5results about How to "Enhanced pinning" patented technology

This invention belongs to the field of aluminum alloy materials technology, and relates to a high-strength and ductile aluminum alloy and its preparation method. The alloy comprises, by mass fraction: 2-6% Mg, 0.4-0.9% Mn, 0.2-0.6% Si, 0.05-0.15% Sn, Fe≤0.15%, Ti≤0.1%, with the balance being Al. By introducing Sn, a low-melting-point MgSiSn primary phase is formed in the as-cast stage, and transforms from a continuous network to a discontinuous granular structure during homogenization heat treatment, weakening the adverse effects of brittle intermetallic compounds at grain boundaries. Simultaneously, Sn dissolved in the aluminum matrix forms a nanoscale MgSiSn precipitate during homogenization, serving as a heterogeneous nucleation core for the Mn-containing second phase, lowering its nucleation energy barrier, and promoting high-density, fine, and uniform precipitation, thereby achieving a synergistic improvement in the alloy's strength and ductility.

This invention belongs to the field of advanced nuclear energy structural materials preparation and performance regulation technology, specifically relating to a strong magnetic field heat treatment method for improving the mechanical properties and radiation resistance of RAFM steel. The method includes the following steps: 1) obtaining raw RAFM steel; 2) quenching and tempering the raw RAFM steel sequentially; 3) placing the tempered RAFM steel in a vacuum heat treatment furnace and simultaneously applying a steady strong magnetic field for long-term high-temperature aging treatment; 4) after aging, cooling the RAFM steel to room temperature under magnetic field maintenance or slow demagnetization conditions to obtain reinforced RAFM steel. By introducing a steady strong magnetic field as an active control method into the high-temperature aging process, the microstructure of ferromagnetic materials is optimized through the physical effects of the magnetic field on atomic diffusion, phase transition behavior, and precipitation kinetics, thereby synergistically improving its mechanical properties and radiation resistance.

The present invention belongs to the technical field of rare earth permanent magnet materials, and specifically relates to a high-abundance rare earth rapid quenching alloy and a preparation method thereof. In order to synergistically improve the solubility of La, the Ce 3+ proportion and magnetic properties in the high-abundance rare earth rapid quenching alloy, the high-abundance rare earth rapid quenching alloy of the present invention is expressed in atomic percentage as (La 1.53 Ce 3.57 RE 11.9 )-M x Fe 78‑x -B6, where 0 < x < 1; RE is an optionally added rare earth element selected from one or more of Nd, Pr, Dy, and Tb; M is a doping element selected from at least one of Ag, Sn, Au, and Cu, and the mixing formation enthalpy of the binary system formed by M and Fe is greater than the mixing formation enthalpy of the binary system formed by La and Fe, and it is prepared by a two-step method of vacuum induction melting and melt rapid quenching. The present invention can significantly improve the solubility of La in the matrix phase, and while maintaining a high proportion of Ce 3+ , it greatly optimizes the coercivity and the maximum magnetic energy product.

The application discloses a high-coercivity neodymium-iron-boron magnet and a preparation method thereof. By introducing manganese elements with a specific content and making the manganese elements and other components produce a synergistic effect under a specific sintering and tempering process, the intrinsic coercivity of the magnet is significantly improved, is 30-50% higher than that of a conventional magnet, and reaches 3500-4000 kA / m. Meanwhile, the magnet has excellent high-temperature stability and corrosion resistance, and is particularly suitable for 3C electronic products with strict requirements on volume and performance.

The application discloses a preparation method of a high-performance diffusion Sm-Co composite permanent magnet, and comprises the following steps: mixing alloy components according to (Sm, Re)2(Co, A) 17 After the alloy components are mixed, a proper amount of BiI3 is added, magnetic field orientation forming is carried out, and a Sm-Co magnet green body is obtained; the Sm-Co magnet green body is vacuum pre-fired under certain temperature conditions, and a magnet with a network channel structure in the interior is formed; a soft magnetic phase nano-level Fe or Co powder is mixed with an organic solvent to form a diffusion source mixed solution, the pre-fired Sm-Co magnet is immersed into the mixed solution, and after being taken out, the Sm-Co magnet is placed into a vacuum oven and dried. The BiI3 sublimation technology is used to make the soft magnetic phase and the doped elements effectively enter the grain boundary of the Sm-Co magnet, improve the coupling effect and pinning effect of the soft and hard magnetic phases, and improve the coercive force and maximum magnetic energy product. The preparation method is simple in process, low in cost, less in introduced impurities, and capable of maintaining the magnetic performance of the hard magnetic phase to the maximum extent.