34results about How to "In situ synthesis" patented technology

A disclosed method for in-situ synthesizing a silicate/carbon composite cathode material by taking rice husk carbon as a silicon source comprises the following preparation steps: (1) primary smashing of rice husks; (2) purification of the rice husks; (3) pyrolyzing the rice husks under catalysis of metal elements to obtain a SiMO/C mixture; (4) smashing the SiMO/C mixture to D50=1-2 [mu]m by an jet mill; (5) adding a lithium source, ball milling and mixing; and (6) sintering under gas protection to obtain Li2MSiO4/C. According to the method, cheap biological silica is used to prepare the silicate cathode material, resource utilization of agriculture wastes is realized, and high added-value products are produced; at the same time, the rice husk carbon is obtained by the middle-temperature pyrolysis method, the residual carbon of the rice husk carbon is taken as a carbon source, and the synthesis process of the silicate cathode material does not need extra carbon, and the in-situ synthesis of the Li2MSiO4 material is realized synchronously.

The invention relates to a processing device for synthesizing a surface layer of a nano-composite material in situ by performing friction stir processing (FSP) on a metal workpiece through a stirring head capable of synchronously feeding powder, and a method. A clamping part 1, a shaft shoulder 2 and a stirring probe 3 of the stirring head can be a rigid whole body or a fastening coaxial separated body; a powder feeding channel A is arranged in the stirring head; the inlet of the channel A is positioned on the side or middle axial position of the clamping part 1; and the outlet of the channelA is positioned on the surface of the middle axial position of the probe 3, which is contacted with the workpiece. During processing, a hydraulic device in a worktable capable of automatically lifting is used for pressurizing along the axial direction B of the stirring head, a rotating shaft drives the stirring head to rotate at high speed and press the workpiece, an external automatic powder feeder feeds sub-micron reinforcing phase powder into a seriously plasticized area C on the surface layer of the workpiece through the powder feeding channel A of the stirring head, and the nano-composite material is synthesized in situ through friction heat. The device is simple, is convenient to operate, is suitable for the composition and structure refining of various metal substrates, and is highin technical and economic benefit and industrial application potential.

The invention provides a method for disposing gas pollution making use of ferrate. In the method, the polluted gas is directly pumped into ferrate solution to achieve better effects on gas contaminant disposal after absorption and oxidation; the ferrate solution is prepared under the room temperature by adopting a diaphragm-typed electrolyser, taking the mixed solution of NaOH with low concentration and Na2SiO3 as electrolyte and electrolysing iron-based anodes under direct current. The method of the invention is suitable for being applied to the removal and disposal of gas contaminant such as volatile organic gas, sulphur and oxynitride in the flue gas and sulfureted hydrogen, etc. and prevents the secondary pollution at the same time; the prepared ferrate has good stability, easy recurrence and obvious disposal effects on the gas contaminant. The method of the invention has the advantages of simple and continuous technology, low cost, simple and convenient operation and mild conditions.

The invention discloses an original position synthesis method of fullerene Pt catalyst. The method uses the chloroplatinic acid and deionized water to produce chloroplatinic acid solution, places it in containers and then immerses the negative pole and anode under liquid surface to energizing and striking of arc, the electric arc discharges to make the anode evaporate and provide carbon resource for the growth of fullerene structure, while the metal positive ion in brine solution is deacidized to generating Pt metal particles and load is under the surface of fullerene; then stops discharge, collect product after cooling and gains the fullerene Pt catalyst after drying. The innovation of the invention lies on: fullerene is prepared while Pt is loaded on the surface of carbon material, it achieves the original position synthesis of fullerene Pt catalyst; it is tested that the fullerenes Pt catalyst has excellent catalytic activity to carbinol oxidation, and the process is simple and easy to control, the application prospects are charming.

The invention discloses a method for preparing a porous silicon-carbon composite material in situ; the method comprises the following steps that (1) a polymer with positive charges is mixed with a solvent to obtain a mixed solution, wherein the main chain or the side group of the polymer with positive charges has an amino group; and the solvent is a mixed solvent composed of an organic solvent andwater; (2) a silicon source is mixed with the mixed solvent obtained in the step (1), the mixture is subjected to hydrolysis reaction to obtain a suspension, and then the suspension is subjected to post-treatment A to obtain a silicon-carbon precursor; and (3) the silicon-carbon precursor is mixed with magnesium powder, magnesium thermal reduction reaction is carried out to obtain a crude product, and post-treatment B is performed to obtain the porous silicon-carbon composite material. The invention discloses the method for preparing the porous silicon-carbon composite material in situ; the prepared porous silicon-carbon composite material is complete in morphology, the particle sizes of the composite material are relatively small, and the particle sizes of the composite material are about 20-60 nm. By taking the porous silicon-carbon composite material as a negative electrode, the cycling stability of the lithium battery can be remarkably improved.

The invention discloses an in-situ generated mullite whisker reinforced ceramic green body. The ceramic green body comprises the following raw materials: 70-80 wt% of a basic blank, 1-5 wt% of spodumene, 3-8 wt% of bauxite and 10-20 wt% of andalusite, the basic blank is prepared from the following raw materials: 21 to 24 weight percent of chinastone, 18 to 22 weight percent of potassium feldspar, 30 to 34 weight percent of kaolin, 6 to 11 weight percent of black mud, 4 to 7 weight percent of washing mud, 10 to 14 weight percent of white mud and 1 to 3 weight percent of talc. In addition, the invention also discloses a preparation method of the in-situ generated mullite whisker reinforced ceramic body. By optimizing a formula system, formation of a large number of mullite crystals can be promoted, so that the breaking strength of the ceramic green body is effectively improved, the thickness of a product is reduced, and thin-wall light weight of the building sanitary ceramic green body is realized.

The invention discloses a preparation method of a cadmium molybdate modified copper-based composite electric contact material. According to the method, uniform nucleation and growth of CdMoO4 are completed on the surface of copper powder particles through an in-situ synthesis method, so that cadmium molybdate modified copper-based (CdMoO4/Cu) composite electrical contact material with second-phaseuniform dispersion distribution is prepared. According to the method, the problems of pollution problem of Cd vapor in a CdO/Ag contact material and Ag resource shortage are solved, and the purpose of uniform dispersion distribution of the CdMoO4 is achieved; and through the steps of hot extrusion, rolling, stamping and the like, the characteristics of good plasticity of copper alloy are used, sothat the efficient densification of CdMoO4/Cu composite material is realized, the uniform dispersion degree of the CdMoO4 in a copper matrix is further improved, and thereby the microstructure performance and the service performance of an electrical contact are improved.

The invention discloses biomedical material and a preparation method thereof. The preparation method includes: 1, melting and forming; 2, polarizing an anode; 3, depositing the anode; 4, performing thermal treatment; 5, coating. The biomedical material comprises a pure magnesium or magnesium-alloy base and a functional film which covers the surface of the base and which has the functions of degradation protection and self-degradation. The biomedical material features controllability, full degradation and full absorption, and the strict requirements for ideal features of the degradable biomaterial are met. The biomedical material has the advantages that an optimal solution is provided for the absorbable biomedical material, especially the contradiction between biodegradability and degrading speed control in medical magnesium alloy, and related materials and techniques are applicable to common medical instruments and are more competitive in production of high-end medical instruments, such as implant instruments, especially 'secondary-operation-free' implants.

The invention discloses a high-isotactic polypropylene alloy and a preparation method thereof. The high-isotactic polypropylene alloy comprises the following components in percentage by mass: 60-98% of isotactic polypropylene, 1-35% of a polyolefin copolymerization elastomer and 1-5% of atactic polypropylene. The igh-isotactic polypropylene alloy is prepared by the following two steps: I, catalyzing polymerization of propylene slurry or a gas-phase or liquid-phase body by using a Ziegler-Natta catalyst so as to prepare isotactic polypropylene, and II, continuously performing gas-phase copolymerization on butane and higher alkene on polypropylene granules, thereby obtaining the high-isotactic polypropylene alloy.

The invention discloses a nano-silver composite material for drinking water disinfection and a preparation method thereof, belonging to the field of environment function materials. According to the composite material disclosed by the invention, polypropylene fiber is used as a carrier; the composite material is rich in ultra-large pore structures; the porosity factor is 30 to 80%; the apertures are 1 to 20mu m; the inner walls of pores are loaded with nano-silver particles; nano-silver is evenly distributed; the content is 0.1 to 5wt%; and the particle sizes are 5 to 80nm. The preparation method of the nanocomposite material can be summarized as follows: fully mixing polypropylene fiber with a solution containing silver ions and a surface active agent, stirring for a period of time, then taking out and drying the mixture, adding the mixture into a NaBH4 solution, after reacting for a period of time, taking out the mixture, using deionized water to wash away the residual surface active agent, and drying to obtain the composite material. The nanocomposite material disclosed by the invention is simple and easy in preparation, soft and light in texture, easy to carry and able to be used as a filler, and the material is high in disinfection efficiency, stable in nano-silver combination and low in wastage rate, does not generate disinfection by-products, and has obvious advantages compared with existing water body disinfection materials.

The invention relates to a preparation method of a tough wear-resistant silicon nitride based composite ceramic. The preparation method comprises following steps: (1) mixing following components in percentage by weight: 80 to 95% of alpha-Si3N4 powder and 5 to 20% of a C4H6CoO4.4H2O water solution, and stirring the solution by a magnetic force under a heating condition until the solvent is totally evaporated to obtain mixed powder; (2) crushing the mixed powder, sieving the mixed powder by a 100-mesh sieve, filling the mixed powder into a steel die, and pre-pressing the mixed powder to obtain a pre-pressed sample; (3) sintering the pre-pressed sample at a high temperature under a high pressure, and cooling the sample in the furnace to obtain a blank; and (4) polishing the surface of the blank to obtain silicon nitride based composite ceramic. The technology is simple and controllable, the production efficiency is high, the powder does not need any special treatment, and the preparation method is suitable for massive production. The high temperature toughness and wear resistant performance of the prepared finished product are excellent. The service life of ceramic parts in a high temperature environment is largely prolonged.

The invention provides a preparation method of in-situ synthesized perovskite quantum dot coded resin microspheres. Perovskite quantum dot raw materials are introduced through a micro-fluidic device to synthesize perovskite quantum dots, a resin solution and an aqueous solution with a surfactant are introduced into the micro-fluidic device, perovskite is dispersed in the resin solution, the aqueous solution with a surfactant shears the resin solution to form a resin droplet template encapsulating the perovskite quantum dots, and finally, the resin droplet template is cured to obtain the perovskite quantum dot coded resin microspheres. The invention further provides a device capable of realizing the method. The perovskite quantum dot coded microspheres prepared by the method have good uniformity and monodispersity, the size is controllable, and the internal perovskite quantum dot coded emission wavelength in the preparation process is controllable. The method can be realized at normal temperature, the perovskite quantum dots cannot leak to cause unstable coding and heavy metal ion pollution after being packaged by resin, and the repeatability is good.