13results about How to "Uniform precipitation" patented technology

This invention discloses a free-machining high-strength aluminum-lithium alloy, its preparation method, and its applications, belonging to the field of alloy materials technology. The free-machining high-strength aluminum-lithium alloy has the following weight percentages of elements: Li: 3.5–5.5%, Cu: 2.6–3.1%, Zn: 6.8–7.1%, Mg: 2.1–3.0%, Y: 1.5–4.0%, Bi: 0.85–1.05%, In: 0.05–0.08%, Cr: 0.05–0.45%, Ti: 0.02–0.04%, with the balance being Al. This invention involves batching, smelting, refining, online refining, online degassing and filtration, casting, homogenization, extrusion, and two-stage aging treatment to finally obtain a free-machining high-strength aluminum-lithium alloy with a uniform microstructure. This invention has a reasonable component ratio, low manufacturing cost, and the resulting product has excellent strength and hardness, and exhibits excellent surface finish after dry machining.

The invention discloses an aluminum beryllium enhanced high-conductivity heat-resistant aluminum alloy material and a preparation method thereof, and belongs to the technical field of metallurgical wire rod processing. The aluminum beryllium enhanced high-conductivity heat-resistant aluminum alloy material is prepared from the following components in percentage by weight: 0.12 to 0.16 percent of Si, 0.15 to 0.35 percent of Fe, 0.005 to 0.10 percent of Cu, 0.35 to 0.85 percent of Zr, 0.2 to 0.45 percent of Y, 0.15 to 0.35 percent of Er, 0.005 to 0.03 percent of B, 0.001 to 0.02 percent of Ti, 0.03 to 0.05 percent of Be, less than or equal to 0.5 percent of other impurities and the balance of Al. According to the aluminum alloy single wire, the specific raw material composition is adopted, namely, multiple elements such as Zr, Y, Er and Be are compositely added, and the proportion of the elements is strictly controlled, so that the prepared aluminum alloy single wire achieves synergistic improvement of high strength, high conductivity and excellent heat resistance.

This invention relates to a crystallization apparatus for preparing lithium hexafluorophosphate, comprising: a tank body, a feeding device provided on the top surface of the tank body, and an array of heat exchange components provided on the inner wall of the tank body. The heat exchange components include several heat exchange plates disposed on the inner wall of the tank body and arranged along the length of the tank body. This apparatus can increase the heat exchange area and enhance the heat exchange efficiency, enabling the uniform and rapid precipitation of lithium hexafluorophosphate crystals, and achieving continuous production with simultaneous crystallization and scale prevention.

The present application relates to a short process forging method of Ti1100 alloy bar, which is used to solve at least one of the problems of long time, low production efficiency, poor mechanical properties, poor process stability, poor consistency of different batches, high cost and the like in the prior art forging method. The forging method controls the heating times of blooming forging and trans-phase zone forging, and cooperates with gradient air cooling treatment. Specifically, in the organization control, the conventional multi-heating-time beta phase zone upsetting and drawing forging is abandoned, the single-heating-time beta phase zone precise temperature control and dynamic deformation regulation are adopted, the excessive growth of beta grains is avoided, and the needle-like alpha phase lamellar aggregation or equiaxed alpha phase abnormal precipitation is prevented by combining with gradient air cooling, so as to ensure the uniformity of the organization, solve the problems of mechanical property fluctuation exceeding the index and low service reliability.

This invention discloses a catalyst for the production of ethylene and propylene, its preparation method, and its applications. The catalyst comprises the following components: I) 1%–10% of chemical formula A x B y D z A compound of O4; in the chemical formula, the oxidation states of elements A, B, and D are m, n, and p, respectively, satisfying x·m + y·n + z·p = 8, where m, n, and p are integers not greater than 3; the A x B y D z O4 has a spinel structure; II) 0.5%–10% is selected from at least one oxide of rare earth elements, P, Mo, and W; III) 20.0%–55.0% is selected from at least one zeolite of ZSM-5 and ZSM-11; IV) 10%–30% is a binder; V) 25.0%–60.0% is clay. This catalyst is used in the catalytic cracking of petroleum hydrocarbons to produce ethylene and propylene, and features good catalyst stability, low methane yield, and high ethylene and propylene yields.

This invention relates to the field of high-temperature alloy technology, specifically to a notch-free GH4141 high-temperature alloy forging bar and its preparation method. In the microstructure of this GH4141 high-temperature alloy forging bar, M6C carbides are distributed in spherical granular form at the grain boundaries; the forging bar exhibits a high-temperature notch creep rupture time ≥40h under 732℃ temperature and 603MPa stress conditions, and the fracture locations are all located in the smooth segment.

The application discloses a low-cost high-strength aluminum-lithium alloy for a space cabin body and a preparation method thereof, and belongs to the technical field of aluminum-lithium alloys.The aluminum-lithium alloy comprises the following components in mass fraction: 91.5-94.5 parts of aluminum, 3.9-4.2 parts of copper, 1.0-1.5 parts of lithium, 0.2-1.0 parts of magnesium, 0.2-0.4 parts of silver, 0.3-0.8 parts of zinc, 0.10-0.12 parts of zirconium and 0.15-0.25 parts of mixed rare earth; the mixed rare earth is a mixed rare earth of cerium and lanthanum, and the mass ratio of cerium to lanthanum is (1.5-2.5):1; the total mass of metal impurities in the aluminum-lithium alloy is not more than 0.15 parts, and the single metal impurity is not more than 0.05 parts; through multi-component micro-alloying design and a precise controllable thermal mechanical treatment process, the application solves the technical problems that the existing aluminum-lithium alloy is high in cost due to the dependence on high-content noble metals and is anisotropic in mechanical properties due to strong deformation texture, and provides an ideal material which is excellent in comprehensive performance and economically feasible for a space cabin structure.

The invention relates to the technical field of magnesium phosphate cement materials, and particularly discloses a magnesium potassium phosphate cement-based material with high compactness and high salt corrosion resistance and application of the magnesium potassium phosphate cement-based material. The magnesium potassium phosphate cement-based material is prepared from the following components in parts by weight: 30 to 40 parts of dead burned magnesium oxide, 15 to 20 parts of monopotassium phosphate, 3 to 5 parts of retarder, 0.01 to 0.03 part of crystalline phosphate, 30 to 40 parts of fine aggregate and 8 to 13 parts of mixing water. Wherein the molecular formula of the crystalline phosphate is KNaMg2 (PO4) 2.14 H2O. By introducing the crystalline phosphate in a special structural form, the hydration evolution path and the microstructure of the magnesium potassium phosphate cement-based material in a salt erosion environment are effectively improved, and the salt erosion resistance is remarkably improved.

The invention belongs to the technical field of electronic materials, and discloses a magnesium-strontium double-doped calcium fluoride crystal and a preparation method and application thereof.The method comprises the steps that firstly, disodium ethylene diamine tetraacetate is chelated with calcium and magnesium ions, and the calcium and magnesium ions and villiaumite are subjected to a coordination exchange reaction to prepare a magnesium-doped calcium fluoride microsphere precursor; regulating and controlling hydrolysis of 3-aminopropyltriethoxysilane through an absolute ethyl alcohol-deionized water mixed solvent, and realizing uniform anchoring and deposition of strontium ions by virtue of an interface connection effect of the 3-aminopropyltriethoxysilane, so as to construct a magnesium-strontium double-doped precursor with a core-shell structure; carrying out hot pressed sintering in a CF4 / Ar mixed atmosphere to obtain a high-density polycrystalline blank; and finally, finishing crystal oriented growth by adopting a Bridgman-Stockbarger method. Through the synergistic effect of the components in the whole process, gradient uniform doping of magnesium and strontium ions is achieved, lattice distortion is effectively eliminated, the optical uniformity, the anti-laser-damage threshold value and the mechanical stability of the crystal are improved, and the prepared crystal can be widely applied to manufacturing of special electronic materials such as semiconductor wafers and the like and has good industrialization prospects.

This invention relates to the field of hot extrusion manufacturing technology, specifically to a high-strength weldable 6xxx series aluminum alloy profile, its manufacturing method, and its application. The aluminum alloy profile is composed of the following weight percentages: Si: 0.80%~1.2%, Fe≤0.20%, Cu: 0.40%~0.80%, Mn: 0.30%~0.70%, Mg: 0.70%~1.1%, Cr≤0.25%, Zn≤0.10%, Ti≤0.10%, Zr: 0.05%-0.20%, Pb<0.01%, with the balance being Al and unavoidable impurities. The profile meets the following performance requirements: tensile properties, R... m ≥420MPa, R p0.2 ≥330MPa, A 50mm ≥8.0%; Fatigue performance: at r=0.1, N=1×10 7 Under the same conditions, the fatigue strength σ of the smooth sample is ≥145MPa, realizing the lightweight manufacturing of high-speed trains.

The application provides a high-strength aluminum alloy for 3C electronic products and a preparation method thereof, which comprises six steps of smelting, refining, casting forming, homogenization treatment, quenching and aging. The preparation process of the aluminum alloy is optimized by strictly reducing the content of Fe and Cu, improving the atomic ratio of Mg and Si, guaranteeing the synergistic effect of Al, Mg and Si, and promoting the uniform and stable precipitation of the strengthening phase. The coarse G.P. zone formed after the aluminum alloy is quenched and stored at room temperature can be avoided, the demand for high dispersion of the strengthening phase is met, and the mechanical properties of the aluminum alloy are significantly improved. The yield strength of the aluminum alloy is 288 MPa-305 MPa, the tensile strength is 302 MPa-313 MPa, the precision range of the accessory after the aluminum alloy is processed into 3C product accessories is ±0.009 mm-±0.02 mm, the surface color difference value ΔE of the accessory after anodic oxidation is 0.31-0.45, and the tolerance fluctuation rate and the color difference fluctuation rate are both lower than 7%. The aluminum alloy does not need to add expensive metals, the crystal phase structure is uniform, has high strength and high plasticity, is easy to popularize and implement, and can meet the processing requirements of 3C electronic products and ultra-high-precision medical devices.

The invention discloses a heat-resistant creep-resistant aluminum alloy conductor and a preparation method thereof, and belongs to the field of preparation of aluminum alloy conductive cable materials. The aluminum alloy conductor disclosed by the invention is prepared from the following components in percentage by mass: 0.25 to 0.75 percent of Fe, 0.25 to 0.75 percent of Ni, 0.2 to 1 percent of Me and the balance of aluminum and inevitable impurities. Me is composed of La, Nd, Sc, Zr and Ce. Fe and Ni in a fixed proportion are introduced into an aluminum matrix, meanwhile, specific types of mixed rare earth elements, Sc and Zr elements are introduced, and the technology of large-strain extrusion, multi-pass continuous drawing and subzero treatment matched with continuous heat treatment is utilized; therefore, multiple nanoscale precipitated phases are precipitated in aluminum matrix grains, micron-sized dispersion strengthening phases are formed at grain boundaries, and the strength, the ductility, the conductivity and the creep resistance of the aluminum alloy conductor are improved synergistically through multiple scales and multiple kinds of alloy phases.

The invention belongs to the technical field of metal material preparation, and particularly relates to ultralow-density Fe-Mn-Al-C steel and a preparation method thereof.The preparation method comprises the following steps that S1, a Fe-Mn-Al-C casting blank is obtained, and gradient solid solution is conducted on the Fe-Mn-Al-C casting blank to obtain a solid solution casting blank; the gradient solid solution comprises a first solid solution and a second solid solution, and the Fe-Mn-Al-C casting blank comprises the following components in percentage by mass: 1.35%-1.60% of C, 33.5%-36.0% of Mn, 12.5%-15.5% of Al and the balance of Fe and inevitable impurities; and S2, the solid solution casting blank is subjected to fast forging and radial forging, Fe-Mn-Al-C steel is obtained, and the density of the Fe-Mn-Al-C steel ranges from 6.09 g / cm < 3 > to 6.25 g / cm < 3 >. Through reasonable chemical components and process design, the ultralow-density Fe-Mn-Al-C steel is obtained by adopting the forging treatment processes of smelting, blank casting, gradient type solution treatment and fast forging and radial forging, the structure of the Fe-Mn-Al-C steel comprises 85-92 vol% of austenite and 15-8 vol% of ferrite, the austenite further comprises a precipitated phase, the precipitated phase comprises kappa-carbide, and the thickness of the ferrite is 10-20 micrometers. According to the ultralow-density Fe-Mn-Al-C steel, the yield strength at the room temperature is 780-860 MPa, the tensile strength is 960-1020 MPa, the ductility is 30%-40%, and the specific strength is 155-165 MPa.cm < 3 > / g.