368results about How to "Low heat treatment temperature" patented technology

The invention discloses a preparation method of high-coercivity sintered Nd-Fe-B. The preparation method comprises the following steps: preparing a main phase alloy powder and a grain boundary phase alloy powder; protecting the prepared main phase alloy powder and the grain boundary phase alloy powder by using nitrogen or argon in a protective medium, and uniformly mixing, wherein the mass percent of the added grain boundary phase alloy powder accounts for 0.1-10 percent; carrying out orientation profiling and cold isostatic pressing on the mixed alloy powder; in a vacuum sintering furnace, sintering a profiled magnet block for 2-4h at the temperature of 1000-1100 DEG C, then carrying out primary tempering for 2-4h at the temperature of 800-950 DEG C, and carrying out secondary tempering for 2-4h at the temperature of 450-650 DEG C to prepare the sintered Nd-Fe-B. The invention also discloses the high-coercivity sintered Nd-Fe-B. According to the preparation method disclosed by the invention, by virtue of low melting point auxiliary alloy, the wetting temperature between a grain boundary phase and a main phase is lowered, the wetting time is prolonged, the utilization ratio of heavy rare earth is increased, the used amount of rare earth is lowered, the process is simple, the cost is low, and the high-coercivity sintered Nd-Fe-B is suitable for mass production.

A process for producing a highly oriented graphene film (HOGF), comprising: (a) preparing a graphene oxide (GO) dispersion having GO sheets dispersed in a fluid medium; (b) dispensing and depositing the dispersion onto a surface of a supporting substrate to form a layer of GO, wherein the dispensing and depositing procedure includes subjecting the dispersion to an orientation-inducing stress; (c) removing the fluid medium to form a dried layer of GO having an inter-plane spacing d₀₀₂ of 0.4 nm to 1.2 nm; (d) slicing the dried layer of GO into multiple pieces of dried GO and stacking at least two pieces of dried GO to form a mass of multiple pieces of GO; and (f) heat treating the mass under an optional first compressive stress to produce the HOGF at a first heat treatment temperature higher than 100° C. to an extent that an inter-plane spacing d₀₀₂ is decreased to a value less than 0.4 nm.

The invention discloses a preparing method of SmCo7 permanent magnet alloy whose grain size is smaller than 20nm, the RE, Co, Fe, Cu, T whose fineness is bigger than 99. 9% is mixed together just as proportion of RE(CobalFexCuyTw)z and placed in the induction furnace, the alloy ingoting which is after the fusion is cased into the quartz tube equipped with nozzle at the bottom to be melt, ejected to the surface of copper roller which is tail-wagging via the nozzle at the bottom of the quartz tube to form amorphous state alloy belt, the film belt obtained is airproofed in the quartz tube, then it is placed to the microwave welding furnace for crystal process, the temperature and time range of crystal process in the microwave welding furnace is 400-900deg.C and 10min-180min, then it is placed into water for cooling. The craftwork of the invention is simple, the cost is low, the grain size of nanometer crystal magnet which includes SmCo7 main phase is about 20nm, and it is lower than grain size obtained by general heat treatment method, the exchange coupled function between grains is increased greatly.

The invention provides conductive slurry and transparent conductive coating. The conductive slurry comprises the ingredients of metal conductive filler, a resin substrate, nanometer filler particles and/or colloid particles and a solvent. By adoption of the technical scheme of the invention, the conductive slurry system is uniform and stable, and has the characteristics of electrical conduction, antireflection, diffusion promotion, and mechanical comprehensive performance improvement; a one-step preparation method for the transparent conducive coating is realized through the slurry, and the transparent conducive coating also can be prepared by a three-step method; the prepared conducive coating has high light transmittance, high electrical conductivity, and excellent mechanical comprehensive performance; and in addition, the preparation method has a simple process, a low cost, high repeatability and a low processing temperature, so that the conductive slurry and the transparent conducive coating have high industrial application prospect.

The invention discloses a synthesis method of graphitized ordered mesoporous carbon at low temperature. The method comprises the following steps: by a soft template path, introducing a metal precursor salt with a catalytic graphitizing effect in the organic-organic self assembly process of a carbon source and a surfactant, then carbonizing in an inert gas atmosphere, and carrying out one-step synthesis to obtain the graphitized ordered mesoporous carbon material. The method combines two independent steps of synthesis of the mesoporous carbon material and metal load into one step, greatly simplifies the synthesis steps, has simple and convenient operation, combines the carbonization process and the graphitizing conversion process, reduces the damage of high temperature to the ordered structure of the material, and greatly reduces the heat treatment temperature of graphitizing by utilizing the catalytic effect of metal. Compared with non-graphitized ordered mesoporous carbon material, the material serving as a catalyst carrier shows better electro-catalysis performance and provides a new choice for fuel-cell catalyst carriers.

The invention belongs to the field of rare earth permanent magnetic materials, and particularly relates to a method for accelerating permeation of a Dy/Tb adhesive layer on the surface of a sintered neodymium-iron-boron magnet. The method is characterized in that a Dy/Tb element is subjected to high-pressure thermal treatment of 1-100MPa after being adhered to the surface of a sintered neodymium-iron-boron magnet, so as to accelerate permeation of the Dy/Tb element on a grain boundary of the sintered neodymium-iron-boron magnet, thus a high-coercivity magnet is obtained. The method specifically comprises the following processing steps: firstly, carrying out cleaning treatment on the surface of the neodymium-iron-boron magnet; attaching the Dy/Tb element to the clean surface of the neodymium-iron-boron magnet, and then carrying out high-pressure thermal treatment on the Dy/Tb element, so as to rapidly permeate the Dy/Tb element on the grain boundary of the magnet; further improving the magnet boundary structure through medium-temperature thermal treatment, and finally obtaining the high-coercivity neodymium-iron-boron magnet. The method has the outstanding advantages that the permeation of the Dy/Tb element on the grain boundary can be accelerated through high-pressure thermal treatment; a relatively thick sample can be processed; the thermal treatment temperature is greatly reduced; the thermal treatment time is shortened; and the efficiency is significantly improved.

The invention discloses a tin/copper foam alloy cathode material for lithium ion cells and a preparation method thereof. In the invention, foam copper serving as a substrate is coated and plated with tin/copper alternate multilayer lamination structure; and then the tin/copper alloy cathode material is obtained by heat treatment. A tin coating is formed directly on the foam copper strip substrate, and a copper coating is formed on the outmost layer; in the multilayer lamination structure, each coating is 0.1 to 1.0 micrometer thick, and the thicknesses of all coatings are the same; the thickness ratio of each tin coating to each copper coating is 1:1.7-1:2.1; and the heat treatment temperature is 150 to 400 DEG C and the heat treatment time is 0.5 to 6 hours. The tin/copper foam alloy cathode material prepared by the method has a high charge-discharge specific capacity and high cycle performance; and the maximum primary discharge specific capacity is up to 610mAh/g, and after 50 circles, the specific capacity reduces only by 1 to 3 percent. In the invention, the preparation process is simple, and large-scale industrial production can be performed.

The present invention discloses fast microwave crystallizing process for preparing nanometer crystalline iron-base soft magnetic alloy. The technological process includes the following steps: 1. smelting alloy with Fe, Cu, Nb, Si and B in the ratio of Fe73.5Cu1Nb3Si13.5B9 in an induction furnace at vacuum 3-10 Pa in high purity Ar; 2. setting coarsely crushed alloy inside quartz pipe with nozzle in the bottom, setting the quartz pipe inside induction coil in a belt spinning machine, and melting the mother alloy in protecting Ar atmosphere; 3. spraying the alloy liquid under the pressure of Ar to the surface of rotating copper roller to form non-crystalline alloy belt; and 4. sealing the thin belt in quartz tube and crystallizing treatment in a microwave sintering furnace at 400-900 deg.c for 10-180 min to obtain ideal nanometer crystal structure.

The invention discloses a carbon nano tube enhanced tin-copper-nickel alloy cathode used for a lithium ion battery, and a preparation method of the cathode. According to the invention, the electroplating method is adopted to composite carbon nano tubes into an electrode, and chemical nickel plating processing to the carbon nano tubes is performed before electroplating; and furthermore, a Cu-(CNTs-Ni) connection layer is added between active material and a current collector, thereby improving the circulation property of the alloy cathode greatly. According to the invention, copper foil is used as a current collector (electroplating substrate) to composite and electroplate a Cu-(CNTs-Ni) composite coating and a Sn-(CNTs-Ni) composite coating in sequence, and finally the carbon nano tube enhanced tin-copper-nickel alloy cathode is obtained by heat treating. The lithium ion battery tin-copper-nickel alloy cathode prepared by adopting the method has a specific discharge capacity of 500-700 mAh/g for the first time, and the specific capacity is only decayed by 4-6 percent after 200 times of circulation. According to the invention, the process is simple, the performance of the prepared alloy cathode is good, and the alloy cathode is suitable for performing large-scale industrialized production.

The invention discloses a pretreatment method for improving dimension stability of timber. The method comprises the following steps: pretreating timber with glycerin and then carrying out air seasoning on the timber so as to enable the water content of the timber to decline to less than 15%; putting the timber into a heat treatment box, turning on a vapor switch, allowing the temperature of the heat treatment box to rapidly rise to 140 DEG C at a rate of 10 to 20 DEG C/h, keeping the temperature for 30 to 60 min, and drying the timber at a high temperature so as to enable the water content of the timber to decline to 0; allowing the temperature to rise to 160 DEG C to 200 DEG C and maintaining heat treatment for 2 to 5 h; turning off the vapor switch, allowing the temperature of the heat treatment box to decline, turning on the vapor switch when the temperature of the heat treatment box declines to 80 DEG C, adjusting the water content of the timber to be 7% to 10%, and moving the timber out. According to the invention, pretreatment of the timber with an aqueous solution of glycerin enables pyrolysis of chemical components in the timber to be accelerated, molecular chains of the timber to break and to form new crosslinked bond, and dimension stability and corrosion resistance of the timber to be effectively improved.

The invention discloses a preparation method and the application of a fixed bed framework metal catalyst. The method includes: adopting a halogen substituted organic polymer as a coupling agent of active metal aluminum alloy powder, preparing aluminum alloy powder containing transition metal in VIII class, IB class or VB class into particles in certain shapes, adopting forming methods like direct kneading method for band extrusion or tabletting or coating method for attaching the alloy powder on the surface of a carrier with certain strength, subjecting the formed particles to heat treatment under certain atmosphere for improving strength, and activating with an inorganic alkaline solution to obtain the fixed bed framework metal catalyst. The catalyst prepared by the method can be used for fixed bed hydrogenation reaction of unsaturated organic compounds like aldehyde, ketone, ester, nitrile, olefine, aromatic and nitro compounds. The aluminum alloy particles are low in heat treatment temperature, the strength of the carrier can be fully utilized by the coating method, and the aluminum alloy particles after being activated have excellent hydrogenation activity and stability.

The invention discloses a preparation method for high-performance conducting copper slurry. The preparation method includes the steps of firstly, dissolving copper precursor and surface protective agent in organic solvent to obtain reaction liquid A; dissolving reducing agent in organic solvent to obtain reaction liquid B; secondly, feeding reaction liquid A and B into a micro-reactor respectively through a delivering pump, and mixing for reaction; thirdly, adding precipitator to reaction liquid obtained in the second step, separating by filtering or centrifuging, and cleaning obtained precipitate; and fourthly, dispersing cleaned precipitate with non-polar or weak-polar solvent to obtain the high-performance conducting copper slurry. The conducting copper slurry obtained by the preparation method requires low thermal treatment temperature after printing, and is high in metal content which can exceed 60%.

The invention relates to an anode active material and a preparation method and application thereof. The anode active material includes: silicon oxide particles; and elemental silicon nanoparticles dispersed in the silicon oxide particles, wherein the median particle size of the monatomic silicon nanoparticles is 0.2-20 nm; the silicon oxide particles comprise lithium, the lithium in the silicon oxide particles comprises a lithium silicate compound, and the lithium silicate compound comprises one or more of Li2Si2O5, Li6Si2O7, Li2SiO3, Li8SiO6 and Li4SiO4. The anode active material disclosed bythe invention has the advantages of high capacity and coulombic efficiency, good multiplying power and cycle performance, the low expansion rate and the like when being used in a secondary battery. The preparation method is good in repeatability and high in safety. The secondary battery provided by the invention has the characteristics of high volume energy density, good rate capability, good cycling stability, low expansion rate and the like.

A method for preparing positive electrode multielement active material containing lithium / manganese composite oxide includes directly using lithium hydroxide coprecipitation to prepare M ( OH )2 , mixing it with lithium salt in grinding , forming plate by pressing , prebaking , cooled ball grinding , forming plate by pressing and backing . In the method , applied nickel salt is nickel acetate or nickel nitrate , applied cobalt salt is cobalt acetate or cobalt nitrate, applied manganese salt is manganese nitrate or manganese acetate and applied lithium salt is lithium carbonate or lithium acetate .

The invention discloses a method for peroxy titanic acid with visible-light activity for supported photocatalyst. Wherein, preparing clear solution with given concentration by TiSO4 to drip with diluted ammonia into deionized water with given pH value as basic solution; mixing and holding given pH value to form precursor deposition of titanium oxide; continuing to mix for some time; taking solid-liquid separation to the suspending liquid to clean for 3-5 times, dripping some H2O2 peptizer to deposite and obtain the product. The film coating can crystallize and form anatase phase at 150Deg. The membrane layer particle is 10-20 nano sphere or ~20X~100 nano column.

The invention discloses a method for hard carbon negative electrode materials of a lithium ion battery and belongs to the technical field of hard carbon negative electrode materials of the lithium ion battery. By means of the method, one or several kinds with any proportion of sulfuric acid, sulfate, boric acid, borate, phosphoric acid, phosphate, muriatic acid, muriate and ammonia or ammonium salt is/are chosen as a catalyst/catalysts for preparing the hard carbon negative electrode materials of the lithium ion battery in a catalysis method, and compared with the catalysts used in the prior art, the catalysts used in the preparing process of the materials are reduced in low-temperature section stabilized heat treatment temperature, the time is shortened by nearly 10 times, a large number of resources are saved, production cost is reduced, and capacity is improved.

The preparation process of medium porous nano silica powder includes hydrolysis and condensation reaction of silicate ester to prepare SiO2 sol, preparing SiO2 gel, ageing and drying SiO2 gel. It features the heat The of aged and dried white amorphous SiO2 at 150-200 deg.c for 5-8 hr; and ball milling of the powder after heat treatment for 8-48 hr. The said process can produce medium porous nano SiO2 powder with grain size distribution of 5-50 nm, average pore diameter 5.1-5.9 nm, porosity 85-93 %, surface hydroxy content 51-55 %. The product may be used as selective absorbent, loaded catalyst and various sensors as well as in the production of ink absorbent, sunproof record paper and cosmetics. The produced powder has purity as high as 99.9 %, extremely high activity and low cost.

The invention discloses a high-strength high-toughness steel plate. The steel comprises the following chemical components in percentage by weight: 0.032-0.11% of C, 0.10-0.26% of Si, 1.51-1.80% of Mn, 0.03-0.06% of Nb, 0.012-0.020% of Ti, at most 0.052% of V, at most 0.20% of Mo, at most 0.40% of Ni, at most 0.30% of Cr, at most 0.15% of Cu, at most 0.018% of P, at most 0.0020% of S, and the balance of Fe and inevitable impurities. The invention also discloses a preparation method of the high-strength high-toughness steel plate, which comprises the following steps: 1) blank casting; 2) heating; 3) rolling; 4) cooling; 5) heat treatment; and 6) air cooling. The method has the advantages of simple hot rolling technique, low heat treatment temperature, short holding time, low energy consumption and lower production cost, obtains the product with higher quality, and enhances the yield.

The invention discloses a preparation method of a high-rate capacity lithium iron phosphate material, which comprises the steps of: weighing FePO4.xH2O and a lithium source compound as raw materials according to the mol ratio of Li to Fe of (1-1.05) :1, adding a carbon source compound and a catalyst (nitrate or acetate of Fe, Co, Ni and the like), ball-grinding for 0.5-24h by using deionized water, absolute ethyl alcohol or acetone as a ball grinding medium to obtain slurry, spraying and drying the slurry and then thermally treating under the protection of an inert gas, and in the process, with the thermal cracking of the carbon source compound, promoting the carbon source compound to form a carbon cladding cover with higher graphitization crystallinity under a lower temperature through mutual action of the catalyst and the carbon source compound. The lithium iron phosphate cathode material prepared by adopting the preparation method has higher electronic conductivity and higher specific capacity under the condition of lower carbon content, greatly improved high-rate performance especially, and better application value in the field of power batteries.

The invention discloses a mullite fiber preparation method which is efficient, rapid, environment-friendly and low in cost. The method includes: taking raw materials according to stoichiometric ratio of elements in the mullite fiber chemical formula, preparing colloid, performing fiber forming and drying for colloid discharging to obtain mullite non-crystal fiber, adding the fiber into a sagger made of wave permeable materials, placing the sagger in a special microwave oven, controlling heating rate by adjusting the microwave power under the air or oxygen atmosphere, heating to a heat treatment temperature, and cooling to the room temperature to obtain the mullite fiber. The mullite fiber prepared by the method is high in impurity and low in porosity, the grain size is about 30nm, and the fiber diameter ranges from 6 micrometers to 10 micrometers. Further, the mullite fiber is excellent in uniformity, brittle fracture and chalking of the fiber are greatly reduced, yield is increased, heat treatment temperature is lowered, heat insulation time is shortened, and production efficiency is greatly improved.