387results about How to "Lower crystallization temperature" patented technology

A method for crystallizing an amorphous layer into a polycrystalline layer. The method uses a substrate under the amorphous layer and a nickel film on the amorphous layer, which are subjected to a heat treatment. The nickel film is formed by a coating step that uses a nickel-containing solution. Alternatively, a nickel and gold, or a nickel and palladium, solution can be used. The method eliminates contamination with metal in the polycrystalline silicon layer and reduces its growth temperature.

The invention relates to a preparation method of a molecular sieve, and provides a method for preparing ZSM-22 molecular sieve by using a seed crystal synthesis method. The method comprises the following steps of: uniformly mixing deionized water with aluminum sulfate; adding alkali sources into a mixture; adding tetraethoxysilane under stirring; continuously stirring until the solution is uniform to form silicon-aluminum gel; adding ZSM-22 molecular sieve crystal seed to stir; putting the mixture into a reaction kettle for crystallization reaction; and filtering and drying a product to obtain ZSM-22 molecular sieve raw powder. By using the preparation method, the application of organic template agent is eliminated, the crystallization time is shortened, the crystallization temperature is reduced, and the industrial application is facilitated; the product keeps good crystallization degree and purity and high catalytic reaction activity; the unnecessary loss during production is reduced; the product has a potential application value on some important catalytic reaction; and inorganic raw materials used in production is environmentally-friendly and low in cost.

The invention discloses a microcrystalline glass ceramic binding agent, a preparing method thereof, an SG grinding wheel and a preparing method thereof. The binding agent is prepared from, by weight percentage, 40% to 65% of SiO2, 6% to 20% of Al2O3, 5% to 18% of Na2O, 0.5% to 5% of CaO, 3% to 10% of K2O, 8% to 35% of B2O3, 0.5% to 2% of MgO and 2% to 6% of TiO2. The microcrystalline glass ceramic binding agent is formed by reasonably selecting the raw materials, the scientific ratio is adopted, the binding agent has the beneficial effects of being low in thermal expansion coefficient and crystallization temperature and high in strength accordingly, the microcrystalline glass ceramic binding agent is suitable for being used as a binding agent of the SG grinding wheel, the firing temperature of the SG grinding wheel is greatly reduced, and the firing time of the SG grinding wheel is greatly shortened; and meanwhile the work efficiency and the machining accuracy of the SG grinding wheel are improved, grinding heat is reduced, and the service life of the grinding wheel is prolonged.

The invention relates to a method for synthesizing MCM-22 molecular sieve. The method comprises the following steps of: preparing gel consisting of a silicon source, an aluminum source, an organic template agent, halogen compounds, alkali and water; then crystallizing the gel; and performing the traditional steps of filtering, washing, drying and roasting so as to obtain product of the MCM-22 molecular sieve, wherein the organic template agent can be dimethyleneimine, and also can be a mixed template agent composed of the dimethyleneimine and one or more than one of hydrocarbon, organic amine, alcohol and ketone. Compared with the prior art, the method has the advantages of low crystallization temperature, short crystallization time, high yield coefficient of product, high product quality and the like. The MCM-22 molecular sieve produced according to the invention has excellent catalytic performances of catalytic cracking, olefin alkylating, benzene alkylating and the like.

Based on the crystal heteroepitaxial growth principle, the invention provides a low-temperature preparation method of depositing a vanadium dioxide film on a glass substrate without changing the quality (thermochromatism) of the vanadium dioxide film. Using glass as substrate, the method comprises the following steps: 1) cleaning and pre-treating the glass substrate; 2) depositing a vanadium dioxide diffusion barrier layer on the glass substrate; 3) depositing a zinc oxide seed crystal layer on the vanadium dioxide diffusion barrier layer; and 4) depositing a vanadium dioxide thermochromic layer on the zinc oxide seed crystal layer. The vanadium dioxide thermochromic layer has low crystallization temperature and lattice constant matched with vanadium dioxide, and is particularly suitable for the heteroepitaxial growth of the vanadium dioxide film. Therefore, the invention can efficiently reduce the deposition temperature of vanadium dioxide film, simplify the process of producing intelligent vanadium dioxide glass, minimize cost and energy consumption, and greatly reduce the difficulty in industrialization of intelligent vanadium dioxide glass.

The invention relates to a synthesis method of a low-silicon nano SAPO-34 molecular sieve, which comprises the following steps: sequentially mixing a silicon source, an aluminum source, a template agent R, deionized water and a phosphorus source to obtain a gel mixture; placing the gel mixture in a stainless steel high-pressure reaction kettle of which the liner is made of polytetrafluoroethylene, sealing, putting into a drying oven, and performing primary traditional hydrothermal crystallization; adding a dispersant agent S into the primary traditional hydrothermal crystallization solution, stirring for 0.5-4 hours, transferring into the reaction kettle of which the liner is made of polytetrafluoroethylene, sealing, putting into a microwave reactor, and performing secondary microwave hydrothermal crystallization; and washing, drying, and roasting to obtain the nano SAPO-34 molecular sieve. Compared with the prior art, the invention greatly lowers the crystallization temperature and shortens the time of the whole synthesis process. The nano molecular sieve can be widely used for conversion, separation and absorption of hydrocarbons, and especially has the advantages of high conversion rate, high low-carbon alkene selectivity, low carbon deposition rate, long reaction life and the like in the process of preparing alkene from methanol.

The invention relates to a piece of growth equipment and a growth method for large-size gallium oxide monocrystalline. The equipment comprises the following components: a zirconia insulating brick (1), a quartz cylinder (2), a water cooling copper electrode (3), an iraurita crucible (4), a heat exchanger (6), and an infrared thermometer (7). The method comprises the following steps: the iraurita crucible (4) is placed in the crystal growth furnace cavity formed by the zirconia insulating brick (1), the outside of the zirconia insulating brick (1) is provided with the quartz cylinder (2) and the water cooling copper electrode (3) in order, the heat exchanger (6) is placed at the bottom of the iraurita crucible (4), the infrared thermometer (7) is connected to the iraurita crucible (4), andthe iraurita crucible (4) contains a gallium oxide solution (8) and seed crystal (5). Compared with the prior art, heat exchange method is used for growing crystal, the efficiency is improved, and production cost is reduced; at the same time, grown crystal has the advantages of excellent quality, little stress, low dislocation density, good crystal perfection and optical homogeneity, improved utilization rate of the gallium oxide material, and simplified processing operation.

The present invention relates to a Li₂O-Al₂O₃-SiO₂ system ultra-low expansion coefficient high-transparency glass-ceramic and production method of the products. Calculated by weight percentage, the ultra-low expansion coefficient high-transparency glass-ceramic is composed of 3.2 to 4.6 percent of Li₂O, 18.0 to 23.6 percent of Al₂O₃, 64.1 to 69.4 percent of SiO₂, 0.3 to 0.8 percent of MgO, 0.8 to 2.5 percent of BaO, 0.3 to 0.8 percent of R₂O, 0.01 to 0.4 percent of Y₂O₃, 1.8 to 2.5 percent of TiO₂, 1.6 to 2.4 percent of ZrO₂, 1.1 to 1.8 percent of P₂O₅, 0.6 to 1.5 percent of Sb₂O₃, 0.3 to 1.0 percent of NaCl and 1.0 to 2.0 percent of NH₄NO₃. The heat-resistant glass plates and heat-resistant glass products can be manufactured by using the formula and the corresponding forming die. The present invention has the advantages that the production technique is simple, the produced products have low expansion coefficient, good transparency, high thermal impact temperature, high strength, have constant transparency when being used under the temperature of 700 Celsius system for a long time, the products have long service life, etc.

The invention provides a balanced macroelement clear liquid fertilizer and a preparation method thereof. The clear liquid fertilizer comprises a urea-formaldehyde nitrogen solution, a water-soluble phosphate fertilizer and a water-soluble potassic fertilizer, wherein the urea-formaldehyde nitrogen solution comprises urea, methylol urea, methylene urea and triazinone compounds. Therefore, the urea-formaldehyde nitrogen solution is taken as a basic nitrogen fertilizer raw material to be mixed with the water-soluble phosphate fertilizer and the water-soluble potassic fertilizer so as to obtain the clear liquid fertilizer containing macroelements, wherein the methylol urea, methylene urea and triazinone compounds in the clear liquid fertilizer can stably provide sustained-release nitrogen after being absorbed by plants, thereby increasing the utilization rate of a nitrogen fertilizer and enhancing the fertilizer efficiency; the crystallization temperature of the clear liquid fertilizer canbe as low as 10 DEG C or even as low as 30 DEG C or below, thereby further expanding the safe application area of the clear liquid fertilizer; the preparation cost is lower, and the cost performanceis high; the long-term storage stability is good, and precipitates do not appear easily.

The invention relates to a method for preparing an SHS ceramic liner metal tube from iron-based wastes and discloses a method for manufacturing a corrosion-resistant and wear-resistant ceramic liner metal tube. The technical scheme is that: the treated iron-based wastes and Al powder are proportioned, mixed and sintered through an SHS centrifugal thermit reaction; an iron alloy layer and a ceramic layer are formed on an inner wall of the metal tube under the action of centrifugal force; and the prepared metal tube has the sandwich structural characteristic, namely the ceramic layer 1, the iron alloy layer 2 and a metal tube substrate layer 3 are formed from the interior to the exterior in turn. The method for preparing the SHS ceramic liner metal tube solves the problem that the conventional ceramic liner metal tube has over-high manufacturing cost and ceramic surface quality defect, and improves the wear resistance and corrosion resistance of the tube. The prepared metal tube can be widely applied to conveying powder, slurry and tailings in metallurgy, mines, electric power, coal and other industries.

The invention discloses a low-fiber-emergence low-warping high-tenacity flame-retardant PET/PETG composite material and a preparation method, and relates to the field of high polymer materials. The composite material is prepared by mixing 30-50 parts of PET resin, 5-20 parts of PETG resin, 0.1-1 part of a coupling agent, 2-8 parts of a flexibilizer, 11-15 parts of a fire retardant, 0-1 part of a nucleating agent, 0.1-1 part of an antioxidant and 0.1-1 part of a lubricating agent, adding 15-30 parts of irregular-shaped glass fibers during the extrusion process of a twin-screw extruder, extruding, and pelletizing to obtain. The preparation method of the low-fiber-emergence low-warping high-tenacity flame-retardant PET/PETG composite material disclosed by the invention utilizes the characteristic that the PETG resin is well compatible with the PET resin; the addition of the flame-retardant system PETG, the flexibilizer and the nucleating agent greatly improves the processing performance, the surface performance and the impact performance of the composite material, while influencing the other performances a little; meanwhile, the addition of the PETG and the irregular-shaped glass fibers reduces the crystallization temperature and the crystallization rate of the material, and lowers the warping degree.

The invention discloses a bismuth ferrite base film layer stacked structure capacitor and a preparation method thereof, wherein the capacitor comprises a bottom electrode, a substrate, a buffer layer, a ferroelectric film layer and a metal point electrode in sequence from the bottom to top; the buffer layer is a manganese-doped barium strontium titanate film, the chemical formula is Ba0.6Sr0.4Ti(1-x)MnxO3, x is the mole equivalent of element manganese, and x is equal to 0.005-0.05; and the ferroelectric film layer is a bismuth ferrite base film, the chemical formula is Bi(1-y)LnyFeO3, wherein Ln is one of lanthanide, y is the mole equivalent of lanthanide, and y is equal to 0.01-0.2. The preparation method is simple, and the obtained capacitor is a storage cell of a ferro-electric field effect transistor; and the capacitor overcomes the defects that the bismuth ferrite base film capacitor on ordinary silicon substrate has the defects of poor interface performance and high working voltage, and has good energy storage performance.

The invention provides a method for carrying out a heat treatment required during the manufacture of a thin film transistor (TFT) at relatively low temperatures. In this method, in a heating step in which at least a portion of a silicon-based semiconductor layer is crystallized, a silicide is formed in a source region and a drain region in the semiconductor layer. A TFT according to the invention includes a silicon-based semiconductor layer having a channel region, a source region and a drain region being so disposed as to sandwich the channel region, a source electrode electrically connected to the source region, a drain electrode electrically connected to the drain region, and a gate electrode insulated from the source electrode and the drain electrode, and the source region and the drain region contains a silicide.

The invention discloses a low-temperature-resistant and abrasion-resistant cable. The low-temperature-resistant and abrasion-resistant cable comprises a conductive cable core, an inner protective cover and an outer protective cover. The conductive cable core is wrapped by the inner protective cover, and the inner protective cover is wrapped by the outer protective cover. The outer protective cover comprises polymethylvinylphenylsiloxane gum, hydrogenated butadiene-acrylonitrile rubber, solution polymerized styrene-butadiene rubber, methyl fluorine silicone oil, epoxidized soybean oil, dioctyl nylon acid ester, fumed silica, micro gelating capsule red phosphorus, melamine phosphate, dicumyl peroxide, vinyltriethoxysilane, zinc oxide, Ca/Zn compound stabilizer, TX-1 type rare-earth stabilizer, magnesium stearate, antioxygen 1076, phosphorous acid trioctyl ester and silicone powder. The low-temperature-resistant and abrasion-resistant cable is good in low temperature resistance and high in tenacity and abrasion resistance.

The invention discloses a method for preparing solid honey and relates to a method for preparing food, in particular to a preparation method for hardening honey. The method mainly comprises the steps of material selection, mixing and crystallization. The steps in detail are as follows: a. a material is selected, in which exquisite honey with small crystallization nucleus is selected as a crystallization revulsant; b. at a temperature of between 50 and 55 DEG C, honey is condensed till Be is between 39 and 45 degrees or the water content is between 14 and 25 percent and is cooled; c. when the temperature is cooled to 40 DEG C, the exquisite honey selected in the step a is added into the honey obtained in the step b; and d. the honey is stirred and is continuously cooled to a temperature of between 10 and 14 DEG C; the humidity of air is controlled less than or equal to 58 percent; and the honey is recrystallized to obtain the solid honey. The method has a simple process, easy control of the process course and low crystallization temperature, well protects the effective nutritive compositions of the honey, does not need to add minor ingredients additionally to realize the solidification of the liquid honey, ensures the original flavor and nutrition of the honey to the maximum and brings great convenience for people to store, carry and eat the honey.

The invention discloses a method for preparing a magnetic P-type molecular sieve by using coal gangue. The method comprises: 1, grinding coal gangue, and carrying out high temperature calcining activating on the grinded coal gangue by using sodium carbonate; 2, oxidizing at a low temperature, adding hydrochloric acid, soaking, and filtering; 3, preparing an iron-doped molecular sieve from the filtration residue and the filtrate obtained after the filtration; and 4, placing the iron-doped molecular sieve in a porcelain boat, placing the porcelain boat in a tubular furnace, introducing nitrogen into the tube furnace, introducing hydrogen after the air in the tubular furnace is completely discharged, heating to a temperature of 650-700 DEG C, continuously carrying out a reduction reaction for 2-3 h, introducing nitrogen after completing the reaction, and cooling to a room temperature to obtain the magnetic P-type molecular sieve. According to the present invention, the coal gangue is used as the raw material, the Fe<3+> dissolution is performed with hydrochloric acid and is complexed by adding oxalic acid, and finally high temperature reduction is performed to prepare the magnetic P-type molecular sieve; the magnetic P-type molecular sieve has characteristics of high specific surface area and strong adsorption performance; and the magnetic P-type molecular sieve is easy to separate and recover through the external magnetic field, and the problem of high cost of the molecular sieve synthesis is solved.