508results about How to "Reduce surface roughness" patented technology

The invention provides an electromagnetic field composite powder feeding type plasma arc additive manufacturing formability regulation and control method and system, and relates to the technical field of plasma arc additive manufacturing. The flowing direction and speed of liquid metal in a molten pool in the deposition process are regulated and controlled through the target composite electromagnetic field, and the morphology and the internal organization structure of a deposition layer are controlled; in the process of regulating and controlling the liquid metal in the molten pool, process parameters and molten pool dynamic image data in the deposition process are collected in real time, and a pre-trained state recognition model is used for conducting self-adaptive adjustment on the process parameters of a subsequent deposition layer; and after deposition of each layer is completed, a laser scanning system is adopted for measuring the actual geometric size and surface appearance of the deposition layer, deposition manufacturing of the next layer is executed based on the optimized composite electromagnetic field control parameters, the corrected layered slicing data and the process path, and the execution is executed circularly till manufacturing of the whole workpiece is completed.

The invention discloses a silicon carbide crystal ingot laser cutting fragmentation method and system, and relates to the technical field of silicon carbide laser processing. The method comprises the steps that laser parameters are set, a laser beam focus is focused at the preset depth in a silicon carbide crystal ingot to be cut, a light spot generates a cutting point at the position of the preset depth, the cutting point forms a carbonization area, and a crack area is formed around the carbonization area; a laser scanning path and parameters are set, so that the multiple cutting points are overlapped to form cutting channels, the multiple cutting channels form a cutting face, the multiple carbonization areas form a carbonization area layer, and the multiple crack areas form a crack area layer; taking the carbonization region layer as an interface, and stripping one part of the silicon carbide crystal ingot to obtain a silicon carbide wafer; and accurately grinding the silicon carbide wafer to a target roughness and a target thickness.

The invention discloses a perovskite solar cell based on 1, 2PDADI (1, 2-propane diamine hydriodic acid) interface modification and a preparation method thereof, and belongs to the technical field of perovskite solar photovoltaics. The device structure of the cell sequentially comprises ITO conductive glass, a SnO2 electron transport layer, a 1, 2PDADI modification layer, a perovskite light absorption layer, a hole transport layer and an Ag counter electrode from bottom to top, the preparation method specifically comprises the following steps: (1) cleaning and blow-drying the ITO conductive glass; (2) spin-coating SnO2 nano dispersion liquid, and carrying out annealing treatment; (3) spin coating of a 1, 2PDADI / IPA solution is carried out, and annealing treatment is carried out; (4) spin-coating a perovskite precursor solution, and performing annealing treatment; (5) spin coating of a Spiro-OMeTAD precursor solution is carried out, and oxidation treatment is carried out; and (6) carrying out vacuum evaporation on an Ag counter electrode to obtain the 1, 2PDADI interface modified perovskite solar cell. The preparation process is simple and convenient, the cost is low, the prepared perovskite solar cell is small in hysteresis effect and high in photoelectric conversion efficiency, and a feasible thought and method are provided for commercialization of the perovskite solar cell.

The invention discloses a preparation method of a spherical cerium-based abrasive material with high hardness and high Ce < 3 + > content. The method comprises the following steps: 1, carrying out hydrothermal reaction on cerium salt and aluminum salt in an ethylene glycol solution to generate a cerium-based abrasive precursor; 2, firing the cerium-based abrasive precursor to obtain a cerium oxide spherical abrasive doped with aluminum oxide; and 3, reducing the cerium oxide spherical abrasive by sodium borohydride to obtain the spherical cerium-based abrasive with high hardness and high Ce < 3 + > content. According to the method, aluminum ions are doped into the cerium oxide spherical abrasive through a one-step hydration method, the hardness of the abrasive is improved, meanwhile, a large amount of Ce < 4 + > is efficiently and rapidly reduced into Ce < 3 + > ions through an in-situ reduction method, and the polishing efficiency of the abrasive is improved. The cerium-based abrasive synthesized by the method is uniform in granularity, good in morphology, high in hardness and high in Ce < 3 + > content, and the polishing rate of silicon carbide can be remarkably increased and the surface roughness can be remarkably reduced when the cerium-based abrasive is prepared into a silicon carbide polishing solution; and the preparation method is simple, good in repeatability, green and environment-friendly, and beneficial to industrial production.

The invention discloses a magnetorheological polishing processing method for a NiP modified reflector, which comprises the following steps of: preparing a NiP modified layer, and carrying out ultra-precision turning processing and magnetorheological polishing modification processing on the NiP modified layer until the NiP modified layer meets index requirements. According to the magnetorheological polishing machining method for the NiP modified reflecting mirror, the NiP modified reflecting mirror blank workpiece is machined through ultra-precision turning and magnetorheological polishing, so that surface defects generated in the machining process of the NiP modified reflecting mirror blank workpiece can be effectively eliminated, and the machining efficiency can be improved; meanwhile, the surface shape precision and the surface quality of machining can be improved, the NiP modified reflector blank workpiece can be machined into the high-quality NiP modified reflector, and the method has the advantages of being few in machining defect, high in machining quality, high in machining efficiency, good in repeatability and the like; the method is of great significance in promoting wide application of the NiP modified reflector in the optical fields of visible light wave bands, shorter wavelength wave bands and the like.

The invention belongs to the technical field of grinding and polishing, and particularly relates to an aluminum nitride ceramic polishing process. The polishing process comprises the following steps that the aluminum nitride ceramic substrate is placed on a polishing pad, and polishing liquid is added for polishing; the polishing solution is prepared from the following components in parts by weight: 15-20 parts of a composite abrasive, 2-4 parts of an oxidant, 8-10 parts of a functional compound and 60-70 parts of water are mixed into a solution, and the pH value of the solution is adjusted to be 4-4.5 by using organic acid; the polishing solution provided by the invention has good suspension stability and antibacterial performance, the polishing solution is used for polishing the aluminum nitride ceramic substrate, the polishing rate is high, the polishing effect is good, and the aluminum nitride ceramic substrate which is small in surface roughness and free of scratches can be obtained.

The invention provides a device and a method for polishing and repairing a blisk of an aero-engine by using composite laser aiming at the common problems of cracks and surface roughness in the machining process of the blisk of the aero-engine, and the device comprises a five-axis moving platform system, a 1064nm infrared laser generator system and an optical ranging system; according to the method, a six-axis composite laser polishing and repairing device is utilized, a high-precision multi-wavelength and multi-frequency-band laser scanning device is carried, continuous polishing and repairing serve as a main body, and a five-axis moving platform system, a 1064nm infrared laser generator system, an optical distance measuring device and an ultrasonic scanning and surface analysis technology are combined. Honeycomb-shaped cracks left on the surface of the blade of the blade disc through milling are successfully repaired, and the surface quality of the blade disc is remarkably improved. According to the device and method, the repairing effect is excellent, the polishing efficiency is remarkably improved, and the time needed by traditional manual polishing can be greatly shortened. In addition, the surface roughness of the bladed disc repaired through the composite laser polishing repairing method is remarkably reduced, and the influence on the flowing property of working fluid is effectively controlled. Therefore, the method has important engineering application prospects and is expected to bring remarkable method progress and economic benefits in the field of aero-engine manufacturing.

The invention discloses a preparation method of an ultra-fine grain copper target material, which comprises the following steps: step 1, sequentially cleaning and polishing an oxygen-free copper plate to obtain a pre-rolled plate; secondly, the two pre-rolled plates are overlapped and fixed, then multi-pass rolling is conducted at the temperature below the recrystallization temperature of the oxygen-free copper plate, and rolled plates are obtained; thirdly, the rolled plate is cut from the middle, then the first step and the second step are repeated for multiple times, and a machined plate is obtained; and fourthly, the machined plate is subjected to recovery annealing and then is sequentially straightened, machined and cleaned, and the ultra-fine grain copper target material is obtained. According to the method, the copper plate is subjected to severe plastic deformation by adopting an accumulative roll-bonding technology, the refining limit of a traditional machining mode on the grain size is broken through through large dependent variable, super refining of the grain size of pure copper is achieved, the ultra-fine grain target material is obtained, used equipment is simple, the size of a prepared sample is large, continuous industrial production of ultra-fine grain plates can be achieved, and the method is suitable for industrial production. And the method is a very potential production technology for industrialization of the ultra-fine grain target material.

The invention discloses a processing method of a spinneret plate, which comprises the following steps: acquiring a plate material, and pretreating the plate material to obtain a blank of the spinneret plate; the blank is installed on an automatic punching machine tool, punching is conducted on the same position of the blank for at least three times, modification treatment is conducted after punching of the blank is completed every time, and the spinneret plate is obtained. The invention further discloses the lyocell spinneret plate. According to the spinneret plate, the same position in the spinneret plate blank is subjected to multiple times of punching and other operations, spinneret orifices formed through multiple times of punching are low in roughness and higher in size precision, meanwhile, the strength of materials in the orifices is enhanced, and the problems that in spinning production, yarn breaking and doubling are likely to happen, adhesion is likely to happen, and the plate replacement cleaning difficulty is large can be solved.

The invention provides electroplating liquid, an electroplating method, an alloy bump and a preparation method of the alloy bump. The electroplating solution comprises the following components with mass concentration: 5-20 g / L of water-soluble cyanogen-containing gold salt, 1-15 g / L of water-soluble silver-containing salt, 0.5-5 g / L of cobalt citrate, 1-10 g / L of a refiner, 20-100 g / L of conductive salt, 10-90 g / L of a compound complexing agent and the balance of deionized water. The refining agent is selected from one or more of sodium lignin sulfonate, 5-nitroguaiacol sodium salt, sodium carboxymethyl cellulose and sodium alginate. Cobalt citrate and a specific substance are selected as refiners, so that the prepared gold-silver alloy bump is high in hardness and low in surface roughness; and through matching of the complexing agent, the antioxidant and the stabilizer, the oxidation resistance and the stability of the electroplating liquid are greatly improved, and the service life is prolonged.

The invention discloses a shape-preserving polishing method for a nickel-phosphorus grating microstructure of a composite abrasive. The shape-preserving polishing method comprises the following steps: (1) preparing a composite abrasive polishing solution; (2) cleaning the surface of the workpiece, and fixing the workpiece on a polishing platform; (3) setting a spiral machining path, a polishing load and polishing time; and (4) a polishing pad with the high hardness is matched with the composite abrasive polishing solution to polish a workpiece, and then a polishing pad with the low hardness is matched with the composite abrasive polishing solution to polish the workpiece. According to the shape-preserving polishing method, by regulating and controlling the conditions of the median particle size of Al2O3, the content of Al2O3, the pH value, the content of an oxidizing agent, the combination of soft and hard polishing pads and the like, the shape of a microstructure is considered while residual tool marks are removed and the surface roughness is reduced, and shape-preserving polishing is achieved.

The invention relates to the field of fuel cells, and particularly discloses a gas diffusion layer, a preparation method thereof and a proton exchange membrane fuel cell applying the gas diffusion layer, and the preparation method of the gas diffusion layer comprises the following steps: preparing porous substrate layer carbon paper; performing hydrophobic treatment on the porous substrate layer carbon paper to obtain hydrophobic carbon paper; a hydrophobic agent and water are mixed to obtain hydrophobic slurry A, conductive powder, a surfactant, a binder and an organic solvent are mixed and dispersed to obtain conductive powder slurry B, the hydrophobic slurry A and the conductive powder slurry B are mixed to form spraying slurry C, the spraying slurry C is sprayed on hydrophobic carbon paper while being stirred, drying and curing are conducted after spraying, and a microporous layer is formed. A gas diffusion layer is obtained; the invention further discloses the gas diffusion layer prepared by adopting the method and the proton exchange membrane fuel cell applying the gas diffusion layer. The application has the characteristics of solving the problems of dispersion uniformity of the conductive powder in the slurry and sedimentation in the coating process, improving the quality of the microporous layer and further improving the performance of the fuel cell.

The invention relates to the technical field of electro-coppering additives, and particularly discloses a PCB electro-coppering additive and a preparation method and application thereof.The PCB electro-coppering additive comprises an accelerator, an inhibitor and a leveling agent, the accelerator is sodium 3, 3 '-dithiodipropane sulfonate, the inhibitor is polyethylene glycol-6000, and the leveling agent is sodium dodecyl benzene sulfonate. The leveling agent is at least one organic matter with a chemical formula containing a pyridinium salt structure, the proportion of the accelerator is 1-10 ppm, the proportion of the inhibitor is 150-300 ppm, and the proportion of the leveling agent is 1-10 ppm; according to the method, the activation energy of electroplating reaction can be remarkably reduced and the reduction deposition of copper ions can be promoted by adding the accelerator (sodium polydithiodipropane sulfonate), so that the electroplating speed is increased, the electroplating period is shortened, the production efficiency is improved, the inhibitor (polyethylene glycol-6000) is adsorbed on the surface of the electrode to inhibit excessive deposition of copper in a specific area, and the production efficiency is improved. And a leveling agent (an organic matter containing a pyridinium salt structure) can further level the surface of the plating layer, so that the plating layer is smoother and finer, and the appearance quality and the mechanical property of the plating layer are improved.

The invention relates to the technical field of high-speed cable shielding materials, and discloses a manufacturing method of rolled copper foil for high-speed cable shielding. The method comprises the following steps: preparing a copper plate; performing multi-pass cold rolling on the copper plate to form an elongated grain structure oriented along the rolling direction; performing controlled annealing on the cold-rolled copper foil to recover plasticity and inhibit complete recrystallization; the target thickness is obtained through finish rolling; carrying out finishing rolling on at least one surface of the copper foil by adopting a mirror surface working roller so as to reduce the surface roughness; and performing surface smoothing or passivating treatment to inhibit oxidation and performance degradation. Therefore, the obtained rolled copper foil has good ductility, structural stability and high-frequency performance.

The invention discloses a filter and a forming method thereof, and electronic equipment, and the method comprises the steps: carrying out the thinning of a passivation material layer in a target resonance region through first thinning processing after a piezoelectric laminated structure is provided, so as to enable the thickness of a passivation layer in the target resonance region to be smaller than the thickness of passivation layers in other resonance regions, therefore, the vibration frequency of the passivation layer of the target resonance area is faster than that of the passivation layer of other resonance areas, the frequency of the resonator of the target resonance area shifts rightwards, the target resonance area is used for forming the resonator with the highest vibration frequency, the bandwidth of the corresponding filter is increased, and the bandwidth of the filter is increased. The surface roughness of the passivation layer in the target resonance area is further reduced through the first thinning treatment, which means that the thickness uniformity of the passivation layer in the target resonance area is improved, so that the right side frequency of the filter bandwidth is modulated, the uniformity of the right side frequency of the filter bandwidth is improved, and the filter performance is improved. And during measurement, more frequency points fall within the range of specification requirements, so that the yield of the filter can be improved.

The invention discloses a post-treatment method of an additive manufacturing metal part, and aims to solve the problem of insufficient fatigue performance caused by large surface roughness, internal residual tensile stress and the like of the additive manufacturing metal part. The fatigue weak part of the part can be directly subjected to high-frequency scanning treatment by using a micro-scale laser shock peening method under the conditions of no absorption protection layer, no water-light coaxial restraint layer and the like, and the surface roughness is reduced through the direct ablation melting effect of micro-scale small-energy pulse laser and the surface of the part; residual compressive stress is formed on the surface layer of the part through the mechanical effect of laser-induced shock waves, the surface smoothness is improved, the fatigue performance is improved, a laser melting / heat affected layer is removed through sand blasting, the surface smoothness is further improved, and therefore rapid post-treatment of the additive manufacturing metal part is achieved, and the method can be directly applied to engineering.

The invention discloses a preparation method of a release film, which comprises the following steps: a, mixing cycloolefin resin, chlorine-containing resin, a cross-linking agent and an organic solvent to obtain a release agent; b, coating a substrate film with the release agent obtained in the step a, and carrying out heating treatment to obtain a release film prefabricated product; and c, carrying out electron beam radiation crosslinking on the release film prefabricated product prepared in the step b to prepare the release film. The release film prepared by the method disclosed by the invention has good temperature resistance and tensile strength, lower stripping force and lower surface roughness, the adhesion of a release layer and a base material is excellent, the release agent can be effectively prevented from being transferred to the proton exchange membrane, and the preparation process requirements of the proton exchange membrane can be met.

The invention discloses an alkali corrosion liquid for silicon in the semiconductor industry and a corrosion method of the alkali corrosion liquid. According to the alkali corrosion liquid, a corrosion method of slow acid corrosion and sufficient alkali corrosion is adopted, the surface roughness of the silicon wafer can be effectively reduced, in addition, in the alkali corrosion liquid, a surfactant, an active additive, sodium dodecyl polyoxyethylene ether sulfate and the like are matched with alkali, so that the surface tension of the alkali is further reduced, the corrosion rate is higher, and the service life of the silicon wafer is prolonged. The surface tension can be effectively reduced, the affinity of the etching liquid and a silicon substrate is improved, the selective etching capability to silicon dioxide in the etching process can be enhanced, corrosion to the silicon substrate is reduced, and a more uniform and accurate etching effect is achieved. Through measurement, the surface roughness Ra of the silicon wafer obtained by the corrosion method is less than or equal to 0.1 mu m, and the single metal cation is lt; and the corrosion rate can reach 1-1.5 microns / minute and is stabilized within + / -5%.

The invention relates to the technical field of microelectronic devices, and provides a flexible self-supporting vertical optical waveguide array and a preparation method and application thereof. According to the flexible self-supporting vertical optical waveguide array and the preparation method thereof, an ultraviolet-curable SU-8 polymer is used as an optical waveguide material, a vertical optical waveguide array is prepared on a substrate by using simple coating, photoetching and ICP etching processes, then a flexible supporting layer is prepared, and the substrate is removed, so that the flexible self-supporting vertical optical waveguide array is obtained. The flexible self-supporting vertical optical waveguide array provided by the invention can solve the photoelectric crosstalk problem of an image sensor, improves the detection sensitivity in a weak light environment, has excellent flexibility, and can realize conformal fitting with the surface of the image sensor; moreover, the flexible self-supporting vertical optical waveguide array does not depend on the pixel size of the image sensor, the preparation process is independent of the preparation process of the image sensor, the universality is high, and the flexibility is good.

The invention discloses a solar cell, a photovoltaic module and a semiconductor substrate, and relates to the technical field of photovoltaics, so that a passivation layer has a good passivation effect on the semiconductor substrate. Meanwhile, the contact performance of the doped semiconductor layer and the electrode and the shaping of the electrode are improved, and the conversion efficiency of the solar cell is improved. The solar cell comprises a semiconductor substrate and a passivation layer. The semiconductor substrate has a first surface and a second surface opposite to each other. At least one of the first surface and the second surface is a target surface. The passivation layer is disposed on the target surface. And one side of the passivation layer away from the semiconductor substrate is provided with a plurality of tower footing-like texture structures which are recessed towards the passivation layer. Wherein each tower footing-like texture structure is defined by a polygon-like bottom surface and side surfaces. In the same tower footing-like texture structure, at least one corner of the polygon-like bottom surface is provided with a plurality of protrusions climbing in the extension direction of the side ridge, and the protrusions on the same corner are provided with fluctuating shapes extending in the direction parallel to the polygon-like bottom surface.

The invention provides a composite manufacturing method for improving the integrity of the side face of a 316L part manufactured through selective laser melting additive manufacturing. The composite manufacturing method comprises the following steps that S1, selective laser melting additive manufacturing is conducted on the part; in this step, each layer is divided into a boundary region and a core region, and differentiated scanning strategies are implemented. Specifically, the boundary area adopts a scanning strategy of parallel section contour lines, and the core area adopts a conventional strip or chessboard type scanning strategy, so that the surface quality is optimized; and S2, ultrasonic surface deep rolling post-treatment is conducted on the side face of the part. The method is characterized in that through the combination of partition scanning and post-treatment, the excellent surface integrity, including high surface hardness, high corrosion resistance and low surface roughness, of the side face of the additive manufacturing 316L stainless steel part is achieved. Particularly, the surface roughness reaches the precision grinding level, meanwhile, the thin-wall part manufactured through the method shows extremely high strength and plasticity at the same time, and therefore the requirement for high-performance application is met.

The invention belongs to the field of material and electronic device manufacturing, and discloses a capacitive micromachined ultrasonic transducer based on 3D printing and a preparation method thereof.The CMUTs comprise an upper electrode, an upper insulating layer, a vibrating membrane, a supporting column layer, a silicon substrate and a lower electrode which are sequentially connected from top to bottom, and a cavity is formed among the vibrating membrane, the lower insulating layer and a supporting column of the supporting column layer; the method comprises the following steps: printing a pillar layer array on the front surface of a silicon substrate with a functionalized surface by utilizing a nano silicon dioxide composite material and adopting a photocuring 3D printing method; then curing and heat treatment are carried out to obtain a second device; bonding a vibrating diaphragm; printing an insulating layer on the front surface of the vibrating diaphragm; carrying out curing and heat treatment; printing an upper electrode; removing the silicon dioxide on the back surface of the silicon substrate through a wet etching process; printing a lower electrode on the back of the silicon substrate; and removing the photoresist. According to the invention, the consumption of required equipment and materials is reduced, and the production cost is reduced.

The invention relates to a super wear-resistant tungsten carbide composite TiSiN / DLC / t-ZrO2 coating technology and a preparation method thereof, and aims to improve the performance of equipment under extreme working conditions. By combining a novel mixed TiSiN / DLC / t-ZrO2 coating technology, the hardness and wear resistance of the coating are remarkably improved, the fracture toughness is enhanced, the brittleness is reduced, and the impact resistance is improved. The preparation method comprises the following specific steps: preparing alpha-WC nano powder and t-ZrO2 powder, optimizing the dispersity and uniformity of the powder by adopting ultrasonic treatment and fine grinding, then adding a DLC layer on a TiSiN intermediate layer, and finally coating the surface of a base material with the powder through a cold spraying technology. Tests show that the prepared coating has excellent performances in the aspects of hardness, fracture toughness, wear resistance, high-temperature stability and the like, meets the requirements of high-performance materials, and is suitable for being applied in high-temperature, high-pressure and corrosive environments.

The utility model belongs to the technical field of cutting tools, and particularly relates to a cutting tool which comprises a lathe tool rest, two mounting grooves are formed in the front end and the rear end of the lathe tool rest respectively, adjusting assemblies are mounted on the outer walls of the front end and the rear end of the lathe tool rest respectively, a cutting tool is inserted into the mounting groove in the front end, and a rack is fixedly arranged on the front wall of the cutting tool. A plurality of mounting holes are formed in the top surface of the lathe tool rest in a front-back symmetrical structure, hexagon socket screws are in threaded connection with the interiors of the mounting holes, a water tank is fixedly arranged in the middle of the top surface of the lathe tool rest, the top surface of the water tank communicates with a filling pipe, a cooling mechanism is arranged on the right wall of the water tank, the adjusting assembly comprises a C-shaped block, and the inner wall of the C-shaped block is fixedly connected with the outer wall of the lathe tool rest. Uniform heat dissipation of the cutting tool is achieved, deformation caused by uneven heating of the cutting tool is effectively reduced, the roundness and cylindricity of a machined part by the cutting tool are improved, the surface roughness is reduced, the disordered corrugation phenomenon is reduced, and the machining effect of the machined part is improved.

The invention relates to a metal surface self-adaptive modified reinforced additive material and a preparation process and method thereof, which are characterized in that silicate-containing natural minerals, amorphous carbon, SiO2, metal mixed powder, a curing agent, a defoaming agent, white grease and basic lubricating oil are mixed and stirred to react for 24-48 hours in a reaction kettle at 60 DEG C to generate a gel product. Through online intervention of functional materials, modification and reinforcement of additive materials, dynamic superfinishing and solid-liquid multi-component composite lubrication, an equipment extremely-low-friction self-lubricating environment is constructed, and the purposes of reinforcement of kinematic pair friction interface material performance, dynamic optimization of matching pair gaps, targeted repair of abrasion, reduction of friction abrasion, prolonging of the service life of equipment and improvement of the energy efficiency of the equipment are achieved. And the energy consumption and the operation and maintenance cost of the equipment in the whole life cycle are reduced.

The invention discloses a spiral groove grinding wheel of an asymmetric trapezoidal turbulent flow structure and a preparation method, the spiral groove grinding wheel comprises a grinding wheel body, a spiral groove is formed in the grinding surface of the grinding wheel body, and the section of the spiral groove is rectangular; a turbulent flow structure is arranged in the spiral groove, the cross section of the turbulent flow structure is in an asymmetric trapezoid shape, and the bottom edge of the turbulent flow structure is in an arc shape and completely attached to the bottom face of the spiral groove. The turbulent flow structures are distributed at equal intervals in the spiral groove by taking the spiral groove as a guide; the asymmetric trapezoidal turbulent flow structure is additionally arranged on the surface of the spiral groove grinding wheel, the flow characteristic of grinding fluid can be improved, the absorption effect of the grinding fluid on the surface of the grinding wheel is improved, the effective flow of a grinding arc area in the grinding process is increased, and then grinding heat exchange is further enhanced.

The invention discloses a densified carbon nanotube film with low infrared emissivity and a preparation method thereof, and relates to the technical field of infrared stealth materials. The method comprises the following steps: firstly carrying out heat treatment on a carbon nanotube film in an inert atmosphere, and then putting the carbon nanotube film into an acid pickling solution for treatment, and dipping the pickled carbon nanotube film in chlorosulfonic acid, and heating to volatilize the chlorosulfonic acid to obtain the densified carbon nanotube film. The infrared emissivity of the prepared carbon nanotube film can be as low as 0.25 and is only 39% of the infrared emissivity value of an initial carbon nanotube film, so that the carbon nanotube film is expected to be applied to the field of infrared stealth.

The invention discloses a gradient powder sintered porous metal material based on surface micro-area treatment and a preparation method thereof, the material comprises a powder sintered porous metal material body and a gradient layer located on the body, the thickness of the gradient layer does not exceed 100 microns, and the surface aperture size does not exceed 5 microns; the preparation method comprises the following steps: 1, preparing the body through pressing forming, high-temperature sintering and processing; and 2, forming a gradient layer on the surface of the body by utilizing surface micro-area treatment. The material is composed of the powder sintering porous metal material body and the gradient layer, and by controlling the thickness and the surface aperture size of the gradient layer, the material has the advantages of being high in flux, low in cost and easy to blow back; in-situ construction of a gradient layer on the surface of a traditional powder sintering porous metal material body is achieved through surface micro-area treatment, the mechanical strength and the filtering performance of the material are improved, and the material is suitable for the fields of filtering, separation and purification, fluidized conveying control and the like.

The invention relates to the technical field of laser precision machining, and discloses a laser machining system and method for improving FPC drilling quality and efficiency, and the system comprises a nanosecond laser used for generating ultraviolet laser; the zoom beam expander is arranged at the outlet of the nanosecond laser and is used for adjusting the spot diameter of the laser beam; the plurality of reflecting mirrors comprise a reflecting mirror I, a reflecting mirror II, a reflecting mirror III and a reflecting mirror IV; the galvanometer is used for receiving and controlling the direction of the laser beam to realize drilling path control; the field lens is used for focusing the laser beam to the surface of the FPC to be processed; the processing platform is used for fixing the position of the FPC; and the lead mode laser drilling processing path is used for controlling the laser beam to cut in according to the lead path and completing the drilling operation. By adopting the lead mode technology, the system eliminates worries about the problems of laser switch delay, jump delay and the like while improving the jump speed, so that the production process is greatly simplified, the whole drilling process is more efficient and stable, and the production efficiency of the system is greatly improved.

The invention discloses a preparation method of a superhard high-entropy alloy nitride coating on the surface of an alloy material, which comprises the following steps: taking an alloy workpiece, and carrying out glow cleaning on the alloy workpiece in a vacuum environment; the cleaned alloy workpiece is placed in an argon environment, the air pressure of a vacuum chamber ranges from 0.3 Pa to 1 Pa, an AlCrTiVZr target material is sputtered to the alloy workpiece through HiPIMS, the deposition time ranges from 1 min to 10 min, and an AlCrTiVZr over-plating layer is gradually formed on the surface of the alloy workpiece; and the sputtering condition is kept, nitrogen is introduced into the reaction environment, the flow value of the nitrogen ranges from 4 sccm to 40 sccm, the deposition time ranges from 60 min to 180 min, the AlCrTiVZr over-plating layer is deposited on the surface of the alloy workpiece, and the high-entropy alloy nitride coating is formed. The problems that a columnar crystal microstructure on the surface of a common high-entropy alloy nitride coating is loose and many micropores exist are solved, the hardness of the coating is improved to 41.8 GPa, and the surface roughness of the coating is maintained to be 2 nm or below.