31results about How to "Achieving Diffuse Distribution" patented technology

The invention discloses powder metallurgy high-speed steel and a preparation method thereof. The method is simpler than the existing powder metallurgy high-speed steel preparation method, steps of high-speed steel mother alloy smelting, atomization for making powder and hot isostatic pressing are omitted, great equipment investment is not needed and the production cost of powder metallurgy high-speed steel is reduced. The impurity content of the powder metallurgy high-speed steel prepared by adopting the method provided by the invention is low and the using performance is excellent. The powder metallurgy high-speed steel provided by the invention is prepared through the steps of 1) preparing powder mixture: weighing raw materials according to set components and proportioning ratio, and mixing and ball-milling the raw materials in a roller-type ball mill to obtain the powder mixture; 2) molding: molding the powder mixture into pressed blanks through cold isostatic pressing; 3) sintering: sintering the pressed blanks in a vacuum or inert gas atmosphere by adopting a hot-pressing sintering technology, heating the pressed blanks to 1100-1250 DEG C during sintering, preserving heat for 30-90 minutes and keeping sintering pressure to be 10-40Mpa; 4) hot forging; 5) heat treatment.

The invention discloses a method for optimizing a steel structure by adding nano particles into steel liquid, which belongs to the field of ferrous metallurgy. The method comprises the following steps of: mixing and dispersing nano-powder and pure iron powder, wherein the mass percentage of the nano-powder is 1-40 percent, the mass percentage of the pure iron powder is 60-99 percent, and the average particle size of the nano-powder is 10-5,000 nm; under inert gas, sintering the mixture into a nano-powder stick by a hot-pressing technology, wherein a core material of the nano-powder stick is a steel stick, the outer layer of the nano-powder stick is provided with the mixture, the hot-pressing sintering pressure is 5-40 MPa, the sintering temperature is 1,000-1,400 DEG C, and the heat preservation time is 5-15 minutes; and inserting the nano-powder stick into the steel liquid of a steel ladle or a tundish, wherein the insertion depth of the nano-powder stick is 1/2-2/3 of the total depth of the steel liquid, and the nano-powder stick is driven by a mechanical hydraulic device to vibrate up and down or left and right. By the method, the nano particles can be effectively and uniformly dispersed and distributed in the steel liquid.

The invention relates to a method for compositely refining a solidification structure of a magnesium alloy by combination of current and Zr. A Zr refiner is added in a smelting process of the magnesium alloy and current is introduced in a solidification process of the magnesium alloy till the magnesium alloy is solidified completely. The method provided by the invention comprises the specific steps of: (1) placing an electrode in a cast, and connecting the electrode with a power supply and pre-adjusting current parameters; (2) smelting the magnesium alloy by regular smelting, refining, drossing and peeling steps; (3) adding the Zr refiner till temperature of a mother solution of the magnesium alloy is adjusted to a predetermined temperature, and agitating and standing; and (4) pouring the mother solution of the magnesium alloy to the cast and turning on a power supply switch to introduce current from the beginning of pouring to complete solidication of the cast so as to obtain the refined solidification structure of the magnesium alloy. The method provided by the invention adopts a composite method which combines physical refining with chemical refining, is able to obtain the structure of the magnesium alloy with more smaller grains, more uniform structure and remarkably reduced deficiency, improves the mechanical property of the magnesium alloy, and is suitable for solidification and refining of the magnesium alloy.

The invention relates to a method for adding nano particles into steel, refining a structure and strengthening and toughening steel. The method comprises the following steps that firstly, the nano particles are pre-dispersed, oxide nano particles and pure metal nano powder are weighed and are mixed, and a mixture is subjected to pre-dispersing in a planetary ball grinder under the vacuum and liquid nitrogen cooling condition to obtain mixed nano powder; secondly, an aluminum-based intermediate is prepared, a medium-frequency induction furnace is adopted for heating and melting metal aluminum,the mixed nano powder is added, and under the joint effect of a spiral electromagnetic field and ultrasonic waves, the mixed nano powder is dispersed in the molten aluminum to obtain the aluminum-based intermediate; and thirdly, the nano particles are added, in the deoxidized alloying process in the RH refining later period, silicon, manganese, aluminum or alloy of silicon, manganese and aluminumis adopted for deoxidizing the molten steel, the aluminum-based intermediate is added, and in the continuous casting production process, a continuous casting blank with the nano particles evenly distributed is prepared. Aluminum alloying is achieved, and after aluminum dissolving, the nano particles are released to be dispersed in the molten steel.

The invention discloses a preparing method for load magnetic metal sepiolite composite powder or fiber. The method includes the steps that sepiolite powder or sepiolite fiber is fired or placed in a silane coupling agent to be soaked, and pretreated sepiolite powder or sepiolite fiber is obtained; and the pretreated sepiolite powder or sepiolite fiber is mixed with a magnetic metal organic matter solution, then the mixture is sealed in a reaction kettle to be subjected to a pyrolytic reaction, and the load magnetic metal sepiolite composite powder or fiber is obtained. Magnetic metal in the prepared composite material is evenly distributed in the surface or pores of sepiolite, the magnetic metal load is high, and the electromagnetic matching performance of the material can be adjusted according to the load and the metal ratio. The preparing method is simple in technology and low in cost, and large-scale production is facilitated.

The invention discloses a method for performing thermal treatment on zirconium alloy. The method comprises the following steps of: firstly, quenching a zirconium alloy blank to obtain a quenched blank; secondly, cooling the quenched blank to room temperature, and deforming the quenched blank until the deformation degree is 5 to 30 percent, namely pre-deforming the quenched blank at room temperature to obtain a pre-deformed blank; heating the pre-deformed blank to 350 to 700 DEG C, and annealing for 0.2 to 30 hours for the first time; thirdly, performing hot-rolling on the pre-deformed blank; fourthly, annealing repeatedly, and performing cold machining to obtain a plate; and finally, re-crystallizing and annealing the plate to obtain the finished product plate. Compared with the traditional method for performing thermal treatment on the zirconium alloy, the method for performing thermal zirconium alloy fulfils the aim of distributing second phase particles of the zirconium alloy in a dispersing way and improving the size uniformity of crystal particles of the zirconium alloy.

The invention discloses a modified high-efficiency crystalline silicon solar cell comprising a crystalline silicon substrate. The front side and back side of the crystalline silicon substrate are respectively printed with an environment-friendly conductive silver paste and a high-performance crystalline silicon solar back-field aluminum slurry by means of silk-screen printing; and then drying andsintering are carried out to form a silver grid line electrode and an aluminum back field. Compared with the prior art, the modified high-efficiency crystalline silicon solar cell has the following beneficial effects: the environment-friendly conductive silver paste uses ultra-fine silver oxide and micron silver powder for compounding, so that the resistivity is reduced; the micron silver powder has the large tap density and high sintering activity; for the high-performance back-field aluminum slurry, several kinds of aluminum powder and metal magnesium powder with different average grain sizes are used for compounding, so that the contact between the aluminum paste and the suede-like silicon wafer is improved; the wettability and interface bonding force with the aluminum liquid are enhanced by using the improved carbon nano tube; the short-circuit current and open-circuit voltage are increased; the laminated passivation film is deposited on the back side of the silicon wafer based onthe traditional process, so that the good passivation effect is realized; and the suede and the anti-reflection film are prepared on the front side of the silicon wafer, so that the solar light absorption is prompted.

The invention discloses a photovoltaic panel with a dual circulation cooling function. The photovoltaic panel comprises a mounting base and a plurality of solar cell pieces, and strip-shaped water collecting grooves are vertically formed in the mounting base oppositely; a liquid cooling unit and a gas cooling unit are arranged in the mounting base; the solar cell pieces, the liquid cooling unit and the gas cooling unit are sequentially connected from top to bottom, and the two strip-shaped water collecting grooves are communicated with the liquid cooling unit separately; the flow direction ofa medium in the liquid cooling unit and the flowing direction of a medium in the gas cooling unit are perpendicular to each other, and a turnover assembly is arranged below the mounting base. Comparedwith the prior art, the photovoltaic panel is compact in structure, rainwater circulation cooling and the cool air circulation cooling are efficiently combined, the temperature of a solar cell backboard is effectively reduced, and the cooling efficiency is integrally improved, so that the power generation efficiency of a solar cell panel is improved, and the service life of the solar cell panel is prolonged; the resistance of series connection cells of the solar cell pieces is low, the photoelectric conversion efficiency is high, the surface is flat and smooth, the adhesive force is good, thewarping curvature is low, and application prospects are wide.

The invention discloses a solar energy collection device with a rapid heat dissipation function. The solar energy collection device comprises a mounting base and a plurality of solar cells, wherein each solar cell comprises a silicon wafer printed with back field aluminum paste; strip collecting chutes are oppositely and vertically formed in the mounting base; a liquid heat dissipation unit and agas heat dissipation unit are arranged in the mounting base; the solar cells, the liquid heat dissipation unit and the gas heat dissipation unit are sequentially connected from top to bottom; two strip collecting chutes communicate with the liquid heat dissipation unit separately; and the flow direction of medium in the liquid heat dissipation unit is vertical to that in the gas heat dissipation unit. Compared with the prior art, the solar energy collection device has the advantages that the structure is compact; rainwater circuiting heat dissipation is efficiently combined with cooling air circulating heat dissipation, so that the temperature of a solar cell backboard is effectively reduced and the heat dissipation efficiency is improved on the whole, thereby improving the power generation efficiency of a solar cell panel and prolonging the service life of the solar cell panel; the solar cells are low in cell series resistance, high in photoelectric conversion efficiency, flat and smooth in surfaces, good in adhesive force and low in warp rate; and the solar energy collection device has a broad application prospect.