1515 results about "Surface coating" patented technology

The invention relates to a material that is at least partially transparent and that has structures introduced into its internal volume after material production, which modify the volume with respect to its optical properties compared to the unstructured volume. The material according to the invention is characterized by its formation as an at least partially transparent surface coating, wherein the structure comprises modification bubbles that are formed in at least one plane within the volume.

The invention relates to the technical field of decorative materials, in particular to a decorative material with a 3D texture structure and a preparation method and application of the decorative material. The method comprises the following steps: carrying out digital printing on a pretreated substrate to obtain a 2D pattern layer on the surface of the substrate; coating the surface of the 2D pattern layer with a photocuring coating, carrying out preliminary curing, and then carrying out ink-jet printing of a texture developing solution on the surface subjected to preliminary curing to carry out secondary curing, so as to obtain a cured coating; the cured coating comprises a hardened part and an unhardened part; and after an unhardened part in the cured coating is removed through polishing and wire drawing, a surface coating is coated, and the decorative material with the 3D texture structure is obtained. The textures with different widths and depths can be obtained in a manner of combining primary curing of the coating with ultraviolet absorption of the developing solution, and then a microcosmic coarse and visual smooth form is obtained through polishing and wire drawing treatment, so that the obtained 3D texture structure is closer to natural textures.

The invention relates to the technical field of surface spraying, in particular to an intelligent surface spraying method and device based on coating quality and a spraying robot. The intelligent surface spraying method based on the coating quality comprises the steps that the coating actually-measured thicknesses of a plurality of detection points in a spraying width area are monitored in real time, and an actually-measured thickness distribution field is obtained; according to the actually measured thickness distribution field and the target thickness of the coating, a thickness deviation mean value is calculated, and whether the thickness deviation mean value is out of an allowable range or not is judged; if yes, calculating a thickness standard deviation according to the actually measured thickness distribution field; calculating a speed correction amount according to the thickness deviation mean value and the speed correction coefficient; and according to the thickness deviation mean value, the thickness standard deviation and the spraying width correction coefficient, the spraying width correction amount is calculated. According to the intelligent surface spraying method and device based on the coating quality and the spraying robot, the product surface coating spraying effect standard reaching rate is high, the secondary machining number can be greatly reduced, and the productivity is high.

The utility model discloses a thickness measuring device for a surface coating of a battery cell, and belongs to the technical field of detection tools. The device comprises a thickness detection assembly and a carrying assembly which are arranged on a platform, the thickness detection assembly is provided with a height adjusting device, and the height adjusting device is provided with a photoelectric sensor used for detecting the thickness of a coating on the surface of a battery cell; the carrying assembly is in sliding connection with the platform, and the carrying assembly is used for conveying a to-be-detected battery cell to the photoelectric sensor and detecting the thickness of a surface coating of the battery cell; according to the utility model, the height adjusting device and the carrying assembly are matched with the photoelectric sensor, so that the thickness of the surface coating of the cylindrical battery cell is detected in a non-contact manner, and the production quality of the battery cell is improved.

The invention discloses base paper for aluminum spraying and a preparation method thereof, and relates to the technical field of base paper. The preparation method comprises the following steps: pulping softwood pulp, then adding deionized water to dilute the softwood pulp until the mass concentration is 0.8%-1%, then adding modified gel particles, modified bentonite and a PAE wet strength agent, adjusting the pH value to 6.5-7.5, stirring for 40-60 minutes, and then adding deionized water to dilute the softwood pulp until the mass concentration is 0.5%-0.7% to obtain mixed paper pulp; and then making the mixed paper pulp into paper sheets, squeezing, drying, coating the surface layer coating on the surface of base material paper, and drying with hot air to obtain the body paper for aluminum spraying. According to the invention, the modified gel particles and the modified bentonite are added, so that the mildew-proof and moisture-proof capabilities of the base paper for aluminum spraying are effectively improved; the introduction of the surface coating further improves the mildew-proof and moisture-proof capabilities. Therefore, the method has a wider application prospect.

The invention discloses a ternary positive electrode material, a preparation method thereof and an electrochemical device. The preparation method comprises the following steps: mixing a continuous ternary precursor, a lithium source and an aluminum source, and carrying out first sintering to obtain a first sintered product; the primary sintering product is subjected to secondary sintering and dispersion, a single-crystal base material is obtained, the base material comprises a plurality of primary particles, the average size of the primary particles ranges from 2 micrometers to 3 micrometers, and the median particle size Dv50 of the primary particles ranges from 3 micrometers to 5 micrometers; mixing the matrix material with an aqueous solution of lithium phosphate, and carrying out wet coating to obtain a coated product; and sintering the coated product for the third time, so that the lithium phosphate forms a coating layer on the surface of the matrix material, and the ternary positive electrode material is obtained. According to the invention, through two-parameter control of the average size and the median particle size of the matrix material and simultaneous aluminum element internal doping and lithium phosphate surface coating of the matrix material, the structural stability and the cycle performance of the ternary positive electrode material are improved and the service life of the ternary positive electrode material is prolonged through a synergistic effect.

The invention belongs to the technical field of back contact cells, and particularly relates to a back contact cell manufacturing method for improving passivation performance and a back contact cell thereof, and the method comprises the steps: S2, depositing a first semiconductor layer and a phosphorosilicate glass layer on the back surface of a silicon wafer, and reserving the first semiconductor layer and the phosphorosilicate glass layer as a first mask layer; s3, performing texturing cleaning on the front surface of the silicon wafer; the first mask layer is removed in the final cleaning process after texturing; s4, forming a passivation layer and an anti-reflection layer on the front surface of the silicon wafer; s5, coating the back surface to form a second mask layer; s6, forming a second semiconductor opening region; and S7, texturing or polishing the second semiconductor opening area on the back surface, and cleaning by using an HF solution with the mass concentration of 0.5%-5% to remove the second mask layer and the winding plating layer generated in the front surface coating process in the S4. The back surface winding plating layer does not need to be removed, damage to the first semiconductor layer and the front surface film layer can be avoided, the overall passivation level can be improved, and therefore the battery efficiency is improved.

The invention belongs to the technical field of denitration catalysts, and discloses a CO-SCR denitration catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) putting honeycomb cordierite into a muffle furnace for preliminary calcination to obtain a carrier; (2) immersing the carrier into a mixed solution containing an aluminum source and an alkaline nitrogen source for hydro-thermal treatment, taking out the carrier after hydro-thermal treatment, and washing and drying to obtain a surface modified carrier; (3) preparing a bottom layer coating solution containing catalyst powder and a first pore-forming agent; preparing a surface layer coating solution containing catalyst powder and a second pore forming agent; wherein the average particle size of the first pore-forming agent is larger than that of the second pore-forming agent; (4) immersing the surface modified carrier into the bottom layer coating liquid for coating, carrying out primary drying, then immersing the surface modified carrier into the surface layer coating liquid for coating, and carrying out drying treatment to obtain a catalyst precursor; and (5) calcining the catalyst precursor to obtain the CO-SCR denitration catalyst.

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 discloses an AlCrN / AlCrSiWN nano multilayer composite coating with ultrahigh hardness and a preparation process of the AlCrN / AlCrSiWN nano multilayer composite coating, and belongs to the technical field of material surface coatings. The composite coating comprises an AlCrN transition layer, an AlCrN / AlCrSiWN nano multilayer modulation coating and an AlCrSiWN functional layer which are sequentially deposited on a substrate, the AlCrN / AlCrSiWN nano multilayer modulation coating is formed by alternately overlapping AlCrN layers and AlCrSiWN layers, the modulation period is 5-200 nm, and the modulation ratio of the AlCrSiWN layers to the AlCrN layers is 1: (1.5-5). The coating is prepared by adopting an arc ion plating technology. According to the preparation method, the AlCrN / AlCrSiWN nano multilayer composite coating with ultrahigh hardness is prepared by alternately depositing the AlCrSiWN coating and the AlCrN coating, and the hardness and the toughness of the coating are synchronously improved.

An automatic spraying device for a surface coating of a special-shaped ceramic component relates to the technical field of surface spraying equipment and comprises an integrated electric cabinet, a spraying workbench is fixed to the upper surface of the integrated electric cabinet, and a feeding and discharging conveying assembly, a vacuum positioning assembly, a surface pretreatment assembly, a self-adaptive spraying assembly and a drying and curing assembly are arranged on the spraying workbench; the feeding and discharging conveying assembly comprises a transversely-sliding transfer conveying base. A plurality of feeding conveying rollers and a plurality of discharging conveying rollers which are the same in number are arranged on the two transverse sides of the transfer conveying base correspondingly. The vacuum positioning assembly comprises a vacuum adsorption mold which is rotationally arranged, the vacuum adsorption mold is a conical mold which is gradually shrunk from bottom to top, and a T-shaped vacuum adsorption runner is formed in the vacuum adsorption mold. The device solves the problems that when a traditional special-shaped ceramic component is subjected to spraying processing, the automation degree is low, the special-shaped adaptation and positioning performance is poor, the spraying precision is difficult to control, the coating adhesive force is weak due to incomplete pretreatment, equipment is difficult to maintain and debug, and the adaptability is poor.

The invention discloses a fireproof coated pipe as well as a preparation method and application thereof, and relates to the field of organic composite materials. The fireproof coated pipe comprises a mother blank material and a liquid waterproof agent, wherein the mother blank material comprises a flame-retardant polymer matrix, coated graphite and a heat-conducting filler; the coated graphite is formed by expanded graphite and a coating layer on the surface, and the coating layer comprises a silicon source and a phosphorus source. The surface of the expanded graphite is coated with the silicon dioxide-phosphide composite material, so that the compatibility of the filler and a specific type of flame-retardant polymer matrix can be improved, the addition amount of the heat-conducting filler is reduced to ensure uniform dispersion, and synergistic multiplication of a flame-retardant function and optimization of a heat-conducting network are realized; meanwhile, a specific type of liquid waterproof agent is introduced and is extruded and blended with the master batch, so that the material is endowed with excellent waterproofness, meanwhile, the compatibility with other core properties is ensured, the waterproof coated pipe material with efficient heat conduction, flame retardance, waterproofness and mechanical strength is provided, and the application field is expanded.

The invention relates to the technical field of coating detection, in particular to metal workpiece surface coating detection equipment which comprises a cross-cut knife and further comprises a guide rail, a connecting beam, a sliding part and a supporting part, the cross-cut knife is arranged below the connecting beam, the connecting beam is arranged on a guide groove of the guide rail through the sliding part, and the supporting part is arranged below the guide rail. According to the metal workpiece surface coating detection equipment, a biform fixing assembly is arranged on the inner side of the supporting piece, the biform fixing assembly is provided with a fixed block and a movable block so as to clamp and position a metal workpiece, the adhesive force of a surface coating can be conveniently tested, and according to the metal workpiece surface coating detection equipment, self-adaptive positioning of the workpiece is achieved by arranging the structure of the biform fixing assembly; the fixed block and the movable block can be compatible with workpiece surfaces of different shapes, fixation is formed through the convex edge and the arc-shaped edge, the movable block drives the concentric-square-shaped rod to horizontally move, the connecting rod mechanism drives the movable piece to be separated from the magnetic attraction positioning groove, the whole system reaches the dynamic balance state, and automatic centering and stable fixing of workpieces can be achieved without external power.

The application discloses a modified nickel powder and a preparation method thereof, a conductive silver-nickel paste, and a TOPCon solar cell. The preparation method of the modified nickel powder comprises the following steps: demagnetizing treatment on the nickel powder; and surface coating treatment on the demagnetized nickel powder to obtain the modified nickel powder. The raw material composition of the conductive silver-nickel paste comprises, in percentage by weight, 60-90 wt% of silver powder, 2-30 wt% of the modified nickel powder, 1.2-4.5 wt% of glass powder, 1-5 wt% of organic resin, 1-10 wt% of organic solvent, 0.1-0.5 wt% of silicone oil, and 0.1-1 wt% of an additive. The application solves the problems of oxidation and magnetic agglomeration of the traditional nickel powder, improves the dispersion stability of the paste, reduces the contact resistance and the paste cost, and guarantees the conductivity and the adhesion.

To provide odor-proof bags that offer excellent odor-blocking properties and can be manufactured inexpensively even in small batches. [Solution] The odor-proof bag 1 is formed such that the surface coat layer of the three-layer laminated sheet 10, which consists of an olefin resin sheet layer, an aluminum vapor-deposited layer, and a surface coat layer 16 laminated in this order, is the outer surface, and preferably the olefin resin sheet layer is made of polypropylene film. The odor-proof bag has an opening 11 and a closing means for keeping the opening closed after the contents are inserted.

The present application relates to optical fiber surface coating treatment device technical field, especially to a kind of optical fiber metal coating spraying device, including the spraying mechanism of lower shell, shunt chamber, combustion chamber and ring spray component composition, and for driving the linear drive mechanism and rotary drive mechanism of rotary movement of spraying mechanism.The present application is by being provided with independent oxygen passage, hydrogen passage and metal powder passage in shunt chamber, and by corresponding oxygen hole, hydrogen hole and metal powder hole spray into combustion chamber, it is realized in the state that oxygen content is higher, to metal powder realizes rapid melting, improves the purity of metal molten liquid;And by the ring array side nozzle on annular jet pipe, it is realized to the overall metal coating of optical fiber surface;While improving the controllability of optical fiber surface metal coating quality and coating thickness and uniformity.

The invention relates to the technical field of thermoelectric material surface treatment, and provides a bismuth telluride-based thermoelectric material wafer surface treatment method which comprises the following steps: acquiring multi-dimensional data such as current density distribution, temperature field distribution, solution concentration gradient and plating thickness increment in real time through a sensor array; performing iterative calculation on the data based on a thermoelectric performance parameter optimization model to generate an optimal parameter combination of chemical oil removal, activation, nickel plating and tin and bismuth plating processes; dynamically adjusting the anode plate area ratio, the current density threshold value and the solution temperature fluctuation range of the electroplating equipment; a self-adaptive feedback mechanism is used for correcting parameter deviation, so that a uniform thermoelectric function layer structure is formed on the surface of the wafer. According to the method, the uniformity and the thermoelectric performance stability of the surface coating of the bismuth telluride thermoelectric wafer can be improved, the defect rate is reduced, and the production efficiency and the product consistency are improved.

The invention relates to the technical field of circuit load state monitoring, and discloses a directional drilling pipeline surface coating damage characteristic analysis method based on data inversion, which comprises the following steps: injecting a dual-frequency composite excitation signal into a pipeline transmission loop; locking a current phase, collecting a magnetic flux gradient vector and performing orthogonal decomposition; according to the method, impedance distortion caused by medium heterogeneity is eliminated through the pilot frequency response difference, the problem of misjudgment caused by the fact that traditional detection depends on medium isomorphism hypothesis is solved, and the detection accuracy is improved. And accurate identification of transmission load leakage impedance abnormity is realized.

Valves with a coated surface are described. A surface of the valve can include a surface coating. For example, the surface coating can include many different materials and may include a metal or metal alloy such as, for example, a molybdenum alloy or a nickel alloy or a nickel molybdenum alloy. Systems and devices including the valves are also described.

The invention relates to the technical field of sodium ion battery positive electrode materials, in particular to a composite sodium ferric sulfate positive electrode material, a sodium ion battery and a preparation method. The preparation method comprises the following steps: preparing a group IIIA metal doped composite sodium ferric sulfate precursor; mixing with a solution containing a sodium source, an iron source and a phosphorus source; and performing staged heat treatment under a protective atmosphere to form a pyrophosphate ferric phosphate sodium coating layer. The particle size D50 of the composite sodium ferric sulfate positive electrode material is 3-5 [mu] m, and the composite sodium ferric sulfate positive electrode material can inhibit iron dissolution and enhance structural stability through bulk phase doping and surface coating cooperation, can prolong the cycle life of a battery and reduce gas production, and is suitable for a high-performance sodium ion battery.

The invention belongs to the technical field of medical osteogenesis materials, and particularly relates to a titanium-based material surface PDPASr (at) CO coating with osteogenesis promoting and antibacterial functions and a preparation method and application thereof.The preparation method comprises the steps that S1, a titanium-based material is soaked in an alkali solution and placed in a vacuum drying oven to be subjected to alkali heat treatment; s2, allowing the titanium-based material to stand under a dark condition, soaking the titanium-based material in a polydopamine solution for 20-28h, and then taking out the titanium-based material; s3, preparing a mixed solution system containing PAH, SrCl2 and NaOH, standing the titanium-based material under a dark condition, soaking the titanium-based material in the mixed solution system for 20-30 hours, and then taking out the titanium-based material; s4, the titanium-based material is soaked in a ferroferric dodecacarbonyl solution, the titanium-based material is taken out after being shaken and reacted for 20-30 h in a shaker under the dark condition, and the titanium-based material with the PDPASr (at) CO coating on the surface is obtained.The PDPASr (at) CO coating on the surface of the titanium-based material has the excellent osteogenesis performance, the spreading, early differentiation and late mineralization effects of osteoblasts can be obviously promoted, and the titanium-based material has the good application prospect. And under the condition of near-infrared light irradiation, the material shows excellent antibacterial performance.

The invention provides a bio-based low-temperature curing powder coating and a preparation method thereof, and belongs to the technical field of powder coatings, and the bio-based low-temperature curing powder coating specifically comprises the following components in parts by weight: 65-75 parts of bio-based resin, 5-6 parts of triglycidyl isocyanurate, 0.05-0.15 part of tetrabutylammonium bromide, 8-12 parts of air glass beads, 4-6 parts of mica and 0.4-0.6 part of ethylene bis stearamide. 0.7 to 1.3 parts of flatting agent, 0.2 to 0.5 part of benzoin, 0.3 to 0.7 part of amide wax and 6 to 8 parts of pigment. The curing temperature of the bio-based low-temperature curing powder coating is 100-120 DEG C, and the bio-based low-temperature curing powder coating has the advantage of low curing temperature, can be suitable for surface coating of plastic devices, has the advantages of salt mist resistance, impact resistance and the like, and can effectively solve the problems of existing powder coatings.

The invention relates to the technical field of batteries, in particular to a negative plate and a lithium ion secondary battery comprising the negative plate. The negative plate comprises a negative coating, and the negative coating comprises a negative active layer and a surface coating; the surface coating comprises lithium lanthanum titanium oxide; the negative electrode active layer comprises a silicon-carbon material, and the sphericity degree S of the silicon-carbon material is more than or equal to 0.3 and less than or equal to 0.8; the mass content C1 of the Si element in the negative electrode coating is 8-70%; the molar ratio of Ti to La in the negative electrode coating is 1.6-2; the surface coating is at least partially embedded into the negative electrode active layer, and Ti and / or La are at least partially located on the surface of the silicon carbon material; and the embedding depth d1 of the surface coating layer is 1-8 [mu] m. By improving the negative plate, the K value deterioration phenomenon can be remarkably improved, and meanwhile, the safety performance of the battery is improved; the battery provided by the invention has excellent fast charging performance and low-temperature performance.

The invention provides a coated microcrystal lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The positive electrode material is a lithium-rich manganese-based positive electrode material which is prepared from a lithium-rich manganese-based precursor and has primary particles formed in situ and secondary spheres with surface coatings. The positive electrode material has a unique core-shell structure, the core is a microcrystal lithium-rich material, the shell is a nanoscale solid electrolyte layer, and the shell layer coats primary particles and secondary spheres at the same time; the structure effectively inhibits the interface side reaction between the positive electrode material and the solid electrolyte, and stabilizes the interface structure; a continuous and short Li and charge transmission path is provided, the interface impedance in an all-solid-state battery is remarkably reduced, and the rate capability and the cycling stability of the material are improved.

The invention relates to a double-layer Si-Zr self-reaction coating and a preparation method thereof, and belongs to the technical field of carbon ceramic ablative materials. B4C powder is subjected to ball milling and crushed until the diameter is smaller than 100 nm, ZrSi2 alloy is added and evenly mixed with B4C subjected to ball milling, a polycarbosilane solution is added for ball milling, ZrSi2 slurry wrapped by B4C is obtained and dried, and ZrSi2 powder wrapped by B4C is obtained; adding the powder into a polysiloxane solution containing SiC powder, and mechanically and sufficiently mixing to obtain slurry; spraying the slurry on the surface of the C / C material through pressurization, and drying to obtain the coating material. The coating comprises the polysiloxane-containing SiC layer on the outer layer and the B4C-ZrSi2 layer on the inner layer, in the oxidation ablation process, the crack effect of the coating on the surface layer can be achieved within a certain time, and the oxidation rate of the material is greatly decreased.

The invention discloses a preparation process of an ultra-high hardness AlCrN / AlCrSiWN nano multilayer composite coating, and belongs to the technical field of material surface coatings. The process is carried out by adopting an arc ion plating technology and specifically comprises the following steps: (1) respectively placing an AlCrSiW target and an AlCr target on corresponding cathode target positions; vacuumizing until the vacuum degree is 3.0 * 10 <-3 > Pa or above; (2) bombardment etching is carried out on the substrate; (3) depositing an AlCrN transition layer; (4) depositing an AlCrN / AlCrSiWN nano multi-layer modulation coating layer; and (5) depositing an AlCrSiWN functional layer. According to the preparation method, the AlCrSiWN coating and the AlCrN coating are alternately deposited, so that the AlCrN / AlCrSiWN nano multilayer composite coating with ultrahigh hardness is prepared, and the hardness and the toughness of the coating are synchronously improved. And a breakthrough solution is provided for meeting high-end requirements in the field of surface strengthening of precision cutters and molds.

The invention relates to the technical field of graphite negative electrode materials for lithium ion batteries, a surface coating layer structure of the graphite negative electrode material is finely designed to obtain a fast-charging graphite negative electrode material, the fast-charging graphite negative electrode material is provided with a core-shell structure, the core-shell structure takes graphite particles as an inner core, and the surface of the inner core is provided with a carbon coating layer with an ultra-micro pore structure; the pore opening diameter of the ultra-micro pore structure is 0.3-2.0 nm, the pore cavity diameter of the ultra-micro pore structure is 0.5-3.0 nm, and the pore opening diameter of the pore opening is smaller than the pore cavity diameter. A coating layer with an ultra-micro pore structure is introduced to the surface of the graphite negative electrode material, and the structural characteristics of pore cavities and pore openings in the ultra-micro pore structure are finely designed, so that the desolvation speed of lithium ions in an electrolyte on the surface of the material is increased, and the interface structure stability of the graphite negative electrode material can be effectively improved in the process; therefore, the fast charging performance and the cycle performance of the graphite negative electrode material can be effectively improved.

The utility model discloses a supporting tool convenient for preparing a surface coating of a ball core piece, which belongs to the field of alloy coating preparation and is characterized in that a supporting sleeve is sleeved on a working connecting rod, an adjusting screw hole and a positioning screw hole are arranged on the supporting sleeve, and a positioning screw is used for connecting the supporting sleeve with the working connecting rod through the positioning screw hole; the adjusting screw is detachably connected into the adjusting screw hole through a thread; the operation ball core piece is arranged on the supporting sleeve in a sleeving mode, and the inner surface of the operation ball core piece abuts against the top end of the adjusting screw. According to the utility model, two line supports are matched with one central point support and conform to the equilateral triangle design principle, so that the gravity center of the tool and the gravity center of a working piece are ingeniously overlapped together, and the eccentricity ratio is reduced, thereby reducing the coating defects caused by eccentricity and jumping in the coating preparation process and improving the coating quality of products.

A method for manufacturing a patterned surface coating of an automobile heat dissipation device and an automobile heat dissipation device having a patterned surface coating. The method for manufacturing the patterned surface coating of the automobile heat dissipation device includes providing a metal heat dissipation device, and forming a sputtered metal layer that is patterned on an upper surface of the metal heat dissipation device by sputtering, allowing a thickness of the sputtered metal layer to be between 1 μm and 3 μm, and allowing the sputtered metal layer to cover an area less than 90% of an area of the upper surface of the metal heat dissipation device.

The invention provides base metal main grid slurry, a preparation method thereof and a photovoltaic cell. The base metal main grid slurry comprises 3-8 parts by mass of nickel powder, and the surface of the nickel powder is coated with a modified component; 0.5-1 part by mass of first glass powder; 0.5 to 1.5 parts by mass of second glass powder; 13-16 parts by mass of an organic phase; 0.2 to 0.5 part by mass of an organic auxiliary agent; 15-25 parts by mass of a first silver powder; and 45-60 parts by mass of a second silver powder. The base metal nickel is used for replacing part of silver powder, the wettability is improved through surface coating, meanwhile, glass elements are optimized, the glass softening point is reduced, the paste can be sintered at the low temperature, close combination of silver particles is facilitated, and the density and conductivity of a conducting layer are improved. According to the technical scheme, the sintering is compact, the conductivity is slightly higher than that of pure silver paste, and the effects that the efficiency is equal to that of the silver paste and the tension is slightly lower than that of the pure silver paste are achieved.