36results about How to "Effective control of thickness" patented technology

The invention discloses a method for preparing high-inoxidability sphere-like copper powder, which comprises the steps of reduction reaction, washing, surface chemical treatment and drying treatment, wherein the reduction reaction is to dissolve a reducing agent and a copperish initiator material into solvent and perform the reduction reaction under the action of an auxiliary agent, the reaction temperature is between 40 and 100 DEG C, and the reduction reaction time is between 2 and 5 hours. The reducing agent is vitamin C (C6H806, Vc,). The copperish initiator material is a substance which can be ionized into Cu2+ in aqueous solution and comprises one or several of hydrated copper sulfate, hydrated copper nitrate and hydrated copper chloride; the solvent is deionized water; and the auxiliary agent comprises an inorganic salt or an alkaline substance for adjusting the pH value and a water soluble polymer material for a surfactant. The obtained copper powder has the advantages of good dispersity, no agglomeration, small specific area, high tap density, controllable granule size, narrow grain size distribution range, and strong antioxygenic property.

The invention relates to a composite positive electrode material for preparing a metal lithium primary battery with high discharge voltage and high specific capacity. The oxide coating technology is adopted to maintain the high discharge specific capacity of the fluorocarbon material while increasing the discharge voltage of the fluorocarbon material. Then the metal oxide / fluorocarbon composite positive electrode material with high specific energy is obtained.

The invention relates to a silicon carbide coating and a preparation method thereof, and belongs to the technical field of inorganic functional coating materials. The preparation method of silicon carbide comprises the following steps: respectively preparing a first coating sizing agent and a second coating sizing agent, wherein the first coating sizing agent is prepared from phenolic resin, Si powder and SiC powder with a weight ratio of 3:(3 to 5):(0.5 to 1.5), and the second coating sizing agent is a silicified sizing agent; coating the surface of a carbon-containing material with the prepared first coating sizing agent, curing to obtain an inner coating layer, then coating the surface of the inner coating layer with the prepared silicified coating sizing agent, and curing to obtain an outer coating layer; performing high temperature vacuum sintering on the carbon-containing material on which the outer coating layer is formed, thus obtaining the silicon carbide coating. According to the silicon carbide coating provided by the embodiment of the invention, the inner coating layer and the outer coating layer can be formed by high temperature sintering for once, quick formation of the high-quality silicon carbide coating is realized, the preparation process is greatly simplified, and a preparation period is shortened by 50 percent or more; the method adapts to quick preparation of carbon-containing materials with different structures, different sizes and special shape and component coatings thereof.

The invention relates to a silicon carbide coating and a preparation method thereof, and belongs to the technical field of inorganic functional coating materials. The preparation method of silicon carbide comprises the following steps: respectively preparing a first coating sizing agent and a second coating sizing agent, wherein the first coating sizing agent is prepared from phenolic resin, Si powder and SiC powder with a weight ratio of 3:(3 to 5):(0.5 to 1.5), and the second coating sizing agent is a silicified sizing agent; coating the surface of a carbon-containing material with the prepared first coating sizing agent, curing to obtain an inner coating layer, then coating the surface of the inner coating layer with the prepared silicified coating sizing agent, and curing to obtain an outer coating layer; performing high temperature vacuum sintering on the carbon-containing material on which the outer coating layer is formed, thus obtaining the silicon carbide coating. According to the silicon carbide coating provided by the embodiment of the invention, the inner coating layer and the outer coating layer can be formed by high temperature sintering for once, quick formation of the high-quality silicon carbide coating is realized, the preparation process is greatly simplified, and a preparation period is shortened by 50 percent or more; the method adapts to quick preparation of carbon-containing materials with different structures, different sizes and special shape and component coatings thereof.

The invention relates to a process method for regulating the thickness of iron-based amorphous alloy strips. The invention can control the iron-based amorphous alloy strip thickness by using the process method of iron-based alloy melt composition and heat treatment temperature without changing the rapid solidification process conditions. The thickness of the crystal alloy strip is reduced, and the difficulty of preparing the iron-based amorphous alloy thick strip is reduced. The invention has the characteristics of low implementation cost, high efficiency, strong controllability and repeatability, high technical reliability, etc., and is suitable for wide application in the technical field of metal functional material preparation.

The invention belongs to the technical field of catalysts, and particularly discloses a superacid-coated HZSM-5 molecular sieve catalyst. The catalyst is prepared through the step that the surface of an HZSM-5 molecular sieve is coated with one of superacids including TiO2.H2SO4, ZrO2.H2SO4, TiO2.H2S2O8 and ZrO2.H2S2O8 or a composition of TiO2.H2SO4, ZrO2.H2SO4, TiO2.H2S2O8 and ZrO2.H2S2O8. The invention further discloses a preparation method of the superacid-coated HZSM-5 molecular sieve catalyst and application of the superacid-coated HZSM-5 molecular sieve catalyst in a technology for preparing low carbon olefin from naphtha through catalytic cracking.

The invention discloses a method for preparing high-inoxidability sphere-like copper powder, which comprises the steps of reduction reaction, washing, surface chemical treatment and drying treatment, wherein the reduction reaction is to dissolve a reducing agent and a copperish initiator material into solvent and perform the reduction reaction under the action of an auxiliary agent, the reaction temperature is between 40 and 100 DEG C, and the reduction reaction time is between 2 and 5 hours. The reducing agent is vitamin C (C6H806, Vc,). The copperish initiator material is a substance which can be ionized into Cu2+ in aqueous solution and comprises one or several of hydrated copper sulfate, hydrated copper nitrate and hydrated copper chloride; the solvent is deionized water; and the auxiliary agent comprises an inorganic salt or an alkaline substance for adjusting the pH value and a water soluble polymer material for a surfactant. The obtained copper powder has the advantages of gooddispersity, no agglomeration, small specific area, high tap density, controllable granule size, narrow grain size distribution range, and strong antioxygenic property.

The invention relates to a Fe3Si / Al2O3 composite powder with core-shell structure and a preparation method thereof. According to the technical scheme, the method includes the steps of mixing Fe3O4 powder and FeSiAl powder according to the mass ratio, being 2-15 to 100, of the Fe3O4 powder to the FeSiAl powder, at 100 rpm to 300 rpm, carrying out ball milling on the mixed powder for 4 hours to 12 hours to obtain FeSiAl / Fe3O4 core-shell particles, putting the FeSiAl / Fe3O4 core-shell particles in a high-temperature tubular furnace, heating to 800 DEG C to 1300 DEG C under a vacuum condition or aprotective atmosphere condition, and carrying out heat treatment for 0.5 hour to 2 hours to obtain the Fe3Si / AL2O3 composite powder with the core-shell structure. The composite powder and the method have the advantages of less raw material loss, environmental friendliness, low preparation cost and simple process, and the prepared Fe3Si / Al2O3 composite powder with the core-shell structure is uniform in insulating layer, high in saturation magnetization intensity and low in coercive force.

The invention relates to the field of biodegradable high polymer materials and specifically relates to a fully biodegradable film with adjustable performances and a preparation method thereof. The preparation raw material of the fully biodegradable film includes polylactic acid and degradable polyester copolymer, wherein the molecular chain of degradable polyester copolymer contains an aliphatic polyester chain segment and an aromatic polyester chain segment.

The invention discloses an iron-silicon based soft magnetic powder core with multiple insulation layers and a preparation method thereof. According to the technical scheme, iron-silicon alloy powder is stirred in a water vapor atmosphere at 100-260 DEG C for 0.5-3 hours to obtain composite powder; the composite powder is subjected to vacuum drying, placed in a mold and subjected to cold press molding at 300-1200 MPa to obtain a green body; the green body is placed in a high-temperature sintering furnace, heated to 800-1300 DEG C under the condition of vacuum or protective atmosphere and sintered for 0.5-5 hours to obtain a sintered green body; the sintered green body is placed in a heat treatment furnace, heated to 500-1200 DEG C under the condition of vacuum or protective atmosphere, subjected to heat treatment for 0.5-5 hours and cooled with the furnace to obtain the iron-silicon soft magnetic powder core with multiple insulation layers. The process is simple, the production cycle isshort, insulating coating layers of the prepared iron-silicon soft magnetic powder core with multiple insulation layers are uniform and thin, the eddy current loss is low, the saturation magnetic induction intensity is high, and the coercive force is low.

The invention relates to a preparation method of a rare earth-containing high-molecular nanocomposite film. The preparation method comprises the following steps of mixing an anionic polyelectrolyte liquid and a rare earth ionic salt liquid with the same volume and stirring for 12-24 hours to obtain a negatively charged high-molecular rare earth composite nanoparticle liquid; at 10-50 DEG C, placing a pretreated substrate into a cationic polyelectrolyte liquid, standing, cleaning and then placing the substrate into the negatively charged high-molecular rare earth composite nanoparticle liquid, standing, cleaning, circulating in such a manner to obtain the rare earth-containing high-molecular nanocomposite film. The preparation method is simple and is easy to operate and the prepared film has excellent optical property and broad application prospects.

The invention discloses an ABA type colloid particle with multiple properties on the surface and a preparation method thereof, belonging to the technical field of submicron-scale material preparation. In the present invention, colloidal particles are used as particle emulsifiers, and the Pickering emulsion liquid water-oil three-dimensional interface is used as a protective interface. The monomers in the emulsion liquid are polymerized and phase separated to the interface, and a protective film is formed at the position of the colloidal particles near the equator. After selective modification Colloidal particles with a clear ABA-type partition on the surface can be obtained after characterization or etching and removal of the protective film. This method is based on emulsion polymerization, which is easy to achieve mass production, and the material has strong universality. The prepared ABA colloidal particles have good application value in optical and electromagnetic functional materials, medical materials, template materials, etc.