81results about How to "Reduce surface roughness" patented technology

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 application provides a ceria / yttria composite stabilized zirconia grinding medium and a preparation method. The method comprises the following steps: step one, mixing zirconia, ceria, yttria and kaolin, and then adding an appropriate amount of dispersant and water to obtain a slurry; step two, performing centrifugal spray drying on the slurry to obtain ceria / yttria composite stabilized zirconia powder; step three, adding the ceria / yttria composite stabilized zirconia powder into a binder, and then rolling to form a green body of spherical grinding medium; and step four, sintering and polishing the green body of spherical grinding medium to obtain the ceria / yttria composite stabilized zirconia grinding medium. The method can obtain low particle size and high specific surface area through high-temperature ball milling, and can also promote the solid solution of the stabilizer into the zirconia crystal lattice through heat treatment, so as to improve sintering activity, reduce sintering temperature and reduce production cost.

The invention discloses a preparation method of a standardized sheet for a thermoelectric test of minerals or mineral materials and alloys, belongs to the technical field of mineralogy, material science and prospecting prediction, and establishes a preparation process of a universal mineral or mineral material and alloy thermoelectric sheet. Covering all semiconductor mineral types or mineral material types such as pyrite, magnetite, graphite and sintered ore; accurate thickness control is achieved through a double-face polishing-loading sheet supporting structure, in-situ testing of the thermoelectricity of minerals or mineral materials and alloys is achieved, and the testing precision is improved; by adopting a conductive adhesive-copper plate composite structure, the interface resistance is reduced, the supporting strength is met, and the requirement of eliminating detection interference is met; residual colloid is thoroughly removed through ultrasonic cleaning, and the insulation effect is avoided; according to the standardized sheet, the hollow aminated phenolic resin nanosphere is used as a conductive substrate and is used for bonding a sample and a copper plate, the contact resistance between the sample and an electrode can be greatly reduced, and the accuracy of test data is improved.

The utility model relates to the technical field of papermaking mesh production, and discloses a drying device for monofilament papermaking mesh production, which comprises a shell, a cavity is arranged in the middle of an inner cavity of the shell, a motor is fixedly mounted on the rear portion of the inner cavity of the cavity, and a rotating handle is fixedly connected onto an output shaft of the motor through a coupler. The front portion of the rotating handle is movably connected with a traction rod through a shaft, the bottom end of the traction rod is movably connected with a lifting rod through a shaft, the lifting rod is movably connected with the bottom of an inner cavity of the cavity in a sleeved mode, a connecting block is fixedly installed at the bottom end of the lifting rod, and the bottom of the connecting block is movably connected with a stretching roller through a shaft. The stretching roller is driven by the motor to stretch and shake the monofilament papermaking mesh, material shrinkage stress is counteracted, mesh hole blockage and deformation caused by monofilament winding or adhesion are avoided, surface roughness or protrusions are reduced through mesh piece tensioning, the flatness requirement is met, water in the material is migrated through shaking, the water content is reduced, and therefore the needed drying time is shortened. The device working efficiency is improved.

This utility model discloses an external cylindrical grinding device, including a base, a workpiece driving mechanism, and a grinding mechanism. The grinding mechanism includes a crank mechanism, a guide rail, and a grinding block. A slider is slidably mounted on the guide rail, and the slider is connected to the crank mechanism, which drives the slider to slide along the guide rail. A vertical groove is formed on the upper side of the slider, and the grinding block is slidably mounted in the groove. A spring is provided between the grinding block and the bottom of the groove. Under the action of the spring, the upper end of the grinding block can extend out of the groove to fit tightly against the surface of the workpiece to be ground. This utility model, by employing a grinding device with a certain degree of elasticity, can adapt to different types of shaft workpieces to be ground, has good versatility, and during secondary processing, the grinding block can always be tightly fitted against the surface of the workpiece under the action of the spring, avoiding the impact of workpiece jump during secondary clamping on the original shape and position accuracy.

The utility model discloses a polishing mechanism for blade support welding, and relates to the technical field of blade support polishing, the polishing mechanism comprises a workbench and a first slide rail, the first slide rail is arranged on the top of the workbench, a supporting strip is arranged in the first slide rail, and two ends of the top of the supporting strip are provided with turnover motors; a plurality of supporting blocks are further arranged at the tops of the supporting strips, rotating shafts are arranged at the output ends of the two overturning motors, the two rotating shafts are rotationally connected to the interiors of the supporting blocks, placing grooves are formed in one sides of the two rotating shafts, a conveying assembly is arranged at the top of the workbench, and a moving assembly is arranged on the conveying assembly. Through the moving assembly, the effect of driving the blade support to reciprocate on the grinding roller is achieved, it is ensured that the grinding roller can make full contact with all the surfaces of the blade support, abrasive particles can also evenly act on the whole surface of the blade support, the surface roughness is effectively reduced, and the smoother and smoother surface is obtained.

The application discloses a batch preparation method of a silicon diamond infrared composite material and the silicon diamond infrared composite material, and the method comprises the following steps: taking a nano-diamond suspension as a crystal seed, and performing spin coating on a plurality of silicon substrates at 200-400 r / min for 10-30 s, and then performing high-speed spin coating, wherein the spin coating liquid is a diamond suspension; adopting an HFCVD method to deposit a diamond film on one side of the plurality of silicon substrates; the process parameters of the HFCVD method comprise that the distance between hot wires is 10-15 mm, the distance between the hot wires and the silicon substrates is 8-12 mm, and the temperature of the hot wires is 1000-1200 DEG C; and the diamond film is deposited on the other side of the plurality of silicon substrates. The method can batch-prepared diamond films with high antireflection performance and low surface roughness, realizes simultaneous processing of the plurality of silicon substrates in a single deposition, and greatly reduces equipment investment and preparation cost.

This invention belongs to the field of transparent conductive film technology, specifically relating to a flexible transparent conductive film with ordered silver nanowires and its preparation method. The preparation method includes the following steps: preparing AgNW conductive ink; coating a first layer of silver nanowires onto a substrate surface, and drying the resulting monolayer silver nanowire wet film; coating a second layer of silver nanowires onto the surface of the monolayer silver nanowire film along a coating direction perpendicular to the first coating; drying the resulting bilayer orthogonal silver nanowire wet film and then cold rolling it to obtain a flexible transparent conductive film with ordered silver nanowires. This flexible transparent conductive film with silver nanowires exhibits high light transmittance, low sheet resistance, and low surface roughness.

The application discloses a kind of surface micro-arc oxidation dense ceramic film aluminum alloy and its preparation method.After annealing treatment of aluminum alloy base material, it is in turn treated by oil and grease removal, micro-arc oxidation and drying, and obtained;The conditions of the annealing treatment are as follows: temperature is 200-300 DEG C, time is 50-80 min;The conditions of the micro-arc oxidation are as follows: current density is 8-10 A / dm 2 , time is 15-20 min;The method forms dense ceramic film on the surface of alloy base material through the synergistic effect of annealing and maintenance oxidation, which can effectively improve the comprehensive performance of the material;The aluminum alloy obtained by the technical scheme of the application has excellent corrosion resistance and wear resistance, and solves the corrosion problem of aluminum alloy welding structure in high temperature, high humidity and high salt mist environment.

The application discloses a kind of food-grade silica gel triple-sealed high-precision bearings, it is related to bearing technical field, including bearing inner ring, bearing outer ring and the sealing ring of being installed in the inner side of bearing outer ring, the outer raceway both sides of bearing inner ring are equipped with one straight angle sealing groove with the cross section of 90 ° at two ends of shoulder or baffle respectively;The sealing ring includes metal framework and food-grade silica gel rubber coating integrally formed on the metal framework;The food-grade silica gel rubber coating extends towards the inner side of bearing inner ring and forms integrated three sealing lips, including two radial sealing lips with the contact of two radial side walls of the straight angle sealing groove, and one axial sealing lip with the contact of the axial bottom surface of the straight angle sealing groove.The application has the beneficial effects of material safety, no pollution, excellent sealing performance, high processing efficiency, the processing cycle is shortened by more than 40%, the leakage rate is reduced by more than 95%, and has wide application value.

The utility model discloses a stainless steel strip polishing device capable of enhancing the surface heat dissipation efficiency, and relates to the technical field of stainless steel strip polishing. The device comprises an outer box, an inner box, a mounting frame, a first motor and a second motor, the inner box is arranged in the outer box, a stainless steel belt is conveyed in the inner box, the mounting frame is arranged in the inner box, and two sets of symmetrically-distributed transmission rollers are rotationally mounted in the mounting frame; the outer wall of the transmission roller is sleeved with a polishing belt attached to the two ends of the stainless steel belt, cooling water higher than the stainless steel belt is arranged in the inner box, stroke openings higher than the upper end of the outer box are formed in the two ends of the inner box, and the stainless steel belt penetrates through the stroke openings in a sliding mode. The outer wall of the linkage chain wheel is sleeved with a chain. The stainless steel strip polishing device is immersed in cooling water to polish a stainless steel strip, so that the problem of low cooling efficiency caused by insufficient heat carrying capacity of air is solved.

The invention discloses an internally-added non-silicon release master batch, a preparation method and a release film with nanoscale roughness, preparation raw materials comprise PET resin I, a non-silicon release agent composition and an antioxidant, and the non-silicon release agent composition comprises polyester wax and oxidized polyethlene wax. According to the invention, polyester wax and oxidized polyethlene wax are compounded, and a release functional phase which is uniformly dispersed in nanoscale and has a stable interface is constructed in a PET matrix through a unique molecular synergistic effect and a processing technology matched with the polyester wax and the oxidized polyethlene wax, so that the fundamental contradiction that the surface of an internally added release film is rough and the release function is difficult to consider at the same time is solved; and meanwhile, silicon migration pollution is fundamentally eradicated, the process is simplified by utilizing an internal addition process, and recycling is facilitated.

This invention provides a cathode roller for electrolytic copper foil, its grinding and polishing method, and its application. The method includes three-step grinding using a grinding device and two-step polishing using a polishing device. Specifically, the grinding device for the first step uses a grit size of any one of 46# to 120#; the grinding device for the second step uses a grit size of any one of 220# to 400#; the grinding device for the third step uses a grit size of any one of 600# to 1000#; the polishing device for the first step uses a mesh size of any one of 800 mesh to 1500 mesh; and the polishing device for the second step uses a mesh size of any one of 2000 mesh to 3500 mesh. This grinding and polishing method, by using a grinding device with a specific grit size for three-step grinding and a polishing device with a specific mesh size for two-step polishing, significantly reduces the surface roughness of the cathode roller, showing good application results in the manufacture of smooth, roughened, low-profile electrolytic copper foil.

The invention discloses a preparation method of poly (p-hydroxystyrene), poly (p-hydroxystyrene) and application, and relates to the technical field of organic synthesis. According to the preparation method, 4-acetoxystyrene, 4-hydroxyphenyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate and 1-ethyl cyclopentyl methacrylate are taken as monomers, and the P (HSt-co-HADMA) copolymers with different HADMA proportions are obtained through RAFT (reversible addition-fragmentation chain transfer) polymerization. According to the copolymer, large-volume side groups are introduced, so that the glass-transition temperature of PHSt is effectively increased, the processing window of subsequent acid diffusion is improved, and the film-forming property of the copolymer is also effectively improved. Along with the increase of the HADMA content, the cracking condition of the film is improved, and the surface roughness is reduced.

The application discloses a method for modifying a hyaluronic acid grafted polyamide membrane against pollution by a thermal method and application thereof, and relates to a method for modifying a polyamide membrane against pollution and application thereof. In order to solve the problem of poor anti-pollution performance of the existing polyamide membrane, the application uses hyaluronic acid for surface grafting modification of the polyamide membrane. Due to the super-hydrophilic property of the hyaluronic acid, a hydration layer is formed on the surface of the modified polyamide membrane, effectively hinders the adhesion of pollutants, and meanwhile, part of the short chains of the hyaluronic acid can promote the desorption of the membrane surface pollutants while being hydrolyzed, so that the flux recovery rate of the membrane is improved, and the operation cost is reduced. Compared with the traditional polyamide membrane or other modification methods, the anti-pollution performance of the hyaluronic acid modified polyamide membrane is significantly improved, and the anti-pollution efficiency is excellent in the treatment of shale oil fracturing flowback wastewater. The application belongs to the technical field of water treatment membrane preparation.

The application discloses a high-end caliper stainless steel surface composite strengthening system and process, which comprises a quenching device, a tempering device, a rolling device, a high-current pulse electron beam irradiation device and an ultrasonic cleaning device. The process specifically comprises the following steps: S1, quenching treatment; S2, tempering treatment; S3, rolling treatment; S4, high-current pulse electron beam irradiation treatment; and S5, cleaning treatment. The system can perform three-blade rolling treatment on the heat-treated caliper through the rolling device, can homogenize the surface layer structure of the caliper while improving the machining efficiency, can reduce the surface roughness of the caliper, can effectively realize the overall straightening of the caliper, and can reduce the quenching deformation. After the surface modification of the caliper through the high-current pulse electron beam irradiation device, the caliper can form a surface layer with uniform composition and nanometer-sized grain refinement, can not have obvious interface between the caliper matrix and the nanometer structure surface layer, and can not easily fall off, so that the service life of the caliper is greatly prolonged.

A welding method for reducing residual stress and improving surface morphology in thick steel plates is disclosed, relating to the field of welding. The method includes the following steps: applying a large-diameter impact head to the target area of ​​the weld joint on the thick high-strength steel plate using full-coverage ultrasonic impact treatment; and applying a small-diameter impact head to the target area of ​​the weld joint on the thick high-strength steel plate using full-coverage ultrasonic impact treatment. This method utilizes the deep strengthening function of the large-diameter impact head and the surface finishing function of the small-diameter impact head to achieve a synergistic effect, reducing residual stress in the thick high-strength steel plate while simultaneously lowering surface roughness.

This invention belongs to the field of ceramic equipment manufacturing technology, and discloses a metallized ceramic shell for a vacuum interrupter and its processing technology. The process uses low-sodium α-alumina with 0.5~1μm grain size as raw material, and acid washing improves its chemical purity and grain boundary stability. During granulation, the moisture content is controlled to ≤0.1%, and homogenization is used to remove iron and eliminate conductive impurities. A drying process is added between pressing and turning to improve processing precision. Through programmed temperature sintering combined with atmosphere control, the crystal structure is optimized and organic matter and gases are expelled, avoiding closed pore defects. After firing, polishing reduces surface roughness and prevents dust adsorption and conductivity. The glazing process uses bentonite and silica to adjust the glaze viscosity, ensuring uniform glaze coverage and matching the thermal expansion of the ceramic body, improving the outer surface insulation performance. The synergistic effect of each step comprehensively improves the purity, density, and surface quality of the ceramic shell, effectively meeting the stringent insulation strength requirements of high-voltage vacuum interrupters.

This invention provides a method, apparatus, and semiconductor device for atomic layer etching of hafnium oxide. The method includes performing multiple cycles of etching on the hafnium oxide layer on the top surface of the device to be etched within a reaction chamber until the hafnium oxide layer reaches the target etching requirement. Each cycle includes: adjusting the temperature of the device to be etched to a target reaction temperature; providing a process gas containing a chlorine-based gas; dissociating the process gas into a plasma containing ions and chlorine radicals; filtering the ions in the plasma to obtain chlorine radicals, and reacting the chlorine radicals with the top surface of the hafnium oxide layer at the target reaction temperature to generate a hafnium tetrachloride layer; and heating the device to be etched to a target sublimation temperature to vaporize and discharge the hafnium tetrachloride layer. This invention can reduce the damage to hafnium oxide during etching and achieve higher etching uniformity and precision.

The application belongs to the technical field of surface modification and relates to a system and method for preventing the inner wall of a fly ash low-temperature pyrolysis furnace from being caked, which comprises the following steps: S1, inner wall surface pretreatment: performing sand blasting polishing treatment on the inner wall of the low-temperature pyrolysis furnace to remove surface rust, residual caked substances and caking force points, then cleaning surface oil stains with an organic solvent, and then blowing dry with high-pressure air and removing residual dust; S2, hydrophobic coating spraying and curing: uniformly spraying a hydrophobic coating material on the inner wall surface treated in step S1, controlling the coating thickness to be less than 100 microns, and then putting into use after natural curing and static curing; and S3, intermittent high-pressure inert gas blowing during operation: in the operation process of the low-temperature pyrolysis furnace, the high-pressure gas blowing subsystem sprays high-pressure inert gas to the inner wall of the low-temperature pyrolysis furnace in an intermittent and instantaneous burst mode to remove the fly ash initially adhered to the inner wall and inhibit the formation and growth of caking points.

This utility model belongs to the field of fan blade technology and discloses a multi-blade noise-reducing blower fan blade, including: a fan blade assembly comprising 53 forward-curved fan blades evenly distributed along the circumference of a hub, with a motor mounting cavity at the center of the hub; the axial end face of the hub has several heat dissipation holes, arranged equidistantly along the circumference to form an annular heat dissipation channel; a motor assembly comprising a thickened silicon steel sheet frame, the silicon steel sheet thickness being 0.5-0.8mm; the ratio of the fan blade diameter D to the fan outer diameter D0 is 75%-78%; this utility model, by using 53 forward-curved fan blades with an optimized bending angle of 15°-25°, and a chord length ratio of the leading edge to the trailing edge of the blades of 1:0.8-1:0.9, effectively suppresses turbulence and eddy noise. An arc-shaped transition section with a transition radius R = 3-5mm is provided at the connection between the hub and the fan blades to reduce airflow separation noise.

The utility model discloses a kind of tensile tear-resistant reinforced CPVC cable protection pipe, it includes pipeline, the inside fixed connection of pipeline has CPVC resin, the inside fixed connection of CPVC resin has nano calcium carbonate, the inside fixed connection of nano calcium carbonate has calcium-zinc stabilizer.Through the above structure, there is a layer of CPVC resin in pipeline, the smooth surface of CPVC resin can reduce the contact area of cable and pipe wall, reduce the local temperature rise caused by heat generation due to friction, while the air gap between pipe wall and cable is more uniform, beneficial to the heat dissipation of cable operation, prolong the service life of cable, there is also a layer of nano calcium carbonate in it, nano calcium carbonate particle size is usually 10~100nm, specific surface area is large and dispersibility is good, uniformly filled in CPVC resin matrix can form "rigid particle reinforcing effect", the tensile strength of inner wall layer is improved by 20%~30%, and bending modulus is improved by 15%~25%.

The object is to provide a cover for a display device that is easy to attach and detach relative to the display device and does not cause the adhesive to adhere to and remain on the surface of the housing, and a package for a display device using the cover. The solution is that the cover (20) has a front plate portion (21) and a rear plate portion (22), and is provided with a left-side connecting tab (26) extending in the left direction from the rear plate portion (22) and a right-side connecting tab (27) extending in the right direction. The engaging inner surface of the re-peeling adhesive surface of the front plate portion (21) is adhered and engaged with the front surface of the transparent panel of the display device (1). The left-side connecting tab (26) and the right-side connecting tab (27) extend in the front direction, and the re-peeling adhesive surfaces, i.e., the engaging inner surfaces of the left-side connecting tab (26) and the right-side connecting tab (27), are adhered and engaged with the outer surface (21b) of the front plate portion (21).

The application discloses a deep-groove polysilicon etching solution, which comprises an oxidizing agent, an inorganic acid, a pH regulator and a surfactant. The deep-groove polysilicon etching solution can efficiently etch polysilicon while ensuring the uniformity and smoothness of the etching surface, and can maximize the consistency of the etching of the upper and lower grooves and the smoothness of the surface. In the etching process, the inorganic acid ensures that the etching solution system is in an acidic environment, and the polysilicon is etched; the pH regulator avoids the large fluctuation of the pH of the etching solution, thereby ensuring the stability of the polysilicon etching process; and the surfactant reduces the surface tension of the etching solution, improves the wettability of the etching solution, ensures the consistency of the etching rate of the upper and lower grooves, and ensures the consistency of the groove aperture.

The application relates to the technical field of dental implants, in particular to a trans-zygomatic implant and a processing technology thereof, and the processing technology comprises variable-distance multi-stage sand blasting and acid etching surface treatment on an anchoring part with threads of the trans-zygomatic implant and electrochemical polishing surface treatment on an extension part without threads. The trans-zygomatic implant is treated by variable-distance multi-stage sand blasting combined with acid etching, so that a uniform micron-level rough base and a multi-stage micropore structure can be formed on the titanium surface, osteoblast adhesion and differentiation are facilitated, the early bone combination speed is accelerated, the combination strength is improved, the early implant loosening risk is reduced, the extension part of the trans-zygomatic implant is treated by electrochemical polishing, a smooth surface can be obtained, plaque adhesion and bacterial colonization are greatly reduced, the implant peri-implantitis risk is reduced, and soft tissue adhesion is promoted; the dual optimization of bone anchoring and tissue adhesion is realized, and the long-term function and health of the trans-zygomatic implant under complex stress are guaranteed.

The utility model discloses a kind of high-strength high-conductivity steel-aluminum composite plate explosive welding block, it relates to explosive welding block technical field, including steel plate and aluminum plate, steel plate is located at the bottom of aluminum plate, the four corners of steel plate and the four corners of aluminum plate are all set with round angle, the upper surface of steel plate is set with multiple micron-level grooves, explosive welding connection between steel plate and aluminum plate;The bottom of steel plate is provided with buffer support plate.A kind of high-strength high-conductivity steel-aluminum composite plate explosive welding block of the utility model, by setting the several micron-level grooves of steel plate upper surface, in the fusion welding of steel plate and aluminum plate, the welding surface molten metal of aluminum plate can be infiltrated into several micron-level grooves, increase the "occlusal" force, improve welding strength, the multiple wave-shaped protrusions of aluminum plate lower surface, in explosion, can be inserted into steel plate upper surface, can form "mechanical lock catch" structure, increase interface friction, improve welding strength.

This invention discloses a release film for multilayer ceramic capacitors and its preparation method in the field of polymer composite materials. The release film uses polyethylene terephthalate as the matrix, combined with a bimodal nanoparticle system composed of specific spherical silica and alumina. It innovatively introduces a bifunctional modifier containing perfluoroalkyl and siloxane groups, as well as a hyperbranched multi-arm block polyester siloxane synergistic interface modifier. The preparation process includes key steps such as nanoparticle surface modification, functional masterbatch melt blending and extrusion, and biaxial stretching molding. Through the synergistic effect of the two special modifiers, the dispersibility of nanoparticles in the matrix is ​​significantly improved, and the interfacial bonding strength is enhanced. This results in a release film with extremely low surface roughness and excellent anti-adhesion properties, while also exhibiting good heat resistance and dimensional stability, fully meeting the requirements of high-end multilayer ceramic capacitor manufacturing processes.

This invention relates to the field of braking technology, and more specifically, to a high-sealing brake. It includes: a caliper assembly comprising a caliper body and a screw hole, the screw hole being formed within the caliper body; a screw assembly inserted into the screw hole; a bushing assembly, configured as an annular shape, the bushing assembly being disposed axially between the caliper body and the screw assembly along the screw hole; and a sealing assembly comprising a dynamic sealing portion and a static sealing portion; the dynamic sealing portion being disposed between the bushing assembly and the screw assembly, and abutting against both the screw assembly and the bushing assembly; the static sealing portion being disposed between the caliper body and the bushing assembly, and abutting against both the caliper body and the bushing assembly; the contact surface between the bushing assembly and the dynamic sealing portion is the bushing surface; the projection surface of the bushing surface onto the caliper body along the radial direction of the bushing assembly is the caliper body surface; the roughness of the bushing surface is less than the roughness of the caliper body surface; the braking state includes: the screw assembly rotating, causing the dynamic sealing portion to move relative to the bushing assembly. This solves the problem of poor brake sealing performance.

The application belongs to the technical field of heterogeneous steel additive manufacturing, and particularly relates to a kind of heterogeneous steel based on laser additive manufacturing and a preparation method of shell-like nacreous layer structure, the shell-like nacreous layer structure heterogeneous steel includes multiple layers of bionic heterogeneous structure layer, each layer of bionic heterogeneous structure layer includes multiple shell-like nacreous layer structure unit bodies, each shell-like nacreous layer structure unit body includes four square modules, each square module includes two long rectangular martensite steel regions and two long rectangular austenite steel regions which are parallel to each other, long rectangular martensite steel regions and long rectangular austenite steel regions are arranged at intervals, the direction of long rectangular martensite steel regions and long rectangular austenite steel regions in any two adjacent square modules in each layer of bionic heterogeneous structure layer is perpendicular, and the direction of long rectangular martensite steel regions and long rectangular austenite steel regions in any two adjacent square modules in any two adjacent layers of bionic heterogeneous structure layer is perpendicular, and the application realizes the synergy of strength and toughness of material.

The application relates to a CMP composition for obtaining a high-quality SiC single crystal substrate surface, which is prepared from the following raw materials in percentage by weight: 20-50 wt% of polishing abrasive, 3-5 wt% of oxidizing agent, 0.1-0.5 wt% of surfactant, 0.2-0.5 wt% of hydrogen bond regulator, 0.2-1 wt% of polishing accelerator, 0.01-0.05 wt% of defoaming agent, and the balance of water; the CMP composition is neutral. The CMP composition uses silicon oxide as the abrasive, introduces the hydrogen bond regulator, the polishing accelerator and the oxidizing agent, improves the polishing rate of the silicon carbide wafer CMP, realizes that the surface roughness Ra of the silicon surface after cleaning can reach below 0.07 nm, the surface after cleaning is free of large particles (>0.2 um), meanwhile, the silicon oxide raw material does not need to be treated, has excellent long-term storage stability, and the system does not have the phenomena of particle agglomeration and sedimentation with the prolongation of the storage time, and excellent polishing surface quality can be obtained in the subsequent polishing process.