161results about How to "Good microscopic appearance" patented technology

The invention discloses high-strength lithium disilicate glass ceramic and a preparation method thereof. The glass ceramic comprises the following chemical components in percentage by weight: 59-80% of SiO2, 10-18% of Li2O, 0.1-14% of MgO, 0-15% of Al2O3, 1-8% of P2O5, 0-5% of Na2O, 0-7% of CaO, 0-9% of K2O, 0.5-8% of stabilizer and 0-10% of colorant, wherein the stabilizer is selected from one or more of ZrO2, SrO, BaO and Y2O3, and the colorant is selected from one or more of Eu2O3, CeO<+>, Tb4O7, La2O3, Ta2O5, MnO2 and Fe2O3. The lithium disilicate glass ceramic is a material which contains a residual glass phase, a Li2Si2O5 principal crystalline phase and a small quantity of Li3PO1, quartz, cristobalite, zirconium oxide or magnesium-aluminum silicate phase and is prepared by controlling nucleation and crystallization processes after carrying out heat treatment on lithium disilicate matrix glass. The lithium disilicate glass ceramic is very high in bending strength and fracture toughness and favorable in translucence and chemical stability and can serve as a full-ceramic dental material applied to the field of dental restoration.

The invention discloses a fibre-polymer compound toughened concrete and a preparation method for the same. The basic raw materials of the concrete are coarse aggregate, fine aggregate, portland cement, fly ash and a polycarboxylic water reducer; moreover, fibres and a polymer are added, the fibres are any one of end-hook type steel fibres, superfine type steel fibres, modified polyester fibres, polyvinyl alcohol fibres, basalt fibres and cellulose fibres, and are doped in a ratio that the volume doped amount in per 1 m<3> concrete is 0.08%; and the polymer is any one of ethylene-vinyl acetate copolymer, ethyl acrylate, styrene-acrylate copolymer, vinyl acetate-acrylate copolymer and organosilicone acrylate, and the doped amount of each polymer is 10% based on the mass of the portland cement and the fly ash. The preparation method comprises the following steps of: pouring stone, sand, a gelling material, fibres, and water dissolved with a water reducer, and then stirring according to a blending mode of pouring dry materials at first and then pouring wet materials; and pouring the polymer, and stirring and forming.

The invention provides a rare earth permanent magnetic material. The rare earth permanent magnetic material comprises a primary phase and a secondary phase, and the secondary phase is isolated from the primary phase or the secondary phase covers the periphery of the primary phase. The primary phase is composed of R1x1R2y1Fe(100-x1-y1-z1-w1)Coz1Bw1N1g1; R1 is selected from Pr or/and Nd, R2 is selected from at least one of Dy, Tb and Ho, 26wt%<=x1+y1<=36wt% and 0.01wt%<=y1<=10wt%; the secondary phase is composed of R3x2R4y2Fe(100-a-b-c-v-u)Coz2Bw2N2g2, R3 is selected from at least one of Pr, Nd, Dy and Tb, R4 is Ho, 35wt%<=x2+y2<=65wt% and 0.01wt%<=y2<=20wt%. The rare earth permanent magnetic material is prepared in a dual-alloy mode, is low in cost, strong in coercive force and high in magnetic induction, and a magnet of a smaller size can be used when the rare earth permanent magnetic material is applied to a motor,.

The invention discloses a making method of fluorescent powder of yttrium aluminium garnet, which comprises the following steps: allocating certain quantity of alumina powder, yttrium nitrate, cerous nitrate and gadolinium nitrate into sediment mother liquid; allocating sediment agent solution through at least one of NaOH, NH3.H2O or NH3HCO3; maintaining sediment mother liquid temperature between 10 and 70 deg.c; stirring evenly; adding sediment agent solution into sediment mother liquid; stopping adding sediment agent when pH value is 6.8-11; insulating and stirring; separating solid from liquid of sediment mother liquid; washing solid through clean water; drying; adding fluoride in the powder as reacting adjuvant; placing blended powder into high-temperature stove; heating protected by gas; cooling; obtaining sintered fluorescent powder bulk; grinding; sieving; obtaining the product.

The invention discloses a high-voltage single crystal ternary material and a preparation method thereof. The chemical formula of the high-voltage single crystal nickel-cobalt-manganese ternary material in the invention is LiNi0. 5Co0. 2Mn0. 3MxO2, wherein x=0. 01-0.1, coprecipitating Ni-Co-Mn hydroxide coprecipitate body is formed by coprecipitation method, and then proper amount of lithium carbonate or lithium hydroxide is added to form lithium carbonate or lithium hydroxide-Nickel cobalt manganese hydroxide co-sediment mixed paste, mixed with paste, evenly mixed, dried, ground, sieved with 160 mesh sieve, the obtained mixture is loaded into an alumina crucible, put into an oxidation furnace for burning, and the firing temperature is controlled at 900-1050 DEG C, heat preservation 10-15 hour, that sintered body is subject to crushing, airflow classification, surface coating treatment of the alumina sol and low-temperature atmosphere heat treatment to obtain a high-voltage monocrystalline nickel-cobalt-manganese ternary material powder. The invention has the characteristics of good electrochemical characteristics under the high-voltage condition, excellent micro-morphology, simplemanufacturing method and easy industrial production.

The invention belongs to the technical field of carbon nanometer materials, and discloses an alkali lignin carbon nanometer sphere, a preparation method and an application thereof. The preparation method is as follows: using N, N-dimethylformamide or glacial acetic acid as a solvent, configuring an alkali lignin electrostatic spray solution with a mass fraction of 20% to 50%, and then transferring it to an electrostatic spraying device , the alkali lignin nanospheres are obtained by electrostatic spraying, and then the alkali lignin nanospheres are pre-oxidized at a temperature of 250-280°C, and finally carbonized at a temperature of 400-900°C to obtain alkali lignin carbon nanospheres. The invention uses low-cost, renewable and degradable commercial alkali lignin as a carbon source, and has the advantages of energy saving and environmental protection. The obtained alkali lignin carbon nano-microspheres have good microscopic appearance and good dispersion performance, which improves the use performance of the lignin carbon material.

A method for preparing a special molybdenum powder relates to a method for preparing the molybdenum powder specially used for the industries of thermal spraying and machining as well as pressing fine apparatuses. The powder is characterized in that the preparing process includes the steps as follows: (1) sintering normal molybdenum powder for increasing the granularity; (2) grading the molybdenum powder, the granularity of which is increased; carrying out spheroidisation on the molybdenum powder with approximate granularity by a plasma device, then cooling and collecting the molybdenum powder; (3) reducing the molybdenum powder after being spheroidized, screening, grading and then obtaining the special molybdenum powder. The molybdenum powder prepared by the method of the invention has the advantages of good fluidity, simple technique, high finished product rate and relates to a technique for preparing the special molybdenum powder used in the fields of thermal spraying and pressing fine apparatuses.

The invention discloses a method for preparing spherical molybdenum powder. The method includes the following steps: pulverizing the molybdenum powder; preparing polyvinyl alcohol aqueous solution; adding the pulverized molybdenum powder into the polyvinyl alcohol aqueous solution, stirring the solution to be even and preparing the solution to be sizing agent; performing spray drying on the sizing agent to obtain granulation powder; and firstly performing ungrease treatment on the granulation powder, secondly performing heat treatment on the granulation powder, and eventually performing crushing and sieving to obtain the spherical molybdenum powder. The method for preparing the spherical molybdenum powder is simple in process, low in cost, high in finished product rate, and wide in application range. By adoption of the method, the microstructure of the molybdenum powder can be effectively improved, the properties including apparent density, mobility and the like of the powder can be improved, the apparent density of the prepared spherical molybdenum powder is 2.0-4.5g/cm<3>, the mobility is 15s/50g-30s/50g, the quality purity is larger than or equal to 99.95%, and the finished product rate is larger than or equal to 90%.

A preparation method for yttrium gadolinium europium oxide red fluorescent powder applicable to a 3D PDP (Plasma Display Panel) comprises the steps as follows: a rare earth oxalate coprecipitation body is prepared by adopting a coprecipitation method, rare earth metal oxide is balanced and dissolved in nitric acid or chlorhydric acid to form a rare earth metal salt solution; an oxalic acid solution or a carbonate solution is prepared and added into the rare earth metal salt solution to obtain rare earth metal oxalate or a carbonate precipitate; the carbonate precipitate is filtered and isolated, dried and burned to obtain a rare earth oxide coprecipitation body; the coprecipitation body is oxidized and burned to form a yttrium gadolinium europium oxide red fluorescent powder burned body; the rare earth oxide coprecipitation body is added with a cosolvent and is loaded in an aluminum oxide crucible and is burned under high temperature in an oxidizing furnace; after burned, the rare earth oxide coprecipitation body is shattered after burning to obtain a yttrium gadolinium europium finished product; and finally, the yttrium gadolinium europium oxide red fluorescent powder is obtained according to a downstream treatment process. The fluorescent powder prepared according to the method has the advantages of high lighting brightness, good color purity, complete crystal morphology, small powder center particle size, simple manufacturing method and low production cost, and is suitable for industrial production.

The invention relates to a method for material concentrating in a ternary precursor synthesis reaction. According to the method, a reaction vessel, a negative-pressure tank and a mother liquor tank are connected sequentially; a stirrer, a guide flow cylinder, a charging pipe, a nitrogen gas guide pipe, a liquid level meter, a clear-out pipe and a filter stick are arranged inside the reaction vessel; a vacuum pump is arranged at the top of the negative-pressure tank; and a centrifugal pump and a metering pump are arranged at the bottom of the mother liquor tank. According to the method, the problems of a ternary precursor synthesis reaction at present that concentrated particles are subjected to refluxing growth and the product is lost are solved. According to the method for material concentrating in the ternary precursor synthesis reaction, provided by the invention, reaction mother liquor can be directly drained outside the vessel, the problem of loss of the material particles is avoided, the particles are not required to be subjected to refluxing growth after concentration, and the problem that unaccepted products are produced due to secondary growth is avoided.

The invention discloses a resin paint slag-containing PVC (Polyvinyl Chloride) foam composite material and a preparation method thereof, and belongs to the technical field of preparation of PVC foam composite materials and reutilization of resin paint slag. A hard cross-linked PVC foam composite material with the density of 40 to 200 kg/m<3>, the compressive strength of 0.5 to 5.0 MPa and the shearing strength of 0.4 to 3.5 MPa is prepared by mixing recycled resin paint slag serving as a modifying agent, PVC, isocyanate, epoxy resin, a foaming agent and inorganic filler by adopting a mould pressing and water boiling secondary foaming process; the hard cross-linked PVC foam composite material can serve as a core material of a composite material of a sandwich structure, and can be widely applied to the fields, such as buildings, recreational equipment and traffic transportation. According to the resin paint slag-containing PVC foam composite material and the preparation method thereof, the problems of secondary environment pollution caused by the resin paint slag and high treatment cost of a factory are effectively solved; compared with the conventional PVC foam material, the resin paint slag-containing PVC foam composite material has the advantages of low cost, high comprehensive performance and the like.

The invention belongs to the technical field of nanocomposites and discloses a magnetic carbon nano-microsphere taking lignin as a carbon source and a preparation method of the magnetic carbon nano-microsphere. The preparation method includes: dissolving the lignin and ferric acetylacetonate in N,N-dimethylformamide to obtain an electrostatic lignin spray solution containing the ferric acetylacetonate, and then obtaining the lignin nano-microsphere containinging the ferric acetylacetonate through electrostatic spraying; performing pre-oxidation on the obtained lignin nano-microsphere under the temperature ranging from 250DEG C to 280DEG C prior to carbonization treatment under the temperature of 400DEG C to 900DEG C to obtain the magnetic carbon nano-microsphere taking the lignin as the carbon source. The preparation method has the advantages that raw materials are easy to obtain, energy conservation and environment protection is achieved, the obtained product is good in microstructure and dispersing and magnetic performance, and good application prospect in fields of information, energy sources, detection, biology and the like is achieved.

The invention relates to an ultrasonic vibration cup-shaped grinding wheel dresser for dressing a super-hard abrasive grinding wheel. The grinding wheel dresser comprises an ultrasonic generator and a base, wherein a variable-frequency motor and a cylinder body are arranged on the base, the central line of the cylinder body is arranged in a vertical direction, and a cover plate is connected to the upper end of the cylinder body through a flange; a hollow shaft with an open upper-end and a plugged lower-end is coaxially arranged in the cylinder body, a bearing is arranged between the inner wall of the cylinder body and the outer wall of the hollow shaft, and the variable-frequency motor is in transmission connection with the lower end of the hollow shaft; an ultrasonic transducer and an amplitude-change pole are arranged in the hollow haft, the outside of the amplitude-change pole is fixedly arranged on the hollow shaft through a detachable connection structure, and the upper end of the amplitude-change pole is upward and penetrates the cover plate, and a top-opened cup-shaped grinding wheel is fixedly coaxially arranged at the upper end of the amplitude-change pole. The grinding wheel dresser provides ultrasonic vibration in the axial direction, therefore, the microstructure of the dressed grinding wheel can be well improved, dressing of abrasive particles is completed while shaping is completed, grinding heat and power consumption are beneficially reduced, blockage to the grinding wheel and dressing burns are avoided, and the service life of the external circular grinding wheel is prolonged.

The invention discloses a method for preparing an anti-freezing abrasion-resistant baking-free brick by hematite tailings-slag-phosphate tailing sand. The method includes the steps: drying steel slagand slag in a baking oven, placing mixture into a ball grinder to grind the mixture into ultra-fine powder, placing steel slag powder, slag powder, limestone powder and phosphogypsum into a cement mortar stirrer to dryly stir mixture, adding water to wetly stir mixture, and adding phosphate tailing sand to stir mixture to prepare a slag-phosphate tailing sand mixed material; adding hematite tailings, aggregate and cementing materials into the cement mortar stirrer to dryly stir mixture, adding additives, water, pretreated glass fibers, modified steel fibers and the slag-phosphate tailing sandmixed material to wetly stir mixture, adding the stirred material into a stainless steel die, setting forming pressure on a microprocessor control electric-liquid pressure tester, performing pressingformation, setting steam-cure temperature and wet and heat curing, and naturally curing to prepare the baking-free brick. The baking-free brick has excellent permeability resistance, freezing resistance, abrasion resistance, softening resistance and alkali resistance.

The invention provides a preparation method of a double-layer oxide modified carbon fiber reinforced composite material, wherein the surface of carbon fiber filaments is coated with a SiO2-blended Al2O3 coating sizing agent, so that a layer of oxide thin film is formed on the surface; finally an epoxy resin substrate is introduced by means of a RTM process to infiltrate the epoxy resin onto the surface of the carbon fiber cloth, then the epoxy resin is solidified and shaped to manufacture the carbon fiber reinforced epoxy resin based composite material, of which shear performance is improved by 16% and anti-impact performance is improved by 27%.

The invention discloses a method for etching a micron silicon through hole; the method comprises the following steps: (1) taking a silicon wafer, cleaning and drying by blowing; (2) coating photoresist at the two sides of the silicon wafer, carrying out photoetching after drying and developing; (3) depositing multiple layers of precious metal at the two sides of the photoetched silicon wafer; (4) placing the silicon wafer deposited with the precious metal into corrosion solution and reacting to form the through hole; and (5) cleaning and drying by blowing. According to the method disclosed by the invention, a double-side lithography is adopted and the etching process is also carried out at the two sides, so when the two sides are etched to together, the silicon through hole is formed; the etching speed is fast, no further treatment is needed after etching and the microstructure is good; and the micron silicon through hole can be produced in large scale.

The invention provides a composite permanent-magnetic material of a motor and a preparation method of the composite permanent-magnetic material. The composite permanent-magnetic material of the motor is formed by a system of Eu, Gd, Fe, Al, P and M, wherein the M is formed by mixing nanoparticles of Fe2O3, Fe3O4, TiC and SiN; the mass ratio of Eu to Gd to Fe to Al to P to M in the system is (5-7) to (5-7) to (60-70) to (2-3) to (1-2) to (5-7); and the mass ratio of the Fe2O3 to the Fe3O4 to the TiC to the SiN in the M is 10 to 5 to 2 to 1. Therefore, the residual magnetism and the magnetic energy product are kept while the coercive force and the high-temperature stability of the permanent-magnetic material are improved, and the cost is effectively reduced.

The invention provides a preparation method of light heat-insulating mullite nanofiber aerogel with ultra-low solid content. The preparation method comprises the following steps: dispersing a nano mullite fiber membrane to obtain mullite single fibers; mixing silica sol and acrylamide system gel injection molding premix with the dispersed mullite single fibers to prepare gel; and freeze-drying thegel to obtain an aerogel blank, and finally calcining at high temperature to obtain the mullite nanofiber aerogel product. The product is light in weight, high in porosity and low in thermal conductivity, and the preparation method of the nanofiber aerogel which can be used at the temperature of 1300 DEG C is provided.