113results about How to "Adjust porosity" patented technology

The invention relates to an aeroengine case seam allowance size repairing method. The porosity and hardness of a coating and the content of oxides in the coating can be effectively adjusted by controlling the plasma spraying power and the heating process of spraying powder during flying, and heat stress of the coating is reduced. The hardness and thermal expansion coefficient of the prepared nickel-aluminum coating are equivalent with those of a case, the bonding strength of the coating is far higher than the stress strength of a case seam allowance under the given working condition, and the use working condition of the aeroengine case can be met.

The invention discloses a silicon-based cathode composite material for a lithium ion battery and a preparation method thereof. The cathode composite material is a Si/CuOx/C composite material (0<=x<=1) with a porous structure. Silicon with a porous structure is used as a base, and CuOx particles are inserted in the pores, and carbons with different forms are distributed on a surface and pore walls of the silicon-based material. The preparation method of the cathode composite material comprises steps that silicon material realizes pore-forming through an in situ catalytic reaction between silicon and halogenated hydrocarbon, and reaction condition parameters are regulated to control pore size, distribution and amount of porosity of the silicon material; a post-modification technology is employed to carry out modifications on the surface and the pore walls of the porous silicon, so as to obtain the Si/CuOx/C composite material with a porous structure. The porous silicon-based cathode composite material has low production costs, simple process and no pollution, and is suitable for industrialized production; besides the porous silicon-based cathode composite material has high charge and discharge capacity, small initial irreversible capacity and good cycle performance.

The invention discloses a silicon carbide/copper silicon alloy codual-continuous composite and a preparation method thereof. The composite material comprises the following components in volume fraction: 35-50 percent of porous silicon carbide ceramics and 50-65 percent of copper silicon alloy, wherein the atomic percentage composition of silicon in the copper silicon alloy is 15-40 percent. The preparation method comprises two key processing steps of: preparing the porous silicon carbide ceramics and vacuum infiltrating porous silicon carbide through the copper silicon alloy. Silicon is adopted as an alloying element of copper, so that the problems of wettability and reactivity between copper and silicon carbide are solved simultaneously. In addition, the invention adopts a vacuum infiltrating process as a near net forming preparation process, and specialized die casting equipment and a specific module are not needed, so that the preparation process is simple, has low cost, and can be used for manufacturing various composites with complicated shapes.

A preparation method for calcium polyphosphate-tricalcium phosphate bone bracket comprises the steps of proportionally ball-milling and mixing calcium phosphate ceramic powder, size stabilizer methylcellulose, surfactant polyvinyl alcohol, foaming agent hydrogen peroxide and de-ionized water in order to prepare compound ceramic slurry, pouring the slurry into a mould, drying in an oven with four-step drying method, and then sintering the dried green body under high temperature in order to acquire porous calcium phosphate ceramic bracket. The big aperture of a big pore of the acquired porous calcium phosphate ceramic bracket of the invention is 200 to 600 microns, the micro-pore aperture thereof is 2 to 5 microns, the whole porosity thereof is from 60 to 90 percent and the compressive strength thereof is 0.5 to 7.0 Mpa. Furthermore, the method has low cost and high efficiency and can be applied to large-scale production.

The invention discloses a preparation method of a corn alcohol-soluble protein nanofiber membrane used for cell culture. The corn alcohol-soluble protein/polyvinyl alcohol nanofiber membrane is a cell culture carrier material, which comprises biodegradable natural polymer corn alcohol-soluble protein and polyvinyl alcohol as a biocompatible high polymer. The transverse dimension of a ribbon-like corn alcohol-soluble protein/polyvinyl alcohol nanofiber is 625 to 3,920 nanometers; and the nanofibers are stacked into the nanofiber membrane randomly. The corn alcohol-soluble protein/polyvinyl alcohol nanofiber membrane is made through electrostatic spinning process, the preparation method is simple and effective, preparation equipment is simple, the stability is high, and indexes such as the diameters of the nanofibers and the porosity of a membrane material and the like can be regulated through changes of the condition of the electrostatic spinning process. The experiment proves that compared with a common PC (polycarbonate) plate, the corn alcohol-soluble protein nanofiber membrane material contributes to proliferation of mouse embryonic stem cells, and the diameter of the stem cell clone cultured for 5 days reaches 100 micrometers. Moreover, the nanofiber membrane can be recycled after being steamed and pressed for 30 minutes at 120 DEG C.

The invention discloses a preparation method of a hyperelastic porous CuAlNi high temperature shape memory alloy, which comprises the following steps: preparing a CuAlNi alloy ingot by adopting an electric arc melting or induction melting method; pressing NaAlO2 powder into a green body and sintering the green body in the air atmosphere to obtain an NaAlO2 block body; placing the NaAlO2 block body into the bottom of a tubular furnace capable of moving up and down, placing the CuAlNi alloy ingot on the NaAlO2 block body and carrying out heat preservation in the vacuum atmosphere; and then filling protection gas, keeping filling the protection gas, removing the tubular furnace downwards out of a heating region, cooling the obtained product, immersing the cooled product into weak acid to carry out ultrasonic oscillation, then placing the product into a vacuum furnace, carrying out heat treatment on the product in the protection atmosphere and quenching into ice water to obtain the hyperelastic porous CuAlNi high temperature shape memory alloy. The porous CuAlNi shape memory alloy prepared by the preparation method has excellent hyperelasticity and mechanical property at high temperature and also shows excellent cycling stability.

The invention discloses a method for preparing low-oxygen aluminum nitride powder by auto-igniting synthesis, which is characterized in that the method comprises the processing steps of treating raw materials, compounding, mixing, reacting and finishing. The synthesized aluminum nitride has high nitrogen content, low oxygen content and fine granularity; and is suitable for producing high-heat conductive aluminum nitride ceramic base plates, ceramic insulating radiation fins and aluminum nitride-based structural ceramics. Owing to much higher heat conductivity of aluminum nitride than common ceramic materials, the aluminum nitride powder is also generality used as a raw material for producing ceramics. The aluminum nitride powder obtained by auto-igniting synthesis has the advantages of high purity, fine granularity, narrow particle size distribution, high sintering activity, and the like. Furthermore, the invention and is especially suitable for sintering high-heat conductive aluminum nitride ceramics.

The invention provides a method for preparing an electrode of ZIF-derived CoMoO4. the method is characterized in that the method uses a high temperature calcined ZIF-67 as a precursor to prepare CoMoO4 by hydrothermal method., that steps are as follow: (1) molybdate and a compound containing a Co salt are taken and stirred in deionized water until the molybdate and the compound contain the Co saltare dissolved; (2) a small amount of ZIF-67 power are added, stirred to a homogeneou solution; 3, that mixture is transferred to a reaction kettle, and the mixture is cooled to room temperature afterreaction for 2h; (4) alternately cleaning and drying are performed for 24h; (5) Ultrasonic cleaning is performed for 30 min, deionized water cleaning and ultrasonic are performed, drying is performedfor 12 h; 6) that graphite paper is dried at constant temperature, the required material is ground in a mortar, a small amount of solvent is added, uniformly dropping on the dried sheet layer, and then drying is performed, and 7) a regular-shaped electrode of ZIF-derived CoMoO4 is performed. The invention overcomes the problems of poor stability and small specific capacitance of metal oxide electrode in the prior art, and provides a preparation method of CoMoO4 derived from metal oxide electrode material ZIF with high specific capacity and good stability.

The invention provides a preparation method of a multilayered gradient ceramic membrane. According to the method, ceramic membrane slurry having different chemical components and grain sizes is printed on a flat plate type ceramic membrane supporting body by adopting a silk-screen printing technology and is commonly sintered with the flat plate type ceramic membrane supporting body once, so that the multilayered gradient ceramic membrane having different chemical components and pore structures is formed on the surface of the supporting body. With the adoption of the silk-screen printing technology, the thickness of a single-layer membrane can be controlled in a range of 10-30 microns, and the thickness is uniform and consistent; and the technical difficulties that a dip-coating-method membrane layer is relatively thick and the thickness of a spraying-method membrane layer is not uniform are effectively overcome. The multilayered gradient ceramic membrane is composed of more than three layers of membrane materials having the different chemical components and grains, so that the multilayered gradient ceramic membrane has different coefficients of thermal expansion, porosities and average pore diameters; thermal stress, caused by unmatched expansion coefficients, between the supporting body and the membrane layer is alleviated well; and the binding strength of the membrane layer and the supporting body is improved, and the filtration flux of the membrane layer is increased. The multilayered gradient ceramic membrane is long in service life and low in preparation cost, saves energy and is environmentally friendly.

The invention discloses a three-dimensional-structured silk fibroin/hydroxyapatite composite stent and a preparation method thereof. The preparation method of the three-dimensional-structured silk fibroin/hydroxyapatite composite stent comprises preparing silk fibroin/hydroxyapatite composite powder uniform in size through biomimetic mineralization; then through the three-dimensional printing technology, precisely controlling the appearance of the composite stent and the shape, size and connectivity of internal holes to obtain the special three-dimensional-structured silk fibroin/hydroxyapatite composite stent applicable to bone tissue engineering for facilitating cell growth and ossification. The three-dimensional-structured silk fibroin/hydroxyapatite composite stent has the advantage of achieving one stent in one structure and is a bone repair composite material stent high in porosity and pore connectivity and controllable in mechanical property, thereby being beneficial to osteogenic induction and differentiation and cell adhesion, migration and proliferation and capable of creating microenvironment meeting growth demands of osteoblasts. The three-dimensional-structured silk fibroin/hydroxyapatite composite stent is simple and practicable in preparation, low in process and equipment requirements, easy to control of experiment parameters and capable of promoting popularization and application of the three-dimensional printing technology in the biological field.

The invention relates to a preparation method of lamellar porous graphene oxide. The preparation method comprises the following steps: (1) dissolving graphene oxide and a binding agent into water to prepare a precursor solution; (2) putting the precursor solution into a container and carrying out a bidirectional freezing reaction to obtain an intermediate product, wherein a wedge-shaped device is arranged at the bottom of the container; (3) freezing and drying the intermediate product obtained by the step (2) to remove a solvent, so as to obtain the lamellar porous graphene oxide. The invention further relates to the lamellar porous graphene oxide. The method is simple to operate; the lamellar porous graphene oxide prepared by a bidirectional freezing method has a regular large-area and biaxial orientated lamellar porous structure.

The invention belongs to the technical field of weather-resistant steel surface pretreatment, relates to corrosion of weathering steel materials in an atmospheric environment, in particular to a stabilizer for promoting the formation of a weather-resistant steel rust layer and a preparation method of the weather-resistant steel rust layer. The stabilizer comprises the following components of, nanoalpha-FeOOH, nano gamma-FeOOH, nano Fe3O4, CuSO4, Cr2(SO4)3, water-based acrylic acid and water; the nano alpha-FeOOH, the nano gamma-FeOOH, the nano Fe3O4, the CuSO4 and the Cr2(SO4)3 are uniformlydispersed in an aqueous acrylic acid aqueous solution; and the nano alpha-FeOOH, the nano gamma-FeOOH and the nano Fe3O4 can induce rust layer nucleation, meanwhile, the surface of the weather-resistant steel can be uniformly corroded in the service process through the characteristics of the water-permeable and oxygen-permeable stabilizer coating, and meanwhile, uniform corrosion causes uniform shedding of the rust layer stabilizer, so that the color of the weather-resistant steel structure is more uniform.

The invention discloses a corundum-spinel light-weight refractory material and a preparation method thereof. The prepared corundum-spinel light-weight refractory material forms density gradient and combination intensity gradient of a substrate part under the situation that low thermal conductivity is maintained, and high-temperature use performance is improved. The preparation method includes the steps that magnesite and carbon are selected as raw materials, a compressed sample is placed into an atmosphere sintering furnace, the controllable atmosphere sintering furnace is subjected to vacuumizing, then Ar is inflated for protection, a furnace body is heated to a certain temperature, O2 is introduced, magnesite and carbon are subjected to a carbon thermal reduction reaction, Mg steam is generated, the Mg steam is diffused and reacts with introduced O2 to generate magnesium oxide, magnesium oxide reacts with alumina micro powder to generate spinel, and the substrate part of the sample is combined. The corundum-spinel light-weight refractory material and the preparation method have the advantages that the sintering temperature is low, sample porosity and volume density are adjustable, and compression strength and the load softening temperature are high.

The invention relates to the technical field of hermetia illucens breeding, in particular to an environment-friendly breeding method of hermetia illucens by utilizing kitchen garbage. The environment-friendly breeding method of hermetia illucens by utilizing kitchen garbage comprises the following steps: S1, collecting kitchen garbage, removing impurities, filtering out excessive moisture and grease, and performing crushing and pulping; S2, uniformly mixing obtained kitchen garbage slurry with auxiliary materials according to a mass ratio of (8-20):1; S3, spreading the fermented mixed slurry in a culture box, inoculating hermetia illucens larvae, and using the hermetia illucens larvae to eat the mixed slurry; S4, separating the hermetia illucens larvae from hermetia illucens excrement before entering a pre-pupa stage; and S5, preparing the fresh hermetia illucens larvae into a feed and thoroughly decomposing the excrement to be used as an organic fertilizer. The provided environment-friendly breeding method of hermetia illucens by utilizing kitchen garbage can realize resource utilization and improve the economic benefit of the kitchen garbage, and also can improve a survival rateand the output value of hermetia illucens larvae.

The invention discloses a method for preparing super thermal isolation polymer materials from polymer nanometer hollow capsules. According to the method, firstly, hydrophilic and oleophilic macromolecular reversible addition fragmentation chain transfer reagents are used for preparing polymer nanometer capsules, then, inter-capsule cross linking agents are prepared, finally, the inter-capsule cross linking agents and the polymer nanometer capsule emulsion are mixed according to a mass ratio of capsule to inter-capsule cross linking agents of 2.5:1 to 0.8:1, the pH is regulated to be 3.0 to 6.8, the reaction lasts 30 minutes to 24 hours at the temperature being 60 to 90 DEG C, the emulsion is gelatinized, then, core paraffin wax in the nanometer capsules is replaced through tetrahydrofuran, and polymer nanometer porous materials are obtained through vacuum drying. The method has the advantages that the preparation process is simple, and the porosity and the pore size can be regulated through changing the solid content of the nanometer capsule emulsion, the consumption of etherified melamine formaldehyde resin and the self porosity of the nanometer hollow capsules. In addition, compared with the traditional thermal isolation materials, the porous materials have high mechanical strength.

The invention discloses a periclase-spinel light-weight refractory material and a preparation method thereof. The refractory material has gradient density from the exterior to the interior, wherein the exterior is a compact external layer and the interior is porous. The compact external layer enables the material to have a performance of resisting work medium infiltration and the inner porous material enables the material to have a heat insulation performance. The preparation method includes the steps of: 1) with magnesite and carbon as reaction raw materials, pressing a test sample and placing the test sample in an atmosphere sintering furnace; 2) vacuumizing the atmosphere-controllable furnace, feeding air for protection, heating the furnace to certain temperature and feeding oxygen so that the magnesite and carbon are subjected to carbon thermal reduction to generate magnesium vapor; and 3) generating magnesium oxide by diffusing the magnesium vapor to contact with the oxygen, wherein the magnesium oxide generated through oxidization or the spinal generated through the reaction enables a matrix part of the sample to be combined. The material is low in sintering temperature, is adjustable in sample porosity and volume density, and is high in compression strength and refractoriness under load.

The invention discloses a turbulent flow regulating and controlling external particle fluidized bed uniform in turbulence degree and belongs to a mineral separation device. The device comprises a column floating area, a concentrate overflow groove in the upper portion of the column floating area and a middling ore circulating port outside the column floating area; the lower portion of the column floating area is provided with a gas and liquid mixing area; a fluidized bed mineralizing and floating area is arranged between the column floating area and the gas and liquid mixing area; the fluidized bed mineralizing and floating area is provided with a mineralizing area 1, a mineralizing area 2,... and a mineralizing area n; and the interiors of the mineralizing area 1, the mineralizing area 2,...and the mineralizing area n are filled with turbulent flow regulating and controlling particles. According to the turbulent flow regulating and controlling external particle fluidized bed uniform in turbulence degree, mineralizing and floating are totally separated, and are different from current integration of mineralizing and floating; the mineralizing time can be achieved by adjusting the mineralizing area segment number of the fluidized bed mineralizing and floating area, and therefore the kinetic energy utilizing efficiency is very high; the energy dissipating rate is high, the bubble size balance and stable retention of high-pressure gas are guaranteed, and the floating recovery rate is increased; and upper, middle and lower mineralizing fluidized bed layers are provided with different turbulence degrees, and the mineralizing efficiency is high.

The invention discloses a silane coupling agent modified artificial graphite resin-based brake pad and a manufacturing method of the silane coupling agent modified artificial graphite resin-based brake pad. Materials comprise phenolic resin, rubber and organic friction powder, short cut steel fibers, red copper fibers, aramid fibers, high-aluminum ceramic fibers, mineral fibers, silane coupling agents, graphite, composite fillers and the like. The manufacturing method of the silane coupling agent modified artificial graphite resin-based brake pad includes the steps that the silane coupling agents are used for modifying the artificial graphite first, the materials are weighed in sequence and added into a high-speed mixer to be uniformly mixed, pressing and heat curing treatment are conducted according to the dry method one-shot forming method for traditional resin-based friction materials, and finally machining, ceramic treatment and inspecting packaging are carried out. The silane coupling agent modified artificial graphite resin-based brake pad manufactured according to the method has the advantages of being large in braking torque, comfortable and stable in emergency braking, free of obvious degeneration and noise and less in dust fall. The production method is simple and environmentally friendly. The silane coupling agent modified artificial graphite resin-based brake pad is especially suitable for urban bus air disk brakes and has broad market prospects.

The invention relates to a high-temperature heat insulation fire-resistant fiber, a fabric, a preparation method and an application. The high-temperature heat insulation fire-resistant fiber is a polyimide porous fiber and has an axial orientation hole structure. The preparation method includes the steps: 1) performing solution spinning on polyamide acid saline gel, performing directional freezingduring spinning and collecting frozen fibers; 2) freeze-drying the frozen fibers and removing ice crystals to obtain the porous fiber with the orientation hole structure; 3) performing thermal amidation on the porous fiber to obtain the polyimide porous fiber. The preparation method is simple and suitable for industrial amplification application and can realize continuous large-scale preparation.

The invention belongs to the technical field of meso-porous materials, and concretely relates to a method for preparing a large-area uniform nano-porous gold film through treating graphene as a template. A gold nanoparticle/graphene composite material film adopted as a raw material can be obtained through a heating reaction in water through a one-step process, the template graphene is removed through adopting two annealing modes comprising direct calcining in air at 600-800DEG C or heating in nitrogen to 600-800DEG C and instant exposure to air, and the nano-porous gold film material having the characteristics of large area, uniformity and different microstructures can be prepared. The poriness of the nano-porous gold film can be adjusted through adjusting the proportions of the two components in the gold nanoparticle/graphene composite material film. Compared with traditional methods for preparing nano-porous gold films through treating colloidal particles as a template or through an alloy removal process, the method provided by the invention has the advantages of simple operation process, mild preparation conditions, nontoxic and environmentally-friendly reagents, and effective control of the morphology of the nano-porous structure, so the method has a wide application prospect.

The invention discloses a quick seedling culturing matrix. The seedling culturing matrix comprises the components in parts by weight: 55 parts of pine sawdust, 30 parts of dishcloth gourd sponge, 8 parts of kaolin, 15 parts of field soil, 4 parts of an inorganic fertilizer, 4 parts of Chinese herbal medicines, and 5 parts of soybean milk. The quick seedling culturing matrix disclosed by the invention uses the pine sawdust and the dishcloth gourd sponge as main raw materials, on one hand, the raw materials are wide in sources and low in cost, and on the other hand, the probability that the matrix using cow dung and chicken manure as the raw materials pollutes environment is also reduced; the soybean milk is added, so that the fertilizer effect of the matrix is improved, plants are easy to absorb the fertilizer effect, and the growth and the development of the plants are promoted. The dishcloth gourd sponge is used as the raw materials of the matrix, so that the matrix can provide nutrient substances, the porosity of the matrix can also be regulated, and the water percolating capacity of the matrix is improved. The Chinese herbal medicines deployed in a fixed proportion provide the fertilizer and can also improve the disease resistance of the plants.

The invention belongs to the field of nano material preparation, and particularly relates to a nano porous surface plasmon crystal and a preparation method thereof. The preparation method of the nanoporous surface plasmon crystal is provided aiming at the problems that the optical performance of a surface plasmon crystal prepared through an existing method is poor and needs to be improved. The preparation method includes the following steps that a, nano particle suspension liquid is prepared into singly dispersed nano particles; b, the nano particles are assembled on the surface of a substrate, and a regular two-dimensional hexagonal close-packed nano particle array is formed; c, annealing treatment is carried out; d, an alloy thin film is deposited on the surface of the two-dimensional particle nano array, and a metal alloy hemispherical shell array is formed; e, dealloying treatment is carried out, and a nano porous metal hemispherical shell array structure is formed. The preparation process is simple, the equipment requirement is not high, the cost is low, the prepared nano porous surface plasmon crystal has more excellent optical characteristics, and obvious economic benefitsare achieved.

The invention relates to the technical field of medical device design, and discloses a porous stent for bone repair. The porous stent comprises a plurality of structural units; the outer contour of each structural unit is in a regular quadrangular prism shape, the bottom side length of the regular quadrangular prism is a, and the height is h; each structural unit comprises supporting beam columns,a central beam column and connecting rods, wherein the supporting beam columns are arranged at the four side edges of the regular quadrangular prism respectively, the central beam column is arrangedat the center of the regular quadrangular prism and is parallel to and flush with the supporting beam columns, the connecting rods are correspondingly arranged between the supporting beam columns andthe central beam column, and the cross-sectional radius of the supporting beam columns and the cross-sectional radius of the central beam column are both R; the structural units are arrayed to form the porous stent. The invention also provides a preparation method of the porous stent for bone repair. The porous stent has the advantages of high porosity, low elasticity modulus, high bearing capacity and the like.