400 results about "Micron scale" patented technology

The invention discloses a double-PHA barrier system for a paper-based container and a paperboard as well as a preparation method and application of the double-PHA barrier system, and belongs to the technical field of paper-based material surface engineering and green packaging. The system sequentially comprises a paper base material, a water-based PHA dispersion hole sealing layer and a PHA extrusion compact layer from inside to outside. According to the invention, the micron-sized PHA dispersoid without cell debris is utilized, so that an efficient hole sealing effect which is difficult to achieve by a high coating amount in a traditional process can be achieved by only needing an extremely low coating amount, and the pinhole defect of an extrusion layer is eliminated from the source. And in cooperation with the modified PHA extrusion layer with the specific crystallinity, the problem of micro-cracking of a single coating during edge rolling forming is cooperatively solved. According to the system, excellent barrier performance is achieved through a thinner bio-based structure, and meanwhile the system has a wide heat sealing window and excellent repulp recycling performance. Compared with the prior art, on the premise that high performance is guaranteed, the consumption amount of packaging materials and the environmental burden are remarkably reduced.

The invention discloses a super-amphiphobic flame-retardant ice-resistant coating as well as a preparation method and application of the super-amphiphobic flame-retardant ice-resistant coating with a multi-layer surface coating, and belongs to the technical field of functional materials of electrical equipment. The coating comprises micron-sized ammonium polyphosphate, a nano-sized inorganic filler, fluorinated alkyl silane and a fluorine surfactant, the super-amphiphobic, flame-retardant and ice-resistant coating is constructed through multi-scale components, and the super-amphiphobic, flame-retardant and ice-resistant coating is spontaneously assembled on the surface of a base material in the coating process to form a coating surface with a molecular nanometer, micrometer and macroscopic multi-level structure; the coating shows good super-amphiphobic characteristics, the contact angle of the structure surface after long-time placement under the room temperature condition is basically kept unchanged, the contact angle to water and oil is still larger than 150 degrees after multiple times of cyclic friction and washing, meanwhile, the coating has excellent flame retardance, ice resistance and wear resistance, the icing delay time is greatly prolonged, and the coating has the good anti-freezing effect. And no open fire is generated when the cable is in contact with an external fire source, so that the cable has important engineering application value for electric power facilities under harsh environmental conditions.

The invention provides a film layer thickness uniformity detection method and system, and the method comprises the steps: providing a substrate which is provided with a to-be-detected film layer; scanning the thickness of the to-be-detected film layer and generating detection information; the thickness uniformity of the to-be-detected film layer is detected in a multi-azimuth mode according to various data obtained from the detection information, and the method comprises the steps that at least two thickness curves of the to-be-detected film layer are obtained according to the detection information, and the thickness curves are parallel to the scanning direction; and comparing the plurality of obtained thickness curves, and judging whether the thickness uniformity of the to-be-detected film layer reaches the standard or not according to a comparison result. According to the film layer thickness uniformity detection method and system provided by the invention, micron-sized defects in the transparent material film layer can be detected, and meanwhile, the spraying state of the film layer can be confirmed and judged according to the detected defects.

The application discloses a kind of microspheroidal high-entropy spinel type ferrite wave-absorbing materials and preparation method thereof, belong to electromagnetic wave absorbing material technical field, the preparation method includes with the designed molar ratio six metal nitrate is weighed and dissolved in deionized water, then add ammonium fluoride, urea, after stirring, the obtained solution is hydrothermal reaction at a certain temperature for a certain time to obtain precursor, the precursor is calcined to obtain microspheroidal high-entropy spinel type ferrite.The obtained wave-absorbing material is single-phase spinel structure, micron-sized spherical morphology, its chemical formula is MFe2O4;Wherein M=Co, Ni, Cu, Zn, Cr.The microspheroidal high-entropy spinel type ferrite wave-absorbing material and preparation method thereof are used, and the performance of pure ferrite wave-absorbing material can be effectively improved, with the characteristics of simple preparation, strong absorption performance, absorption frequency bandwidth.

The invention relates to the technical field of radiation refrigeration films, and discloses a porous polyvinylidene fluoride based composite radiation refrigeration film and a preparation method thereof. The method comprises the following steps: firstly, carrying out melt blending on PVDF, NaCl and ZnO nanoparticles and forming a film, then dissolving out NaCl through water washing, and constructing a continuous three-dimensional porous structure in a PVDF matrix; and immersing the obtained porous PVDF / ZnO membrane material into a methanol aqueous solution containing 2-methylimidazole, so that ZnO is subjected to a coordination reaction at the pore wall and is converted into the ZIF-8 nanocrystal in situ. In the thin film prepared by the steps, the micron-sized salt-induced pore structure, the nano-sized ZIF-8 particles and the interface of the ZIF-8 particles jointly form a multi-stage scattering network, so that the scattering ability of the thin film in the solar spectrum range of 0.25-2.5 microns can be remarkably enhanced, the high infrared emission performance of the PVDF matrix in an atmospheric window of 8-13 microns is maintained, and the thin film has high solar reflectivity and high infrared emissivity, and can be used for preparing the solar film. An excellent radiation refrigeration effect can be achieved, and the heat-dissipating material is suitable for being applied to building outer surfaces, equipment heat dissipation, individual heat management and the like.

The invention belongs to the technical field of rivet-free bonding, discloses a CNN-Transform-based mechanical property prediction method for a rivet-free bonded joint, and aims to solve the problems that the existing mechanical property detection of the rivet-free bonded joint needs a destructive test, the prediction efficiency is low, and the prediction precision is insufficient. The method comprises the following steps: firstly, acquiring micron-scale and nano-scale morphology images of an upper plate and a lower plate of a rivet-free bonded joint through a white light interference microscope and an atomic force microscope, and completing standardized pretreatment; feature re-calibration is completed through a double-plate cross-scale interaction attention enhancement module, depth features are extracted through a four-branch CNN, and global association is established through cross-plate interaction Transformer; and finally, predicting the maximum peak load and failure displacement of the joint under the tensile shear working condition through the multi-regression head optimized by the same variance uncertainty loss. The method has the advantages of low prediction cost, high prediction efficiency, accurate precision and the like.

The invention relates to a copper-aluminum composite plate and a preparation method thereof, and belongs to the technical field of metal composite materials. The preparation method comprises the following steps: S1, carrying out microstructuring treatment on the surface of a copper plate to form a rough structure formed by micron-sized pits and bulges on the surface of the copper plate to obtain a microstructured copper plate; s2, depositing a zinc intermediate layer on the surface of the microstructured copper plate through a magnetron sputtering technology to obtain a galvanized copper plate; s3, the zinc middle layer of the galvanized copper plate is attached to the aluminum plate, and the copper-aluminum composite plate is obtained through hot pressing, rolling and heat treatment in sequence; the copper-aluminum composite board has excellent interface bonding strength and toughness.

The application provides a preparation method of laser additive manufacturing crack-free Ni3Al-based high-temperature alloy, comprising the following steps: (1) uniformly mixing micron-sized Ni3Al-based high-temperature alloy powder and nano Hf ceramic particles, so that the nano Hf ceramic particles are uniformly wrapped on the surface of the micron-sized Ni3Al-based high-temperature alloy powder, to obtain a composite powder; (2) drying the composite powder; (3) layer-by-layer melt forming the composite powder by using a laser directional deposition device, to obtain the laser additive manufacturing crack-free Ni3Al-based high-temperature alloy. The application also provides the laser additive manufacturing crack-free Ni3Al-based high-temperature alloy prepared by the method. The preparation method of the laser additive manufacturing crack-free Ni3Al-based high-temperature alloy can prepare the crack-free Ni3Al-based high-temperature alloy by the laser additive manufacturing method, and is simple in preparation and low in cost.

The invention relates to the field of semiconductor device and integrated circuit research, in particular to a semiconductor device dose rate effect laser simulation system. Multiple wavelengths and a wide energy range are achieved through the optical fiber laser pulse seed source assembly and the solid laser amplifier assembly, the pulse width can range from 1 ns to 100 microseconds, variable complex waveforms such as square waves, rectangular waves, sine waves and pulse strings are achieved, and pulse laser with the energy range from the nanojoule level to the joule level and adjustable wavelengths and waveforms can be output according to requirements. The high-low energy laser adopts a common-path design, so that the system integration degree is improved; light spots are adjustable from centimeter level to micron level, and global irradiation and micro-area positioning and scanning of an irradiation sample can be realized. According to the invention, dose rate effects under different conditions can be accurately and flexibly simulated, the blank of a high-energy, variable-waveform and multi-wavelength dose rate effect laser simulation system is filled up, and an efficient solution is provided for the reliability research of devices under a complex irradiation environment.

The invention discloses a preparation method of a metal surface micro-pattern texture, and belongs to the technical field of metal materials and machining thereof. The method comprises the following steps: S1, depositing a metal shading layer on a monocrystalline silicon wafer and patterning, spin-coating a polysiloxane precursor, curing and stripping to prepare a flexible transparent photoetching template; s2, conformally attaching a template to the cleaned bent metal surface, and performing ultraviolet exposure and development to form a cured photoresist mask; and S3, the metal workpiece with the mask serves as an anode, the metal workpiece with the mask is placed in HF-HCl mixed electrolyte for electrochemical etching, the voltage is controlled to be 2.0-5.0 V, the time is 2-8 min, and the micron-sized surface texture of 0.5-2.5 microns is obtained. And the thickness of the template is 0.3-3.0 mm, so that the template can adapt to metal surfaces with different curvature radiuses. According to the method, the photoetching-electrochemical etching process is successfully extended to the curved metal surface for the first time, the pattern fidelity is high, the texture depth is controllable, and the method can be widely applied to key parts, needing mechanical sealing and lubricating, of a carrier vehicle body.

The invention discloses a method for industrially producing a micro-particle conductive aggregate. The method comprises the following steps: pretreating glass beads to obtain a micron-sized rough surface; preparing conductive paste containing large-particle graphene and water-based acrylic resin; at least three continuous spraying fluidized beds which are connected in series are adopted, and the surfaces of the microbeads are coated with bonding layers, conductive layers and protective layers in sequence; and finally, continuous curing and screening are carried out. According to the method, efficient, continuous and large-scale production of the conductive aggregate is achieved, and the problems that graphene is prone to agglomeration and uneven in dispersion and the coating binding force of a traditional process is poor are effectively solved. The obtained conductive aggregate is excellent in conductivity, good in solvent resistance, high in adhesive force and suitable for the fields of anti-static mortar, resin self-leveling materials, coatings and the like.

The application discloses a preparation method of a high-wear-resistance railway turnout coating and relates to the technical field of railway turnout coatings. A surface grafted modified nano tungsten carbide reinforcing phase is formed; a nano composite pre-alloy powder is obtained; a spherical high-entropy alloy composite spraying powder with high fluidity is obtained; a rough anchoring surface with a micron-level staggered grid structure is constructed on the surface of a base material; a base coating substrate with a thermal expansion gradient buffer feature is obtained; an initial cladding coating workpiece is obtained; and the high-wear-resistance railway turnout coating is prepared. The application excludes closed pores in the powder, and significantly improves the density and fluidity of the powder.

The application discloses a magnesium-based composite material and a preparation method and application thereof. The magnesium-based composite material comprises ferroferric oxide and a magnesium alloy. The magnesium alloy comprises the following components in percentage by weight: 3wt.%-6wt.% of Zn, 0.3wt.%-0.8wt.% of Ca, and the rest of Mg and inevitable impurities. The magnesium-based composite material can effectively solve the problem that micron-sized particles are easy to agglomerate in a metal liquid when the magnesium alloy is modified, and the plasticity of the alloy is reduced and the alloy is not easy to be formed.

The invention provides a preparation method of a graphene film with high thermal conductivity in a Z-axis direction, the graphene film with high thermal conductivity in the Z-axis direction and application of the graphene film, and relates to the technical field of graphene. The preparation method comprises the following steps: carrying out air crushing treatment on low-solid-content graphene oxide slurry to enable micron-sized air bubbles to be attached to the surface of a sheet layer of graphene oxide, so as to obtain low-solid-content gas-dissolved graphene oxide slurry; preparing the low-solid-content dissolved gas graphene oxide slurry into high-solid-content dissolved gas graphene oxide slurry; carrying out homogenizing and stripping treatment on the high-solid-content gas-dissolved graphene oxide slurry to obtain homogenized graphene oxide slurry; the homogenized graphene oxide slurry is subjected to coating, drying and heat treatment in sequence, and the graphene film with the high thermal conductivity in the Z-axis direction is obtained. According to the preparation method disclosed by the invention, the tiling order of the graphene sheet layers in the X-Y direction is broken, and the cardinal number of the graphene sheet layers arranged in the Z-axis direction is increased, so that the heat-conducting property in the Z-axis direction is improved.

Methods and systems are disclosed that enhance the yield and speed of emission and control the spectral and angular emission of light emitted by materials under irradiation by high-energy particles through a process known as scintillation. In each case, a photonic structure (of nano- or micron-scale feature sizes) is integrated with a scintillating material, and the photonic structure enhances the yield or controls the spectrum of the material. Various embodiments of this technology and practical demonstrations are disclosed.

The invention provides a simple, reliable, convenient and feasible sample preparation method for fully exposing excess crystal phase particles at different positions in an aluminum alloy deformed material. The technical problem that ultrasonic flaw detection, three-dimensional metallographic structure observation and other means cannot accurately and objectively measure and analyze the spatial distribution characteristics of the micron-sized crystal phase particles in the deformed aluminum alloy material is solved, and the measurement and analysis method for judging whether the crystal phase particles are aggregated and distributed or not is provided. The invention provides a statistical calculation method for evaluating the distribution uniformity of crystal phase particles. By utilizing the technical means of the invention, the spatial distribution characteristics of the excessive crystal phase particles in the aluminum material can be efficiently and accurately determined and analyzed, and the method can be used for further optimizing the spatial distribution characteristics of the excessive crystal phase particles in the aluminum material by virtue of a reasonable process regulation and control means. The necessary, objective and accurate method for obtaining the spatial distribution characteristic parameter data of the excessive crystal phase particles is provided for finally greatly improving the comprehensive performance of the aluminum material.

The invention provides a device for assisting packaging and column planting of a ceramic column grid array and a manufacturing method of the device, and relates to the field of microelectronic packaging manufacturing and assembling. The problems that according to an existing column planting device, a resin piece is prone to deformation at high temperature, a metal piece and ceramic thermal expansion are not matched, stress warping is prone to being generated, welding column positioning precision and perpendicularity are insufficient, multi-specification chips are poor in universality, and high-temperature stability and micron-level positioning are difficult to consider at the same time are solved. According to the invention, the rigid-flexible coupling structure of the AlSi10Mg aluminum alloy shell and the resin plug board with the temperature resistance of not less than 210 DEG C is adopted, and the double-layer boss and the through hole array are matched, so that the precise positioning of the welding column is realized, chips of multiple specifications are adapted, and high-temperature stability and micron-sized alignment are both considered.

This invention relates to the preparation technology of two-dimensional material composites, specifically a method for coating two-dimensional materials onto the surface of non-metallic particles based on a high-temperature growth process. This method is suitable for the large-scale preparation of continuously coated non-metallic particulate materials. The invention employs a three-step method to form continuously coated two-dimensional materials on the surface of non-metallic particles: First, a continuous metal catalyst coating layer with a nanometer-thickness is formed on the surface of the non-metallic particles; then, the coated non-metallic particles are mixed with micron-sized powder of the same metal catalyst composition; next, a continuously coated two-dimensional material film is grown on the surface of the non-metallic particles using a high-temperature catalytic reaction; finally, the metal catalyst is removed, yielding the two-dimensional coated non-metallic particulate material. This invention can achieve the formation of two-dimensional material coating layers on the surface of a large number of non-metallic particles. The two-dimensional materials exhibit continuous, non-overlapping microstructures, high coating rates, and high crystallinity. Furthermore, this method is easily scalable.

This invention relates to the field of micro / nano-structure-enhanced heat transfer surfaces, providing a 3D printing-assisted method and product for fabricating multi-scale three-dimensional metal surface structures. The method includes: fabricating a micron-level high-precision three-dimensional structure mask using 3D printing technology; the three-dimensional structure mask includes a cutout portion and a body portion; the cutout portion matches a three-dimensional structure model; performing material conversion on a metal substrate with the three-dimensional structure mask fixed thereon to obtain a target metal, wherein the metal substrate may be machined beforehand; the target metal surface has a three-dimensional structure matching the three-dimensional structure model. The 3D printing-assisted method for fabricating multi-scale three-dimensional metal surface structures provided by this invention improves the precision of the metal structure by increasing the precision of the template, fabricating multi-scale, multi-material heat transfer structures with micron-level precision and complex structures on the metal surface, thereby improving the metal phase change heat transfer efficiency.

The invention discloses a lens flexible adjusting frame with nanoscale precision, and belongs to the technical field of optical adjusting equipment. The lens flexible adjusting frame comprises a fixed plate, a through groove formed in the fixed plate, a movable plate arranged in the through groove, and a flexible hinge arranged on the outer side of the movable plate and connected with the inner side of the through groove. The stacked micron-scale piezoelectric ceramic actuators are respectively arranged on three planes which are uniformly distributed at 120 degrees along the circumferential direction of the outer edge of the fixed plate and are used for realizing translational motion of the movable plate in three directions in an XY plane; the large sealing plates and the small sealing plates are respectively and fixedly arranged on the two sides of the fixed plate and three planes which are uniformly distributed at 120 degrees along the circumferential direction of the outer edge of the fixed plate; the lens flexible adjusting frame further comprises flexible hinges which are arranged on the fixed plate and the movable plate and used for improving the moving precision of the movable plate. According to the novel lens flexible adjusting frame, the movable plate can slightly and accurately move in three directions in an XY plane through accurate control of the piezoelectric ceramics which are uniformly distributed on three planes at 120 degrees in the circumferential direction, so that the adjustment of the lens can reach nanoscale precision.

The invention discloses a manufacturing method of a high-power photovoltaic module, and aims to solve the technical problems that specular reflection on the lower surface of glass of an existing crystalline silicon photovoltaic module causes light loss, the utilization rate of ultraviolet light is low, and aging of a packaging adhesive film is easily accelerated. The method comprises the following steps: firstly, carrying out hydrofluoric acid etching or micron-order fusion embossing treatment on the lower surface of photovoltaic front glass to form a concave-convex light trapping structure so as to reduce mirror reflection of incident light; the upper surface of the glass is coated with a polyfluorene down-conversion material layer with the thickness of 50-100 nm, and ultraviolet light is converted into high-responsivity blue light. Subsequent procedures of cell scribing, multi-main-grid series welding, POE adhesive film lamination, EL and appearance detection, vacuum lamination, trimming and framing and the like are carried out to complete assembly preparation. Tests show that in a 66-version assembly, only the lower surface of the glass is treated, so that the power can be improved by 2.1 W compared with that of a traditional process, the power is improved by 5.8 W after the lower conversion film layer is overlaid, meanwhile, the aging effect of ultraviolet light on the adhesive film is weakened, the service life of the assembly is prolonged, and the process is compatible with an existing production line and has remarkable industrial application value.

The invention discloses a flexible micro-nano cross-scale integrated metasurface single-cell sensor and a preparation method thereof, and relates to the field of biosensing. The sensor comprises a PDMS flexible substrate layer, a micro-nano cross-scale structure layer and a gold metal film layer, the micro-nano cross-scale structure layer adopts a nesting design of a micron-scale single cell capture unit and a nano-scale plasmon structure, so that single cell precise limiting and local electromagnetic field multi-stage enhancement are realized, and the problems of poor adaptability and low sensitivity of a traditional rigid sensor are solved. According to the preparation method, a silicon-based template-replication forming-magnetron sputtering process is adopted, a silicon template is prepared through deep ultraviolet lithography and deep reactive ion etching, a gold film is deposited after a flexible micro-nano structure is copied by PDMS, and large-scale mass production of the sensor is realized. The sensor has excellent flexibility, biocompatibility and high detection sensitivity, can realize single cell level accurate and in-situ detection, is suitable for the scenes of early disease screening, cell biological analysis, personalized medical treatment and the like, and is simple in process and low in cost.

The invention discloses a micron-sized metal organic framework nanosheet, the micron-sized metal organic framework nanosheet is 2D-Cu (NDI-NHEt) NSs, the thickness of the micron-sized metal organic framework nanosheet is 1.3 nm, and the transverse size of the micron-sized metal organic framework nanosheet is micron-sized. Compared with the prior art, the method has the advantages that the method has the characteristics of high crystallinity, ultrathin thickness (about 1.3 nm) and abundant functional units, has the advantages of simple process, convenience in operation, suitability for batch production and the like, and provides reference for MOFs structural design and nanosheet preparation thereof.

The invention discloses a TPU bead foaming material with an easy-to-clean wear-resistant coating, which comprises a TPU bead foaming base material and the easy-to-clean wear-resistant coating arranged on the surface of the base material, and the easy-to-clean wear-resistant coating comprises a bottom coating, a middle coating and a surface coating which are sequentially arranged on the surface of the base material, the bottom coating is a compound coating of water-based acrylate and water-based polyurethane, has good compatibility with a base material, and forms a network structure through cross-linking of a cross-linking agent and a curing agent, so that the adhesive force, the flexibility, the strength and the wear resistance of the coating are ensured; the micron-scale filler in the bottom coating and the nano-scale filler in the middle coating form a gradient filling structure, so that the surface of the coating is more compact and smoother, and is not easy to contaminate and hide; fluorocarbon resin in the surface coating endows the base material with excellent stain resistance, easy cleaning and weather resistance; hardness gradient is formed between the coatings, and internal stress generated due to too large hardness difference between the coatings is reduced.

The application belongs to the field of aluminum-based composite materials, and particularly relates to a kind of additive manufacturing high-performance aluminum-titanium metal composite material and a preparation method thereof. Micron-sized aluminum alloy powder and micron-sized titanium alloy powder are mixed uniformly by ultrasonic-assisted water bath stirring method for laser powder bed melting, wherein the mass fraction of the aluminum alloy powder and the titanium alloy powder is 85-98 wt.% and 2-15 wt.% respectively. The micron-sized titanium alloy powder is used to promote the formation of multi-scale layered structure of equiaxed crystal, core-shell structure, cellular substructure and nano precipitate phase, so as to simultaneously improve the strength and plasticity of the material and realize isotropic mechanical properties. The aluminum alloy-titanium metal composite material for additive manufacturing disclosed by the application has simple and easy-to-control process and low cost, and can be suitable for large-scale production.

The application relates to the field of TO package chip detection devices. A To package chip detection device comprises a jig transfer module and a visual detection module; the jig transfer module comprises a jig servo motor, a transfer first guide rail and an R-axis module; the R-axis module is connected to the transfer first guide rail through a sliding block, and a product jig for placing products is arranged on the R-axis module; the jig servo motor can move the product jig to below the visual detection module; the visual detection module comprises a first light source, a first lens, a defect detection first camera and a detection mounting plate arranged in sequence on the same straight line; the resolution of the defect detection first camera can reach 4096*3000, and the pixel accuracy is 0.0030-0.0057 mm / pixel; the distance L from the first lens to the product is 110+ / -10 mm, the distance L1 from the first lens to the first light source is 59.5+ / -20 mm, and the distance L2 from the first light source to the product is 30+ / -20 mm. The device has the advantages of being capable of detecting micron-level defects and high detection efficiency.

The present application relates to a kind of intelligent detection method and detection system of surface coating micron-sized pore, scheme as follows: obtain coating surface image to be detected and execute standardization preprocessing;Preprocessing image is input into trained hole profile segmentation model, and hole profile coordinates are obtained;Based on hole profile coordinates, construct hole connected region by morphological operation, and according to geometric feature, Gap region that does not need to be punched is screened;Preprocessing image is input into trained missed hole detection model, and real missed hole region is obtained;According to hole profile coordinates, calculate geometric feature parameter, determine collapse hole and calculate hole distribution density, finally output detection quality result.The present application realizes the high-precision, automation detection of micron-sized pore by the combination of deep learning model and morphological operation, geometric parameter calculation, solves the inherent defects of artificial detection, meets the high consistency, large batch fast control demand of modern manufacturing industry to surface coating quality.

The application relates to a high-quality wafer-level single-crystal multilayer boron nitride film and a controllable preparation method and application thereof, and belongs to the field of two-dimensional film materials. The application aims to solve the technical problems that the size of the boron nitride film obtained by the existing method can only reach the micron level and the growth orientation is inconsistent. The application adopts a CVD process, places a liquid growth substrate in a growth area, places a solid source in a source area, carries out film growth under a reducing atmosphere, controls the number of layers of the single-crystal boron nitride film by controlling the growth time, and obtains the high-quality wafer-level single-crystal multilayer boron nitride film. The preparation method of the application can realize the layer number control of the boron nitride film by simply changing process parameters, the wafer-level film grown is uniform in layer number, the layer number in different areas is consistent, the roughness is low, the controllability is good, and the layer number controllable preparation of the single-crystal boron nitride film is realized by accurately controlling the growth time.

This application relates to the technical field of plastic coloring, and in particular to a low-gelling carbon black polymer and its preparation method. The low-gelling carbon black polymer comprises the following raw materials in weight percentages: HDPE 5-15%, carbon black 10-40%, carbon nanotubes 3-7%, flake graphite 1.5-4%, processing aids 1-4%, antioxidant 0.2-0.6%, with the balance being mLLDPE. The carbon nanotubes are a mixture of short-tube and long-tube MWCNTs. The average diameter of the short-tube MWCNTs is 8-15 nm, and the average length is 5-20 μm. The average diameter of the long-tube MWCNTs is 20-50 nm, and the average length is 100-300 μm. The flake graphite is micron-sized flake graphite. It has the advantage of reducing "gelling" during the later storage process of the carbon black polymer.

The invention relates to the technical field of spraying materials, in particular to ceramic powder for spraying and a preparation method thereof. The ceramic powder for spraying comprises the following components in percentage by weight: 6.0%-8.5% of Y2O3 in a yttria-stabilized zirconia matrix, 0.5%-1.5% of ZrO2 in the yttria-stabilized zirconia matrix, 0.5%-1.5% of ZrO2 in the yttria-stabilized zirconia matrix, and 1.0% to 12.0% of nano-scale Al2O3 (aluminum oxide); 0.5%-6.0% of nano-scale Y2O3 (yttrium oxide); wherein the primary particle size of the nanoscale Al2O3 is 20 nm to 100 nm, and the primary particle size of the nanoscale Y2O3 is 20 nm to 100 nm; the ceramic powder is micron-sized spherical particles obtained through spray granulation and heat treatment, and in the micron-sized spherical particles, nano-sized Al2O3 and nano-sized Y2O3 are wrapped and uniformly dispersed in a yttria-stabilized zirconia matrix to form an inner composite structure. According to the ceramic powder for spraying, provided by the invention, the mechanical property and high-temperature stability of a coating are enhanced essentially. The nanometer materials are packaged in the micron spherical particles in advance, the industrialization problems that pure nanometer powder is poor in fluidity and difficult to convey are solved, and the nanometer powder can be compatible with existing plasma spraying equipment.