104results about How to "Short heat treatment time" patented technology

New 7xxx aluminum alloy bodies and methods of producing the same are disclosed. The new 7xxx aluminum alloy bodies may be produced by preparing the aluminum alloy body for post-solutionizing cold work, cold working by at least 25%, and then thermally treating. The new 7xxx aluminum alloy bodies may realize improved strength and other properties.

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.

This method for manufacturing a high resistivity silicon wafer includes pulling a single crystal such that the single crystal has a p-type dopant concentration at which a wafer surface resistivity becomes in a range of 0.1 to 10 kΩcm, an oxygen concentration Oi of 5.0×10¹⁷ to 20×10¹⁷ atoms/cm³ (ASTM F-121, 1979), and either one of a nitrogen concentration of 1.0×10¹³ to 10×10¹³ atoms/cm³ (ASTM F-121, 1979) and a carbon concentration of 0.5×10¹⁶ to 10×10¹⁶ atoms/cm³ or 0.5×10¹⁶ to 50×10¹⁶ atoms/cm³ (ASTM F-123, 1981) by using a Czochralski method, processing the single crystal into wafers by slicing the single crystal, and subjecting the wafer to an oxygen out-diffusion heat treatment process in a non-oxidizing atmosphere. A peak position of a resistivity serving as a boundary between a p-type region of a wafer surface side and a p/n conversion region of an inner side of a thickness direction is adjusted by the nitrogen concentration or the carbon concentration such that the peak position is set to a boundary depth in a range of 10 to 70 μm from the wafer surface.

New 6xxx aluminum alloy bodies and methods of producing the same are disclosed. The new 6xxx aluminum alloy bodies may be produced by preparing the aluminum alloy body for post-solutionizing cold work, cold working by at least 25%, and then thermally treating. The new 6xxx aluminum alloy bodies may realize improved strength and other properties.

The invention discloses a system for drying sludge using a pulse combustion internal heating fluid bed. The system comprises a pulse combustor, a wet sludge feeding granulating device, an internal heating fluid bed drier, a dust removing device and a deodorizing device. The invention also discloses a corresponding process for drying the sludge using the pulse combustion internal heating fluid bed. According to the invention, the process that the pulse combustion is combined with the heating fluid bed is adopted for sludge drying, so that the drying intensity is improved, the energy consumption is reduced, the treatment quantity of waste gas is reduced, and meanwhile the oxygen content of the system is reduced; dust combustion and explosion danger are prevented; and the system and the process are safe and reliable.

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 present invention discloses Lithium lanthanum bismuthate-based solid electrolyte material and preparation method thereof. The chemical formula of the material of Lithium lanthanum bismuthate-based solid electrolyte after the doping of lanthanum and the doping of lithium are conducted is La(3-x)AxLi(5+delta)Bi(2-y)ByO12. In the formula, A is the lanthanum position dopant, X is a value from 0 to 1.25, B is the bismuth position dopant, and Y is a value from 0 to 1.25. The preparation method of the material is as follows: according to the formula, weighing nitrates or carbonates or chlorides or acetates or alkoxides or oxides soluble in acids of lithium, lanthanum, bismuth, the lanthanum-position dopant and/or the bismuth-position dopant, preparing a solution by using the above chemicals,adding a lanthanum salt solution, a bismuth solution, a solution of lanthanum-position dopant and/or a solution of bismuth-position dopant dropwisely, adding citric acid and nitric acid successively to obtain a sol, adding a water-soluble polymer into the sol to form a gel, drying the gel, performing heat treatment to obtain nanocrystal powder, moulding the powder into a green body, and calciningto obtain the Lithium lanthanum bismuthate-based solid electrolyte material. The prepared material can be used as a solid electrolyte material and can be applied to all-solid-lithium ion battery.

The invention provides a preparation method of a carbon/carbon nanotube coated lithium iron phosphate composite material by in situ synthesis, and relates to the technical field of battery materials. The preparation method provided by the invention comprises the steps of weighing raw materials of a lithium source, iron powder, a phosphate and a carbon source; first performing ball-milling on the iron powder and the phosphate and adding hydrogen peroxide; and then adding the lithium source and the carbon source to obtain a slurry, drying and sintering under the protection of reducing/inert gas to obtain the composite material. According to the preparation method provided by the invention, the carbon/carbon nanotube coated lithium iron phosphate composite material is prepared by employing an in-situ synthesis method, so the heat treatment time is short; the composite material has relatively high carbon coating rate, stable electrochemical property and relatively good consistency, the cycle performance and the rate performance are greatly improved, the whole preparation process is simple, and the preparation method has the advantages of safety, high efficiency, low cost and environmental protection, etc.

The invention relates to a nano/superfine medium-manganese TRIP (transformation induced plasticity) steel plate and a warm-rolling preparation method thereof, belonging to the technical field of ultrahigh-strength steel. The nano/superfine medium-manganese TRIP steel plate comprises the following chemical components in percentage by weight: 0.17-0.25wt.% of C, 0.00-0.50wt.% of Si, 5.00-7.00wt.% of Mn, 1.00-1.50wt.% of Al, 0.014-0.03wt.% of N, 0.00-0.06wt.% of Nb, 0.00-0.25wt.% of Mo, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: smelting, forging, carrying out hot rolling, and carrying out warm rolling to obtain the nano/superfine medium-manganese TRIP steel plate; and carrying out heat treatment on the steel plate to obtain the nano/superfine medium-manganese TRIP heat-treated steel plate. By using the warm-rolling technique instead of the typical technique for producing manganese steel, the method provided by the invention has the advantages of simple technique, short production cycle and controllable plate shape. The prepared steel plate has a nano/superfine structure, has the advantages of high strength and favorable properties, and satisfies the target requirements of resource saving, energy consumption reduction, light weight and crash safety enhancement for automobile industry.

The invention belongs to the technical field of the comprehensive utilization of secondary resource and particularly relates to a method for preparing a silicon carbon particulate reinforced composite material containing silicon-aluminum alloy by utilizing crystalline silicon cutting waste. The method comprises the following steps: firstly, pickling the crystalline silicon cutting waste to remove impurities such as iron oxide, metal impurities and a small amount of silicon dioxide in cutting waste, washing with water, filtering and drying to obtain a mixed micro-powder of silicon carbide and silicon with the particle size in the range of 0.5-10 mu m, mixing the silicon carbide micro-powder which accounts for 4.5-32.5% of the total mass fraction of the composite material and free silicon which accounts for 0.2-9.8% of the total mass fraction of the composite material with aluminum or aluminum alloy, performing strong stirring at a high temperature until silicon carbide is evenly dispersed and silica powder is dissolved, and rapidly solidifying to obtain the final product. The silicon carbide and silicon powder is waste in industrial production and widely available. The silicon carbon particulate reinforced composite material has the beneficial effects of high strength, fine grain size, low manufacturing cost and the like.

The invention relates to an electric field-assisted thermal treatment method of ZrTiAlV alloy sheets. The thermal treatment method mainly comprises the following steps: performing vacuum hotpressing deformation on 47Zr-45Ti-5Al-3V alloy sheets with the thickness of 1-2mm at 750DEG C-800DEG C by adopting a vacuum hot-pressing technology, wherein the deformation quantity is 10-30% of the initial thickness of the original sheets; filling the deformed sheets into a mold made of graphite materials, placing on spark plasma sintering equipment, applying mechanical pressure of 5MPa, loading pulse current onto 47Zr-45Ti-5Al-3V alloy sheets under the vacuum state of less than10<-2> Pa by utilizing a vertical pressure head and an electrified electrode so that the alloy sheets are discharged and heated the temperature of the 47Zr-45Ti-5Al-3V alloy sheets is fast raised to 600-700DEG C, performing heat preservation for 20min and then disconnecting and cooling to 20DEG C. The treated 47Zr-45Ti-5Al-3V alloy sheets have excellent comprehensive mechanical performance, the yielding strength is 1082MPa-1190MPa, the tensile strength is 1220MPa-1352MPa, the elongation after fracture is 7.5%-12.7%, and the applications of the 47Zr-45Ti-5Al-3V alloy in the engineering field can be realized.

The invention discloses a low-temperature semi-quenched and wear-resistant steel with the brinell hardness of 400 HB. The low-temperature semi-quenched and wear-resistant steel with the brinell hardness of 400 HB is prepared from the following components of, in percentage by weight, 0.08%-0.25% of C, 0.30%-0.50% of Si, 0.5%-1.0% of Mn, less than or equal to 0.01% of P, less than or equal to 0.005%of S, 0.60%-0.80% of Cr, 0.03%-0.05% of Al, 0.01%-0.02% of Ti, 0.02%-0.03% of Nb and 0.001%-0.004% of B; the production method comprises the following steps of performing RH vacuum treatment after conventional converter combined blowing and LHF furnace treatment; heating a casting blank; performing rough rolling; carrying out finish rolling; quenching; tempering at low temperature; and finishingfor later use. On the premise of ensuring the hardness value, a relatively soft bainite or sorbite metallographic structure is obtained at the core part of the steel plate, the surface of the steel plate is tempered martensite metallographic structure, so that the brinell hardness of the surface of the steel plate is greater than 400HBW, and the production cost is reduced by at least 10% comparedwith that of the prior art due to the addition of the alloy elements.