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192results about How to "Reduce porosity" patented technology

Magnetic powder core material with stable magnetic permeability and low loss and preparation method thereof

The invention relates to a magnetic powder core material with stable magnetic permeability and low loss and a preparation method thereof. First modifying the surface of the iron powder; preparing iron/ferrite composite powder with core-shell structure by high-energy ball milling; mixing the composite powder with the modified powder and then filling the mixture into an alloy steel mold for normal temperature pressing to obtain iron/ferrite soft magnetic composite magnetic powder cores; then performing subsequent heating treatment on the magnetic powder cores. Compared with the prior art, the present invention utilizes a ball milling method to prepare iron/ferrite coated powder. The process is short in time, uniform in coating, and simple in operation. At the same time, the present inventionuses a ferrimagnetic ferrite as an insulating coating agent, which reduces the magnetic dilution phenomenon caused by a non-magnetic substance as a coating agent. The suitable heat treatment temperature avoids the reaction between iron and ferrite during heat treatment to form magnetic disadvantageous components, ensures high saturation magnetization of magnetic powder core, high magnetic permeability, reduces loss, and obtains magnetic permeability of soft magnetic composite magnetic powder core.
Owner:TONGJI UNIV

Tape-casting temperature isostatic pressing composite molding preparation method of metal soft magnetic composite material

The invention discloses a tapecasting temperature isostatic pressing composite molding preparation method of a metal soft magnetic composite material. The method comprises the following steps: (1) mixing a passivator and a solvent to obtain a passivating solution, and mixing, stirring and drying the passivating solution and magnetic metal powder to obtain passivated powder; (2) mixing the passivated powder, an organic solvent, a dispersing agent, an adhesive and a plasticizer according to a certain proportion, uniformly stirring, and filtering and de-foaming the mixture through a sieve to prepare slurry which is uniformly dispersed; (3) performing tape casting; (4) performing temperature isostatic pressing on a biscuit. According to the invention, solidification and isostatic pressing processes are simplified into a process, so that a metal soft magnetic composite film prepared by using the blade casting temperature isostatic composite molding method is high in resistivity and good in mechanical strength, and the density and the saturation flux density are greatly improved. By virtue of a more mature tape casting process and a temperature isostatic pressing process, the production process of the metal soft magnetic composite material is simplified, the cost is reduced, the performance is excellent, and the method has a wide application prospect in preparation of electronic devices such as film inductors.
Owner:ZHEJIANG UNIV

Degradable nerve conduit with highly-oriented tube-in-tube structure and manufacturing method thereof

InactiveCN102048595AReduce porositySmall sizeTubular organ implantsElectrospinningInjector
The invention relates to a degradable nerve conduit with a highly-oriented tube-in-tube structure and a manufacturing method thereof. The degradable nerve conduit comprises an outer-layer tubular substrate and an inner small tube. The manufacturing method comprises the following steps of: (1) dissolving a degradable material into chloroform, adding a porogenic agent, uniformly stirring the solution, casting the solution into a mould, performing vacuum drying after the chloroform is volatilized, removing the mould and repeatedly flushing the casting with deionized water to obtain the outer-layer tubular substrate with a high void fraction after the porogenic agent is washed off; (2) dissolving the degradable material into an organic solvent to prepare spinning dope, injecting the spinning dope into an injector, performing electrostatic spinning under the action of a boost pump, and curling a fibrous membrane on the mould to form the small tube with a tubular structure; and (3) placing and fixing the small tube into a preserved tube arrangement cavity of the outer-layer tubular substrate, and performing sterilization to obtain the nerve conduit with the highly-oriented tube-in-tube structure. The product provided by the invention has high biocompatibility, low production cost and vast application prospect, and can be applied to the repair of a peripheral nervous system; and the preparation method is simple.
Owner:DONGHUA UNIV

Method of coating solid electrolyte with electrode material, coating material, and electrode prepared using coating method

The present invention provides a method for coating an electrode material with a solid electrolyte, an obtained coating material, an electrode prepared by using the coating material, and an all-solid-state battery obtained by using the electrode. The solid electrolyte material mainly aims at halide electrolyte, and comprises LiaMXb, M is one or more of Al, Ga, In, Sc, Y, La, Ho, Sc and the like, Xis one or more of F, Cl and Br, a is more than or equal to 0 and less than or equal to 10, b is more than or equal to 1 and less than or equal to 13, and the X is represented as Li3InCl6, Li3YCl6, Li3YBr6, Li3HoCl6, Li3ScCl6 and the like, and can also be a mixture for coating a solid electrolyte and a conductive agent. According to the invention, the contact between the electrolyte and the electrode material can be significantly improved, the porosity of the pole piece is reduced, the ionic conductivity of the solid electrolyte is not changed after an alkane solvent treatment process, an all-solid-state battery assembled by the electrode material containing the coating layer is simple in process, and the battery can exert high capacity and good rate capability and has a commercial prospect.
Owner:CHINA AUTOMOTIVE BATTERY RES INST CO LTD

Multifactor quantitative evaluation method for 3D porosity in geological period

InactiveCN106597548AReduce porosityOvercoming the Pore Evolution DifficultySeismic signal processingPermeability/surface area analysisSpacetimeRock fragment
A multifactor quantitative evaluation method for the 3D porosity in a geological period belongs to the technical field of diagenetic value simulation in a low-penetration compact reservoir. A planer grid well is selected, and well logging, logging, seismic and analysis and test data is collected and arranged; a 3D burial history and a thermal history under constraints of a sequence stratigraphic framework and deposition microfacies are established, 3D porosity evolution history models of mudstones, arkoses, quartz sandstones and rock-fragment sandstones are established on the basis of a target position, and porosity evolution histories of the different rock types in the target position are evaluated; on the basis of contribution of cementation and corrosion effects of the target position in a research region to the total porosity, porosity effect is corrected by decrease and increase, and a 3D porosity evolution process is evaluated; and a practically measured porosity of the grid well and the simulated porosity of a corresponding well point are analyzed by comparison, the precision requirement is met when the matching degree reaches 75%, and space-time distribution of the 3D porosity of the low-penetration compact reservoir in the geological period is evaluated.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Surface treatment and coating technology for magnesium alloy surface to resist neutral salt spray test

The invention discloses a surface treatment and coating technology for a magnesium alloy surface to resist a neutral salt spray test. The technology comprises the steps of micro-arc oxidation, electrophoresis, spraying of acrylic primer and spraying of organosilicon ceramic composite finish paint, wherein the materials of the organosilicon ceramic composite finish paint include organosilicon coating and nano ceramic coating. In the invention, the magnesium alloy surface is subjected to the surface treatment and coating technology resisting the neutral salt spray test; after the micro-arc oxidation treatment, the electrochemical impedance of the magnesium alloy surface is remarkably improved; and meanwhile, the magnesium alloy micro-arc oxidation protection layer contains a high-temperature change phase, and the film layer has high hardness and toughness and good wear resistance. After the electrophoresis, the film has uniform thickness, strong cohesion and high corrosion resistance and is compatible with multiple finish paints. Particularly, the acrylic resin with strong adhesion, low pollution and low cost can be densely attached to the electrophoretic paint so as to further improve the impact resistance; and after the organosilicon ceramic composite finish paint is sprayed to the surface of the acrylic primer, the magnesium alloy obtains the characteristics of heat and cold resistance, wear resistance, high hardness and the like.
Owner:DONGGUAN EONTEC CO LTD

Method for treating methylene blue dye wastewater

The invention relates to a method for treating methylene blue dye wastewater. Firstly, diatomite is evenly mixed with calcium raw materials, alkali activator and water, and is put in a high-pressure hydrothermal reaction kettle after the compression molding to react for 1-48 hours at the temperature of 100-200 DEG C to obtain a diatomite-based porous adsorbent containing C-S-H, tobermorite and analcite; then, the diatomite-based porous adsorbent is put in a conical bottle accommodated with a liquid culture medium; 5-20% of yeast powder by mass is added to regulate the pH to be 5-8 and to cultivate for 2-48 h under the constant-temperature condition of 15-35 DEG C on a reciprocal shaking table with the speed of 60-120 rpm so as to obtain a yeast-loaded diatomite-based porous adsorbent; finally, 1-10 g of the yeast-loaded porous adsorbent is added in the methylene blue dye wastewater with per liter concentration of 100-1000 mg/L to treat for 1-48 h at the temperature of 25-45 DEG C on the reciprocal shaking table with the pH of 4 to 10 and the speed of 60-120 rpm; the concentration of the treated methylene blue wastewater is measured through a spectrophotometer method; the result shows that the removal rate of the methylene blue dye exceeds 90%. The method has the advantages of simple process, low cost and no secondary pollution, and is suitable for the industrial treatment of the methylene blue dye wastewater.
Owner:TONGJI UNIV

Boiler barrel welding method

The invention relates to a method used for welding a boiler barrel, in particular to a boiler barrel welding method in order to solve the problem that due to the fact that in existing boiler barrel welding, X-ray flaw detection is adopted after welding, the back repair rate is high. According to the first scheme, the boiler barrel welding method comprises the steps that 1 the plate thickness of a first welded barrel section is 26 mm-28 mm and grooves are formed in the inner side of a butt-joint opening position and the outer side of the butt-joint opening position respectively; 2 butt joint positions are aligned tightly; 3 spot welding is conducted on the outer side; 4 full-length butt welding is conducted on the inner side; 5 back gouging is conducted on the outer side by the adoption of a carbon arc gouging welding machine; 6 full-length welding is conducted on the outer side, and weld seams are removed through grinding after welding is completed. According to the second scheme; 1 the plate thickness of a second welded barrel section is 16 mm-24 mm, and a groove is formed on the inner side; 2 butt joint positions are aligned tightly; 3 spot welding is conducted on the outer side; 4 full-length welding is conducted on a butt-joint opening of the inner side through automatic submerged arc welding. According to the third scheme; 1 the plate thickness of a third welded barrel section is 8 mm-14 mm, and the position of a butt-joint opening is ground to be neat; 2 butt joint positions are aligned tightly; 3 a coal firing weld bead is welded; 4 full-length welding is conducted on the inner side; 5 back gouging is conducted on weld seams by the adoption of the carbon arc gouging welding machine on the outer side.
Owner:哈尔滨红光锅炉总厂有限责任公司

Method for selecting particle size distribution ranges and filling amount ratio of heat-conducting silica gel thermal interface material powder filler

The invention discloses a method for selecting particle size distribution ranges and the filling amount ratio of heat-conducting silica gel thermal interface material powder filler. The method comprises the following steps of 1, selecting several types of heat-conducting powder filler different in particle size distribution range; 2, selecting the particle size distribution ranges and the filling amount ratio of the heat-conducting powder filler different in particle size distribution range; 3, adding the heat-conducting filler different in particle size distribution range into a silicone rubber base body in sequence from large particle size to small particle size according to the determined filling amount ratio, and conducting uniform mixing by mechanical manners such as stirring or smelting or banburying, so that a heat-conducting powder filler and silicone rubber mixture is obtained; and 4, further improving density of the silicone rubber mixture through a physical vibration method. The method for theoretically researching the filling amount ratio of the heat-conducting powder filler different in particle size distribution range is mainly provided. By means of the research method, a silicone rubber thermal interface material which is high in powder filler stacking density, high in heat conductivity coefficient and stable in performance can be prepared. The method has great theoretical instruction significance for selection of types and particle sizes of the powder filler and optimization of the filling amount of the heat-conducting powder filler different in particle size distribution range.
Owner:SHANGHAI UNIV

Precursor carbonization plasma cladding reaction synthesized WC reinforced metal based alloy coating and preparation

The invention relates to a precursor carbonization plasma cladding reaction synthesized WC reinforced metal based alloy coating, which is characterized in that preparation of the coating combines precursor carbonization compounding, plasma cladding and reaction synthesis technologies. Specifically, the involved mixed powder comprises the following elements by mass: 10-30% of W, 0.5-2% of C, 9-12% of Cr, 1-1.5% of B, 0.8-1.1% of Si, 0.5- 0.8% of Mo, and the balance Fe, wherein the C is obtained by carbonization of a sucrose precursor at a low temperature and wraps the surface of the W powder. The coating has thickness of 2-5mm, the width of a single-channel cladding layer is 3-12mm, and the porosity is low. The coating is mainly based on an iron-based solid solution, WC, (Fe, Cr, W)7C3, (Fe, Cr, W)23C6, and Fe3W3C-Fe4W2C and other phases, the coating section hardness is 900-1650HV0.1, and the surface hardness is 60-70HRC. According to the invention, the problems of interfacial contamination, generation of a brittle phase and the like in the coating are improved, and also the production of the WC reinforced phase in the coating is substantially improved. The coating has excellent wear resistance and excellent corrosion resistance.
Owner:HOHAI UNIV +1
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