55results about How to "Increase the maximum energy product" patented technology

The invention relates to a sintered magnet motor. In conventional technology, there is no example in which the maximum energy product of a Nd2Fe14B sintered magnet is increased and the remanent magnetic flux density is made variable, and it is difficult to provide a variable magnetic flux motor using a sintered magnet of one kind. The sintered magnet motor includes a rotor, a stator, and coils. Sintered magnets are disposed on the rotor. In the sintered magnet motor, a residual magnetic flux density of each of the sintered magnets is controlled by a magnetic field generated by a coil current.

The present invention is a ferromagnetic particle powder constituted of 70% or more Fe16N2compound phase according to the Mossbauer spectrum. Specifically, the present invention relates to a ferromagnetic particle powder characterized by containing one or more metal elements (X) selected from Mn, Ni, Ti, Ga, Al, Ge, Zn, Pt, and Si in a molar ratio to Fe of 0.04 - 25% and having BHmax for the ferromagnetic particle powder of 5 MGOe. The present invention further relates to a method for producing the same and an anisotropic magnet and bonded magnet in which this ferromagnetic particle powder is magnetically oriented. This ferromagnetic particle powder can be produced industrially and is a Fe16N2 particle powder that contains a different metal element having a large BHmax.

The invention discloses a method for preparing sintered NdFeB with low dysprosium (Dy) content and high performance; the method comprises the following steps of: sputtering and plating the Dy element on the surface of jet mill powder by using the powder plate technology based on magnetron sputtering on the basis of preparing NdFeB powder, and then sufficiently dispersing the Dy element to micron-sized NdFeB crystal particles by dispersing the Dy element at high temperature in the sintering and tempering process, thereby achieving the effect of improving magnetic performance of the sintered NdFeB. Compared with the introduction of the Dy element in the proportioning process of the prior art, the method disclosed by the invention has the advantages: the low dysprosium content and high performance is limited in the nano-size by adopting the physical gas-phase deposition, the consumption quantity of the Dy element during the production process is controlled effectively and the preparationof sintered NdFeB with low dysprosium content and high performance is realized. Compared with the sintered NdFeB of the same components prepared by the traditional casting and powder metallurgy process, both the intrinsic coercivity and the maximum magnetic energy product of the sintered NdFeB rare-earth permanent magnetic material obtained according to the invention are improved obviously; compared with the sintered NdFeB with the same performance prepared by the traditional casting and powder metallurgy process, the dosage of the dysprosium element is reduced remarkably. The method can be widely applicable to producing and manufacturing sintered NdFeB with high performance.

The invention discloses a high-coercivity and high-stability neodymium iron boron magnet and a preparation method based on crystal boundary reconstruction. The preparation method comprises the steps of separating design and preparation of main alloy and crystal boundary phase alloy powder, nano-modification of crystal boundary phase, powder mixing, magnetic field profiling, isostatic pressing, sintering and thermal treatment. According to the high-coercivity and high-stability neodymium iron boron magnet and the preparation method is based on crystal boundary reconstruction and combines with a rich heavy rear earth novel crystal boundary phase and nano-modification technology, namely the rich heavy rare earth novel crystal boundary phase is redesigned and synthesized, in the process of magnetic sintering and tempering, magnetic hardening is achieved through spread of the heavy rare earth element to the boundary layers of the principle phase crystal grain, and thus a high-coercivity magnetic is prepared under the condition that no or less heavy rear earth is added in the principle phase. Meanwhile the distribution of the crystal boundary and the form of the crystal grain boundary are optimized through a nano-modification method, a pinning domain wall restrains counter magnetic field nucleation and crystal grain growth, and thus high coercivity and high stability of the neodymium iron boron is achieved. The high-coercivity and high-stability neodymium iron boron magnet and preparation method based on crystal boundary reconstruction is simple in process, low in cost and suitable for large-scale volume production.

The invention discloses a high-speed press forming method for an anisotropic binder-free neodymium iron boron magnet. The method comprises the following steps and the following process conditions of: (1) lubricating a mold wall; (2) filling magnetic powder in a mold cavity, then placing the mold cavity into a pulsed magnetic field with magnetic field intensity of 1.0 to 1.5 T and frequency of 0.02 to 0.1 Hz to perform orientation, and applying a pressure of 20 to 30 MPa to prepress at the same time; and (3) heating the mold to 130 to 150 DEG C and then performing press forming at the high speed of 10 to 17 m / s. The method has the advantages of realizing low-cost short-process near-net shape forming, along with simple process, high practicability and low cost. Compared with the neodymium iron boron magnet, the produced neodymium iron boron magnet has the advantages that the green body density is increased by 0.43 to 0.93 g / cm<3>, the remanence is increased by 0.2 to 0.54 T, the maximummagnetic energy product is increased by 20 to 60 kJ / m<3>, the coercive force Hcb is increased by 73 to 348 kA / m and Hci is increased by 80 to 387 kA / m.

The invention discloses a high-performance magnetic ring based on engineering plastics as a carrier, which includes a ring-shaped engineering plastic layer containing ferrite materials and a metal ring skeleton, and the ring-shaped engineering plastic layer is wrapped in the metal ring through an injection molding process of an injection molding machine On the skeleton, the metal ring skeleton is a "T" or "half T" shaped metal ring skeleton, and the chamfer at the lower part is the inner diameter of the assembly; the ring-shaped engineering plastic layer containing ferrite material is injected by an injection molding machine Immediately after orientation, demagnetization, machining and re-magnetization of the magnetic powder in all directions, it can continuously emit signals perpendicular to the N / S pole phase of the engineering plastic layer. The patent of this invention mainly solves the problems of ozone resistance, aging resistance, oil resistance, chemical corrosion resistance, and poor impact resistance of the magnetic ring with NBR as the main rubber and plastic material as the base material. In addition, the residual magnetism, maximum magnetic energy product, The magnetic properties such as intrinsic coercive force have been greatly improved.

The invention discloses a preparation method of a 2:17 type SmCoCuFeZrB sintered permanent magnet. The preparation method is used for preparing the sintered permanent magnet Smx (Co1-a-b-c-dFeaCubZrcBd)z, the symbols x, a, b, c, d and z in the formula represent the composition range of limited elements, and the atomic number ratio of x to a to b to c to d to z is 1: (0.01-0.4): (0-0.03): (0.01-0.05): (0.01-0.04): (6.8-8.4); and the magnet has a cellular organization structure, and an intracellular main phase is an Sm2 (CoFe) 17B phase. The density and orientation degree of the sintered permanent magnet prepared by the method are incomparable to those of a nanocrystalline magnet and an amorphous magnet; and through cooperation of a heat treatment process, an oxygen control process and the like, uncontrolled phase decomposition of the magnet in the heat treatment process is effectively inhibited, effective regulation and control of a microstructure and phase composition are achieved, the addition amount of Fe elements in the sintered 2:17 type samarium-cobalt magnet is increased, the intrinsic coercive force of the magnet under the high Fe content is improved, and the maximum magnetic energy product of the sintered 2:17 type samarium-cobalt magnet is further improved.

The invention discloses a method for preparing a high-performance permanent magnet ferrite. The steps are: (1) batching: mixing the main component and a primary additive; (2) mixing: mixing the prepared raw materials through dry mixing (3) pelletizing: pelletize the mixture to obtain pellets with a diameter of 5-12 mm; (4) pre-sintering: sinter the pellets at 1290-1390°C for 1.5-2.5 hours to obtain pre-sintered pellets; (5 ) Secondary grinding: After crushing the calcined material into coarse powder, it is mixed with secondary additives and wet ball milled to obtain fine slurry. The secondary additives include calcium carbonate, silicon dioxide and clinker calcined powder; (6) Sintering: the fine slurry is wet-pressed and then sintered to obtain the high-performance permanent magnet ferrite. The invention uses a dry process to mix materials, which reduces the cost of the process, and adds clinker pre-calcined powder to the secondary additive to obtain a permanent magnet oxide with high remanence, intrinsic coercive force and maximum magnetic energy product. body.

An explosion method for shaping the adhered dual-phase nano-crystalline anisotropic NdFeB magnet includes such steps as loading the isotropic NdFeB magnet powder in sleeve steel cylinder, treating by magnetic field, fixing the sleeve steel cylinder onto base with an explosive tube on it, filling explosive in the tube, and exploding. Its advantages are high density and high magnetic performance.