37results about How to "Controllable ingredients" patented technology

The invention relates to a method for preparing a ceramic-based composite material environment barrier coating by laser cladding, which has the technical characteristics that: 1, a composite material to be coated is processed to a required size and completely washed in an ultrasonic washing machine; 2, the environment barrier coating material powder, a bonding agent and a solvent are mixed uniformly according to a certain ratio to form pulp; 3, the pulp is uniformly brushed on the surface of the composite material and dried; and 4, the membrane coated with the coating pulp is placed on a laser processing worktable, laser cladding is performed by a certain process, and thus, the environment barrier coating is prepared. The interface of the obtained coating is firmly bonded, the coating is uniform and compact, and the quality of the coating is improved obviously. In the invention, the process is simple, area-selectable cladding can be performed, the processing period is short, and high-performance environment barrier coating can be prepared.

The invention relates to a preparation method and application of a carbon/ceramic composite material, in particular to a preparation method and application of a carbon/ceramic composite material needed for braking a high-momentum delivery system. The preparation method includes: using a C/C composite material of 1.2-1.5 g/cm3 in density as a raw material; disposing the raw material in impregnation liquid I for impregnation, pyrolyzing in a protective atmosphere after impregnation, repeating impregnating-pyrolyzing operations until a carbon/ceramic composite material of 1.85-1.9 g/cm3 in density is obtained; treating the carbon/ceramic composite material obtained at high temperature until density of the carbon/ceramic composite material is lowered to 1.82-1.88 g/cm3 to obtain a pre-finished product; disposing the pre-finished product in impregnation liquid II, decomposing in a protective atmosphere after impregnation is completed, polishing after decomposing, and repeating impregnating-decomposing-polishing operations until a carbon/ceramic composite material finished product of 1.93-2.0 g/cm3 is obtained.

The invention relates to preparation methods of a multi-element metal chalcogen compound, a target and a coating material. The preparation method of the multi-element metal chalcogen compound comprises the following steps of: synthesizing an elementary substance powder selected from forming elements at normal pressure with a liquid phase synthesis method, wherein the used organic solvent in the synthesis process is an aromatic amines compound with a boiling point higher than 240 DEG C and pH value of 7-10, and thereby producing a copper-indium-gallium-selenium element compound through chelation reactions at high temperature. The compound can be particularly applied to the solar energy field of semiconductor films, can be directly coated into a film and sputtered to a film through producing a target, the selenylation process is unneeded, the production procedure can be reduced, the consistency of the film components is improved, and the product yield and the efficiency are enhanced.

The invention provides a preparation method of a magnesium-lithium alloy surface coating. Using ceramic precursor polymers such as polysilazane, polycarbosilane and polysiloxane as the base material, with fillers such as B4C powder, SiC powder, SiO2 powder, Al2O3 powder and a small amount of additives, the preparation is carried out as follows: 1. Add a certain amount of fillers and additives to the precursor solution, and mix it in a ball mill to form a uniform slurry; 2. Apply the slurry to the surface of the treated magnesium-lithium alloy by brushing or spraying; 3. Put the Put the painted sample into a nitrogen or vacuum furnace, and cure it at 150°C to 200°C for 0.5 to 2 hours; 4. Brush (or spray) and cure the sample to obtain a reinforced coating . The present invention forms a high polymer with a three-dimensional network through the cross-linking reaction of the precursor molecules, and forms a dense coating on the surface of the magnesium-lithium alloy through the addition of fillers. The coating has excellent corrosion resistance and corrosion resistance. Grinding and heat resistance and other properties. The invention is an ideal method for preparing the magnesium-lithium alloy coating with low cost and high benefit, and broadens the application of the magnesium-lithium alloy in the fields of aerospace, automobile, electronics and the like.

The invention provides a composite coating having antibacterial performance and biocompatibility. The composite coating includes an antibacterial coating and a biocompatibility coating, wherein the antibacterial coating is 2-1000nm thick; and the biocompatibility coating is 2-500nm thick. With the application of a mode of combining the antibacterial coating and the biocompatibility coating, the service life of the coating (the composite coating) is prolonged; the composite coating, which is simple in process, can be continuously and rapidly prepared by a large area; a better antibacterial effect can be achieved, so that antibacterial elements can be released at moderate speed; the biocompatibility coating, under the conditions, can avoid influence to release of antibacterial elements and development of antibacterial performance; and therefore, the composite coating is an ideal coating of implantable medical apparatuses.

The invention relates to a method for low temperature aqueous solution electrochemical codeposition of nickel iridium alloy, and the method is characterized in that: nickel salts comprise 0.001-0.1mol / L of nickel sulfate, 0.035-0.05mol / L of nickel chloride and 0.005-0.5mol / L of nickel sulfamate, iridium salt is 0.005-0.1mol / L of trichloride iridium containing water crystal, the complex is 0.1-0.5mol / L of citric acid, additives comprise 0.001-0.01mol / L of saccharin, 0.0005-0.01mol / L of gelatin, 0.0001-0.005mol / L of lauryl sodium sulfate, 0.0001-0.005mol / L of naphthyldisulfnate, 0.0001-0.005mol / L of coumarin and 0.0001-0.005mol / L of paratoluene sulfonamide, and the nickel salts, the iridium salt, the complex and the additives are dissolved in deionized water; the plating solution pH is 2-12, deposition temperature is 25-90 DEG C, the current density is 20-100mA / cm<2>, agitation and nitrogen protection are needed in the deposition process, stirring speed of a stirrer is 10-1000 rpm, electrochemical codeposition of nickel iridium alloy can be performed on the surface of an electrode of a pretreated workpiece, and nickel iridium alloy having the advantages of homogeneous composition, fine crystalline grains, good bonding and excellent corrosion resistance can be obtained, the iridium content is 0.1-50at%, and the alloy thickness is 0.1 to 100 mu m.

The process of preparing nanometer composite ceramic coating in super-gravitational field includes: pouring solution for making composite ceramic coating into centrifuger, increasing the rotation speed of the centrifuging tank gradually to 1000-2000 rpm, maintaining the rotation speed for 1-100 min, raising the heating temperature gradually to 200-1000 deg.c under stable rotation speed, maintaining the temperature for 10-600 min, and cooling to room temperature. The super-gravitational field generated in the centrifuger applies one force perpendicular to the substrate surface to the colloid particle, chemical precipitate, ceramic powder, ceramic fiber, metal powder and metal fiber inside the solution to extrude them to the surface of the substrate; and the gradually raised temperature makes the solvent volatilize and the precipitate pyrolyze, oxidize, sinter, etc., so as to form controllable compact nanometer composite ceramic coating.

The invention relates to a method for preparing superhigh temperature carbonized hafnium ceramic nano-powder. Anhydrous saccharose is evenly dispersed in deionized water, a mixed template is added, stirring is carried out, an even and transparent precursor solution is obtained, and the solution is poured into a hydrothermal still; the hydrothermal still is placed in an electric heating air blowing drying box for reacting after being sealed, then the product is cooled to room temperature, and filtering, separation, washing and drying are carried out; finally, the product is mixed with hafnium powder, a vacuum carburizing reaction is carried out, and HfC nano particles are prepared. Compared with the prior art, the prepared carbonized hafnium ceramic nano-powder is good in crystallinity and dispersity and controllable in morphology.

The invention relates to a method for preparing a tritium resistance Er2O3 coating by using a chemical solution method. The method comprises: mixing ethanol and terpineol according to a volume ratio of 20:1-10:1; stirring the resulting mixed solution with a magnetic stirrer at a room temperature; adding erbium nitrate to the mixed solution in a dropwise manner after the mixed solution is uniformly stirred; stirring for 4-8 hours with the magnetic stirrer at a temperature of 80-90 DEG C to obtain a transparent light red erbium nitrate gel; coating the erbium nitrate gel on a substrate; placing the substrate coated with the erbium nitrate gel in a high temperature tube quartz furnace, and carrying out high temperature sintering for 3-5 hours under inert atmosphere at a temperature of 600-800 DEG C to obtain the tritium resistance Er2O3 coating. The tritium resistance Er2O3 coating of the present invention is flat and compact, and has good adhesion with the substrate.

The invention discloses a high-purity bismuth-lead alloy and a preparation method thereof. The preparation method comprises the steps that a compounding step is carried out, specifically, according tothe composition design of the bismuth-lead alloy, massive lead materials and bismuth materials are used as raw materials for compounding and mixing; a smelting step is carried out, specifically, themixed raw materials are smelted under vacuum; a cooling step is carried out, specifically, alloy melt obtained after smelting is subjected to cooling; a filtering step is carried out, specifically, the alloy melt after cooling is subjected to filtration treatment; and a casting step is carried out, specifically, the filtered alloy molt is casted into a mold under vacuum and cooled to obtain an alloy ingot. According to the high-purity bismuth-lead alloy and the preparation method thereof, through the combination of high-temperature vacuum melting and low-temperature vacuum casting, oxides andother metal impurities in the lead and bismuth raw materials can be efficiently and advantageously removed, so that the purity of the alloy reaches above 99.998%. And through timing electromagnetic stirring and controlling of the weight of a single alloy ingot, the overall composition of the alloy is uniform and controllable, and the problem of excessive composition segregation is avoided.

The invention discloses a preparation method of humic acid coated urea. The preparation method comprises following steps: humic acid raw powder and trisodium phosphate are added into a sodium hydroxide or a potassium hydroxide aqueous solution for 1h of reaction at 100 DEG C so as to obtain a sodium humate or a potassium humate aqueous solution; polyvinyl alcohol is added for mixing, and an obtained mixed solution is dried until water content is lower than 10% so as to obtain a dry product; the dry product is smashed into particles with a particle size of 80 to 200 meshes, and is taken as a coating agent; at normal temperature, the coating agent is mixed with urea particles at a certain ratio; an obtained mixture is subjected to treatment in a roller for 10 to 30min, and is subjected to sieving and packaging so as to obtain humic acid coated urea. The preparation method is capable of realizing direct coating after pelleting in urea plants, and is suitable for coating processing in value-adding factories using commercial urea. Introduction of humic acid is capable of improving product functions, urea is provided with long-term stability, utilization ratio is increased greatly, the preparation method is beneficial for energy saving and environmental protection; long-term application is capable of restoring soil, increasing soil organic matter content, and improving soil self adjustment ability, and is beneficial for agricultural sustainable development.

The preparation method of the novel hollow sphere filled polyurethane-based composite material comprises the following steps: cleaning the surface of a hollow sphere to remove impurities and dirt on the surface, and drying for later use; wherein the used surface modifier is a silane coupling agent, and the silane coupling agent needs to be hydrolyzed; adding the hollow spheres into the hydrolyzedsilane coupling agent solution, stirring at a proper temperature, then putting the hollow spheres into a drying oven for drying, and taking out for later use; and adding the modified hollow spheres into a casting mold, sequentially adding isocyanate, hydroxyl-terminated polyester or hydroxyl-terminated polyether and other assistants, stirring to uniformly distribute the hollow spheres in the matrix, curing at room temperature, and demolding to obtain the hollow sphere filled polyurethane-based composite material. The production process is reasonable in design, and operation steps are simple and convenient; the components and the structural design of the composite material are controllable; the composite material has excellent mechanical and acoustic properties.

The invention relates to a laser repairing method for a propeller shaft. According to the method, the propeller shaft is repaired through laser cladding, specifically, heating is conducted on a metal surface by means of a high-energy laser beam, a substrate surface and added alloy powder are quickly heated and melted under the heat action to form a metallurgical bonding surface cladding layer with an extremely low dilution rate, the propeller shaft is repaired by means of a laser cladding technology, more excellent abrasion resistance and corrosion resistance are achieved, deformation of the propeller shaft can be avoided due to quick heating and quick cooling of laser, low heat input, a small heat affected zone and low distortion, the dilution rate of the cladding layer is smaller than 5%, the cladding layer is in firm metallurgical bonding with a substrate, and the good cladding layer with controllable cladding layer components and dilution can be obtained.

The invention discloses a modification treatment method for surface of a space material reflector blank. The modification treatment method comprises the steps that S1, the reflector blank is pretreated, specifically, a zinc dipping solution is used for treating the modified surface of the space material reflector blank, and a transition layer is generated on the modified surface of the space material reflector blank; and S2, modification treatment is conducted, specifically, the pretreated space material reflector blank is treated through a modification treatment solution, and a nickel-phosphorus alloy modified layer is deposited on the modified surface of the space material reflector blank. By means of the modification treatment method for the surface of the space material reflector blank, the nickel-phosphorus alloy modified layer with the microhardness being HV 400-780, the melting point being not lower than 890 DEG C, the thermal expansion coefficient being (7.8-9.4) * 10<-6>/DEG Cand the porosity being lower than 5% can be deposited on the surface of the reflector blank through a chemical deposition method, the surface defect grade of the nickel-phosphorus alloy modified layer is IV, the modification treatment method is suitable for optical ultra-precision machining, and an ultra-smooth surface with the root mean square value being 0.049 lambda, the roughness being superior to 2nm and the surface defect grade being IV can be obtained through optical precision polishing.

A preparation method of a SnO2/Fe3O4 composite nano-catalyst relates to the technical field of composite nano-catalysts, and comprises two processes of precursor room temperature preparation and hydrothermal reaction, firstly, at room temperature, ferric oxide hydrate (FeOOH) powder is added into a stannous chloride (SnCl2) aqueous solution, after ultrasonic dispersion, a proper amount of NaOH is added, and after stirring and mixing, a reaction precursor is obtained; and then, transferring the precursor into a reaction kettle, and carrying out hydrothermal reaction to obtain the SnO2/Fe3O4 composite nano catalyst. According to the preparation method, stannous chloride (SnCl2) is taken as a reducing agent, common ferric oxide hydrate (FeOOH) is taken as an iron source, the SnO2/Fe3O4 nano composite material is successfully prepared through a hydrothermal reaction, and the composite material has good magnetic performance and visible light absorption characteristics and is expected to be used in the fields of magnetic optical device manufacturing or sewage treatment catalysts and the like.