and inevitable impurities. A steel ingot is prepared through the working procedures of an electric furnace, an LF furnace, a VD furnace and an electroslag furnace, and then the steel ingot is forged into a square billet; then the square billet is hot-rolled into a steel wire rod with the diameter being 13-15 mm; the wire rod is subjected to solid solution heat treatment and then water-cooled to the room temperature, and surface oxide skin is removed; the wire rod is subjected to cold drawing to form a wire rod with the diameter being 4.5-6.0 mm; carrying out aging heat treatment on the cold-drawn wire; and finally, the wire subjected to aging heat treatment is cold-drawn again to form a wire with the diameter phi of 1.5-3.5 mm. By controlling the production process of the whole process and parameters of key nodes, the ultrahigh-strength invar steel wire material with the tensile strength larger than or equal to 1750 MPa, the thermal expansion coefficient smaller than or equal to 2.7 * 10 <-6 > / DEG C at the room temperature to 230 DEG C and the thermal expansion coefficient smaller than or equal to 9.8 * 10 <-6 > DEG C at the 230-290 DEG C is obtained.

The invention provides a direct liquid cooling power chip structure and a manufacturing method thereof, and belongs to the technical field of semiconductor packaging, and the method comprises the following steps: carrying out the surface pretreatment of a metal layer of a packaging substrate, so as to remove surface oxides and organic pollutants; processing a micro-channel structure in the metal layer; and electrically and thermally interconnecting a bottom bonding pad of the power chip with the surface of the metal layer, and covering the power chip on one side of the micro-channel structure to form a sealing cover plate. According to the method, the micro-channel structure is directly processed and formed in the metal layer of the packaging substrate, and the power chip covers one side of the micro-channel structure to form the sealing cover plate, so that the cooling liquid can flow close to the bottom of the power chip, heat generated by the power chip can be more efficiently led out, and the heat dissipation efficiency of the power chip is improved. A heat dissipation path is obviously shortened, interface thermal resistance is reduced, and heat exchange efficiency is improved; the device is compact in overall structure, the integration level is remarkably improved, and the requirements of high power density and miniaturized packaging are met.

The invention discloses an engine impeller surface strengthening process. The engine impeller surface strengthening process comprises the following steps that S1, the surface of an engine impeller is polished through coarse abrasive cloth to remove a surface oxide layer; s2, the engine impeller obtained after the step S1 is washed, and surface moisture is dried; s3, the engine impeller obtained after the step S2 is subjected to sand blasting treatment, and the sand blasting treatment time is 2-5 min; s4, the engine impeller obtained in the step S3 is placed in a strengthening furnace to be subjected to high-temperature flame calcination, and air cooling is conducted for 4-6 h after calcination; s5, the surface of the engine impeller obtained in the step S4 is coated with a strengthened coating material, and the strengthened coating material comprises 10%-18% of tungsten carbide particles, 8%-12% of a nickel-based adhesive and the balance ethyl silicate hydrolysate; s6, the engine impeller obtained in the step S5 is placed in a treatment furnace to be subjected to heat treatment; and S7, the engine impeller obtained after the step S6 is ground and polished.

The utility model relates to the technical field of power cables, and discloses a waterproof insulating layer composite structure of a power cable, which comprises a conductor, an insulating layer arranged on the periphery of the conductor, an anti-interference layer arranged on the periphery of the insulating layer, a waterproof layer arranged on the periphery of the anti-interference layer, a flame-retardant layer arranged on the periphery of the waterproof layer, and a waterproof layer arranged on the periphery of the flame-retardant layer. And a shielding layer is arranged at the periphery of the flame-retardant layer. According to the waterproof insulating layer composite structure of the power cable, the insulating layer is made of cross-linked polyethylene, so that the conductor can be effectively isolated from the external environment, electric leakage is prevented, the waterproof insulating layer composite structure has the advantages of high toughness and high impact strength, the anti-interference layer made of aluminum foil has ductility and adapts to cable bending, and a surface oxidation film is resistant to acid and alkali; and the shielding layer made of the copper wire woven mesh has electromagnetic shielding and physical protection functions when being compounded with the anti-interference layer and the insulating layer, so that the service life of the cable is prolonged, and stable operation of a power system is ensured.

The invention discloses a metallurgical-defect-free high-temperature wear-resistant cobalt-based alloy coating and a preparation method and application thereof.The preparation method comprises the following steps that (1) Fe powder, Co powder, Cr powder, Ti powder, Mo powder and Ni powder are accurately weighed according to the stoichiometric equation Co57Fe5Ni5Cr25Ti5Mo3, and (2) the weighed powder is put into a ball milling tank to be subjected to ball milling, so that the powder is evenly mixed, and then drying, sieving and drying storage are conducted; (3) 5NiCrMo hot work die 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 removed; and (4) a laser directional energy deposition method in laser additive manufacturing is used for continuously depositing the crack-free cobalt-based alloy coating with high temperature resistance, wear resistance and no cracks one by one. The high-temperature wear-resistant alloy shows excellent wear resistance at a high temperature, the alloy has a shallower wear depth and a narrower grinding crack width at the high temperature, and the wear rate at the high temperature of 800 DEG C is reduced from 2.171 * 10 <-4 > mm < 3 > / N.m of a 5CrNiMo base material to 2.45 * 10 < 6 > mm < 3 > / N.m of a coating.

The invention relates to the technical field of metal materials, and particularly discloses light-weight high-toughness medium manganese steel and a preparation method and application thereof. The method comprises the following steps: firstly, pre-oxidizing a hot rolled plate in a specific low oxygen partial pressure atmosphere, and forming a compact Al2O3-MnO composite oxide layer which is well combined with a matrix on the surface in situ; and then, in multi-pass warm rolling, synchronous plastic deformation of the oxide layer and the base body can be achieved, and interface stripping is avoided. And finally, in the circulating annealing process, a surface oxide layer serves as a diffusion barrier to inhibit Mn element leakage and enrich the Mn element towards the core, so that the heterogeneous structure with the continuous gradient characteristic is successfully constructed, specifically, the surface layer is superfine martensite, the transition area is an austenite-ferrite double-phase structure, and the core is Mn-rich coarse grain austenite. The gradient tissue enables the material to have high strength, high wear resistance and high plasticity at the same time, and is suitable for medical instruments with comprehensive requirements for mechanical properties, light weight and biocompatibility, such as knee joint tractor fixing braces.