14 results about "La element" patented technology

The application provides a copper alloy, a preparation method thereof and an elastic electronic component, and relates to the technical field of copper alloys.The copper alloy comprises the following elements in percentage by mass: the content of Ti element is 2.70-4.20%, the content of Y element is 0.010-0.030%, the content of La element is 0.010-0.030%, the content of B element is 0.010-0.020%, the total content of unavoidable impurities is less than or equal to 0.01%, and the balance is Cu element and M element; wherein, the M element is Fe element or P element, when the M element is Fe element, the content of Fe element is 0.28-0.45%, and when the M element is P element, the content of P element is 0.05-0.15%. The copper alloy has excellent tensile strength, hardness, elastic modulus and conductivity.

The application relates to a high-entropy perovskite material and a preparation method and application thereof, the chemical formula of the high-entropy perovskite material is AB03, wherein the A-site element is a La element, and the B-site element is selected from 5-10 kinds of transition metal elements; the high-entropy perovskite material has a two-dimensional Turing structure, nano-particles are cross-linked and arranged, and there are gaps between the particles. Compared with the prior art, the two-dimensional Turing structure high-entropy perovskite material has unique morphology and components, excellent electrocatalytic water decomposition hydrogen production performance, and fluctuation power adaptability of clean energy such as wind energy and solar energy, and has a wide industrial application prospect.

The invention discloses an alloy diffusion source and diffusion method of a rare earth permanent magnet material, and belongs to the technical field of magnetic materials. For magnets with different Ce contents, La-containing heavy rare earth diffusion sources (LaxHRE1-x) yM100-y with different La contents are adopted, on one hand, the content of REFe2 phase in the crystal boundary of the magnet can be reduced by introducing the La element, so that the diffusion depth is increased, the crystal boundary diffusion effect is improved, on the other hand, the introduction of the La element is reduced as much as possible, and deterioration of the thin-layer crystal boundary caused by aggregation of the La element in the crystal boundary is avoided. The invention also designs a low-temperature long-time and high-temperature short-time diffusion process matched with the method, the REFe2 phase in a diffusion channel is reduced to the maximum extent, the diffusion depth of the heavy rare earth element is improved, and more and more complete high-HA core-shell structures are formed. The invention aims to solve the problem that the improvement amplitude of the coercive force of the magnet after grain boundary diffusion is small due to the fact that a REFe2 phase exists in a Ce-based magnet and hinders and absorbs a diffusion source.

The invention discloses a high-strength corrosion-resistant aluminum alloy for an automobile battery tray and a preparation method thereof.According to the high-strength corrosion-resistant aluminum alloy for the automobile battery tray and the preparation method thereof, by adding the La element in a specific proportion and regulating and controlling the content of Si and Mg, the corrosion resistance of the material is remarkably improved on the premise that the strength is not sacrificed, in addition, addition of the Cr element is avoided, meanwhile, the La element is introduced, the plastic deformation capacity of the alloy is effectively improved, and the service life of the alloy is prolonged. And an ultrasonic treatment process is combined to promote the uniformity of the melt, so that the complex-section profile is easier to extrude and form, the production efficiency is favorably improved, and the defects such as dragging and breaking are not easy to occur. The La element is added, the morphology of Si particles is converted from a continuous sheet shape to a discontinuous short rod shape, extension of corrosion along a grain boundary is effectively hindered, and the alloy has remarkable mechanical performance and corrosion resistance by combining the synergistic effect of a specific refining agent, components and the process.

The invention discloses a La pre-doped high-cerium neodymium-iron-boron magnet and a preparation method thereof. According to the method, the La element with the specific content is pre-doped in the magnet base material, and the two-step grain boundary diffusion process that the continuous grain boundary network is firstly constructed and then the heavy rare earth hardened shell layer is constructed is combined, so that the problem that the grain boundary diffusion efficiency of the high-Ce magnet is low is successfully solved, the high-performance La pre-doped high-Ce neodymium-iron-boron magnet is obtained with the lowest heavy rare earth cost, and the high-performance La pre-doped high-Ce neodymium-iron-boron magnet is obtained. The La pre-doped high-Ce neodymium-iron-boron magnet has high coercive force, high residual magnetism and good temperature stability. The manufacturing process disclosed by the invention is extremely low in heavy rare earth consumption, remarkable in comprehensive cost advantage and excellent in industrial application prospect.

Disclosed are a cast 5A duplex stainless steel and a method for preparing a large casting made of this steel. By controlling contents of Cr and Mo elements and meanwhile adding W, Nb, Ce and La elements, precipitation of a brittle phase can be avoided through a coupling effect of the four elements, the precipitation of the brittle phase during a slow cooling process of the large casting is avoided, crack defects of the large casting during a casting process are fundamentally solved, and a finished product rate of the casting can be increased to 95% or above. Meanwhile, with increase of a process yield and implementation of cold mold opening and shakeout, the casting production cost is substantially reduced, safety risks during a production process are greatly reduced, and the labor intensity of workers is reduced.

The application discloses a rare earth La modified weather-resistant steel and a preparation method thereof, and belongs to the technical field of Q500qenh weather-resistant steel preparation. The weather-resistant steel comprises the following raw material components: C, Si, Mn, Cr, Ni, Cu, Mo, V, Ti, Nb, Al, 0.001-0.04wt% La, and the balance of Fe and inevitable impurities. Through precise regulation and control of the La element addition amount and the preparation process, the inherent problems of the Q500qenh steel, such as uneven as-cast grains, inclusion hazards and performance fluctuation, are solved.

The invention provides a copper alloy, a preparation method thereof and an elastic electronic component, and relates to the technical field of copper alloys. The copper alloy is prepared from the following elements in percentage by mass: 2.70 to 4.20 percent of Ti element, 0.010 to 0.030 percent of Y element, 0.010 to 0.030 percent of La element, 0.010 to 0.020 percent of B element, less than or equal to 0.01 percent of total content of inevitable impurities and the balance of Cu element and M element, wherein the M element is an Fe element or a P element, and when the M element is the Fe element, the content of the Fe element is 0.28-0.45%; and when the M element is a P element, the content of the P element is 0.05-0.15%. The copper alloy has excellent tensile strength, hardness, elasticity modulus and electric conductivity.

The invention belongs to the technical field of gas sensing, and particularly relates to a phosphorus-lanthanum co-doped TiO2-based oxygen sensing material as well as a preparation method and application thereof. According to the oxygen sensing material, TiO2 is used as a main crystalline phase, and meanwhile, phosphorus and lanthanum are introduced to form a P / La co-doped structure; wherein the doping amounts of the P element and the La element are respectively 1-3 mol% of the Ti element, and the particle size of the material is 1-3 [mu] m. Wherein the synergistic doping of P and La not only regulates and controls the lattice structure of TiO2, but also induces the generation of a large number of oxygen vacancies, and significantly increases the specific surface area and the number of gas adsorption active sites. The material can be synthesized from TiO2 powder, soluble lanthanum salt and phosphoric acid / phosphate through a solvothermal method, and is applied to a Pt interdigital electrode to obtain a high-performance oxygen sensing gas sensitive element. The problems that an existing gas sensitive element is insufficient in sensitivity, poor in selectivity and poor in environmental stability in ppb-level low-concentration oxygen detection are solved.

The application belongs to the technical field of rare earth permanent magnet materials, and particularly relates to a diffusion source, a preparation method of the diffusion source and a method for improving coercivity of a magnet. The diffusion source comprises lanthanum elements, heavy rare earth elements and non-rare earth elements; wherein the heavy rare earth elements are one or a combination of two or more of dysprosium elements, holmium elements, terbium elements and gadolinium elements; and the non-rare earth elements are one or a combination of two or more of aluminum elements, copper elements, cobalt elements and gallium elements. The diffusion source introduces La elements with stronger oxidizability, can promote Ce elements to enter a main phase, and reduce the influence of CeFe2 phase on diffusion of the heavy rare earth elements; meanwhile, due to the stronger oxidizability of the La elements than the heavy rare earth elements, the heavy rare earth oxides gathered in a grain boundary phase are reduced, the utilization rate of the heavy rare earth elements in the diffusion process is improved, the diffusion of the magnet is more uniform, the coercivity of the magnet is significantly improved, and the temperature coefficient of the magnet is improved.

The invention relates to a high-capacity easy-to-activate TiFe-based hydrogen storage alloy, which belongs to the technical field of solid hydrogen storage materials, the chemical general formula of the hydrogen storage alloy is TiFexMnyLaz, and the chemical general formula satisfies the following conditions: 0.8 < = x < = 0.96, 0.04 < = y < = 0.1, 0.005 < = z < = 0.05, and 0.84 < = x + y < = 1, the Ti-rich phase proportion in the alloy does not exceed 5%, and the La element is dissolved in the alloy. Compared with the prior art, the high-capacity TiFe-based hydrogen storage alloy provided by the invention is excellent in hydrogen storage performance and can be activated at about 80 DEG C, and the hydrogen absorption capacity at 25 DEG C can reach 1.80 wt.% or above; the TiFe-based hydrogen storage alloy provided by the invention is simple in component design, the problem that the TiFe alloy is difficult to activate can be solved only by adding a small amount of Mn and La, meanwhile, the hydrogen storage capacity of the alloy is improved, and the alloy cost is reduced.

The invention discloses a La element reinforced rare earth magnesium alloy and a preparation method thereof, and relates to the technical field of metal material manufacturing, and the preparation method comprises the steps that La2O3 particles and an organic solvent are mixed to prepare La2O3 turbid liquid; coating the La2O3 suspension on the surface of the rare earth magnesium alloy wire, and drying to obtain the rare earth magnesium alloy wire with La2O3 particles attached on the surface; the rare earth magnesium alloy wire with the La2O3 particles attached to the surface serves as a raw material for additive manufacturing, layer-by-layer deposition is carried out through an electric arc fuse additive manufacturing process, in the deposition process, the wire is molten through an electric arc heat source to form molten drops and a molten pool, and under the high-temperature effect of an electric arc, the La2O3 particles and liquid magnesium are subjected to an in-situ reaction, so that the rare earth magnesium alloy is obtained. The decomposed La element is fused into an original rare earth magnesium alloy system; and after deposition is completed, the La element reinforced rare earth magnesium alloy deposition state component is obtained. By means of the method, the room-temperature and high-temperature mechanical properties of the rare earth magnesium alloy can be effectively enhanced, the process is simple and universal, and industrialization is easy.

The invention relates to the technical field of aluminum alloy materials, and discloses a cast aluminum alloy material which comprises the following components in percentage by mass: 11.5-13.5% of Si, 1.5-2.5% of Mg, 0.4-0.6% of Cu, 0.4-0.65% of Ni, 0.1-0.3% of Mn, 0.05-0.15% of rare earth elements and the balance of Al and inevitable impurities. The material cost is remarkably reduced by reducing the content of expensive Ni and Cu elements, and meanwhile, the high-temperature mechanical property of the material can be improved by adding a trace amount of La element. According to the method, the cast ingot is subjected to rapid water cooling, so that more solute atoms are dissolved in a matrix, and the mechanical property of the material can be improved by separating out a fine dispersed phase in the subsequent direct aging treatment process.

The application discloses a kind of rare earth enhanced electromigration resistance SnAgCu solder and its preparation method and application, belong to electronic packaging solder field.The application solves the problem of insufficient anti-electromigration capacity of existing SnAgCu alloy solder etc.The application adds rare earth element Ce, La in Sn3.5Ag0.75Cu alloy solder, and controls its content in alloy, utilizes the higher affinity of rare earth element Ce, La element and Sn element, after welding, in alloy solder organization, it tends to form Ce-La-Sn regular polygon second phase by Ce, La, Sn, which is jointly composed, the second phase particle effectively refines the organizational structure of alloy solder, and effectively resists the movement of dislocation line when alloy solder produces plastic deformation, so that Sn3.5Ag0.75Cu alloy solder strength and anti-electromigration performance are improved.