9 results about "Gd element" patented technology

The invention belongs to the technical field of soluble magnesium alloy rods, and discloses a soluble magnesium alloy rod with enhanced elongation, and the magnesium alloy rod comprises the following chemical components in percentage by mass: 1.5%-14.5% of Gd element, 0.5%-4.0% of Y element, 0.1%-2.5% of Zn element, 0.2%-0.5% of Zr element, 0.01%-0.5% of Li element, 0.01%-0.6% of Ni element, 0.01%-0.5% of Ga element, 0.01%-0.5% of In element, 0.1%-2.0% of Cu element and the balance of Mg element. In component design, various elements are scientifically proportioned, the proportion of Gd to Y and the proportion of Zn to Zr are just right, specific elements are added to form a composite structure, the ductility is improved, the dissolution rate and strength are balanced by means of the Cu element, in the performance aspect, dissolution is accelerated at the high temperature of 200 DEG C, the dissolution rate is increased by 10%-15% compared with the room temperature, the degradation period can be shortened, a dissolved product is fine and uniform, and the degradation rate is high. The biocompatibility and environmental friendliness are excellent, the application field is wide, and degradable medical instruments are covered.

The application relates to a high-temperature-stability rare earth cobalt permanent magnet material and a preparation method, and belongs to the technical field of rare earth permanent magnet materials. The application solves the problems of poor temperature stability, large temperature coefficient and large magnetic flux change in the prior art. The high-temperature-stability rare earth cobalt permanent magnet material is prepared by compounding A alloy and B alloy according to mass proportions, wherein the mass proportion of the A alloy is 50% to 80%; the A alloy comprises 2 to 4 rare earth elements, wherein the content proportion of Gd element in the rare earth elements is not less than 50%; and the B alloy comprises 2 to 4 rare earth elements, wherein the content of Sm element in the rare earth elements is not less than 80%. The preparation of the high-temperature-stability rare earth cobalt permanent magnet material is realized.

The application provides a high-aluminum high-gadolinium low-indium sintered neodymium-iron-boron permanent magnet and a preparation method thereof, and belongs to the technical field of permanent magnets.The main alloy raw material and the auxiliary alloy raw material with specific compositions are separately subjected to rapid solidification casting to obtain main alloy castings and auxiliary alloy castings; the main alloy castings and the auxiliary alloy castings with specific proportions are subjected to double-alloy hydrogen crushing to obtain coarse powder; the coarse powder is mixed with an antioxidant and subjected to airflow milling to obtain fine powder; the fine powder is mixed with a lubricant and sequentially subjected to orientation forming, sintering and tempering to obtain the high-aluminum high-gadolinium low-indium sintered neodymium-iron-boron permanent magnet.In the application, the Al and Gd element contents in the sintered neodymium-iron-boron permanent magnet are high, and the low-melting-point In element is added in the form of an alloy to improve the grain boundary distribution of the magnet; without adding Dy and Tb heavy rare earth elements, the sintered neodymium-iron-boron permanent magnet with a magnetic property of 12kGs remanence and a coercive force of 23kOe can be obtained, and the production cost is saved.

The invention discloses a creep-resistant magnesium alloy with high elasticity modulus and high damping and a preparation method thereof, and the creep-resistant magnesium alloy with high elasticity modulus and high damping comprises the following components in percentage by mass: 1.2%-3.5% of Zn element, 2.5%-12% of Gd element, 0.5%-6% of Yb element, 0.15%-1.2% of Ni element, 0.3%-0.8% of Mn element, 0-0.5% of Cu element, 0.1%-5% of HRE element and the balance of Mg element. The HRE element is one or more of a Dy element, a Sm element and a Tb element, and the mixing enthalpy delta H of the creep-resistant magnesium alloy with the high elastic modulus and the high damping is-1.1 kJ / mol to-0.2 kJ / mol. The creep-resistant magnesium alloy with high elastic modulus and high damping is suitable for the fields of aerospace, precise instruments, transportation, 3C electronics and the like, and has remarkable technical and economic values.

The application provides a cast rare earth magnesium alloy and a preparation method thereof, and relates to the technical field of magnesium alloys. The cast rare earth magnesium alloy comprises the following elements in percentage by mass: the content of Gd element is 4.5-6.50%, the content of Y element is 0.5-2.0%, the content of Nd element is 0.05-1.2%, the content of Er element is 0.05-0.5%, the content of Zn element is 0.3-1.2%, the content of Zr element is 0.3-0.6%, the total content of unavoidable impurities is less than or equal to 0.1%, the content of single impurity is less than 0.05%, and the balance is Mg element. In the application, the addition of Gd element, Y element, Nd element and Er element can weaken the basal texture of the magnesium alloy and improve the plasticity. Controlling the content of each element in the above range is helpful to improve the interaction between the elements, thereby helping the magnesium alloy to realize good strength-plasticity synergy.

The application relates to the technical field of preparation of rare earth permanent magnet materials, in particular to a method for improving the brittleness of high-coercivity blank material, which comprises designing the matrix alloy component of a sintered neodymium-iron-boron magnet as follows: Nd a M b N c O d Fe 100‑a‑b‑c‑d‑e B e ; wherein Nd is a neodymium element; M is at least one of La, Ce and Pr elements; N is at least one of Dy, Tb and Gd elements; O is at least one of Co, Mn, Cu, Al, Ti, Ga, Zr, V, Hf, W and Nb elements; Fe is an iron element, and B is a boron element; a, b, c, d and e satisfy the following relations: 27.5 <= a <= 31, 8.5 <= b <= 12, 0.05 <= c <= 0.2, 0 <= d <= 5 and 0.9 <= e <= 1.2; wherein a, b, c, d and e all represent mass percentage contents; the matrix alloy component of the neodymium-iron-boron magnet provided by the application has good toughness of the blank obtained through powdering, forming and sintering, and can effectively avoid the problems of breakage such as edge chipping and corner chipping.

This invention provides a core-shell structure R-T-B rare earth permanent magnet with Gd-rich cores for high-temperature environments. In the magnet, the rare earth element R content is 29.0 wt.% to 34.0 wt.%, and R is composed of Gd and R1. The Gd element content is 1.0 wt.% to 20.0 wt.% of the magnet mass. The main phase grains contain main phase grains with a volume ratio of 20 vol.% to 80 vol.% of Gd-rich cores and Gd-poor shells. This invention employs a dual-alloy method to separately melt alloy sheets with high and low Gd contents, then prepares sintered magnets. During high-temperature diffusion treatment, Gd elements in the high-Gd-content main phase diffuse into the R-rich phase at the grain boundaries. Ultimately, the high-Gd-content main phase grains form an anti-shell structure with a Gd-depleted shell and a Gd-rich core. The Gd-depleted shell significantly reduces the degradative effect of Gd on the magnet's coercivity, thus fully utilizing the characteristics of Gd to prepare a magnet with a low temperature coefficient and high coercivity. Grain boundary diffusion treatment of Dy / Tb elements can further improve the magnet's coercivity, preparing R-T-B rare-earth permanent magnets suitable for higher operating temperatures.

The invention provides a heat-resistant magnesium alloy capable of regulating and controlling strength and plasticity through a double-peak structure and a preparation method of the heat-resistant magnesium alloy, and belongs to the technical field of alloy materials. By adding the Gd element, the magnesium alloy can have a high recrystallization degree, so that the magnesium alloy has finer grains, a large number of granular Al2RE phases and chain-shaped Mg12Nd in the magnesium alloy inhibit precipitation of Mg17Al12 phases on one hand, and effectively inhibit dislocation movement at high temperature on the other hand, so that the magnesium alloy has good mechanical properties. Under the dual effects of fine grain strengthening and second phase strengthening, the magnesium alloy can keep high yield strength even at high temperature. And under the action of the second phase, residual deformed grains in the extrusion process can be further recrystallized in the thermal deformation stage, so that the grains of the alloy are refined, and the strong plasticity synergy of the alloy is promoted.

The invention relates to a Fe-Gd-B-Cu nanocrystalline alloy with excellent soft magnetic performance and a preparation method and application of the Fe-Gd-B-Cu nanocrystalline alloy, and belongs to the technical field of alloy materials. The invention provides Fe-Gd-B-Cu with excellent soft magnetic performance, the atomic percentage expression of the nanocrystalline alloy is FexGdyBmCin, x is the atomic content corresponding to the Fe element, y is the atomic content corresponding to the Gd element, m is the atomic content corresponding to the B element, n is the atomic content corresponding to the Cu element, 85 < = x < = 95, 1 < = y < = 3, 5 < = m < = 8, 0.1 < = n < = 2, and x + y + m + n = 100. The Cu element is added into a Fe-Gd-B nanocrystalline alloy system, the soft magnetic performance of the nanocrystalline alloy material is optimized, the Fe-based alloy with excellent soft magnetic performance is obtained, typical soft magnetic performance is presented, and the nanocrystalline alloy with low coercive force and high saturation magnetization intensity is obtained.