317results about How to "Shorten heat treatment time" patented technology

The invention discloses a preparation method of a polyacrylonitrile pre-oxidation fiber and a carbon fiber, belonging to the technical field of fiber preparation. The preparation method comprises the steps of: enabling polyacrylonitrile protofilament to pass through a continuous pre-oxidization device at a constant speed in a normal pressure and an air medium and carrying out pre-oxidization treatment, wherein the temperature rises by adopting 2-4 temperature zone gradients, and the total time is controlled within 30-45 min; in the low temperature stage of the pre-oxidization process, the reaction temperature is 200-240 DEG C, positive drafting accounting for 0%-8% of the total drafting is added, and the total time is 15-25 min; and in the high temperature stage, the reaction temperature is 240-275 DEG C, negative drafting accounting for 0%-3% of the drafting is added, the total time is 15-20min, the low temperature stage is divided into one or two temperature zones, and the high temperature stage is divided into one or two temperature zones, and the temperature of the 2-4 temperature zones rises in sequence, therefore the pre-oxidization fiber is obtained; furthermore, performing a regular carbonization treatment in the atmosphere of nitrogen for 5-8 min to obtain the carbon fiber. The preparation method of the polyacrylonitrile pre-oxidation fiber and the carbon fiber, disclosed by the invention, has the advantages of improving production efficiency of the pre-oxidization and shortening the pre-oxidization heat treatment time.

The invention discloses a processing technique for manufacturing golden tobacco shreds. The technique is characterized by comprising the processes of tobacco leaf selection, low-strength loose moistening, tobacco sheet selection, low-temperature storage, low-moisture flexible shredding and low-temperature leaf shred drying. The technique has the advantages that: (1) the prepared tobacco shreds are golden and have good appearance quality; on the one hand, the tobacco leaves with poor appearance quality in the tobacco leaf raw material are removed by adopting the tobacco leaf and tobacco sheet selection processes so as to improve the purity of the golden tobacco leaves in the tobacco leaf raw material; on the other hand, the tobacco sheet moisture content during shredding and the knife door pressure of a shredder are reduced by adopting the low-moisture flexible shredding process so that the tobacco shreds producing brown stains after shredding are reduced; and (2) the prepared tobacco shreds have predominant fragrance and good sense quality. The tobacco sheets are treated by adopting the low-strength loose moistening, low-temperature storage and low-temperature drying processes so as to reduce the return air temperature of a tobacco sheet loose moistening device, the storage environment temperature, the leaf shred drying temperature and the tobacco sheet heating time and reduce the fragrance loss of the tobacco sheets during preparing the shreds.

There is disclosed a semiconductor device and a method of fabricating the semiconductor device in which a heat treatment time required for crystal growth is shortened and a process is simplified. Two catalytic element introduction regions are arranged at both sides of one active layer and crystallization is made. A boundary portion where crystal growth from one catalytic element introduction region meets crystal growth from the other catalytic element introduction region is formed in a region which becomes a source region or drain region.

The invention discloses a preparation method for a nanoscale lithium titanate material with high specific capacity. The preparation method comprises the following steps: (1) preparing a liquid A; (2) preparing a liquid B; (3) under a condition of magnetic stirring, slowly adding the liquid B into the liquid A, so as to obtain a mixed dispersion liquid; (4) putting the mixed dispersion liquid into a high-temperature reaction still, then placing the high-temperature reaction still in a drying oven for reaction, after the reaction, naturally cooling to room temperature, leaching, washing with deionized water and absolute ethyl alcohol, and then drying under a condition that the temperature is 60-120 DEG C so as to obtain a precursor; (5) sintering the precursor for 1-5 hours in anitrogen atmosphere under a condition that the temperature is between 400-1000 DEG C, so as to obtain the nanoscale lithium titanate material; (6) immersing the nanoscale lithium titanate material in an acid solution with the hydrogen ion concentration of 0.01-14mol/L under a condition that the temperature is 20-200 DEG C, then leaching, washing with deionized water and absolute ethyl alcohol, and then drying, so as to obtain the nanoscale lithium titanate material with high specific capacity.

The invention discloses a heat treatment process for a ZL101A aluminium alloy for an automobile wheel hub. The process comprises the following steps of: putting an as-cast blank into a solution treatment furnace for raising temperature, performing solution treatment at a solution temperature, taking the blank out of the solution treatment furnace, quenching the blank, putting the as-cast blank into an ageing treatment furnace for raising the temperature, performing ageing treatment on the blank at an aging treatment temperature; and after taking the blank out of the ageing treatment furnace, cooling the blank in the air medium. The heat treatment process is characterized in that: the solution treatment temperature is 525 to 550 DEG C; the heat maintaining time during the solution treatment is 60 to 120 minutes; the ageing treatment temperature is 165 to 180 DEG C; and the heat maintaining time during the ageing treatment is 90 to 180 minutes. The heat treatment process organically combines the short-time solution treatment and the short-time ageing treatment and fulfils the aim of low energy consumption and high work efficiency. At the same time, compared with the standard T6 heat treatment process, the heat treatment process can shorten the heat treatment time by over one time and guarantee that an alloy microstructure obtained through the solution treatment and the ageing treatment reaches an ideal state of the standard T6 treatment.

The invention relates to a high-strength, high-conductivity and heat-resistant aluminum alloy conductor material and a preparation method thereof, and belongs to the technical field of alloy materials. The conductor material comprises the following components in percentage by weight: 0.2 to 0.3 percent of Zr, 0.15 to 0.25 percent of Er, less than 0.3 percent of impurities and the balance of aluminum. The preparation method comprises the following steps of: adding an AlEr intermediate alloy and an AlZr intermediate alloy in the process of smelting the aluminum, smelting at the temperature of 780+/-10 DEG C, preserving heat for 30 minutes, and casting; and performing homogenization treatment, rolling and heat treatment on an ingot in turn. Er and Zr in the component ratio are compositely microalloyed, a large number of precipitated phases which are distributed in a dispersed mode can be precipitated by the process, a large number of deformation structures can be stored, and the high conductivity (59.6 to 60 percent international annealed copper standard IACS), high strength (Vickers hardness 62.5 to 66.5) and heat resistance (capability of resisting the temperature of 375 DEG C in a short term and resisting the temperature of 225 DEG C in a long term) of the alloy are kept simultaneously.

The production method of soft magnetic alloy powder includes the following steps: smelting soft magnetic mother alloy, making molten metal be quickly coagulated into crystalline sheet alloy, breaking the sheet alloy to obtain alloy powder, and making the alloy powder undergo the processes of activation, annealing treatment and passivation treatment. Said soft magnetic alloy powder is low in oxygen content, stable in property and good in magnetic powder core performance.

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 .

A contact plug is formed in a semiconductor device having a silicon substrate having a gate electrode, a junction area and an insulating interlayer. A contact hole is formed to expose the junction area. A plasma process is carried out with respect to a resultant substrate, thereby removing natural oxides created on an exposed surface of the junction area. A first silicon layer is deposited on the contact hole and on the insulating interlayer. A heat-treatment process is carried out with respect to the first silicon layer so as to grow the amorphous silicon into the epitaxial silicon. A second silicon layer is deposited on the first silicon layer.

This invention discloses sol-gel preparation method of yttrium barium copper oxygen superconducting film. The materials are acetic yttrium, acetic barium, acetic copper, their mol ratio is that acetic yttrium 1 part, acetic barium 2 parts, acetic copper 3-4 parts, trifluoroacetic acid 4-10 parts, water 20-160 parts, acrylic acid 6-40, diethylene triamine 1-5, methanol 60-240, benzoyl acetone 1-10. Fluorine content of the sol is low, components are easy to adjust, chemical stability is good, and preparation process is simple. High temperature superconductive film made by this sol is easy to get superconductive thickness film, its technique repeatability is high, this method can be used to make large area yttrium barium copper oxygen film, the film porosity is low, surface purify is good, and good superconducting characteristic.

A thermal oxidation method capable of obtaining a high oxidation rate by generating a sufficient enhanced-rate oxidation phenomenon even in a low temperature region is provided. In addition, a thermal oxidation method capable of forming a silicon oxide film having a high reliability even when formed at a low temperature region. A basic concept herein is to form a silicon oxide film by thermal reaction by generating a large amount of oxygen radicals (O*) having a large reactivity without using plasma. More specifically, ozone (O₃) and other active gas are reacted, so that ozone (O₃) is decomposed highly efficiently even in a low temperature region, thereby generating a large amount of oxygen radicals (O*). For example, a compound gas containing a halogen element can be used as the active gas.

A heat treating technology for fining microscopic structure of cast TiAl alloy ingot containing A (45-48 at%) and Nb (6-8 at%) includes such steps as quenching in salt bath plus ageing one or more times, and high-temp forging.

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 invention discloses a processing method of a high precision steel ball. The processing method comprises the following steps: cold heading forming; annealing; ball polishing; primary soft grinding; primary hot pickling for appearance; secondary soft grinding; primary heat treatment; hard grinding; secondary cold pickling for appearance; removal of a corrosion layer; primary stabilizing; strengthening treatment; primary grinding; secondary stabilizing; lapping; appearance selection; super-lapping; secondary heat treatment; oil washing; detection. The processing method of a high precision steel ball provided by the invention shortens the whole quenching and heat treatment time during processing by 50% or more, greatly improves heat treatment efficiency, greatly improves the spheroidization rate, hardness and strength properties of the processed steel ball compared with the steel ball with long quenching and heat treatment time, prolongs service life, satisfies relatively high quality requirements on the steel balls of the roller industry, not only reduces labor intensity, manual input and production cost, but also ensures the quality of products, and increases the added value of the products.

The invention discloses a forming mold for semi-spherical components and a multi-pass forming method, belongs to the technical field of semi-sphere formation, and solves the problems of corrugation and cracking in deep drawing formation of high-height-diameter-ratio semi-spherical components, difficult control of deep drawing process parameters and weaker wall thickness uniformity in the prior art. The forming mold comprises a concave mold, a convex mold, a blank holder and a positioning plate; the concave mold and the convex mold are used for forming the semi-spherical components; the blank holder is arranged between the concave mold and the convex mold, and is matched with the concave mold to tightly press blanks to prevent corrugations of the blanks in the forming process; the blank holder is provided with a positioning plate; and the positioning plate is used for positioning an upper mold and a lower mold. The forming mold and the forming method are suitable for formation of high-height-diameter-ratio semi-spherical components.

The invention relates to a manufacturing method for medium-carbon cold forging steel rods and wires. The method comprises the following steps: low temperature rolling with a finish rolling temperature of 700 to 750 DEG C; rapid air cooling after rolling through cooling to 450 to 550 DEG C at a speed of no less than 0.5 DEG C/s; rapid induction heating pretreatment through heating to 730 to 750 DEG C at a speed of 5 to 15 DEG C/s and heat preservation for 2 to 3 min; and spheroidizing annealing heat treatment through heating to 760 to 780 DEG C with a furnace, heat preservation for 60 to 80 min, cooling to 680 to 710 DEG C, heat preservation for 80 to 120 min and air cooling out of the furnace. With the method provided by the invention, spheroidizing annealing heat treatment time for medium-carbon cold forging steel balls is substantially shortened by more than 50%, and heat treatment efficiency is greatly improved; obtained medium-carbon cold forging steel has at least a same balling rate and same hardness and cold forging performance compared with current medium-carbon cold forging steel annealed for a long time, and high requirements on cold forging steel in the fastener industry are satisfied.

The invention discloses a preparation method of a nanoscale zirconium-doped lithium titanate material. Nanoscale lithium titanate is prepared by the method, and simultaneously is modified through doping zirconium. According to the preparation method, chemical components and grain sizes of the lithium titanate are effectively controlled by using hydro-thermal treatment, the temperature during subsequent treatment is greatly reduced, and grains are prevented from being agglomerated; and the preparation method is easy to implement in industry. The lithium titanate is doped with the zirconium in a preparation process, so that the specific discharge capacity of the material is increased at high magnification. Simultaneously, the gas expansion problem existing in the charge-discharge process of lithium titanate batteries is solved to a certain extent. The material prepared by the method has high magnification and high specific capacity and can be applied to the batteries needed for various portable electronic equipment and various electric vehicles.

A composite superconducting wire and a method of manufacturing the wire is disclosed. Nano-particle dispersion strengthened copper is co-drawn with Niobium rod to produce DSC-1Nb wire. n numbers of DSC-1Nb wires are then stacked in a hollow DSC tube and drawn to form a DSC-n.Nb hexagonal wire. In a separate preliminary process, Tin rod is co-deformed with Copper tube to form a Cu-1Sn wire. m DSC-n Nb wires and 1 Cu-1Sn wires are then wrapped by Niobium foil and placed into a Copper tube. This entire assembly is then drawn to a finished size. The drawn composite is then subjected to heat treatment with a final stage at 650-700° C. for about 100 hours or longer. The new wire has higher electric critical current and higher mechanical strength than the controlled conventional ones.

The invention relates to a production method of oyster mushroom puffing chips, which belongs to the technical field of further processing of agricultural products. The production method of the oyster mushroom puffing chips comprises the following steps: harvesting oyster mushroom with good quality, removing the stem of the oyster mushroom, washing, carrying out fixation, boiling, pre-drying through hot air, carrying out vacuum microwave puffing and nitrogen packaging. Compared with the traditional process, the method has the advantages that by adopting the vacuum microwave puffing technology, the heat treatment time of the entire production process is short, the color, flavor and nutrients of the oyster mushroom can be maximally maintained, and the defects that the oil content is high, the color is poor, the taste is poor and the like in the traditional frying chips can be avoided. The oyster mushroom puffing chips prepared through the method have the characteristics of good shape, strong flavor, attractive color and crisp taste, and a feasible novel way is provided for the further processing and utilization of the oyster mushroom.