2558 results about "Compression molding" patented technology

The invention relates to the technical field of compression molding of carbon fiber prepregs, in particular to a partitioned pressurization control method and system for compression molding of the carbon fiber prepregs and a molding process. S2, initial pressure calculation; s3, gradient pressurization control; s4, dynamic pressure adjustment; and S5, a global pressure maintaining stage: when the resin curing degree alpha reaches 0.6-0.8, switching to a full-screen pressure maintaining mode, and maintaining the pressure of each region to be 90%-95% of the current maximum pressure value until curing is completed. The invention provides a zoning pressurization control method and system for compression molding of carbon fiber prepreg and a molding process, and realizes the compression molding method and system with accurate zoning pressure regulation and control and directional discharge of volatile components. And by integrating intelligent sensing, multi-channel hydraulic control and a data driving optimization algorithm, the limitation of a traditional process is broken through, and a technical support is provided for efficient forming of the high-performance carbon fiber composite material.

The invention relates to the technical field of process optimization, and discloses an optimization method and system for a graphite sagger compression molding process. The method comprises the following steps: determining and analyzing particle size distribution, specific surface area, porosity and viscosity-temperature characteristics of graphite powder and a binder to obtain raw material characteristic parameter data; modeling is conducted on the migration behavior of the binder and the deformation characteristic of the graphite powder in the pressing process, a material rheological model is obtained, meanwhile, a multi-point pressure sensor system is arranged on the surface of a pressing mold, and target pressure data are collected; constructing a pressure distribution feature vector and a material flow state prediction result; performing adaptive adjustment on the initial pressing parameters to obtain a segmented pressure curve and a local pressure compensation strategy; and performing multi-objective optimization on the graphite sagger pressing path to obtain an optimal pressing process parameter combination. The method is combined with material flow state prediction, accurate control over the pressing process is achieved, and the intelligent level of the graphite sagger pressing forming technology is improved.

The present invention relates to the technical field of compression molding production lines, and in particular relates to an automatic SMC-sheet compression molding production line, and an automatic material conveying method therefor. The automatic SMC-sheet compression molding production line sequentially comprises an infeed conveyor system, a molding machine and an outfeed conveyor system, wherein the infeed conveyor system comprises a peeling and clamping mechanism, a feeding and cutting mechanism, a first lifting platform, a rotary transfer table, a second lifting platform and a mobile feeding trolley, which are sequentially arranged, and the outfeed conveyor system comprises a gripping mechanism, a conveying platform and a transition platform, which unload and output compression-molded products. By means of the automatic SMC-sheet compression molding production line and the automatic material conveying method therefor in the present invention, an automatic production process for SMC sheets, which involves unfolding, peeling, flattening, cutting, quantitative weighing, feeding and outputting, can be realized, thereby improving the production efficiency, and reducing the labor intensity.

The invention belongs to the technical field of ceramics, and discloses a preparation method of fracture-resistant and wear-resistant ceramics. The preparation method comprises the following steps: weighing the raw materials in parts by weight; the preparation method comprises the following steps: mixing 40 parts of potassium feldspar, 10 to 25 parts of albite, 1 to 10 parts of kaolin, 1 to 10 parts of serpentine, 5 to 25 parts of dolomite, 2 to 9 parts of nano zirconium oxide, 0.1 to 1 part of nano cerium oxide, 0.1 to 1 part of nano molybdenum disulfide, 0.1 to 0.8 part of silicon carbide fiber, 0.5 to 2.5 parts of polyethylene glycol, 0.1 to 0.6 part of fullerene trifluoromethyl derivative, 0.1 to 3 parts of sodium dodecyl sulfate, 0.1 to 2 parts of sodium tripolyphosphate and 10 to 60 parts of solvent to obtain slurry; and carrying out spray granulation to obtain a blank, carrying out compression molding to obtain a green body, and sintering to obtain the fracture-resistant and wear-resistant ceramic. The breaking strength of the breaking-resistant and wear-resistant ceramic can exceed 70 MPa, and the length of a grinding pit does not exceed 8.5 mm.

The invention relates to the technical field of composite material forming, and discloses a compression molding process optimization method of a carbon fiber reinforced composite material thin material. According to the method, multi-dimensional process parameters such as temperature gradient distribution data, pressure load change data and resin flow rate data in the compression molding process are collected in real time through a distributed sensing network; establishing a process state evaluation model to carry out initial defect feature recognition on the parameters, and generating an initial defect feature spectrum; performing defect mode matching on the initial defect characteristic spectrum based on the material characteristic database, and separating a main defect data stream from a secondary defect data stream; constructing a real-time compensation instruction set according to the main defect data flow, and synchronously driving a mold pressing equipment executing mechanism to carry out dynamic process parameter correction; the corrected secondary defect data flow is fed back to the material characteristic database to update the defect mode matching rule; and iteratively executing dynamic process parameter correction until a process convergence condition is met, and outputting a quality control report of the finally formed thin material.

The invention relates to a method for preparing a high-performance plate by using an ex-service wind power blade, the high-performance plate and application of the high-performance plate, and the method comprises the following steps: separating the ex-service wind power blade into fiber strips, reinforcing ribs, glass fiber reinforced plastic crushed materials, blade powder and balsa wood-PVC powder, and respectively treating the materials to prepare each component of the multi-effect high-performance plate; and finally, all the components are subjected to compression molding treatment to be manufactured into the multifunctional high-performance plate, all the components of the retired wind power blade can be recycled, and then the disposal problem of the retired wind power blade can be solved. And moreover, the glass fiber filaments obtained by degrading the retired wind turbine blade and the thermosetting resin form the reinforced panel, so that the strength of the multifunctional high-performance plate can be improved while the stability of the overall structure of the reinforced panel is ensured. In addition, compression molding treatment is performed by fully utilizing the characteristics of different parts, so that the illumination resistance of the board can be improved, the board is not easy to deform due to water absorption, and the applicability of the board can be further improved.

The invention provides a NiTiNb shape memory alloy and a preparation method thereof, and the preparation method specifically comprises the following steps: (1) uniformly mixing a Ni source, a Ti source and a Nb source to obtain mixed powder; (2) carrying out cold mold compression molding on the mixed powder to obtain an alloy green body; and (3) the green body is sintered, and the NiTiNb shape memory alloy is obtained. According to the preparation method disclosed by the invention, the NiTiNb alloy with uniform components and high density can be prepared by introducing Nb source powder for sintering and regulating and controlling sintering temperature parameters, so that the strength of the NiTiNb alloy is improved to 1600 MPa or above, the density of the alloy is improved to 92%, the compression strength is higher than 2000 MPa, the fracture strain is higher than 30%, the 8% tensile recovery rate is higher than 50%, and the mechanical property of the alloy is greatly improved.

The invention relates to a high-frequency and high-performance iron-nickel alloy magnetic powder core and a preparation method and application thereof, belongs to the field of metal magnetic powder cores, and solves the problems that in the prior art, when a metal magnetic powder core is applied at high frequency, high magnetic conductivity, high magnetic conductivity stability and high quality factor are difficult to consider, and the saturation flux density is low. And the preparation process is tedious. The invention discloses a preparation method of a high-frequency high-performance iron-nickel alloy magnetic powder core. The preparation method comprises the following steps: S1, preparing raw materials; s2, performing pretreatment; s3, the pretreated iron-nickel alloy powder and nano SiO2 powder are blended, and inorganic insulation coating powder is obtained; s4, adding the inorganic insulating coating powder into a first coating agent to obtain inorganic and first organic insulating coating powder; s5, adding the inorganic and first organic insulation coating powder into a second coating agent to obtain inorganic and double-layer organic insulation coating powder; and S6, compression molding. The comprehensive magnetic performance of the iron-nickel magnetic powder core is improved, and the preparation process is simplified.

The invention provides a preparation method for improving the performance and carbon sequestration rate of a steel slag carbonized product, and the preparation method specifically comprises the following steps: (1) weighing the following raw materials in percentage by mass: 50-100 parts of steel slag powder, 13-17 parts of deionized water and 1 part of alcohol amine; (2) mixing the weighed deionized water with alcohol amine to obtain an alcohol amine solution, stirring the alcohol amine solution in a magnetic stirrer, continuously introducing CO2 gas with the concentration of 99.9% to carbonate the alcohol amine solution, and controlling the gas introduction time to be 2 hours; (3) doping an alkylol amine solution subjected to carbonation treatment into the weighed steel slag powder, and uniformly stirring by using a neat paste stirrer; (4) pressing the steel slag mixture into steel slag product briquettes in a compression molding manner; and (5) putting the briquette into a carbonization kettle, and introducing CO2 gas with the purity of 99.9% to prepare a steel slag carbonized product. The problem that the interior of the steel slag carbonized product cannot be fully carbonated and maintained is solved, so that the comprehensive performance and the carbon sequestration rate of the steel slag carbonized product are remarkably improved.

The invention discloses an yttrium-rich neodymium-iron-boron magnet and a preparation method thereof, and belongs to the technical field of rare earth permanent magnet material preparation. The preparation method comprises the following steps: mixing yttrium-rich neodymium-iron-boron matrix alloy powder with grain boundary doped alloy powder containing Gd and / or Ho, and carrying out compression molding and sintering tempering treatment to obtain a first yttrium-rich neodymium-iron-boron magnet. According to the invention, the grain boundary doped alloy powder containing Gd and / or Ho is added into the yttrium-rich neodymium iron boron matrix alloy powder and then is sintered, so that a continuous and uniform non-magnetic thin-wall grain boundary phase structure is formed in the grain boundary, and the coercive force of the magnet is enhanced. Dy and / or Tb heavy rare earth element grain boundary diffusion is carried out based on the first yttrium-rich neodymium-iron-boron magnet after grain boundary modification, a second yttrium-rich neodymium-iron-boron magnet is obtained, the diffusion depth of Dy and / or Tb in the magnet can be increased, the utilization rate can be increased, the cost can be reduced, the coercivity of the magnet can be improved, and the adverse effect of Dy and / or Tb on residual magnetism can be reduced.

The invention provides a cement stabilized macadam mixture based on large-dosage lithium slag and a preparation method of the cement stabilized macadam mixture, and relates to the technical field of preparation of cement stabilized macadam layers.The preparation method comprises the steps that aggregate, cement, fly ash, lithium slag powder and a second exciting agent are mixed and stirred to be uniform, and the cement stabilized macadam mixture is obtained; and uniformly stirring the cement stabilized macadam mixture and water, and carrying out compression molding to obtain the cement stabilized macadam mixture based on the high-doping-amount lithium slag. According to the application, the lithium slag is subjected to activation, curing granulation and other processes to replace a part of cementing materials and graded broken stones in a cement stabilized broken stone layer, so that recycling, large-scale energy utilization and high-performance utilization of the lithium slag are realized; the lithium slag, the lithium slag powder and the active and non-active tailing smelting slag are prepared into the autoclaved artificial aggregate, and the autoclaved artificial aggregate is prepared into the cement stabilized macadam mixture, so that large-scale utilization of the lithium slag is realized, and the cost is reduced; the industrial waste and the lepidolite lithium slag are utilized, so that the environmental pollution is reduced, and the resource utilization of the waste is realized.

The invention discloses a method for converting niobium minerals in niobium rough concentrate into pyrochlore. The method comprises the following steps: (1) mixing the niobium rough concentrate with a modifier, a fluorine-containing reagent, a reducing agent and a binder, and carrying out compression molding; and (2) roasting the mixed blank for a set time, preserving heat, and quenching to obtain pyrochlore type rough concentrate. The method comprises the following steps: (1) carrying out magnetic separation on pyrochlore type rough concentrate; (2) performing heating and acid leaching on the magnetic separation tailings; and (3) carrying out flotation to obtain niobium concentrate. According to the method, iron components in the rough concentrate are reduced into magnetic iron minerals, niobium minerals are converted into non-magnetic pyrochlore, follow-up niobium-iron separation is facilitated, and the grade of niobium in the niobium concentrate obtained through production can be effectively improved; and the method is high in adaptability to niobium rough concentrate, is also applicable to alkaline or acidic niobium rough concentrate, is relatively small in gangue mineral change and low in conversion reaction temperature, and has the advantages of energy conservation and emission reduction compared with other regulation and control processes.

The invention relates to the technical field of compression molding, and particularly discloses a polytetrafluoroethylene powder molding device which comprises a molding press body and further comprises a regulation and control assembly, the regulation and control assembly is arranged on the lower side of a pressing table, and the regulation and control assembly automatically regulates the size of a lower mold exhaust hole according to the powder weight weighed by a feeding assembly and the mold pressure during pressurization. The size of the exhaust hole in the side edge of the lower die can be automatically adjusted through the adjusting and controlling assembly according to the powder weight weighed by the feeding assembly so as to be matched with the pressurized powder amount, the situation that exhaust is excessive or insufficient during powder raw material pressing is prevented, and in the pressurizing process, the pressure of the die is gradually increased, so that the pressure of the die is gradually increased. The opening degree of the exhaust hole is automatically and gradually reduced, transverse cracks are prevented from being caused, and if residual gas in the powder is not fully exhausted in the pressurizing process, the adjusting and controlling assembly can be controlled again through the auxiliary assembly to adjust the exhaust hole of the lower mold, so that the residual gas is exhausted, and the powder compression molding quality is improved.

The invention discloses an impact-resistant packaging material and a preparation method thereof, and relates to the technical field of packaging materials. When the impact-resistant packaging material is prepared, the zinc oxide-loaded porous silicon dioxide microspheres and the phosphorus-silicon synergistic flame retardant react to prepare functionalized porous silicon dioxide microspheres; the preparation method comprises the following steps: reacting 4-[2, 2 ': 6', 2 ''-terpyridyl]-4 '-yl-benzylamine with ethyl acrylate to prepare a terpyridyl diester monomer; the preparation method comprises the following steps: carrying out condensation polymerization on ethylene glycol, a terpyridyl diester monomer and benzophenone-4, 4 '-diethyl diformate to prepare functional polyester; the functionalized polyester and 2-aminoethyl-2-cyanoacetate are subjected to a reaction, and modified polyester is prepared; and carrying out melt blending on the modified polyester, the functionalized porous silicon dioxide microspheres, zinc chloride and 1, 6-dichlorohexane, and carrying out compression molding to obtain the impact-resistant packaging material. The impact-resistant packaging material prepared by the invention has excellent anti-aging, impact-resistant, flame-retardant and antibacterial properties.

Method and system for optically checking molded parts (10) in a transmitted light method, more particularly closures or the like produced by thermoforming or compression molding methods, comprising transporting the molded parts (10) from a transport device (50) through an optical checking area, and recording at least one image of the molded part (10) using a recording device (20), whereby the molded part (10) is located between the recording device (20) and an illumination device (30) and is illuminated by same, whereby the image is evaluated using processing means (40) in such a way that defects of the molded part (10) and / or statistical deviations from a normal distribution are able to be determined, from which conclusions are able to be drawn about a manufacturing process of the molded parts (10) in a molding tool having a cavity, whereby the conclusions are able to be used to control the manufacturing process.

The invention provides a biochar composite porous material for heavy metal contaminated soil remediation and a preparation method and application of the biochar composite porous material. The preparation method comprises the steps that biomass raw materials are subjected to high-temperature pyrolysis carbonization and then smashed, ground and sieved, and biochar powder is obtained; dispersing in a phosphoric acid solution to obtain a biochar solution, and filtering, washing and drying after a hydrothermal activation reaction to obtain activated biochar; dispersing in a chitosan solution, carrying out ultrasonic oscillation, filtering, washing and drying to obtain modified charcoal; mixing sodium bentonite, attapulgite and deionized water, uniformly mixing the modified charcoal, the functional slurry and a sodium carboxymethyl cellulose solution to obtain composite slurry, performing compression molding to obtain a green body, and then drying and calcining the green body. The biochar composite porous material prepared by the invention can simultaneously play multiple roles of physical adsorption, chemical chelation, ion exchange and the like in a heavy metal contaminated soil treatment process, so that efficient fixation of various heavy metal ions is realized.

The invention discloses a polyurethane protective adhesive tape for aviation and a preparation method thereof, and relates to the technical field of adhesives. When the polyurethane protective adhesive tape for aviation is prepared, polyester glycol, an ultraviolet absorption monomer, 3-(4-pyridyl) pentane-1, 5-diol, 1, 4-butanediol and isophorone diisocyanate are polymerized to prepare polyurethane; the preparation method comprises the following steps: carrying out a reaction on polyurethane and 2-bromoethyl acrylate to prepare modified polyurethane; enabling the pretreated magnesium hydroxide to react with 3-epoxypropoxy-1, 1, 3, 3-tetramethyldisiloxane and ammonia water in sequence, so as to obtain modified magnesium hydroxide; the modified polyurethane and the modified magnesium hydroxide are mixed and then subjected to compression molding to prepare a polyurethane film; and coating a polyurethane film with the polyacrylate glue solution, and drying to obtain the polyurethane protective adhesive tape for aviation. The polyurethane protective adhesive tape for aviation prepared by the invention has excellent flame-retardant, anti-aging, antibacterial and self-repairing properties.

The invention provides a polyimide-based dielectric heat-conducting composite material and a preparation method thereof.The preparation method comprises the steps that a hexagonal boron nitride nanosheet is modified through polydopamine to obtain a modified boron nitride nanosheet (MBN), and the modified boron nitride nanosheet (MBN) is mixed with a polyamide acid (PAA) solution to obtain an MBN / PAA solution; mBN is directionally distributed in PAA nanofibers through an electrostatic spinning technology, meanwhile, dispersion liquid of silver wires is electrostatically sprayed, and the silver wires serve as a bridge, so that a heat conduction path is constructed under the condition that less filler is doped; finally, the MBN-AgNW / PI dielectric heat-conducting composite material is prepared through a staggered stacking-compression molding-thermal imidization technology, and the prepared composite material is good in heat conductivity, low in dielectricity and high in insulativity and has huge application potential in electronic packaging equipment.

The invention relates to the technical field of silicon mullite bricks, in particular to a method for preparing a low-thermal-conductivity silicon mullite brick by utilizing basalt fibers and ceramic powder. Comprising the following steps of S1, raw material preparation, S2, functional layer preparation, S3, thermal insulation layer preparation and S4, compression molding. The corrosion resistance and the thermal insulation performance of the low-thermal-conductivity silicon mullite brick are further optimized and improved through the synergistic effect of the basalt fibers and the ceramic powder, and the problem that the performance of a composite material is affected due to the fact that the basalt fibers are prone to being pulled out when stressed is solved. By adopting the ceramic powder with the core-shell structure, the mechanical property of the basalt fiber composite material can be remarkably improved, and the salt and alkali resistance and the heat preservation effect of the brick are optimized while the mechanical property of the low-heat-conductivity silicon mullite brick is further improved.

The invention relates to the field of cellular board pressing machines, in particular to a pressing device for a non-adhesive cellular board. The conveying rollers are symmetrically arranged on the inner side of the mounting frame, and the outer sides of the conveying rollers on the two sides are sleeved with a conveying belt; a limiting pressing unit; an auxiliary maintenance unit; wherein the limiting press-fit unit comprises a supporting assembly, a pressing assembly, a knocking assembly and an automatic limiting assembly, the supporting assembly is arranged on the outer side of the conveying belt, connected with the mounting frame and connected with the auxiliary maintaining unit, and the pressing assembly is arranged between the supporting assembly and the conveying belt; an automatic limiting assembly connected with the supporting assembly is further arranged on the outer side of the pressing assembly, a knocking assembly is further arranged on the pressing assembly, the limiting press-fit unit is arranged and matched with the auxiliary maintaining unit, the stability of the non-adhesive cellular board in the pressing process can be guaranteed, bubbles at the connecting position can be discharged in the pressing process, and the pressing efficiency is improved. And therefore, the stress of the non-adhesive cellular board is more uniform, and the strength of the non-adhesive cellular board after compression molding is ensured.

The utility model discloses a side edge cutting device for a multi-layer composite sheet material. The side edge cutting device is arranged at the output end of compression molding equipment for the multi-layer composite sheet material. The side edge cutting device comprises a support, a conveying roller set, a side edge rotating cutter assembly and a waste collecting part. The conveying roller set comprises a driving conveying roller and a driven conveying roller, and a conveying channel for multiple layers of composite sheet materials to pass through is arranged between the driving conveying roller and the driven conveying roller. The side edge rotating cutter assembly comprises two side edge rotating cutters which are arranged in the width direction of the conveying channel in a spaced mode, and the two side edge rotating cutters synchronously rotate along with the driving conveying roller or the driven conveying roller. The waste collecting part is located below the side edge rotating cutters, and when viewed in the width direction of the conveying channel, the edge of the end of the side, close to the waste collecting part, of the cutting edge of each side edge rotating cutter is closer to the waste collecting part than the conveying channel. According to the device, flexible rotating cutting can be achieved, and burrs and flashes are reduced.

The invention discloses a corrosion-resistant neodymium-iron-boron magnet and a preparation method, and belongs to the technical field of neodymium-iron-boron magnets, and the preparation method of the corrosion-resistant neodymium-iron-boron magnet is characterized by comprising the following steps: S1, uniformly mixing neodymium-iron-boron powder obtained by jet milling with alloy nano-powder, and sieving to obtain a mixed material, wherein the adding amount of the alloy nanometer powder is 0.2-0.8% of the weight of the neodymium iron boron powder; s2, compression molding: carrying out compression molding and oil isostatic pressing on the mixed material to obtain a pressed blank; s3, sintering molding: sintering the pressed blank to obtain a neodymium-iron-boron magnet; s4, carrying out pretreatment on the neodymium-iron-boron magnet; and S5, preparing a coating solution, stirring and mixing silane, a solvent and water according to the weight ratio of 1: (0.8-1.2): (2.2-2.8) to prepare a silane hydrolysate, then adding zinc and aluminum sheet-shaped powder, uniformly stirring and mixing, spraying, and drying to obtain the corrosion-resistant neodymium-iron-boron magnet, thereby achieving the effect of improving the corrosion resistance of the neodymium-iron-boron magnet.

The invention discloses a preparation method of an iron-silicon-based composite soft magnetic powder core, which comprises the following steps: compounding and uniformly mixing iron-silicon-titanium powder and iron-silicon powder, and carrying out heat treatment in an air atmosphere; and then performing insulation coating on the surface of the magnetic powder by using a polyvinyl alcohol aqueous solution and a nano oxide, and performing compression molding and heat treatment to prepare the iron-silicon-based composite soft magnetic powder core. Compared with a conventional iron-silicon powder core, the iron-silicon-based composite soft magnetic powder core prepared through the method has the advantages that the direct-current bias performance under the condition of 100 Oe is higher than 76%, the volume loss Pcv under the conditions of 50 kHz and 100 mT is lower than 500 mW / cm < 3 >, and the loss performance is obviously improved.

The invention discloses a preparation method of an iron-containing furnace charge for a blast furnace. The method comprises the following steps: uniformly mixing an iron-containing raw material with a bonde-1 (containing an organic polymer binder, an active calcium-based substance and an active iron-based substance), then adding a bonde-2 (containing silica sol and water glass) and water, and further uniformly mixing to obtain a mixture; carrying out compression molding on the mixture to obtain a wet block mass; and drying and solidifying the wet block mass to obtain the iron-containing furnace charge. According to the method, by using the special multifunctional binder, efficient forming, rapid consolidation and clean low-carbon preparation of the blast furnace burden from the iron-containing burden can be achieved, the obtained blast furnace burden meets the performance requirements of the blast furnace burden, and the method has important practical significance for achieving the double-carbon strategy in the iron and steel industry.

The invention belongs to the technical field of ceramic materials, and relates to high-thermal-conductivity silicon nitride ceramic and a preparation method thereof. The invention discloses a preparation method of high-thermal-conductivity silicon nitride ceramic, which comprises the following steps: (1) uniformly mixing silicon powder and a sintering aid to obtain mixed powder, and carrying out compression molding on the mixed powder to obtain a silicon blank; the sintering aid is a rare earth metal oxide; (2) placing the silicon blank in a nitrogen-containing reducing atmosphere environment, pre-treating at 600-1180 DEG C, heating to 1350-1700 DEG C, and carrying out nitriding treatment to obtain a silicon nitride blank; and (3) placing the silicon nitride green body in an inert atmosphere, and sintering at 1800-2200 DEG C to obtain the silicon nitride ceramic. The pretreatment step is added before the nitridation reaction, so that silicon dioxide impurities wrapped on the surface of the silicon powder are effectively eliminated, and the oxygen content in a liquid phase is reduced on the basis of not reducing the total content of a sintering aid, so that a silicon nitride blank with low lattice oxygen content is more easily prepared, and the heat conductivity of the silicon nitride ceramic is improved.

The invention relates to the technical field of ceramic materials, in particular to high-purity aluminum nitride ceramic and a preparation method thereof.The preparation method of the high-purity aluminum nitride ceramic comprises the following steps that S1, granulation is conducted, specifically, aluminum nitride, a dispersing agent and modified polyvinyl butyral are mixed and granulated; s2, dumping and sintering: performing thermal degreasing in a dumping furnace, setting the heating rate to be 0.5-1.5 DEG C / min, setting the degreasing temperature to be 500-600 DEG C, and keeping the temperature for 2-4 hours; s3, compression molding: pressing into a green body by using an isostatic press, and controlling the molding pressure to be 80-100Mpa; s4, hot pressed sintering: smearing the protective liquid on the surface of the green body, and sintering in a heating and pressurizing manner; and S5, cooling and grinding are conducted, specifically, the sintered body is cooled to the normal temperature and ground to be flat. According to the preparation method of the high-purity aluminum nitride ceramic, the obtained ceramic chip has good mechanical strength and compactness.

The invention provides an aluminum-based composite material reinforced by nickel-coated silicon carbide through a magnetron sputtering dry method and a preparation process of the aluminum-based composite material, and relates to the technical field of metal-based composite materials and advanced electronic packaging thermal management materials. Comprising the following steps that S1, silicon carbide particles coated with nickel through a magnetron sputtering dry method and aluminum powder are put into a mold to be subjected to compression molding, and an initial blank is obtained; and S2, the initial blank prepared in the step S1 is placed in a re-pressing sintering furnace under the inert gas protection condition, continuous re-pressing is conducted under the temperature condition ranging from the temperature lower than the aluminum melting point by 50 DEG C to the temperature higher than the aluminum melting point by 200 DEG C, and the nickel-coated silicon carbide reinforced aluminum-based composite material obtained through the magnetron sputtering dry method is obtained. The aluminum-based composite material reinforced by magnetron sputtering dry nickel-coated silicon carbide disclosed by the invention is excellent in heat-conducting property and mechanical property and long in service life.

The utility model relates to the technical field of fiberboard processing, and discloses a compression molding device for fiberboard production, which comprises a base, a bottom die is fixedly mounted on the upper surface of the base, an ejector plate is slidably connected in a die cavity of the bottom die, the outer surface of the ejector plate is attached to the inner wall of the die cavity of the bottom die, and a heating plate is embedded in the bottom wall of the die cavity of the bottom die. A pushing rod is fixedly installed on the lower surface of the ejector plate, the lower end of the pushing rod penetrates into the base in a sliding mode, a U-shaped seat is fixedly connected to the bottom wall of the base, a rotating plate is rotationally connected between two vertical plates of the U-shaped seat, the lower end of the pushing rod is hemispherical, and the lower end of the pushing rod makes contact with the upper surface of the rotating plate and slides. And a control mechanism is arranged on the base. According to the utility model, in the upward displacement process of the top die, the compression molded fiberboard in the bottom die can be automatically ejected out, so that the difficulty of taking out the fiberboard from the bottom die by a worker is reduced, and the processing efficiency of the fiberboard is improved.

The invention relates to the technical field of ceramic materials, in particular to vanadium-based zircon microwave dielectric ceramic and a preparation method thereof.The vanadium-based zircon microwave dielectric ceramic is prepared from, by weight, Bi2O3, La2O3, CeO2, Nd2O3, Sm2O3 and NH4VO3, the chemical formula of the vanadium-based zircon microwave dielectric ceramic is (Bi < 0.2 > La < 0.2 > Ce < 0.2 > Nd0. 2Sm < 0.2 >) VO4, powder of Bi2O3, La2O3, CeO2, Nd2O3, Sm2O3 and NH4VO3 is obtained based on the components of the vanadium-based zircon microwave dielectric ceramic by weight, and original powder is obtained; stirring and mixing the original powder, performing wet grinding treatment and drying treatment to obtain dried powder, and pre-sintering the dried powder in the air atmosphere to obtain pre-sintered powder; a binder is added into the pre-sintered powder for granulation, compression molding is carried out, sintering is carried out in the air atmosphere, the vanadium-based zircon microwave dielectric ceramic is obtained, the vanadium-based zircon microwave dielectric ceramic has the near-zero resonant frequency temperature coefficient, the thermal stability of a device can be guaranteed, and the service life of the device is prolonged. The method is widely used for manufacturing microwave devices such as various dielectric antenna substrates, resonators and filters.

The invention provides a composite material compression molding device and a molding method, and relates to the technical field of hot press molding. The composite material compression molding device comprises a pre-pressing mold, an upper mold, a lower mold and an air supply device. According to the mold, the fixed insert, the movable insert and the upper wall of the lower mold plate jointly form a lower molding surface, a composite material product is separated from the lower molding surface through air pressure during stripping, surface defects of the product cannot be caused, and the product quality is effectively improved; meanwhile, the axial position is locked through the locking structure, the problem that the product locally protrudes due to the fact that the movable insert retreats when pressed is effectively solved, compressed air meeting the stripping pressure is filled into the air storage cavity in advance, the air supply device does not supply air any more during air blowing and stripping, and the production efficiency is improved. And the problem of energy waste caused by blowing of the air supply device after stripping of the product is completed can be avoided, and energy is saved.