516results about How to "Short preparation cycle" patented technology

The invention provides a recombinant collagen ionic liquid composition as well as a preparation method and application thereof, and relates to the technical field of cosmetics. The recombinant collagen ionic liquid composition provided by the invention is prepared from the following components in parts by mass: 19.8 to 79.99 parts of lysine citric acid ionic liquid, 20 to 80 parts of glycerol and 0.01 to 0.2 part of recombinant collagen, the lysine citric acid ionic liquid is mainly composed of lysine and citric acid, and the molar ratio of the lysine to the citric acid is (4-1): (2-1). The recombinant collagen ionic liquid composition is good in solubility, high in transdermal efficiency, small in irritation, short in preparation period, simple in process and capable of being continuously produced.

The invention belongs to the technical field of additive manufacturing, and relates to a low-density high-entropy alloy high-energy beam additive forming method. The method comprises the following steps: smelting an alloy; alloy crushing; ball-milling the powder; spheroidizing the powder; preparing a sample; heat treatment; and sample structure performance detection. The low-density high-entropy alloy sample prepared through high-temperature vacuum suspension smelting and plasma spheroidizing is high in room-temperature compression strength which exceeds 2300 MPa, the ductility exceeds 20%, the compression strength at the temperature of 1000 DEG C exceeds 780 MPa, meanwhile, the low-density high-entropy alloy powder manufacturing problem is solved, and the low-density high-entropy alloy powder manufacturing method is suitable for industrial production. The method has the advantages of good sphericity, good fluidity, uniform components, no hollow powder or satellite powder, low oxygen content and the like, and provides a powerful basis for promoting the application of high-temperature alloy structure new materials in the aerospace field.

The invention relates to multi-element rare earth silicate / silica carbon nano composite ceramic and a preparation method thereof. The composition general formula of the nano composite ceramic is (YbaHobErcLudTmeGdfTbgYhLaiScj) 2SixO2x + 3 / SiOC, a + b + c + d + e + f + g + h + i + j = 1, at least two of a, b, c, d, e, f, g, h, i and j are not 0 at the same time, and x = 1 or 2. The preparation method comprises the following steps: reacting a rare earth metal element complex with a silicon-based polymer to obtain a single-source precursor; the single-source precursor is obtained through cross-linking and high-temperature heat treatment, or the single-source precursor is subjected to cross-linking and pyrolysis to obtain ceramic powder, and the ceramic powder is further sintered at high temperature to obtain a ceramic block. The preparation method is simple, reliable, short in period and low in cost, and the water and oxygen corrosion resistance of the material can be effectively improved.

The invention discloses a carbon fiber hard felt surface anti-oxidation coating and a preparation method thereof, and the carbon fiber hard felt with an excellent anti-oxidation coating on the surface is prepared by performing three times of coating curing and one time of high-temperature graphitization on a carbon fiber hard felt matrix. Compared with the prior art, the high thermal insulation performance and the excellent surface coating performance of the hard carbon fiber thermal insulation felt are guaranteed, meanwhile, the use frequency of a high-energy-consumption equipment graphitization furnace is reduced, the coating efficiency and the surface coating performance are improved, the whole product period is shortened, and the production cost is reduced.

The utility model discloses a forming tool for a variable cross-section composite material barrel. The forming tool comprises a first end cover, a second end cover, an upper die and a lower die, wherein the upper die and the lower die are provided with molded surfaces matched with the outer surface of the variable cross-section composite material barrel; and the composite core mold is provided with a molded surface matched with the inner surface of the variable cross-section composite material barrel, the composite core mold is located in a cavity defined by the upper mold, the lower mold, the first end cover and the second end cover, and a cavity used for forming the variable cross-section composite material barrel is defined by the upper mold, the lower mold and the composite core mold. The integral male die is made of low-melting-point alloy, thermal damage of high temperature to the composite barrel is avoided, secondary machining of the molded surface of the male die is not needed, the molded surface is smooth, the manufacturing period is short, and the comprehensive cost is low.

The invention belongs to the technical field of catalytic degradation, and particularly relates to a bismuth cluster / CTF composite photocatalyst and a preparation method and application thereof. The bismuth cluster and CTF are compounded through a hydrothermal method, photocatalytic cracking of lignin can be achieved, efficient separation of photo-induced electrons and holes of the photocatalyst can be achieved, fine adjustment of the electron structure of the photocatalyst is achieved by adjusting the addition amount of the bismuth cluster precursor, generation of h < + > and. O < 2-> in the photocatalytic process is improved, and the photocatalytic performance of the photocatalyst is improved. Therefore, the yield of the aromatic monomer prepared by cracking the lignin is improved, the cracking conversion rate can reach 78.5%, the yield of benzoic acid can reach 65.2%, the yield of benzaldehyde can reach 81.4%, the yield of phenyl formate can reach 52.6%, and the method is green, clean and safe.

The invention provides a label-free magnetic self-assembly nanoprobe, a construction method thereof and application of the label-free magnetic self-assembly nanoprobe in detection of PrPC protein. The label-free magnetic self-assembly nanoprobe disclosed by the invention comprises a magnetic Fe3O4 / Fe2O3 (at) Au heteroplasmon nanorod array and a sulfhydrylation aptamer nucleic acid chain which is combined with the magnetic Fe3O4 / Fe2O3 (at) Au heteroplasmon nanorod array through an Au-S bond; a biosensor prepared from the label-free magnetic self-assembly nanoprobe is good in reproducibility and stability; the RSD value of multiple times of detection (intraday / day) is 1.55%; the storage time of multiple groups of sensors is 0-15 days, and the change of response signal values does not exceed 4%; the biosensor has a relatively low detection limit (1pg / mL), a relatively wide linear range (1 * 10 < pg / mL >-1 * 10 < 5 > pg / mL) and relatively good sensitivity, has very good application in detection of PrPC, and has very good practicability.

The invention belongs to the technical field of ammonia synthesis and electro-catalysis, and particularly relates to a preparation method and application of high-entropy alloy aerogel for electro-catalysis. The preparation method comprises the following steps: mixing an inorganic metal salt in a solvent to obtain a precursor solution, quickly adding a reducing agent, standing, and washing and drying the obtained product to obtain the high-entropy alloy aerogel catalyst, the inorganic salt is selected from five or more of copper salt, cobalt salt, iron salt, nickel salt, palladium salt, gold salt, ruthenium salt, platinum salt and silver salt. The three-dimensional continuous porous reticular high-entropy alloy aerogel is obtained through one-step reduction of the inorganic metal salt and standing assembly, the high-entropy alloy aerogel prepared through the method is high in reduction assembly speed, phase separation of multi-component alloy can be effectively inhibited, an amorphous alloy structure is obtained, and therefore when the high-entropy alloy aerogel is applied to ammonia production through electro-catalysis nitrate reduction, the high-entropy alloy aerogel can be used for preparing the high-entropy alloy aerogel. And excellent electrochemical activity and stability can be presented in an ultra-low overpotential range of-0.2 to + 0.2 V vs.RHE.

The present invention provides a four-arm unpacking robot for carton boxes and an automatic unpacking method, wherein the robot comprises a workbench, a horizontal lead screw nut motion mechanism, a vertical bracket, a vertical lead screw nut motion mechanism, a swing flip mechanism and an elastic clamping mechanism; the workbench comprises two horizontal motion mechanism mounting plates and a work platform; the horizontal lead screw nut motion mechanism is mounted on the horizontal motion mechanism mounting plate, and one of the vertical brackets is provided at each end of the horizontal lead screw nut motion mechanism; the vertical lead screw nut motion mechanism and the elastic clamping mechanism are mounted on the vertical bracket; the swing flip mechanism is mounted on the vertical lead screw nut motion mechanism; the swing flip mechanism is used to flip the swing cover of the carton box to open the box; and the elastic clamping mechanism is used to fix the position of the carton box when opening the box. The present invention solves the problem that the prior art cannot automatically unpack the formed carton box.

The invention discloses a preparation method and application of a two-dimensional composite material. The preparation method comprises the following steps: adding MXene into formamide, carrying out ultrasonic dispersion to obtain an MXene formamide dispersion liquid, then adding MgAl LDH into the MXene formamide dispersion liquid, carrying out magnetic stirring, washing with absolute ethyl alcohol, and carrying out vacuum drying to obtain a two-dimensional composite material which is marked as MgAl LDH / MXene. The two-dimensional composite material is used for a lithium-sulfur battery diaphragm barrier layer so as to inhibit the shuttle effect of polysulfide. The preparation method is simple and environment-friendly, and the prepared MgAl LDH / MXene two-dimensional composite material is high in specific surface area, has strong affinity to polysulfide, can promote rapid transmission of lithium ions, can provide an instant electron conduction way for adsorbed polysulfide, is applied to a diaphragm barrier layer of a lithium-sulfur battery, and has a good application prospect. The wettability of the electrolyte on the diaphragm and the conversion of polysulfide are enhanced, the problem of volume expansion in the cycle process of the lithium-sulfur battery is relieved, and the redox reaction kinetics is accelerated.

The invention discloses a heating furnace hearth pressure adjusting method and system, and relates to the technical field of industrial furnaces. The method comprises the steps that a smoke exhaust pipe is arranged at the tail of a heating furnace, smoke in a hearth is led out of the furnace, the temperature of discharged smoke is reduced to be lower than the target temperature through an air heat exchanger, an air mixing cooler is arranged in front of the air heat exchanger to provide protection, and the air mixing cooler is interlocked with the temperature of the smoke in front of the heat exchanger; a pneumatic furnace pressure adjusting valve is arranged on a smoke outlet pipe of the heat exchanger, the smoke outlet end of the furnace pressure adjusting valve is connected with an induced draft fan capable of adjusting the smoke exhaust air volume, a furnace pressure detecting element is arranged on the furnace top of the soaking section of the heating furnace, and the smoke exhaust air volume of the induced draft fan and the opening degree of the furnace pressure adjusting valve are adjusted according to the furnace pressure value. A cold mixing branch pipe is further connected to the pipeline between the furnace pressure regulating valve and the induced draft fan, a cold mixing air valve is arranged on the branch pipe, and the opening degree of the cold mixing air valve is interlocked with the flue gas temperature in front of the induced draft fan; the method is simple, reasonable, easy to implement, sensitive in adjustment, high in precision, wide in application range and capable of achieving wide-range precise adjustment of the hearth pressure.

The present invention discloses a strain of Riemerella anatipestifer phage PT15, a phage composition thereof and its application. The phage PT15 has a deposit number of CGMCC No. 22377 and was deposited in the China General Microbiological Culture Collection Center on April 12, 2021. The present application also provides a phage composition comprising the above-mentioned phage. The above-mentioned phage and phage composition can be used as active ingredients for the preparation of therapeutic drugs and feed additives, and are used in the prevention and treatment of duck bacterial serositis. The phage composition has the advantages of safety, high efficiency and non-toxic side effects, and can be used as an active ingredient of a new type of environmental disinfectant to effectively prevent and control the pollution of breeding environment and feeding facilities, and has good application prospects.

The invention relates to the technical field of environmental restoration, in particular to a core-shell structure nitrided zero-valent iron material obtained through gas-phase thermochemical synthesis as well as a preparation method and application of the core-shell structure nitrided zero-valent iron material. The invention provides a core-shell structure nitrided zero-valent iron material prepared through gas-phase thermochemical synthesis. The core of the core-shell structure nitrided zero-valent iron material is zero-valent iron, and the shell of the core-shell structure nitrided zero-valent iron material is Fe4.4N; the content of zero-valent iron is 60-70wt% based on the mass of the nitrided zero-valent iron material with the core-shell structure. According to the core-shell structure nitrided nano zero-valent iron material obtained through gas-phase chemical thermal synthesis, zero-valent iron is used as a core, and Fe4.4N is used as a shell; the obtained core-shell nitrided nano zero-valent iron material has a more stable surface iron-nitrogen compound, has higher electronic efficiency, and can overcome the problem of rapid passivation of nano zero-valent iron in the repair process.

The invention belongs to the technical field of solid-state lithium metal batteries, and discloses an amorphous inorganic ion conductor and a preparation method and application thereof, and the preparation method comprises the following steps: uniformly mixing lithium tetrachloroaluminate and sodium tetrachloroaluminate to obtain a mixture; and melting the mixture to obtain a molten precursor, and cooling the molten precursor to room temperature to obtain the amorphous inorganic lithium ion conductor Li < x > Na < 1-x > AlCl4, x being greater than or equal to 0.15 and less than or equal to 0.85, wherein the amorphous inorganic lithium ion conductor Li < x > Na < 1-x > AlCl4 is used as an interface phase between a positive electrode of a solid-state lithium metal battery and a solid-state electrolyte. The amorphous LixNa1-xAlCl4 has the remarkable advantages that the preparation temperature is low, the crystal structure of the product can be controlled, the ionic conductivity of the product is high, and the compatibility with a solid electrolyte and a positive electrode material is good. The method is short in preparation period, low in cost and suitable for industrial application.

The invention discloses a preparation method of a self-assembled cellulose diaphragm, a membrane prepared by the self-assembled cellulose diaphragm and application of the self-assembled cellulose diaphragm. The preparation method comprises the following steps: mixing a solvent solution containing cellulose and zinc salt with a solvent solution containing a microporous material, ultrasonically crushing, and forming a membrane to obtain the self-assembled cellulose diaphragm, the cellulose is selected from cellulose nanofibers and / or cellulose nanowires; after the cellulose and the microporous material are uniformly dispersed in the solution, a film-forming base solution of the self-assembled diaphragm can be formed without adding any binder in the film-forming process, and the self-assembled diaphragm has a good film-forming effect. The composite diaphragm provides an effective channel, promotes the transmission of zinc ions in the battery, has smaller internal resistance than a traditional diaphragm, has high electrolyte preservation rate, is smaller than the traditional diaphragm in thickness, and can improve the energy density and cycle performance of the battery. The preparation process of the diaphragm is simple, the reaction condition is mild, the preparation period is short, and the diaphragm is suitable for large-scale industrial production and commercial application.

The invention provides a method for preparing an aluminum-titanium target by combining roll bonding and warm pressing of a waste aluminum-titanium target, and belongs to the technical field of powder metallurgy. The preparation method comprises the steps that the waste aluminum-titanium target is pretreated to obtain aluminum-titanium target semi-finished products, N pieces of aluminum-titanium target semi-finished products are taken, slurry containing aluminum powder is sprayed to the surfaces of the N pieces or N-1 pieces of aluminum-titanium target semi-finished products, and after spraying is completed, the aluminum-titanium target semi-finished products are obtained; and laminating the N aluminum-titanium target semi-finished products to obtain a composite plate, carrying out ply rolling on the composite plate to obtain a composite target material, and carrying out warm pressing on the composite target material to obtain the aluminum-titanium target material. According to the preparation method, the target materials can be fully diffused in the warm pressing process, the influence of the surface flatness on diffusion is reduced through the pre-pack rolling treatment, the aluminum powder serves as a soft middle layer, the good buffering and joint filling effects are achieved, diffusion is promoted, and the target material welding rate is gt in an optimal scheme; 95%. According to the preparation method, the utilization rate of the target material is increased, the production cost of the target material is reduced, and recycling of the target material is achieved.

The invention belongs to the technical field of preparation of nano fluorescent materials, and particularly relates to a preparation method and application of a polymer-based sulfur quantum dot water treatment agent. The preparation method comprises the following steps: (1) adding sulfur powder and a dispersing agent into an alkaline solution to prepare a mixed solution; (2) putting the mixed solution obtained in the step (1) into a water bath at 70-90 DEG C, heating, stirring and reacting for 15-20 minutes, and then adding an etching solvent; and (3) continuously reacting for 5-6 hours until the reaction is finished, adding the etching solvent again, and keeping the temperature for 0.5-1 hour to obtain a brownish red solution which is the sulfur quantum dot water treatment agent. The preparation method of the polymer-based sulfur quantum dot water treatment agent has the advantages of simple process, short preparation time, mild reaction conditions, low energy consumption, low cost and the like, and the prepared fluorescent sulfur quantum dot water treatment agent is simple in component and good in water solubility, can be used for inhibiting mineral scales and bacteria in industrial water, and has good application prospects. The concentration of the water treatment agent is monitored and controlled on line, and industrial production and market application prospects are achieved.

The invention relates to an integrated carbon / carbon composite material crucible containing a pyrolytic carbon transition coating, and belongs to the technical field of thermal field parts for monocrystalline silicon. The crucible comprises a carbon / carbon composite material crucible body, a glassy carbon coating, a pyrolytic carbon transition coating and an yttrium oxide coating, wherein the glassy carbon coating not only has a good combination effect with the carbon / carbon composite material crucible body, but also can prevent carbon from escaping; the thermal expansion coefficient of the pyrolytic carbon transition coating is close to that of the glassy carbon coating, and the combination effect of the pyrolytic carbon transition coating and the yttrium oxide coating is good; the yttrium oxide coating has excellent thermal stability and excellent silicon erosion resistance, and can ensure the purity of molten silicon in the single crystal drawing process; the carbon / carbon composite material crucible body is formed by densifying a carbon fiber prefabricated body which is formed by needling and laying a pure net tire sprayed with resin, and the inner surface of the carbon / carbon composite material crucible body is a net tire which is wholly approximately isotropic, so that the overall mechanical strength of the crucible can be ensured, and a good combination effect of the crucible and a subsequent functional coating can also be ensured.

The invention belongs to the technical field of solid solution nanometer material preparation, and particularly relates to a ruthenium-cobalt solid solution oxide nanofiber material and a preparation method and application thereof. The ruthenium-cobalt solid solution oxide nano-fiber material is prepared by adopting an electrostatic spinning technology in combination with air atmosphere calcination, and the ruthenium-cobalt solid solution oxide nano-fiber material is integrally in a fiber form with a rough and uniform surface, and has more exposed active sites and excellent electron transmission performance. The preparation method provided by the invention is simple and easy to implement, relatively low in cost and short in preparation period, and industrial large-scale production can be realized. The ruthenium-cobalt solid solution oxide nanofiber material prepared by the preparation method disclosed by the invention is used as an electrocatalytic water decomposition bifunctional electrocatalyst, shows excellent hydrogen evolution and oxygen evolution catalytic activity and stability under industrial-grade current density, and realizes efficient, stable, clean and green hydrogen energy production; the defects of low activity, poor stability, high price and the like of an industrial electrocatalyst are overcome, and the method has very high practical application and economic values.

The utility model discloses an expansion kettle support, which comprises an expansion kettle support main body, an expansion kettle and a frame, the upper end of the expansion kettle support main body symmetrically forms support plates through stamping, and the support plates are provided with mounting holes; a first connecting hole, a second connecting hole and a third connecting hole are formed in the side face of the expansion kettle support body, a clamping positioning plate is formed in the middle of the upper end of the expansion kettle support body through stamping, a positioning seat is arranged on the side face of the expansion kettle, and mounting fixing seats are symmetrically arranged on the two sides of the positioning seat. And the mounting fixing seat corresponds to the supporting plate in position, and the positioning seat corresponds to the clamping positioning plate in position, so that the expansion kettle is subjected to double positioning treatment through the supporting plate and the clamping positioning plate. The expansion kettle support is formed by stamping a steel plate, and is simple in structure, short in manufacturing period, low in cost, convenient to assemble and capable of saving manpower, material resources and financial resources.

The invention discloses a magnetic infrared radiation heat dissipation material MnSe2, and a preparation method of the magnetic infrared radiation heat dissipation material MnSe2 comprises the following steps: 1) uniformly mixing manganese powder and selenium powder in proportion, and tabletting the obtained mixed powder to obtain a primary block 2) melting and quenching the obtained primary block under a vacuum condition; 3) grinding the quenched casting body, and tabletting to obtain a secondary block body; and 4) carrying out step-by-step melting annealing on the obtained secondary block under a vacuum condition, and then grinding to obtain the magnetic infrared radiation heat dissipation material MnSe2. Manganese powder and selenium powder are used as main raw materials, the melting quenching process and the step-by-step melting annealing process are combined, the infrared emissivity of the obtained MnSe2 material is promoted to be improved, and particularly, the high emissivity can be shown in the middle infrared band and the far infrared band; when the material is applied to preparation of a MnSe2 composite film, a good radiation refrigeration effect can be achieved, and the material has a good application prospect in the fields of thermal management of microelectronic devices and the like.

The invention relates to the field of preparation of metal nano materials, in particular to a preparation method of an iron-cobalt nano-alloy electrocatalyst, and solves the problems that in an existing iron-cobalt alloy preparation method, the requirement for reaction conditions is high, uniform small particle size cannot be synthesized, and the electrocatalytic performance is low. The preparation method comprises the following steps: uniformly dispersing an iron source and a cobalt source which are used as raw materials in different proportions in a water-alkali-alcohol-organic acid system, heating to a set temperature in a hydrothermal reactor, reacting for a period of time, cooling, cleaning and drying to obtain a cobalt-doped iron oxide precursor; and carrying out heat treatment on the oxide precursor in a tube furnace in a reducing atmosphere, and cooling to obtain the iron-cobalt nano-alloy electrocatalyst (the particle size is 10-20nm). The obtained nano-alloy particles are small in size, uniform in component and high in yield, efficient electrocatalytic reduction of nitrate radicals to prepare ammonia can be achieved in the water environment with the wide potential range, the wide electrolyte concentration and the wide nitrate concentration, and the large-scale application potential is achieved.

The invention discloses a rain-erosion-resistant ceramic-based composite material as well as a preparation method and application thereof, and belongs to the technical field of wave-bearing and wave-absorbing ceramic-based composite materials. According to the preparation method, a BN interface layer is deposited on the surface or in internal gaps of an Al2O3 fiber preform or a SiC fiber preform through a chemical vapor infiltration process, and then a reinforced matrix is introduced into the fiber preform with the BN interface layer through the chemical vapor infiltration process and a polymer impregnation and cracking process. The ceramic-based composite material prepared in the invention has good wave-absorbing performance, mechanical performance and rain erosion resistance; the method can be applied to preparation of aircraft hot end components.

The invention provides a copper-based graphite sealing material for an aero-engine and a preparation method of the copper-based graphite sealing material. The copper-based graphite sealing material can meet the performance requirements of a sealing bush for the aero-engine in different directions. The material is a copper-based graphite sealing material formed by directionally arranging anisotropic lamellar graphite; the material is prepared from the following raw materials in percentage by mass: 60%-70% of copper powder, 18%-32% of iron powder, 6%-12% of graphite, 0.01%-0.5% of silicon dioxide, 0.01%-0.5% of aluminum oxide and 0.01%-0.5% of tungsten disulfide, and the sum of the mass percentages of the components is 100%. The copper powder is irregular electrolytic copper powder, the content of Cu is larger than or equal to 99.9%, and the particle size range is 48-100 microns; the iron powder is porous sponge iron powder, the content of Fe is larger than or equal to 99.9%, and the particle size range is 48-100 microns; the graphite is natural lamellar graphite, the particle size range is 48-100 [mu] m, and the thickness range is 8-18 [mu] m; the particle sizes of the silicon dioxide, the aluminum oxide and the tungsten disulfide are 2-5 microns.

The invention provides a preparation method capable of preparing high-purity ZrC powder on a large scale and ZrC powder.The preparation method comprises the steps that firstly, zirconium metal salt, deionized water, organic ligands and absolute ethyl alcohol are subjected to ultrasonic mixing, and a metal salt solution and an organic solution are obtained; pouring the organic solution into the metal salt solution to form a mixed solution, and ultrasonically removing gas in the solution; dropwise adding a small amount of ammonia water into the mixed solution, shaking, performing ultrasonic treatment to enable the solution to be uniform, and standing for a period of time to obtain metal organic gel; centrifugally cleaning the gel, and drying the cleaned gel in a drying oven at a certain temperature to obtain dry gel powder; and finally, putting the dry gel powder into a graphite crucible, and carrying out high-temperature cracking in a vacuum carbon tube furnace to obtain the high-purity ZrC powder. Impurities are prevented from being introduced into a traditional ball milling process, the metal organic gel can achieve uniform combination of metal ions and organic ligand atoms, the ZrC powder is endowed with the excellent characteristics of 50-200 nm nanoscale size, high purity, uniform distribution, spherical morphology and the like, and meanwhile the preparation method is short in period, low in temperature, low in cost, environmentally friendly in raw material and suitable for industrial production. The method is easy to control and suitable for large-scale preparation.

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

The invention relates to a high-entropy oxide wave-absorbing ceramic powder material as well as a preparation method and application thereof, belongs to the technical field of electromagnetic wave absorbing materials, and solves the problems of poor high-temperature resistance and oxidation resistance and low absorption efficiency on low-frequency wave bands of an existing electromagnetic wave absorbing material. The high-entropy oxide ceramic material has a perovskite structure, the molecular structure is ABO3, A comprises La and Sr, and B is at least five elements of Cr, Ni, Mn, Fe, Co, Zr, Hf and Ti. According to the invention, the high-entropy oxide is combined with the perovskite structure, the electromagnetic function of the high-entropy oxide ceramic material is accurately regulated and controlled, and effective absorption of low-frequency electromagnetic waves is realized; the material has oxidation resistance and thermal stability under a high-temperature condition, and excellent electromagnetic function strength of the material at a high temperature is maintained. According to the high-entropy oxide ceramic powder material, the range of an electromagnetic wave absorbing material is widened, the environmental adaptability is improved, and higher requirements of development of a communication technology on the electromagnetic wave absorbing material are met.

The invention belongs to the technical field of oil-water emulsion demulsification, and provides a magnetic nano demulsifier as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving polydopamine in a phosphate buffer solution to obtain phosphoric acid polydopamine; the preparation method comprises the following steps: mixing phosphoric acid polydopamine with Fe3O4, and stirring under dark and aerobic conditions to obtain a Fe3O4 and polydopamine compound; and dissolving the compound in a phosphate buffer solution, mixing with block polyether, and stirring under ultraviolet irradiation and aerobic conditions. The invention also discloses the magnetic nano demulsifier prepared by the method and application of the magnetic nano demulsifier in oil-water emulsion treatment. The surfactant is firmly fixed on the surfaces of the magnetic nanoparticles through polydopamine, so that surface activity modification is realized, the surface wettability of the demulsifier is improved, the demulsifier is prevented from falling off, and the repeated utilization rate of the demulsifier is increased. The demulsifier has excellent demulsification efficiency and cyclic utilization performance, and has important application value and development potential in the field of emulsified oil treatment.

The invention discloses an anisotropic ablation-resistant thermal insulation material, a preparation method and application, and the anisotropic ablation-resistant thermal insulation material is prepared from the following raw material components in parts by weight: 100 parts of matrix rubber, 20-50 parts of ablation-resistant filler, 5-10 parts of organic fiber, 5-10 parts of inorganic fiber and 1-5 parts of vulcanizing aid. The anisotropic ablation-resistant thermal insulation material provided by the invention is better in ablation performance, shorter in preparation period, lower in cost and higher in interface bonding reliability, the oxyacetylene line ablation rate is 0.001-0.005 mm / s, the mass ablation rate is 0.03-0.06 g / s, and when the anisotropic ablation-resistant thermal insulation material is used as an engine shell thermal insulation layer, an engine shell can be effectively protected when an engine works. According to the method, the multi-layer thermal insulation material is prepared through continuous layered co-extrusion, layered lamination, calendaring and shaping, cutting and mold pressing, layered lamination has shearing, stretching and compressing effects on a rubber material, fiber orientation in the rubber material is promoted, and finally, the layers of the prepared anisotropic ablation-resistant thermal insulation material are well attached, so that the thermal insulation performance of the material is improved, and the service life of the material is prolonged. Defects are not easy to form on an interlayer interface.

The invention relates to a preparation method of a high-strength SiC-based composite ceramic material, which comprises the following steps: (1) mixing SiC powder, WC powder, an aluminum source and a carbon source to obtain mixed powder; and (2) carrying out hot pressed sintering on the mixed powder to obtain the high-strength SiC-based composite ceramic material.