18results about How to "Refine grain size" patented technology

The invention belongs to the technical field of target materials, and particularly discloses a silver alloy target material and a preparation method and application thereof. The silver alloy target material comprises the following raw material components in percentage by weight: 99.25 to 99.93 percent of Ag, 0.05 to 0.55 percent of Ce, 0.01 to 0.05 percent of aluminum-copper alloy and 0.01 to 0.15 percent of manganese-copper alloy. On one hand, a certain amount of Ce, Al-Cu alloy and Mn-Cu alloy are added into Ag for microalloying; and on the other hand, the microstructure form is regulated and controlled in combination with forging and hot rolling treatment in the manufacturing process. And finally, on the premise that the reflectivity is not reduced, the vulcanization resistance and the oxidation resistance are greatly improved, the silver alloy target material has high hardness and is easy to process, the time for starting blackening vulcanization of the silver alloy target material is 8.0-11.2 hours, the time for starting blackening oxidation of the silver alloy target material is 7.5-10.6 hours, and the Vickers hardness of the silver alloy target material is 97-138.

The present invention relates to a 690MPa grade low temperature corrosion resistant steel for frozen soil roads, which belongs to the technical field of corrosion resistant steel and solves the problem that high strength steel in the prior art cannot meet the low cost and high performance requirements of high strength frozen soil road steel. The low temperature corrosion resistant steel comprises: C: 0.05-0.12%, Si: 0.30-0.50%, Mn: 1.50-1.80%, P: 0.002-0.02%, S: ≤0.005%, Cu: 0.05-0.55%, Cr: 0.1-0.8%, Ni: 0.5-3.0%, V: 0.02-0.08%, Nb: 0.010-0.02%, N: 0.003-0.020%, Al≥0.015%, La+Ce≤0.05%, and the balance is Fe and unavoidable impurities. The 690MPa grade low temperature corrosion resistant steel for frozen soil roads of the present invention is suitable for high strength frozen soil road steel.

This invention provides an ultra-high strength, low density Al-Mg-Zn-Sc-Zr-based alloy and its preparation method, belonging to the field of aluminum alloy material technology. The ultra-high strength, low density Al-Mg-Zn-Sc-Zr-based alloy provided by this invention, by mass fraction, has the following chemical composition: Mg 3.0~8.0%, Zn 1.0~5.0%, Cu 0.4~1.0%, Mn 0.1~0.8%, Ag 0.05~0.3%, Sc 0.01%~0.3%, Zr 0.05~0.3%, with the balance being Al. This invention achieves this by precisely controlling the elemental ratios of Mg, Zn, Cu, and Ag, resulting in an alloy that maintains its low density while exhibiting a strong age-hardening effect. Simultaneously, the reasonable addition of trace elements such as Mn, Sc, and Zr enables the alloy to possess a dispersion strengthening effect. Combined with heat treatment and hot deformation processes, this further improves the strength and ductility of the aluminum alloy.

The application discloses a kind of corrosion-resistant high-strength magnesium alloy material and preparation method thereof, it is related to magnesium alloy material technical field, by the following chemical components: Al, Zn, Mn, Y, Ce, Ca, Zr, Sb, Sr, Ta, In, Mg and other inevitable impurities.It is prepared using vacuum induction melting, ternary compound refining agent impurity removal, high-pressure die casting forming, vacuum fine-grain heat treatment, then through phytic acid-potassium permanganate-cerium nitrate-ammonium metavanadate composite passivation treatment.Ta, In, Sb, Sr cooperates to refine grain, weakens micro-electrochemical corrosion, nanometer fluorine carbon cerium ore refining agent purifies melt, and cerium-vanadium compound passivation film is dense and stable.The obtained material has high tensile strength and excellent corrosion resistance.

The invention relates to the technical field of aluminum foil processing, in particular to a method for eliminating stripes on the surface of 3003 cathode foil, which comprises the following steps of: 1, adding a cold material into electrolytic aluminum water for smelting to obtain an aluminum alloy melt; 2, refining and slagging-off are conducted; step 3, turning down and refining in a holding furnace; step 4, filtering and degassing; 5, cast rolling is conducted; sixthly, primary cold rolling and edge cutting are conducted; seventhly, secondary cold rolling is conducted; step 8, annealing; and ninthly, the annealed blank is subjected to foil rolling and slitting in sequence, and a finished product with the thickness being 0.02-0.03 mm is obtained. According to the method, the components, the proportion, the production process and parameters of the aluminum alloy melt are regulated and controlled, and surface stripes of the aluminum alloy finished product are eliminated on the premise that the mechanical performance and the specific volume of the aluminum alloy finished product are not reduced.

The invention discloses a method for manufacturing a Cu-Cr-Nb-RE material guide rail for an electromagnetic rail gun, comprising the following steps: S1, preparing a blank, including material vacuum induction melting, vacuum electrode gas atomization powder making, and hot isostatic pressing; S2, forging; S3, primary annealing; S4, rough rolling; S5, secondary annealing; S6, intermediate rolling; S7, machining; Cr and Nb in the Cu-Cr-Nb-RE material manufactured by the invention form a large amount of Cr2Nb strengthening phase, which is evenly dispersed in the alloy, can refine and control the grain size of copper, and the Cr2Nb phase is still stable when it exceeds 1600°C, avoiding the problems of fatigue and ablation of the hot end part of the material at high temperature. The Cu-Cr-Nb-RE material guide rail manufactured by the method of the invention not only has high strength and high electrical conductivity, but also has a high softening temperature and a comprehensive performance of high temperature ablation resistance, which significantly improves a series of problems existing in the current guide rail.

This invention discloses a method for preparing low-melting-point target materials. First, the original ingot is subjected to extrusion treatment. This invention combines extrusion treatment and high-temperature compression treatment. After sawing the target material billet, it is heated at high temperature and compressed downward by the pressure head of a hydraulic press to obtain the target material billet. This invention first obtains a dense structure through extrusion treatment, and at the same time obtains the accumulation of deformation, which provides a basis for subsequent compression and grain refinement. Through the subsequent high-temperature compression treatment, the deformation amount of the target material billet reaches more than 70% in 10-40s, so that the target material billet has a rapid and large deformation compression deformation process at high temperature, and the target material billet has a dynamic recrystallization process during deformation.

The invention provides an active metal material surface functional coating and an additive and subtractive precise preparation method thereof, and the preparation method comprises the following steps: S1, selecting micron powder with the particle size of 20-75 [mu] m and nano particles with the particle size of 10-500 nm, uniformly mixing, and carrying out vacuum drying for later use; s2, processing a microstructure on the surface of the substrate by adopting ultrafast laser; the power of the ultrafast laser is 10-60 W, the pulse frequency is 5-50 kHz, and the walking speed is 100-500 cm / s; s3, the mixed powder obtained in the step S1 is laid on the surface of the substrate obtained in the step S2, the mixed powder is evenly laid in a microstructure filling mode, and SLM continuous laser is adopted for forming; the SLM continuous laser power ranges from 50 W to 150 W, the scanning speed ranges from 100 mm / s to 800 mm / s, and the scanning interval ranges from 0.03 mm to 0.05 mm; and S4, the step S2 and the step S3 are repeated till the needed coating thickness is formed, and the active metal material surface functional coating is obtained. According to the preparation method, the wear resistance, corrosion resistance and other performance of the active metal surface are remarkably improved, meanwhile, expression of functionality such as the antibacterial performance can be achieved, and the application requirements of the active metal surface in the fields of high-end medical treatment and the like are met.

This invention provides a high-flatness copper-nickel-tin-zinc alloy and its preparation method, belonging to the field of copper alloy manufacturing technology. The high-flatness copper-nickel-tin-zinc alloy provided by this invention, by mass percentage, comprises the following chemical composition: Ni: 0.2-3.0%, Sn: 0.2-2.0%, Zn: 0.05-0.2%, Fe: 0.01-0.1%, P: 0.02-0.08%, Nb: 0.05-0.28%, Ta: 0.05-0.2%, La: 0.02-0.1%, and the balance Cu. The results of the examples show that the copper-nickel-tin-zinc alloy of this invention has a tensile strength >600 MPa and an elongation A... 11.3 The heat shrinkage rate is 5-7%, the hardness is >180HV, the conductivity is ≥40%IACS, the bending rate is 7-8mm / m, the flatness is ≤0.05mm, and the heat shrinkage rate is ≤0.006%.

The invention discloses an aluminum alloy profile for a new energy automobile, and belongs to the technical field of new energy materials. The aluminum alloy profile comprises the following components in percentage by mass: 0.14%-0.19% of Fe, 0.58%-0.66% of Si, 0.6%-1.3% of Mg, 0.25%-0.35% of Cu, 0.07%-0.15% of Mn, 0.14%-0.22% of Cr, 0.01%-0.05% of Zn, 0.03%-0.15% of Ti, 0.6%-0.9% of composite rare earth metal elements and the balance of Al and impurities, and the total content of the impurities is not greater than 0.25%. According to the method, the aluminum alloy profile is optimized from the two aspects of element composition and surface treatment, rare earth metal elements La, Pr and Gd with different atomic radiuses and qualitative change capacities are added, grains of the aluminum alloy are effectively refined, a surface treating agent is sprayed subsequently, and the mechanical property and corrosion resistance of the aluminum alloy profile are effectively improved.

This invention discloses a perovskite thin film, a perovskite device, and a preparation method thereof. The preparation method of the perovskite thin film includes: coating a perovskite precursor solution onto a substrate to form a liquid film; removing at least a portion of the solvent from the liquid film using a vacuum process to form an intermediate phase film; and performing an annealing treatment to form the perovskite thin film; wherein the perovskite precursor solution contains an excess of A-site cations. The preparation method provided by this invention effectively compensates for the loss of A-site cations during the vacuum process, inhibits the formation of residual B-site cation salts, reduces device voltage loss, increases the grain size of the perovskite thin film, improves carrier transport and extraction, and increases the short-circuit current of the device; it is simple and easy to implement, low in cost, and requires no additional steps, making it suitable for the preparation of large-area perovskite thin films; it reduces the number of steps in perovskite device preparation, lowers material costs, and facilitates industrial development.

The application provides a high-toughness ferrite-pearlite type non-quenched and tempered steel and a manufacturing method thereof, and the composition of the steel is as follows: C 0.35-0.42%, Si 0.35-0.45%, Mn 1.25-1.65%, P ≤0.010%, S 0.025-0.050%, Cr 0.10-0.30%, Nb 0.02-0.05%, Mo 0.010-0.050%, Ni 0.10-0.25%, Al 0.025-0.045%, V 0.10-0.30%, Cu ≤0.10%, Ti 0.010-0.040%, [N] 120-160ppm, [H] ≤1.0ppm, T.O ≤10ppm; the rest is Fe and inevitable impurity elements; the steel is combined with a controlled rolling and controlled cooling process, the ferrite content is increased, the strength and toughness are improved, the strength and toughness are matched, and the cutting performance is improved.

This invention discloses a strontium titanate ceramic material, a grain boundary layer ceramic substrate, its preparation method, and its application. The invention involves mixing SrTiO3 powder with dopants, sintering, grinding, and sieving to obtain raw material A. The dopants are one or more selected from Nb2O5 powder, La2O3 powder, MgO powder, and Nd2O3 powder. SrTiO3 powder and glass powder are mixed, sintered, ground, and sieved to obtain raw material B. Raw material A, raw material B, an adhesive, and an organic solvent are mixed and molded to obtain a film. The film is then subjected to debinding and reduction sintering to obtain the strontium titanate ceramic material. The strontium titanate ceramic material of this invention possesses advantages such as increased grain size, uniform growth, and stable electrical properties, making it suitable for manufacturing high-performance ceramic capacitors and demonstrating broad application potential in the field of electronic components.

A method for preparing TiB2 particle-reinforced aluminum matrix composites using lanthanum hexaboride (LaB6) and an aluminum-titanium (Al / Ti) alloy is disclosed, relating to the field of high-strength and high-toughness aluminum matrix composite preparation technology. Employing a dual-melt mixing method, the method uses lanthanum hexaboride (LaB6) and an Al / Ti alloy as the source of TiB2. During the melting process, the fine TiB2 particles generated in situ are uniformly distributed within the alloy matrix, providing dispersion reinforcement and improving the strength and toughness of the alloy material. This invention avoids introducing impurity phases such as Al3Ti found in composite fluoride salt preparation processes. The innovative introduction of La through the dual-melt mixing method refines the grain size of the aluminum alloy matrix, allowing for a more uniform and dispersed distribution of the in-situ prepared TiB2 particles within the alloy matrix, thus improving the mechanical properties of the aluminum alloy material. This method can be widely applied in fields requiring lightweight and high-toughness materials, such as new energy vehicles and aerospace.

The invention belongs to the technical field of perovskite solar cells, and provides a perovskite thin film based on a volatile additive and a preparation method and application thereof. According to the perovskite thin film provided by the invention, the perovskite matrix and the volatile additive are used as main raw material components, and the volatile additive comprises at least one of a beta-diketone compound, a carboxylic acid compound, an amide compound and a nitrogen-containing heterocyclic compound. The volatile additive promotes crystallization of perovskite in a large-grain and highly preferred orientation mode, crystal growth can be effectively regulated and controlled in the annealing process, bulk phase or surface defect passivation is achieved, interface performance is optimized, and finally the high-quality perovskite thin film with larger grain size and remarkably reduced grain boundaries is successfully prepared. And the volatile additive does not remain in the film after volatilization. The perovskite thin film provided by the invention can be used for preparing a perovskite solar cell device.

The application discloses a kind of wide band gap perovskite light-absorbing layer containing pyridinium iodide, solar cell and preparation method thereof, the light-absorbing layer is by doping 0.1-5 mg / ml concentration trans-4-{4-(dimethylamino) styryl}-1-methylpyridinium iodide in perovskite precursor solution, and then the perovskite light-absorbing layer containing pyridinium iodide is prepared.The preparation method of the application is by introducing trans-4-{4-(dimethylamino) styryl}-1-methylpyridinium iodide additive in perovskite light-absorbing layer bulk phase, slows down the difference problem of bromide and iodide crystallization rate in perovskite film forming process, promotes the uniform distribution of each element, and effectively inhibits the phase separation phenomenon of iodine ion and bromine ion, so as to improve the quality of perovskite film, so that perovskite film has good thermal stability, after heating at 85 DEG C for 1000 hours, the efficiency still remains 90% of initial value.

The present invention belongs to the field of metal micro-additive manufacturing, and relates to a low-temperature constrained electrodeposition micro-additive manufacturing system and method, which is mainly for improving the localization of metal deposition in micro-regions. The present invention is characterized in that a cooling tube (9) is arranged in the electrodeposition micro-groove (7), so that the set temperature of the coolant in the cooling tube is ‑2°C to 5°C, and the set temperature is higher than the freezing point temperature of the metal ion aqueous solution (2) and the water-based conductive solution (5). The movement rate of metal ions is slowed down by low temperature, and the expansion range of the electrolyte micro-region in the water-based conductive solution is constrained, which effectively reduces stray deposition and improves the localization of electrolyte micro-region electrodeposition. At the same time, electrodeposition in a low-temperature solution environment can change the metal ion deposition nucleation mechanism and growth characteristics, refine the deposited metal grains, and improve the surface quality of the microstructure.

The invention discloses a preparation method of a low-melting-point target material, which comprises the following steps: firstly carrying out extrusion treatment on an original cast ingot, combining the extrusion treatment with high-temperature compression treatment, sawing a target material blank, then carrying out high-temperature heating on the target material blank, and carrying out downward compression through a pressure head of a hydraulic machine to obtain the target material blank. And meanwhile, accumulation of deformation quantity is obtained, a basis is provided for subsequent compression and grain refinement, the deformation quantity of the target material blank reaches 70% or above within 10-40 s through subsequent high-temperature compression treatment, the target material blank has the rapid large-deformation-quantity compression deformation change process at the high temperature, and the target material blank has the dynamic recrystallization process in the deformation process.