678results about How to "Avoid growing up" patented technology

A wet chemical process for preparing iron lithium phosphate includes mixing the solution or suspensions of Li source compound, Fe source compound, P source compound, doping element compound or electric conducting agent, and precipitant, reaction at 5-120 deg.C for 0.5-24 hr while stirring, filtering, washing, baking to obtain nano precursor, quickly heating to 500-800 deg.C in non-air or non-oxidizing atmosphere, calcining for 5-48 hr, and cooling. Its advantages are easy control, high uniformity and electric conductivity.

A process for preparing the hydrosol of nano-class anatase-type TiO2 features that reaction between Ti-contained organic substance, distilled water or deionized water, chelating agent and hydrodecomposing inhibitor at 30-120 deg.C for 3-12 hr while stirring and controlling pH=1-5.

The invention provides a method for using microwave method to produce LiFePO4 material, the character lies in: it uses microwave synthesis technology, uses the active carbon as the heating material for microwave receptor, thus the LiFePO4 material can be acquired. The process is: the Li2CO3 and FeC2O4íñ2H2O, (NH4) 2HPO4 are confected according to the resultant's proportion, they are put into the agate ball milling pot, uses the acetone as dispersant to ball grind for 4-12 hours, the mixed material are dried and pressed into pieces, and put into the aluminum crucible containing the active carbon and thermal retardation material, then the crucible is put into the household microwave stove, the frequency is 2.45GHz, the power is adjusted to the lower gear-middle gear, the time is 3-30 minutes, the synthesized product can be acquired. The merits of the invention lie in: the heating process is quick, the synthesizing time is short, and it prevents the crystal particle from growing; the energy consumption can be reduced.

The invention belongs to the technical field of steel rolling, and particularly relates to high-flexural-behavior hot-formed steel used for automobiles and a manufacturing method thereof. The steel comprises following trace elements by mass: 0.18-0.3% of C, not more than 0.3% of Si, 1-1.6% of Mn, not more than 0.015% of P, not more than 0.002% of S, 0.1-0.3% of Cr, 0.02-0.06% of Ti, 0.02-0.06% of Al, 0.0005-0.004% of B, not more than 0.004% of [N] and not more than 0.003% of [O]. The manufacturing method includes: heating a casting blank at a low temperature, performing controlled rolling in two stages, rapidly cooling, reeling up at a low temperature, preparing a steel coil by cold rolling and low-temperature critical annealing, shearing to prepare component tablets and performing hot press molding. By the manufacturing method, steel crystal grains are refined and ductility and toughness of the steel are enhanced, so that more energy is absorbed during deformation of the steel and automobile safety performance is enhanced.

The X65 pipeline steel for use in acid condition consists of C 0.02-0.05 wt%, Mn 1.20-1.50 wt%, Si 0.10-0.50 wt%, S not more than 0.0020 wt%, P 0.004-0.012 wt%, Nb 0.05-0.07 wt%, Ti 0.005-0.025 wt%, Mo 0.050-0.195 wt%, Cu not more than 0.35 wt%, Ni not more than 0.35 wt%, N not more than 0.0080 wt%, Ca 0.0015-0.0045 wt% and Ca/S not less than 2.0 except Fe. Its making process includes the following steps: smelting in a converter or an electric furnace; secondary steel making including LF desulfurizing + RH vacuum deairing and Ca treatment; continuous casting; rolling with initial rolling termination temperature of 940-1020 deg.c and finish rolling termination temperature of 780-840 deg.c; and winding at 500-580 deg.c. The X65 pipeline steel has low manufacture cost, high HIC resistance, high dynamic tear resistance and high impact toughness.

The invention relates to a method for rolling a difficult-to-machine metal material by combining electro-plasticity with temperature plasticity. The method comprises the following steps of: preheating a roller to the recovery temperature of a machined metal material and lower than the recrystallization temperature of the metal material; and inputting high-energy pulse current into a machining section of the moving metal material, performing electro-plastic treatment under the actions of the thermal effect and non-thermal effect of the metal material, and feeding the machining section into the preheated roller for rolling by combining electro-plasticity with temperature plasticity. In the rolling process, electro-plasticity and temperature plasticity are combined and unbalanced kinetic energy produced by the material due to the rise of atomic potential energy and strong electric stimulation of pulse current under heating condition is fully utilized, so that movement of crystal defects such as diffusion, dislocation and the like of atoms is facilitated, the internal microstructure of the metal material is improved, a tissue which is beneficial to enhancing of intensity and toughness (plasticity) is formed, and the plasticity of the material at low temperature is enhanced. The method is suitable for rolling difficult-to-machine metal materials such as magnesium alloys, nickel-titanium alloys, tungsten alloys and the like.

The invention discloses an in-situ synthesis method for a nano tin dioxide/carbon nano tube composite material, which mainly uses an inorganic tin salt, a carbon nano tube and an alkali source as raw materials. The experimental process mainly comprises the steps of precursor preparation, hydrothermal reaction, precipitate washing and drying and the like. The in-situ synthesis method for the nano tin dioxide/carbon nano tube composite material has the advantages that: a hydrothermal method is adopted to realize the in-situ deposition and the growth of the nano tin dioxide on the surface of the carbon nano tube; the obtained SnO2 nano particles have small and uniform particle size (less than 10nm), are well-crystallized, are uniformly coated on the surface of the carbon nano tube, and are tightly combined with the carbon nano tube; the composite material has potential application prospect in the aspects of a gas sensor material, an anode material of a lithium ion battery and the like. The method has no addition of any surface active agent, has simple and easily-obtained materials, simple process without pollution, short preparation period, mild reaction condition and low cost, and is suitable for large-scale production, so the method is an environment-friendly synthesis method.

The invention provides a preparation method of a TC4ELI titanium alloy bar. The preparation method comprises the following steps of: (1) carrying out cogging forging; (2) carrying out upsetting forging; (3) carrying out precise forging; (4) carrying out shearing, straightening and annealing treatment in sequence, thereby obtaining the cylindrical TC4ELI titanium alloy bar with the cross-section diameter of 15mm-90mm. The invention also provides a preparation method of the TC4ELI titanium alloy bar. The preparation method comprises the following steps of: (1) carrying out cogging forging; (2) carrying out upsetting forging; (3) carrying out precise forging; (4) rolling; (5) carrying out shearing, straightening and annealing treatment in sequence, thereby obtaining the cylindrical TC4ELI titanium alloy bar with the cross-section diameter of 8mm-15mm. The preparation method is simple in process, strong in repeatability and suitable for large-scale industrial production; the TC4ELI titanium alloy bar prepared by adopting the preparation method is uniform and fine in structure, high in microscopic structure level and excellent in mechanical property.

The invention belongs to the technical field of ceramic materials and discloses novel compact and superhard high-entropy boride ceramic as well as a preparation method and an application thereof. (M1xM2yM3zM4nM5m)B2 ceramic is prepared as follows: metal oxide, B4C and graphite powder are used as raw materials and pressed into a body after ball milling and mixing; high-entropy boride ceramic powderis obtained after thermal treatment; protective atmosphere is charged after the powder is heated to 1,000-1,400 DEG C, then, the powder is heated to 1,800-2,200 DEG C for calcination, and compact andsuperhard (M1xM2yM3zM4nM5m)B2 ceramic is prepared, wherein x is larger than or equal to 0.1 and smaller than or equal to 0.9, y is larger than or equal to 0.1 and smaller than or equal to 0.9, z is larger than or equal to 0.1 and smaller than or equal to 0.9, n is larger than or equal to 0.1 and smaller than or equal to 0.9, m is larger than or equal to 0.1 and smaller than or equal to 0.9, and the sum of x, y, z, n and m is 1. The ceramic material has relative density larger than 98%, hardness of 32-45 GPa, fracture toughness of 3-10 MPa.m<1/2 >and carbon content of 0.1wt%-1wt%.

The invention discloses a forming method of a maraging steel mold adopting selective laser melting. A three-dimensional structure of the mold is designed firstly by using three-dimensional design software such as Solidworks, ProE and Ug; and then the three-dimensional mold is subjected to slicing layering and route planning treatment, data are guided into a selective laser melting device, reasonable technical parameters are set, and the mold with a complex cooling channel is formed at a time. The mold formed by the method has the advantages of being high in compactness, few in internal defect, high in forming efficiency and high in free degree on the follow-up forming cooling channel. According to the forming method of the maraging steel mold adopting selective laser melting, the production period of the mold is effectively shortened, forming efficiency is high, external disturbance is small, the compressive property and production efficiency of the mold are remarkably improved, and meanwhile manufacturing cost is greatly reduced. After the directly-formed mold is subjected to solution and aging treatment, hardness and strength of the mold are remarkably improved, and the using requirements of the mold are met.

The invention relates to novel WC-Cr3C2-Ni thermal spraying powder and a preparation process thereof. The WC-Cr3C2-Ni thermal spraying powder consists of the following raw materials in percentage by mass: 73 mass percent of tungsten carbide with two kinds of particle sizes, 19.5 mass percent of chromium carbide, 7 mass percent of nickel, and 0.5 percent of trace titanium carbide served as a grain inhibitor, wherein the tungsten carbide in the raw materials is formed by mixing the following raw materials in percentage by mass: 22 to 51 mass percent of nano tungsten carbide with 0.05 to 0.2 micrometer of particle size and 22 to 51 mass percent of medium-grain tungsten carbide with 2.0 and 8.0 micrometers of particle size in certain proportions. The invention also relates to a corresponding preparation process. According to the WC-Cr3C2-Ni thermal spraying powder and the preparation process, related performance of coatings subjected to the thermal spraying can be improved, and the coatings have high abrasive resistance, high-temperature oxidation resistance and higher toughness.

The invention belongs to the technical field of aluminum alloys, and particularly relates to an aluminum alloy, a method for casting a cast ingot from the aluminum alloy, and a method for extruding a profile from the cast ingot. The invention aims to provide an aluminum alloy which has high strength and favorable processability. The high-strength aluminum alloy provided by the invention comprises the following components in percentage by weight: 0.5-1.5% of Mg, 0.25-1.2% of Si, 0.6-1.2% of Cu, 0.1-0.8% of Mn, 0.01-0.2% of Cr, 0.01-0.15% of Ti and the balance of Al. The yield strength of the hollow profile of the alloy in the T6 state (after completing aging treatment) is up to 350 MPa, the tensile strength is up to 400 MPa, and the plasticity is higher than 10%; and the hollow profile has favorable welding performance and fatigue resistance.

The invention discloses a method for reducing net level of bearing steel wire rod carbide, including the following steps: firstly, bearing steel continuous casting billet is heated and warmed up, and rough rolling, medium rolling and pre-finishing treatments are carried out at the temperature of 1030 to 1130 DEG C, so that the accumulated elongation percentage n1 of rolled pieces is 65 to 120 times; secondly, pre-hydrocooling treatment of rolled pieces is carried out, the cooling speed is controlled in the range of 10 to 40 DEG C per second, and the cooling time is controlled in the range of 0.8 to 2.2 seconds; then 4 to 10 sub-finishing treatments of rolled pieces are carried out, the start-rolling temperature is controlled in the range of 900 to 950 DEG C, and the final-rolling temperature is controlled in the range of 920 to 990 DEG C; then the rolled pieces are in hydrocooling treatment, the cooling speed is controlled in the range of 50 to 350 DEG C per second, the spinning temperature is controlled in the range of 760 to 820 DEG C, and dispersed rolls are manufactured; finally, the dispersed rolls are in air-cooled treatment, the air-cooled speed is controlled in the range of 2 to 10 DEG C per second, the roll collection temperature when the dispersed rolls come out of air-cooled roller way is controlled in the range of 330 to 450 DEG C, and the dispersed rolls are disposed in environmental air and cooled till room temperature. The products produced by using the method have 95% of carbide whose net level is less than or equal to 1.0 in which the average level is 0.95, thereby being capable of increasing abrasion resistance and service life of steel.

The invention relates to a preparation method of a silicon carbide nanowire enhanced C/C-SiC-ZrB2 ceramic-based composite material. A pretreated carbon fiber prefabricating body is thermally treated to obtain a silicon carbide nanowire. The silicon carbide nanowire prepared by a sol-gel carbon-thermal reaction method is evenly distributed at the inner part of a porous carbon/carbon composite material. Subsequently, pyrolytic carbon deposited in an isothermal chemical vapor deposition furnace is coated at the surface of the silicon carbide nanowire, thus the dropping, growing and rupture of the silicon carbide nanowire in the following reaction and infiltration processes are effectively avoided. A ceramic-based composite material carbon fiber, a silicon carbide nanowire and a pyrolytic carbon middle layer after reaction and infiltration are not eroded by a high-temperature metal bath and are well preserved; thus the physical performance of the composite material can be improved. Compared with the C/C-SiC-ZrB2 ceramic-based composite material without adding the silicon carbide nanowire, the bending strength and the fracture toughness property of the silicon carbide nanowire enhanced C/C-SiC-ZrB2 ceramic-based composite material are improved by 26.9-41.3% and 45.2-59.1% respectively.

The invention discloses a nano toughening NdFeB magnetic material and a preparation method of the nano toughening NdFeB magnetic material. The main mechanism is that a nano composite crystal boundary phase is formed on an NdFeB main phase crystal boundary, an H-grade rare earth permanent magnetic material with high coercive force M is prepared without doping any heavy rare earth, and then, a SH-grade rare earth permanent magnetic material is prepared by adding a little heavy rare earth. The nano material is prepared by a plasma arc method, has a grain size of 5-80nm and mainly contains metallic elements, such as Al, Cu, Cr, Co, Fe, Zn and the like, and all kinds of rare earth elements. A NdFeB main phase having a rare earth content of Pr-Nd is prepared by a SC-HD process; after smelting and hydrogen breaking, the product grain size is milled to be about 3.5 microns by an air-current mill, and in the argon protection atmosphere, a nano additive is added in a manner of jetting composite, so the nano additive is uniformly attached to the NdFeB main phase. In the sintering process, the nano powder and the main phase form the crystal boundary, the coercive force of NdFeB is greatly increased, and since the product has uniform crystal components, the machining property is also elevated well, the NdFeB magnetic material can be applied to the wider field. At the same time, the technical process is simple, low-cost and suitable for the batch production.

The invention discloses a metal support half-cell of a solid oxide fuel cell and a preparation method thereof. The half-cell comprises a porous metal supporting layer thick membrane, a porous cermet gradient transition layer film, a porous anode layer and a compact electrolyte layer film from down to up. The porous gradient transition layer composed of a mixed oxide and a oxide with a fluorite structuring can avoid the direct contact of the porous metal supporting layer and the porous anode layer, and the mutual diffusion of Fe/Cr elements in the metal supporting layer and Ni element in the porous anode layer can be reduced under high temperature sintering condition. The mixed oxide is reduced to an alloy under the work condition of the cell; a high anode active material is formed at a side interface of the anode, a high conductivity composite material which takes the alloy as a main phase is formed on the side interface of a metal support body, so that higher conductivity is presented, ohmic resistance is reduced, electrocatalytic activity is not reduced, long-term stability for operation of the cell can be ensured, and good combination of the porous metal supporting layer and the porous anode layer can be simultaneously realized.

The invention relates to a manufacturing method of a valve part, and the method comprises the following steps: forging electroslag remelting ingot billets, cogging, polishing, finishing carrying out flaw detection and blanking; heating the billets to 1140-1160 DEG C, preserving heat again for 90 minutes, and carrying out upsetting, drawing down, upsetting, drawing down, chambering, billet separation, drawing down and rounding forming treatments on the billets; carrying out flaw detection on the obtained billets; and finally, carrying out solution treatment, air cooling stabilized treatment and age-hardening treatment on a sample. Compared with the prior art, the invention has the advantages that the eligibility of the billets is ensured, the risk brought by carrying out normal forging once is lowered, the inner and outer temperature difference of the billets is reduced, scrap caused by unreasonable heating is solved, the phenomena of centre burst and crack of a forging are avoided, the yield is improved, and the eligibility of the obtained forgings is more than 98%.

The invention discloses a weldable fine grain structural steel S355NL/S355NLZ35 steel plate, which comprises the following chemical components by wt%: 0.10-0.18of C, 0.20-0.45 of Si, 1.20-1.45 of Mn, less than or equal to 0.018 of P, less than or equal to 0.005 of S, 0.015-0.050 of Als, 0.010-0.055 of V, 0.005-0.025 of Ti, and the balance Fe and residual elements. The production method consists of: KR molten iron pretreatment, converter smelting, argon blowing treatment, LF (ladle furnace) refining, VD (vacuum degassing) refining, continuous casting, heating, controlled rolling and controlled cooling, stack cooling, and normalizing. According to the invention, content and proportion of C, Mn and Nb alloy elements are adjusted properly, and content of harmful elements in steel like P and S etc. influencing the plasticity and toughness of the steel plate is strictly controlled, and meanwhile, the heating system of steel rolling is strictly controlled. The rolling process employs a mode of lowering finish rolling temperature, speeding up cooling after rolling, and conducting steel plate stacking and slowing cooling after rolling, thus guaranteeing all performance indexes of the weldable fine grain structural steel S355NL/S355NLZ35 steel plate meeting the standard requirements.

The invention relates to an extrusion deformation process of a high-strength magnesium alloy thick plate. The alloy comprises the following components in percentage by weight: 6 to 13 percent of Gd, 2 to 6 percent of Y, 0.3 to 0.8 percent of Zr and the balance of Mg and inevitable impurity elements. When the magnesium alloy is adopted to cast a blank semi-continuously, the extrusion process comprises the following steps of: homogenizing the alloy blank, quickly cooling the alloy blank, peeling off the alloy blank, heating an extrusion die to 340 to 450 DEG C, heating the alloy blank to 350 to 460 DEG C, keeping the temperature for 1 to 3 hours, and extruding the alloy blank on a 1,800T/3,600T horizontal oil hydraulic machine, wherein the extrusion ratio is 11-15.The specifications of the extruded plate include: the thickness is 10 to 35mm; the width is 50 to 80mm; and the length is more than 2,000mm. After extrusion and isothermal aging treatment, the tensile strength of the alloy is more than 460MPa, the yield strength is more than 390MPa and extension rate is more than 3 percent. The demands of the fields, such as transportation or freight tools, communications and electronics, aviation and the like, for the high-strength magnesium alloy can be satisfied; and the application range of the magnesium alloy is widened.

The invention discloses a hot-rolled structural steel ST52 medium-thick plate with the thickness of 15-60mm. The thick plate comprises the following chemical components by weight percent (wt%): 0.10-0.16wt% of C, 0.25-0.45wt% of Si, 1.20-1.50wt% of Mn, less than or equal to 0.017wt% of P, less than or equal to 0.003wt% of S, 0.015-0.055wt% of Als, 0.020-0.040wt% of Nb, 0.010-0.020wt% of Ti and the balance of Fe and residual elements, wherein C equivalent amount [Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15] is less than or equal to 0.41. According to the invention, through KR molten iron pretreatment, converter smelting, argon blowing treatment, LF (ladle furnace) refining, VD (vacuum degassing) refining, continuous casting, heating, controlled rolling and controlled cooling and piling cooling processes and on the basis of ensuring the ST52 components, the contents of harmful elements such as P, S and the like, influencing the plasticity and toughness of the steel plate, in steel are strictly controlled, and simultaneously, the heating system of rolled steel is strictly controlled; and in the rolling process, final rolling temperature, red returning temperature and cooling speed are rigidly controlled, and methods such as steel plate stacking and slow cooling and the like are adopted, the various properties of the ST52 steel plate with the thickness of 15-60mm reach standard requirements.

The invention discloses an electroplastic equal-diameter rolling mill. The electroplastic equal-diameter rolling mill is mainly characterized in that on the basis of a two-high rolling mill, an equal-diameter angular rolling mechanism consisting of a guiding plate and an equal-diameter angle mold and an electroplastic processing mechanism consisting of an electrical pulse interface and a power supply are added. The electroplastic equal-diameter rolling mill disclosed by the invention has the beneficial effects that the necessary preheating and hot-rolling equipment in the conventional equal-diameter angular rolling process is omitted, annealing treatment does not need to be carried out on plates after rolling, the rolling process can be carried out under the normal temperature, so that the procedure and the processing cost are greatly reduced; and continuous rolling also can be carried out, the processing process is simple and high-efficiency, not only can the effect of greatly improving the comprehensive mechanical performance of the plates after conventional equal-diameter angular rolling be obtained, but also the fussy procedure and the heavy equipment in the conventional equal-diameter angular rolling process are greatly simplified. The electroplastic equal-diameter rolling mill is suitable for carrying out rolling and performance improvement on metal materials such as magnesium alloy with low plasticity and difficult rolling and metal materials such as high-temperature alloy and high-strength steel with high strength and difficult deformation.

The invention discloses a preparation method for a high-strength and high-hardness nanocrystalline tungstate-cobalt hard alloy, which is finished by adopting eight process flows of reinforced grinding machining, proportioning, wet-grinding, drying, forming agent doping, granulating, press-forming and pressure-sintering for the conventional raw material, namely, sub-fine WC (tungstate-cobalt) powder; in the method, common sub-fine-grain WC powder having a Fsss (furnace safeguard supervisory system) granularity of 0.6-0.8 mum, and metal Co powder having a granularity of 0.2-0.4 mum; and the granularity and the granularity distribution of the sub-fine WC are changed by the added working procedure of reinforced grinding treatment, so that the advantage granularity of WC in the obtained super-coarse-grain hard alloy achieves 0.2-0.4 mum, and the hard alloy is high in toughness, complete in crystallization, few in defects, small in microstrain, uniform in sub-fine grains, high in microhardness, and greatly improves the wear resistance and impact toughness.

The invention relates to a high strength hot rolled plate and a production process thereof, in particular to a heavy gauge hot rolled steel plate for a roll bending forming high strength steel plate pile and a production process thereof. The invention mainly solves the technical problems of inadequate thickness, and lowcold bending performance and absorbed-in-fracture energy in the prior high strength heavy gauge steel plate. The technical proposal comprises: the heavy gauge hot rolled steel plate for the roll bending forming high strength steel plate pile comprises the following chemical components by weight percentage: 0.08 to 0.15 percent of C, 0.10 to 0.40 percent of Si, 0.30 to 0.90 percent of Mn, 0.020 to 0.040 percent of Nb, 0.010 to 0.030 percent of Ti, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, and the balance being Fe. The microscopic structures can be fine grain ferrites, and pearlitic structures plus a small amount of bainite structures which are dispersed; the grain size level is 11 to 14; and the banded structure level is less than 0.5. The high strength hot rolled plate is mainly used for producing the steel plate pile.