12results about How to "Improve squareness" patented technology

The invention relates to the technical field of neodymium-iron-boron magnets, in particular to a neodymium-iron-boron rare earth magnet and a preparation method thereof.The neodymium-iron-boron rare earth magnet is a sintered neodymium-iron-boron permanent magnet and comprises a main phase, a two-particle grain boundary phase and a triangular area grain boundary phase; the main phase comprises an R2T14B phase, R refers to at least one of Nd and Pr, T refers to Fe, and Co at least contains Fe; the two-particle grain boundary phase comprises a grain boundary copper-rich phase, and / or a needle-shaped ZrBx phase with the width of 10-50 nm, and / or a needle-shaped TiBx phase with the width of 10-50 nm; the triangular region grain boundary phase comprises an FCC type NdOx phase, an RCu phase, an RGa phase, an R-rich phase, a 6: 14 phase and / or a needle-shaped ZrBx phase with the width of 10-50 nm and / or a needle-shaped TiBx phase with the width of 10-50 nm, the neodymium-iron-boron rare earth magnet does not contain heavy rare earth and is good in uniformity, and the coercive force and residual magnetism can be regulated and controlled through the design of the grain boundary phase.

The invention discloses auxiliary alloy nano powder, modified magnetic powder, a sintered neodymium-iron-boron magnet and a preparation method. According to the preparation method of the auxiliary alloy nanopowder for modifying the magnetic powder, the chemical component of the auxiliary alloy nanopowder is Re100-m-n (Cu, X) mQn, Re is a light rare earth element, X is selected from at least one of Al, Ga, Co, Mg, Sn, Te and Sb, and Q is selected from at least one of Ti, Zr, Hf, V, Nb, Ta, W and Mo; m and n are atomic numbers respectively, m is greater than or equal to 24 and less than or equal to 72.4, n is greater than or equal to 12.5 and less than or equal to 76, and 100-m-n is greater than or equal to 0; the auxiliary alloy nano powder does not contain Fe and B; the preparation method comprises the following steps: (1) providing an auxiliary alloy sheet; and (2) mixing the auxiliary alloy sheet, a modified substance and an organic solvent, and carrying out primary crushing and fine crushing to obtain the auxiliary alloy nano powder. The coercive force and the squareness of the sintered neodymium-iron-boron magnet can be improved, and the absolute value of the residual magnetism temperature coefficient and the absolute value of the coercive force temperature coefficient of the sintered neodymium-iron-boron magnet are reduced.

The invention discloses a method for simultaneously optimizing the squareness and the remanence temperature coefficient of a 2: 17 type samarium-cobalt sintered magnet, and belongs to the technical field of rare earth permanent magnet material preparation. A component Sm < 1-x > RE < x > (CobalFeaCubZrc) z is designed, RE is one or more of Dy, Er, Gd, Tm and other heavy rare earth elements, and a, b, c and x meet the following relations: 0 < = x < = 0.6, 0.1 < = a < = 0.2, 0.06 < = b < = 0.12, 0.02 < = c < = 0.03, and 6.9 < = z < = 7.9. On the basis of a conventional smelting and ingot casting-isothermal annealing-powder preparation-oriented profiling-sintering-solid solution-aging process, an isothermal annealing process is added after smelting and ingot casting: the temperature is raised to 1190-1210 DEG C in a tubular furnace, isothermal annealing is performed for 5-20 hours, heavy rare earth elements are eliminated, and the influence of the stability of a 2: 17H phase on the component uniformity and magnetic performance of a magnet is improved; and substitution sites of heavy rare earth can be increased, and the residual magnetism temperature coefficient is optimized.

The present invention belongs to the technical field of permanent magnetic materials, and relates to a heavy rare earth-free high-performance lanthanum-cerium rare earth permanent magnet and a manufacturing method thereof. The chemical composition of the lanthanum-cerium rare earth permanent magnet is expressed as: [(R1) 1‑x (R2) x ] a M1 b M2 c M3 d B e Fe 1‑a‑b‑c‑d‑e , wherein: 10%≤x≤25%, 29.5%≤a≤32.5%, 1%≤b≤2%, 0.5%≤c≤1%, 0%<d<2.5%, 0.85%≤e≤0.95%, wherein R1 is one or both of Pr and Nd, R2 is one or both of La and Ce, M1 is Cu and Ga, M2 is Nb and Zr, and M3 is one or more of Al, Co, and Mn. The present invention reasonably controls the composition of the permanent magnet to obtain a high-performance lanthanum-cerium magnet without adding heavy rare earth elements, effectively reduces the production cost of the magnet, and broadens the application of the lanthanum-cerium magnet in the market.

The invention relates to a samarium-cobalt magnet waste recycling and regenerating method which comprises the following steps that samarium-cobalt magnet waste is processed into a samarium-cobalt magnet base body, and the residual magnetism of the samarium-cobalt magnet waste is larger than or equal to 11 kGs; the samarium-cobalt magnet base body is subjected to hydrogen absorption treatment at the normal temperature, a hydrogen absorption samarium-cobalt magnet is obtained, the hydrogen absorption treatment pressure ranges from 1 kPa to 10 kPa, and the hydrogen absorption treatment time ranges from 10 min to 60 min; the samarium-copper alloy slurry is placed on the surface of the hydrogen absorption samarium-cobalt magnet, a diffusion layer is formed after drying, then diffusion heat treatment is carried out, the diffused samarium-cobalt magnet is obtained, and the diffusion heat treatment process comprises the steps that heating is carried out to 750-900 DEG C, heat preservation treatment is carried out for 10-20 h, and then cooling is carried out to 350-450 DEG C at the speed of 0.3-0.7 DEG C / min; and processing the diffused samarium-cobalt magnet into a samarium-cobalt magnet finished product, wherein the thickness difference between the samarium-cobalt magnet substrate and the samarium-cobalt magnet finished product is less than 0.1 mm. According to the recycling and regenerating method for the samarium-cobalt magnet waste, the technological process is simplified, the cost is reduced, the waste recycling efficiency is high, and meanwhile the samarium-cobalt magnet obtained through regeneration has high coercive force.

The invention discloses a neodymium-iron-boron magnet and a preparation method and application thereof. The first easy demagnetization area, the non-easy demagnetization area and the second easy demagnetization area are sequentially arranged in the direction perpendicular to the magnetizing direction; the coercive force ratio of the non-easy demagnetization area to the first easy demagnetization area is (0.7-1): 1 and is not 1: 1, and the coercive force of the first easy demagnetization area is the same as that of the second easy demagnetization area; the distribution of the heavy rare earth elements meets the condition that the concentration ratio 1 of the heavy rare earth elements at the position 0.5 mm away from the surface layer and the position 1 mm away from the surface layer is 1-1.2; the concentration ratio 2 of the heavy rare earth elements at the position which is 1 mm away from the surface layer and the position which is 1.5 mm away from the surface layer is 1-1.25; the concentration ratio 3 of the heavy rare earth elements at the position 1.5 mm away from the surface layer and the position 2 mm away from the surface layer is 1-1.3. The neodymium-iron-boron magnet can ensure high coercive force, high thermal stability, high squareness and high magnetic moment on the premise of reducing the heavy rare earth consumption of the neodymium-iron-boron magnet.

The invention discloses a preparation method for improving the coercivity and squareness of a neodymium-iron-boron magnet, which comprises the following steps: burdening, rapid hardening melt-spinning, hydrogen decrepitation, jet milling, profiling, isostatic pressing and sintering to obtain a sintered neodymium-iron-boron magnet, the aging heat treatment process comprises the steps that the first-stage aging temperature is 850-950 DEG C, heat preservation is conducted for 2-5 hours, the second-stage aging temperature is 400-600 DEG C, inert gas is adopted for atmosphere aging, the pressure intensity is 0.01-0.08 MPa, heat preservation is conducted for 0.5-10 hours, after aging heat treatment is finished, the inert gas is pumped out, then nitrogen is inflated, cooling is conducted to the room temperature, and the neodymium-iron-boron magnet is obtained. The method has the advantages that aging is carried out in the inert atmosphere, heat conduction in the furnace is promoted, saturated vapor pressure of rare earth in the furnace is adjusted, volatilization of a large amount of rare earth elements is reduced, and then the coercivity and squareness of the magnet are remarkably improved.

The invention relates to a double-gradient aging treatment method and a preparation method of a high-performance sintered samarium-cobalt permanent magnet, belongs to the technical field of rare earth magnetic materials, and solves the problem that in the prior art, a high-iron samarium-cobalt permanent magnet is limited by at least one factor of squareness and / or maximum magnetic energy product, so that the comprehensive magnetic performance is difficult to improve. The invention discloses a double-gradient aging treatment method for a high-performance sintered samarium-cobalt permanent magnet. The double-gradient aging treatment method comprises the following steps of pre-gradient aging, isothermal aging and post-gradient aging. The square degree and the maximum magnetic energy product of the magnet are improved at the same time, and the magnet shows more excellent comprehensive magnetic performance.

The invention discloses a neodymium-iron-boron magnet and a preparation method and application thereof. The first easy demagnetization area, the non-easy demagnetization area and the second easy demagnetization area are sequentially arranged in the direction perpendicular to the magnetizing direction; the coercive force ratio of the non-easy demagnetization area to the first easy demagnetization area is (0.7-1): 1 and is not 1: 1, and the coercive force of the first easy demagnetization area is the same as that of the second easy demagnetization area; the concentrations of heavy rare earth elements in the first easy demagnetization area and the second easy demagnetization area are the same, and in the first easy demagnetization area, 4 is 1-1.3; and in the non-demagnetization region, 1 is 1 to 1.2, 2 is 1 to 1.25, and 3 is 1 to 1.3. The neodymium-iron-boron magnet can ensure high coercive force, high thermal stability, high squareness and high magnetic moment on the premise of reducing the heavy rare earth consumption of the neodymium-iron-boron magnet.

The present invention discloses a hanging formwork combination, comprising four hanging formwork templates; J-shaped connector a and J-shaped connector b are respectively arranged at two ends of the hanging formwork template, and both J-shaped connector a and J-shaped connector b are located on the inner side of the hanging formwork template; the hook opening direction of the J-shaped connector a is perpendicular to the length direction of the hanging formwork template, and the hook opening direction of the J-shaped connector b is parallel to the length direction of the hanging formwork template, wherein the hook opening of the J-shaped connector a deviates from the hook opening of the J-shaped connector b; each hanging formwork template is connected at a right angle through the hook of its J-shaped connector a and the hook of the J-shaped connector b of another hanging formwork template, and the four hanging formwork templates are connected in sequence to form a square frame structure. The hanging formwork combination formed by the hanging formwork template has the advantages of convenient assembly operation, wide application range, high connection stability, good squareness and not easy to deform, and it is not necessary to set up steel pipes in the inner frame of the hanging formwork combination to support and reinforce the overall frame, thereby improving construction efficiency.

The application discloses a modified slow-release rare earth alloy, a sintered neodymium-iron-boron magnet and a preparation method thereof. 1‑m X m , m is an atomic percentage content, 35at%<=m<=76at%; wherein, RE is a rare earth element, composed of light rare earth elements and heavy rare earth elements; X is selected from at least one of Ga, In, Si, Ge, Sn, Sb, Bi, S, Se and Te. The modified slow-release rare earth alloy can improve the magnetic performance and high-temperature stability of the sintered neodymium-iron-boron magnet.

The present application relates to sintered Nd-Fe-B rare earth permanent magnet material technical field, specifically to a kind of preparation process of gallium cobalt double-element regulated inorganic fluoride grain boundary diffusion neodymium-iron-boron magnet.The process will be pretreated sintered Nd-Fe-B magnet as matrix, inorganic fluoride powder and gallium source are first ball milled in anhydrous system, form Ga-F interface fixed intermediate slurry;Then add cobalt source and cooperate into film agent, dispersing agent to obtain sequential fixed type composite diffusion source slurry, after coating on the surface of magnet, by low-temperature oxygen-free pre-conversion, grain boundary main diffusion and segmented tempering to obtain modified magnet.The present application is conducive to control the contact sequence and migration state of gallium and cobalt in diffusion source particles, so that neodymium-iron-boron rare earth permanent magnet material can improve intrinsic coercivity while maintaining good remanence, demagnetization curve squareness and high temperature stability.