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

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 discloses a rotatablely cleaned photovoltaic power generation device. The device comprises an installation seat. Multiple solar cell sheets are installed on the installation seat. Each solar cell sheet comprises a silicon sheet printed with back field aluminum slurry. A main rotary shaft and at least one auxiliary rotary shaft are vertically arranged in the installation seat in a penetrating manner. The upper ends of the main rotary shaft and the auxiliary rotation shafts stretch out of the installation seat and are horizontally connected with a cleaning strip brush. The lower ends of the main rotary shaft and the auxiliary rotation shafts are connected with an elevating rotation adjustment assembly. Compared with the prior art, the device is compact in structure; by highly efficiently combining the elevating driving and the rotary driving, all-directional cleaning of the surface of a solar cell plate and storage of cleaning tools can be stably and reliably achieved; complexity of the device is reduced; and a flexible scraping sheet on the cleaning strip brush rotates along with the shaft, so a cleaning process is automatically finished. Thus, cost is reduced; energyconversion efficiency is improved; the serial connection resistance of cells of the solar cell sheets is low; the photoelectric conversion efficiency is high; the surface is flat and smooth; the adhesive force is good; the bending rate is low; and the device has excellent application prospects.

The invention discloses a cold-rolled enamel steel for deep-drawing inner tanks, which contains the following chemical elements in the following mass percentages: C: 0.02-0.06%, 0<Si≤0.08%, Mn: 0.1-0.7%, P≤ 0.055%, S≤0.03%, Al: 0.01‑0.07%, N: 0.002‑0.010%, B: 0.002‑0.009%, Ti: 0.002‑0.015%, Nb: 0.002‑0.012%, Cr: 0.01‑0.08%, And at least one of Cu, Ni and Mo, wherein Cu+Ni+Mo≤0.40%. In addition, the invention also discloses a method for manufacturing cold-rolled enamelled steel for deep-drawing inner tanks, which includes the steps of: (1) smelting, refining and continuous casting (2) slab heating (3) hot rolling and coiling (4) ) pickling (5) cold rolling: controlled cold rolling reduction rate 60-70% (6) continuous annealing: soaking temperature 800-830°C, soaking time 100-150s, overaging temperature 350-450 ℃, the overaging time is 250‑350s (7) flat. The cold-rolled enamelled steel for deep-drawing liner of the present invention adopts reasonable chemical composition and process design, and has good formability, high strength after high-temperature enamelling, excellent welding performance and excellent anti-scaling performance.

The invention provides a high-strength heat-resistant graphene-aluminum composite conductor material and a preparation method thereof. The composite conductor material is composed of the following components in mass percentage: graphene is 0.2-1%, and the rest is aluminum; powder and graphene powder are evenly mixed, and the weak oxygen content in the ball mill tank is used in the ball milling process to obtain uniform nano-scale amorphous Al on the surface of the aluminum powder 2 o 3 , and then the mixed powder is sintered to obtain a billet, and further deformed by extrusion or rolling to obtain a dense composite material. The present invention uses air as an oxygen source to react in situ to form dispersed amorphous Al 2 o 3 , effectively realized the dispersed distribution of nano-scale strengthening phase, combined with the thermal stability of high-strength and high-conductivity graphene, the composite material has good mechanical properties and heat resistance, and maintains good electrical conductivity. The tensile strength is greater than 250MPa, The highest reaches 328MPa.

The invention relates to a uniformly dispersed aluminum-based intermediate of nanoparticles, which comprises uniformly dispersed oxide nanoparticles with a volume fraction of 10% to 20%, the particle size of the oxide nanoparticles is between 25nm and 50nm, and the oxide nanoparticles are CaO nanopowder, MgO nanopowder and Al 2 o 3 One of the nano powders, the rest is Al. The invention combines the ultrasonic dispersion technology and the spiral electromagnetic stirring technology to uniformly disperse the nanoparticles into the aluminum liquid to prepare an aluminum-based intermediate, so as to solve the agglomeration of the nanoparticles. The process is simple and the cost is low, and the dispersed distribution of nanoparticles in the aluminum matrix is ​​realized. In the process of steelmaking, aluminum-based intermediates are used to participate in the final deoxidation, and nanoparticles are added to molten steel to increase the nucleation core of finely dispersed foreign solids, which serve as the precipitation core of nascent alumina inclusions, disperse the quality of inclusions, and reduce inclusions Size, refine aluminum oxide inclusions in molten steel, and eliminate the damage of inclusions to steel performance. Improve the mechanical properties and surface quality of steel.

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 relates to a method for adding nanoparticles to steel and its refined structure and strengthening and toughening steel, comprising the following steps: (1) pre-dispersing nanoparticles, weighing oxide nanoparticles and pure metal nanopowder, and or mixed, and pre-dispersed in a planetary ball mill under vacuum and liquid nitrogen cooling conditions to obtain a mixed nano-powder; (2) prepare an aluminum-based intermediate, use a medium-frequency induction furnace to heat and melt metal aluminum, add a mixed nano-powder, in a spiral electromagnetic field and Under the joint action of ultrasonic waves, disperse and mix nano-powders into molten aluminum to obtain aluminum-based intermediates; (3) Add nanoparticles. During the deoxidation alloying process in the later stage of RH refining, silicon, manganese, aluminum or their alloys are first used to react with molten steel Deoxidation is carried out, and then aluminum-based intermediates are added. During the continuous casting production process, continuous casting slabs with uniform distribution of nanoparticles are prepared. The invention realizes the aluminum alloying, and releases nano particles to disperse into the molten steel after the aluminum is dissolved.

The invention relates to a SiC / M2 powder high-speed steel composite material. The composite material has a relative density of greater than 99% and hardness of 66-69HRC, and comprises nano-scale enhanced-phase particles SiC, submicron-scale hard-phase SiC and separated submicron-scale M6C type composite carbide, wherein the average particle size of the enhanced-phase particles SiC is 200nm, and the particle sizes of the hard-phase SiC and the M6C type composite carbide are not greater than 1[mu]m; and the matrix of the composite material is M2 high-speed steel, the particles SiC are uniformly distributed into the matrix in a dispersed manner as additional mass points, the composite material comprises the following raw material components with contents by volume percent: 85%-90% of M2 high-speed steel and 10%-15% of the particles SiC, the volume fraction of the particles SiC with particle sizes of not greater than 200nm in the particles SiC is 10%-20%, and the balance is particles with particle sizes of greater than 200nm and less than 1[mu]m. A preparation technology for a pre-alloyed composite powder is beneficial to obtaining the composite powder with a small and uniform particle size, preventing the agglomeration of the powder SiC, and realizing adequate alloying for the particles SiC and the matrix powder.

The invention discloses a WC-Co (Wolfram Carbide-Cobalt) hard alloy with Ta / Nb (Tantalum / Niobium) solid solutions dispersedly distributed and a preparation method thereof. The WC-Co hard alloy comprises a WC hard phase, a metal Co binder phase and a Ta / Nb solid solution phase, wherein the mass fraction of the metal Co binder phase is a more than or equal to 3% and less than or equal to 15%; the Ta / Nb solid solution phase comprises at least one of a TaC (Tantalum Carbide ) solid solution, an NbC (Niobium Carbide) solid solution or a (Ta, Nb)C solid solution, and (mTa+mNb) / mCo is more than or equal to 0.004 and less than or equal to 0.083; and Ta / Nb solid solutions are dispersedly distributed in a point shape in the WC-Co hard alloy. The preparation method of the WC-Co hard alloy comprises the following steps of: preparing a semi-finished product; and carrying out sintering temperature rise, sintering heat preservation and sintering cooling on the semi-finished product. The WC-Co hard alloy disclosed by the invention realizes the dispersed distribution of the TaC, NbC or (Ta, Nb) C solid solutions on the basis without changing alloy components, thereby enhancing the alloy structure uniformity and the alloy property.

The invention discloses a copper-based coating for iron-based alloy surface laser cladding and a preparation method thereof, belonging to the technical field of material surface modification. The 0.4-2 mass percent of nano oxides such as CeO2, Al2O3, Sm2O3 and Y2O3 are added into pure copper powder, so that the problems that the cladding quality is low, the binding property with the iron-based alloy is poor when a pure copper coating is subjected to laser cladding on the surface of the iron-based alloy and the like are solved. In addition, cladding is performed by adopting extremely high laser scanning speed of 600-1000mm per minute, the problem that the additional nano-particles are easily aggregated in the coating coagulation process is solved, and uniform distribution of the nano-particles in the copper coating is realized. Meanwhile, according to the high surface effect and heterogeneous nucleation effect of the nano oxides, the coagulation tissues at the coating interface can be refined by 10 times or more. Compared with a laser cladding pure copper coating, the copper-based coating prepared by the invention has high cladding quality, the hardness is improved by nearly 40 percent, and the conductivity reaches 82% IACS (International Annealed )soft) Copper Standard).

The invention discloses a high-strength and high-conductivity graphene-copper composite wire and a preparation method thereof, which belong to the technical field of composite material processing and heat treatment. In the graphene-copper composite wire, the graphene content is 0.05-0.8wt.%, the total content of impurity elements is ≤0.1wt.%, and the balance is copper. The high-strength and high-conductivity graphene-copper composite wire prepared by the present invention has uniform graphene Dispersed and oriented distributed in the copper matrix, its tensile strength reaches 330-480MPa, elongation 6%-20%, electrical conductivity 95-105% IACS, and has excellent comprehensive performance.

A non-Co multi-element high-speed tool steel contains proportionally C, Si, Mn, S, P, Cr, V, Mo, W, Ni, Nb, Ti, Mg, RE and Fe. Its preparing process includes such steps as smelting by MF furnace, modifying with Y-based RE alloy, centrifugal casting, and heat treating.