381results about How to "High energy product" patented technology

The invention discloses a 2:17 type samarium-cobalt sintered magnet material and a preparation method thereof. The 2:17 type samarium-cobalt sintered magnet material comprises the following raw materials in percentage by mass: 10 to 25 percent of samarium, 45 to 55 percent of cobalt, 10 to 20 percent of iron, 3 to 9 percent of copper, 1 to 3 percent of zirconium and 5 to 15 percent of at least one heavy rear earth element. Due to the selection and the proportion of the raw materials and the innovation of the sintering process, a microstructure of the magnet material is optimized, and the aims of reducing the temperature coefficient of a magnet and simultaneously maintaining higher magnetic energy product of the magnet are fulfilled, wherein the magnetic energy product of the prepared magnet is 14 to 25 MGsOe, the residual magnetism temperature coefficient is about -0.005 to -0.03 percent per DEG C, and a lower magnetic flux temperature coefficient is maintained in an environment at the temperature of between -35 and 300 DEG C.

The invention relates to the method used to make rare earth-iron-boron permanent magnetic material with high coercive force which belongs to magnetic material field. The excellent magnetism of the NdFeB permanent magnetism will be obviously reduced while the working environment temperature rises. The invention includes the following steps: using rapid hardening slice technology to make NdFeB rapid hardening slice; smashing to powder with 3-5 micron; making terbium and dysprosium powder with 10-50nm; mixing them with 1-3% weight ratio; orientating at 2.5T magnetic field; processing secondary heat treatment after 2-4 hours sintering at 1050-1120 centigrade degree; the first order heat treatment is at 900-1000 degree centigrade for 1-3h; the secondary is at 550-700 degree centigrade for 1-3h. The invention has better coercive force and lower terbium and dysprosium content compared with the traditional NdFeB permanent magnetic material.

The invention discloses an ultrahigh-coercivity sintered neodymium-iron-boron magnet and a preparation method thereof. The ultrahigh-coercivity sintered neodymium-iron-boron magnet comprises a main phase and a crystal boundary adding phase. The main phase comprises low-HA main alloy and high-HA main alloy. The high magnetocrystalline anisotropy field HA main alloy and the low-HA main alloy are used as the main phase, so that the heavy rare earth element diffuses from the high-HA phase to the low-HA phase in the sintering and heat treatment process to initially improve the coercivity; in addition, alloy components and the preparation technology can be controlled at the same time, the content of Nd2Fe14B in the magnet is improved, and it is ensured that the magnet has the high magnetic energy product. The crystal boundary adding phase can further achieve crystalline grain surface magnetic hardening and improve the coercivity, the microscopic structure is optimized, and the coercivity is further improved. The preparation method of the ultrahigh-coercivity sintered neodymium-iron-boron magnet has the advantages of both a traditional dual alloy method and a single alloy crystal boundary adding method, and is easy to operate and suitable for mass production of ultrahigh-coercivity high-residual-magnetism sintered neodymium-iron-boron magnets.

The invention provides a high-temperature high-coercivity samarium-cobalt permanent magnet material and a preparation method thereof. The permanent magnet material is Sm(Co1-u-v-wFeuCuvZrw)z, whereinu ranges from 0.09-0.18, v ranges from 0.05-0.10, w ranges from 0.02-0.04 and z ranges from 6.9-7.8. The preparation method includes the steps that the rare earth element Sm with the purity of 99.95%,Co with the purity of 99.98%, Cu with the purity of 99.99%, Fe with the purity of 99.9% and Zr with the purity of 99.9% are evenly mixed and smelted into an alloy ingot, and the ingot is subjected tostructure optimization treatment; micron-sized alloy powder is prepared by using the powder metallurgy technology, then orientation forming, high-temperature sintering, solid solution and aging treatment are conducted, and the samarium-cobalt permanent magnetic alloy is prepared. According to the method, the proportion of a TbCu7 structure is effectively improved, and a samarium-cobalt permanentmagnet free of a Zr6(FeCo)23 phase and uniform in structure is prepared, has high coercivity, high magnetic energy and other excellent properties at ultra-high temperature and can be suitable for ultra-high-temperature environments with the temperature of 550 DEG C or above.

The invention discloses a method for preparing high-magnetic energy product high-coercive force low-cost sintered neodymium iron boron (NdFeB). The method comprises the following steps of: throwing raw materials into a rapid coagulating furnace and smelting in the protective atmosphere of inert gases or nitrogen, and pouring smelting liquid onto a copper roller at a roller speed of 2 to 4m/s to form a rapid coagulating thin strip with the mean thickness of 0.1 to 0.3mm; performing hydrogen breaking and jet milling to obtain magnetic powder with the superficial area mean particle size of 1.5 to 3 mu m, and orientating and molding the magnetic powder in a magnetic field to obtain a blank; and finally, sintering, cooling and ageing to obtain a sintered NdFeB magnet with the mean grain size of 5 to 6 mu m. Compared with the conventional preparation method, by optimizing the rapid coagulating process and combining the adjustment of raw materials, the preparation method makes NdFeB columnar crystals reduced during smelting; therefore, the superficial area mean particle size of the magnetic powder is reduced in the process of performing jet milling, the mean grain size of the sintered NdFeB magnet is reduced finally, and the coercive force of the sintered NdFeB magnet is improved. Therefore, the preparation method is suitable for preparing a high-magnetic energy product and low-cost high-coercive force magnet.

The high stability and high magnetism quenched R-Fe-B base permanent magnetic alloy powder has the basic expression of RxFe100-x-y-z-vMzCovBy, where R is light RE element(s) Nd, Pr and La, and M is element(s) of Nb, Zr, Ti, etc; and consists of main R2Fe14B phase and small amount of superfine auxiliary Fe-alpha-M-beta phase. Adding Nb and other transition elements to form small amount of superfine auxiliary Fe-alpha-M-beta phase during fast solidification can inhibit over nucleation and growth of Nd2Fe14B crystal grain, improve the performance of the quenched material, fine the Nd2Fe14B crystal grain and raise the temperature stability and antioxidant process of the material. In addition, the permanent magnetic alloy powder has obviously raised intrinsic coercive force, high saturated magnetization, high residual magnetism and other advantages.

This invention relates to magnetic material field and especially to a process method improvement and its formula to hexagonal magnetic lead ferrite powder and sinter magnetism, wherein the said magnetism or magnetic powder has one-Curie temperature with A,R, B and Fe hexagonal ferrite main phase and the following molecular formula: A1-XRx[(Fe3+aFe2+b)12-yBy]zO19, through adding positive three Co and optimizing the formula and improving the magnetism crystal aeolotropism constant K1.

A vacuum smelting furnace with quick setting-up function is composed of vacuumizing system, vacuum case of furnace, induction heating coil, crucible, tundish, rotary wheel, and the drum with internal spiral plate and external cooler wrapping it. It can be used to prepare permanent-magnet RE Nd-Fe-B alloy material and hydrogen-bearing RE alloy material. Its advantages are quick and uniform cooling, good microstructure, and high performance.

The invention discloses composite coating equipment and a manufacturing method for a neodymium iron boron rare-earth permanent magnetic device. The coating equipment comprises a vacuum chamber, a cylindrical rotary cathode magnetron target, a planar cathode magnetron target, a cylindrical or rectangular cathode multi-arc ion target, an anode layer linear ion source, a rotating stand and a charging basket. When the coating equipment works, the rotating stand revolves in the vacuum chamber, and rotating shafts at two ends of the netlike charging basket are arranged on the rotating stand, namely that the rotating stand rotates automatically along with revolution. The cylindrical rotary cathode magnetron target is arranged in the rotating stand in the vacuum chamber; the planar magnetron target, the multi-arc ion target, the anode layer linear ion source and a heating device are arranged around the rotating stand in the vacuum chamber; a composite coating is divided into three layers, wherein the first layer is a magnetron sputtering coating of which the thickness is 0.1-5mu m, the second layer is a magnetron sputtering and multi-arc mixed coating of which the thickness is 1-15mu m, and the third layer is a magnetron sputtering coating of which the thickness is 0.1-5mu m. The composite coating is used for a surface treatment procedure of the rare-earth permanent magnetic device, so that the corrosion resistance of the rare-earth permanent magnetic device is improved, and the magnetic performance of the rare-earth permanent magnetic device is also improved.

An additive to be used for raising the residual magnetism of ferrite in permanent magnetism adds an additive of raising the residual magnetism with the molecular formula of MxSiyO2, where X=1=4, y=0-2, Z=2-6 in addition to add calcium carbonate and 1-4 additives of kaolin silica, aluminium oxide and boracic acid to increase its coercive force in the secondary process during production course of strontium ferrite or barium ferrite, where X, Y and Z can be decimal and M is one or more kinds of mixtures of Fe, Pr, Nd, Mn, Sr and C. With the same raw material, by use of the additive of MxSiyO2 ofthe present invention, the residual magnetism can be raised by 50-150 Gs based on 3600-4100 Gs.

The invention relates to a preparation method of samarium-cobalt (SmCo) system sintered materials. The preparation method comprises the steps of alloy smelting, alloy cast strip preparation through rapid quenching, magnetic powder preparation through combination of a hydrogenated disproportionation method and an airflow grinding method, orientation and forming, positive pressure sintering and solid dissolving and aging treatment. The preparation method has the advantages that through the innovation of the ingot casting and powder making process, the microstructure of a magnetic body is optimized to the greatest degree, the magnetic body mainly consists of columnar crystals, the orientation is easy, and in addition, the performance of the magnetic body is stable; and in the hydrogenated disproportionation process of alloy cast sheets, hydrogen enters gap positions in SmCo crystal lattices, and the crystal lattice expansion is caused, so the pulverization is realized under the condition of ensuring the crystal particle integrity, the oxidation in the powder making process is reduced, the magnetic body with low oxygen content is obtained, and the magnetic performance of the magnetic body is ensured.

The invention relates to the metallurgy field and discloses novel samarium-cobalt-base nano-composite permanent magnetic material. The samarium cobalt base is (Sm, R)1(Co, Fe, Cu, Zr)7 in type and comprises a TbCu7 type structure, and Co is partially replaced by Fe, Cu and Zr; Re is any one of heavy rare earth Lu, Dy and Tb and partially replaces Sm. The preparation method includes steps that 1) mixing raw materials of the samarium cobalt base according to proportion, and smelting to obtain a 1: 7 type samarium cobalt base alloy ingot; 2) ball milling the alloy ingot through a high-energy ball milling technique, mixing with Fe powder according to proportion, and performing high-energy ball milling to obtain nanocrystalline composite magnetic powder; 3) carrying out annealing heat treatment on the nanocrystalline composite magnetic powder. According to the samarium-cobalt-base nanocrystalline permanent magnet material and the preparation method thereof, the soft/hard-magnetic phase composite magnetic powder is prepared through the high-energy ball milling, laser heat treatment and other techniques, a high magnetic energy product is obtained through exchange coupling between the nanocrystalline hard magnetic phase and nanocrystalline soft magnetic phase, and meanwhile, because rare-earth Fe phase is not used, the cost is lowered, and the operation technique is simplified.

The invention discloses a hybrid film coating method of a neodymium iron boron rare earth permanent magnet device. According to the method, firstly, alloy smelting is carried out, alloy in a molten state is cast onto a rotary copper roller with a water cooling effect for being cooled to be manufactured into an alloy sheet, then, the alloy sheet is subjected to hydrogen decrepitation, material mixing and airflow powder grinding, next, materials are mixed by a material mixing machine and are then sent to a nitrogen gas protection magnetic field orientation pressing machine to be formed, the mixed materials are subjected to isostatic pressing after being encapsulated in a protection box, then, the sintering and the aging are carried out, a neodymium iron boron rare earth permanent magnet blank is prepared, the blank is subjected to machining, a neodymium iron boron rare earth permanent magnet is prepared, next, the neodymium iron boron rare earth permanent magnet is subjected to film coating, the neodymium iron boron rare earth permanent magnet device is formed, the film coating comprises three layers, the first layer and the second layer are magnetron sputtering coatings, and the second layer is a magnetron sputtering and multi-arc ion plating hybrid coating. The hybrid film coating is adopted as a surface treatment work procedure of the rare earth permanent magnet device, the anti-corrosion capability of the rare earth permanent magnet device is improved, and meanwhile, the magnetic performance of the rare earth permanent magnet device is also improved.

The invention relates to a Pr/Nd-based two-phase nano-composite permanent magnet material and a method for the preparation of the block body thereof. The invention comprises the composing general formula of the two-phase nano-composite permanent magnet material: a (Pr, Nd)-Fe-R-Ti-QB system, wherein Pr and Nd are main rare earth components in hard magnetic phase (Pr, Nd)2Fe14B base material; R is one or more than two of Nb, Dy, Tb and Ga; Q is one or more than two of V, Mo, Zr, W and Au; the molar fraction is as follows: x is more than or equal to 4 and less than or equal to 11, y is more than or equal to 0.1 and less than or equal to 3, z is more than or equal to 0.1 and less than or equal to 4, m is more than or equal to 0 and less than or equal to 2, n is more than or equal to 6 and less than or equal to 10, w is more than or equal to 20 and less than or equal to 80, and the balance being Fe. The preparation of the block body (Pr, Nd) 2Fe14B/Alpha-Fe comprises the following steps of (1) smelting master alloy; (2) fast quenching of thin strips; (3) preparing the block body by ultra-high heat pressing, in which the thin strip alloy is put in a graphite mold and then is placed in an ultra-high pressure device, and is sintered for 1 to 30min when the temperature is heated to between 500 and 1000 DEG C at 10-50 DEG C/min, under the pressure intensity of between 1 and 12 GPa and Ar gas protective environment. The Pr/Nd-based two-phase nano-composite permanent magnet material has the advantages of low-content rare earth, low cost, good anti-saturation effect, and the like; the magnetic energy is more than 180 kJ/m3, and the density is more than 74.5 g/cm3.

Using specific technique of rapid hardening slice produces alloy based on neodymium (or praseodymium) iron. Then, through reaction of gas-solid phase, crumbling procedure produces RxFe100-x-y-zMyIz magnetic powder. The magnetic powder is single crystal grain in sheet form with average grain size as 1-3 micro. The magnetic powder produced by the disclosed technique possesses anisotropy of magnetocrystalline under action of external magnetic field as well as rolling anisotropy and stress anisotropy. Based on three kinds of anisotropy, the invention discloses method for preparing high performance flexible rubber magnet with rolling anisotropy. The prepared flexible magnet possesses excellent magnetism, flat surface, good cohesiveness, and feasible mechanical properties including tensile strength, extensibility, and rigidity as well as characteristics of temperature resisting, moisture resistance, oil proof and anticorrosion.

The invention relates to a method for preparing a high-coercivity SmCoFeCuZr (samarium-cobalt-ferrum-copper-zirconium) high-temperature permanent magnet by doping nano-Cu powder, which belongs to the technical field of rare-earth permanent magnetic material preparation. The method comprises the steps of: smelting a SmCoFeCuZr alloy ingot by the conventional powder metallurgy method; processing the SmCoFeCuZr alloy ingot to micrometer-level alloy powder; uniformly blending commercial nano-Cu powder and the SmCoFeCuZr alloy powder according to a ratio; sintering; and aging to obtain a 2:17 SmCosintered magnet. The doped nano-Cu powder has uniform distribution in the sintered magnet, so that the room-temperature and high-tempreature coercivity of the magnet can be improved greatly. The room-temperature coercivity can be improved by 2 to 2.5 times, and the 500 DEG C coercivity and magnetic energy of the magnet doped with the nano-Cu powder are significantly higher than those of undoped magnets. Accordingly, the magnet doped with the nano-Cu powder is very suitable for application in high-temperature environment.

The invention discloses a heat treatment process for sintered nd-fe-b, which comprises the following steps: 1) primary tempering: carrying out first-time heat treatment on sintered nd-fe-b magnets subjected to sintering under the conditions of 4-8*10<-3>Pa and 900-1000 DEG C; 2) secondary tempering: carrying out second-time heat treatment on the sintered nd-fe-b magnets under the conditions of 4-8*10<-3>Pa and 650-750 DEG C; and (3) tertiary tempering: carrying out third-time heat treatment on the sintered nd-fe-b magnets under the conditions of 4-8*10<-3>Pa and 500-600 DEG C. According to the technical scheme of the invention, nd-fe-b magnets are subjected to heat treatment by using a heat treatment method implemented through tertiary tempering treatment, the coercivity or remanence of nd-fe-b magnets are further improved through controlling the pressure and the time in the process of heating, and then the magnetic energy product of the sintered nd-fe-b magnets is increased, thereby achieving the purpose of improving the magnetic property of the magnets.

The invention discloses a method for preparing low-cost sintered neodymium (Nd) iron (Fe) boron (B) by doping lanthanum (La) cerium (Ce), and the method comprises following steps of (1) utilizing a quick-hardening sheet vacuum sensing smelting furnace to smelt a NdFeB material and to prepare a NdFeB alloy sheet with thickness of 0.3 to 0.5mm; (2) utilizing a hydrogen broken furnace to pulverize the NdFeB alloy sheet to NdFeB alloy powder of 110 to 150 micrometers; (3) grinding the obtained powder into NdFeB alloy powder of 3.5 to 4.5 micrometers through the airflow; (4) adding the LaGe alloy powder into the powder to be uniformly mixed; (5) utilizing a magnetic field press machine to orient and form the powder under the magnetic field, and acquiring pressed blank with density of 4.6 to 4.8 g/cm<3> through isostatic cool pressing; (6) placing the pressed blank into a vacuum sintering furnace to be sintered, and ensuring the sintered magnet of (PrNdGd)2936 to 29.65(LaCe)0.99 to 1.96(FeCoAlCu)67.63 to 68.3B1.05 to 10.6. The LaGe powder which is processed by special process is added to substitute rich neodymium phase in the NdFeB, so that the LaCe can be prevented from being excessively mixed with the NdFeB mani phase to influence the magnetic performance, and an effect for improving the product performance and reducing the product cost can be realized.