44results about How to "Magnetic homogeneity" patented technology

Non-oriented electrical steels are widely used as the magnetic core material in a variety of electrical machinery and devices, particularly in motors where low core loss and high magnetic permeability in all directions of the strip are desired. The present invention relates to a method for producing a non-oriented electrical steel with low core loss and high magnetic permeability whereby the steel is produced from a steel melt which is cast as a thin strip or sheet, cooled, hot rolled and/or cold rolled into a finished strip. The finished strip is further subjected to at least one annealing treatment wherein the magnetic properties are developed, making the steel strip of the present invention suitable for use in electrical machinery such as motors or transformers.

Aspects are directed to recording media with enhanced magnetic properties for improved writability. Examples can be included or related to methods, systems and components that allow for improved writability while reducing defects so as to obtain uniform magnetic properties such as uniformly high anisotropy and narrow switching field distribution. Some examples include a recording medium with an exchange tuning layer inserted between the hard layer and the soft, semi-soft or thin semi-hard layer so as to maximize the writability improvement of the media. Preferably, the exchange tuning layer is granular and reduces or optimizes the vertical coupling between the hard layer and the soft, semi-soft or semi-hard layer of a magnetic recording or storing device.

The invention discloses a magnetic plastic composite material. The magnetic plastic composite material includes the following components, by mass, 4-8 % of nylon 6 powder, 90-95% of neodymium iron boron magnetic powder, 0-5% of caprolactam, 0.5-1.5% of lubricant and 0.3-1% of silane coupling agent. The invention further discloses a magnetic plastic composite material preparation method. The magnetic plastic composite material is good in strength due to the fact that content of the neodymium iron boron magnetic powder reaches 90-95%. Through fully mixing of the neodymium iron boron magnetic powder and the nylon 6 powder, the neodymium iron boron magnetic powder is even in distribution and magnetism. Therefore, the magnetic plastic composite material can be more stable in quality.

The invention discloses a preparation method of a nanofiber aerogel material with hard magnetism, and belongs to the field of nanofiber functional materials. The preparation method comprises the following steps: 1) preparing demagnetized composite particles; 2) blending the demagnetized composite material and cellulose acetate butyrate, performing melting extrusion and extracting to prepare composite nanofiber; 3) dissolving the composite nanofiber by using a solvent, mixing with a bonding agent, freezing and drying to prepare a composite nanofiber aerogel; 4) magnetizing the composite nanofiber aerogel. The preparation method is simple in process and pollution-free, and is suitable for industrial production; the prepared hard-magnetism aerogel has the advantages of superparamagnetism and relatively high strength, has the characteristics of a high specific surface area, high porosity, low heat conductivity and the like, and can be widely applied to the fields of air filtration, electromagnetic shielding, energy absorption and the like.

The invention discloses a manufacturing method for high-magnetic induction low-cost 250 MPa cold-rolled magnetic pole steel. The manufacturing method comprises the steps as follows: heating a plate blank to be 1200-1260 DEG C and insulating; hotly rolling, wherein the final rolling temperature is 850-900 DEG C, the coiling temperature is 550-630 DEG C and a jet water cooling way is adopted as a cooling way; cooling to be 60-80 DEG C for acid washing, wherein an air cooling way is adopted as the cooling way; coldly rolling, wherein the cold rolling reduction rate is 50-75%; continuously annealing, wherein the temperature of an uniform heating section is 720-780 DEG C and the uniform heating time is 60-200 s; and flattening by a flattening elongation rate of 0.8-1.4% to prepare the 250 MPa cold-rolled magnetic pole steel. The produced magnetic pole steel has lower yield strength ReL of more than 250 MPa and magnetic induction strength B50 of more than 1.70 T, and is suitable for manufacturing a magnetic pole iron core of a rotor body of a large water-wheel generator.

The invention relates to a method for producing high-magnetic-induction oriented silicon steel by continuous casting and rolling of a thin slab. The method comprises the following steps of: smelting and performing continuous casting and rolling of the thin slab; dephosphorizing the casting blank by using high-pressure water for the first time; performing soaking; dephosphorizing for the second time; performing finish rolling; normalizing and then cooling to below 100 DEG C; performing cold rolling to reach the thickness of finished products; continuously decarburizing and annealing; permeating N2; coating a magnesium oxide parting agent and annealing at high temperature; and stretching flatly and coating an insulating layer. By the method, manufacturing cost is low; the defects that the surface of a steel plate is mixed with impurities and overlapped with skin and the like can be overcome; magnetic performance is stable; and the continuous casting process is loose.

The invention discloses a neodymium iron boron magnet sintering method and a special device thereof, and belongs to the technical field of rare earth magnet materials. The sintering method is characterized in that magnets are sintered by the aid of a rotary sintering furnace, the sintering method includes the steps: feeding; placing magnet into the furnace; magnet sintering. The sintering method solves the problems that different positions of a traditional sintering furnace have temperature deviations, density of the sintered blanks at different positions is nonuniform, and the uniformity of the magnetic performance of the sintered blanks is poor. The method is high in applicability and can meet sintering and forming of neodymium iron boron pressed blanks with different specifications.

The invention discloses a rare earth permanent magnet material and a preparation method and application thereof. The raw material composition of the rare earth permanent magnet material comprises thefollowing components in percentage by mass: 28.5-33.0% of R, 0.5%-1.8% of Ga, but not 0.5 wt% of Ga, 0.84%-0.94% of B, 0.05 to 0.07% of Al, and <=2.5% but not 0 of Co, 62-69% of Fe; N is one or moreof Ti, Zr and Nb; when N contains Ti, the content of Ti is 0.15%-0.25%; when N contains Zr, the content of Zr is 0.2%-0.35%; when N contains Nb, the content of Nb is 0.2%-0.5%; and the percentage is the mass percentage of each component in the total mass of the raw material composition. The rare earth permanent magnet material has better magnetic properties (residual magnetism, coercive force, squareness and temperature stability), and the magnetic properties of the same batch of products are uniform.

The invention provides a manufacture method of a permanent magnet. The manufacture method comprises the following step of: arranging permanent magnet alloy powder in a forming mold in an alternating magnetic field which is provided with a positive magnetic field and a negative magnetic field, for orientation and compression, wherein the alternating magnetic field is generated by an alternating current which is input into coils; the alternating current has constant amplitude and frequency; and the frequency of the alternating current is in a range of 0.1-100 Hz in different orientation and compression processes. The invention has the advantages of uniform orientation degree, low equipment cost, low energy consumption, long service life, high production efficiency and the like.

The invention discloses a neodymium iron boron material and a preparation method and application thereof. The raw material composition of the neodymium iron boron material comprises the following components by mass: 28.5-34% of R; R is a rare earth element and comprises Nd; 0.84%-0.94% of B; Cu: 0.45 < Cu < = 2%; Co: < = 2.5%, but not 0; Fe: 61 to 69 %; N, containing one or more of Ti, Zr and Nb.When N contains Ti, the content of Ti is 0.15%-0.25%. When N contains Zr, the content of Zr is 0.2%-0.35%. When N contains Nb, Nb is 0.2%-0.5%; wherein the percentage is the mass percentage of each component in the total mass of the raw material composition. According to the neodymium iron boron material, on the premise of not adding heavy rare earth elements, the neodymium iron boron material which is good in magnetic performance and uniform in magnetic performance in the same batch can still be prepared by adopting a low-boron aluminum-free system.

The invention discloses a neodymium iron boron material and a preparation method and application thereof. The raw material composition of the neodymium-iron-boron material comprises the following components in percentage by mass: 28.5-33.0% of R and the balance of Fe and inevitable impurities, r is a rare earth element at least containing Nd; 0.45%-2% of Cu, but not 0.45% of Cu; b: 0.84%-0.94% ofthe total weight of the raw materials; 0.05 to 0.07% of Al; co: < = 2.5% but not 0; 62 to 70 percent of Fe; n is one or more of Ti, Zr and Nb; when N contains Ti, the content of Ti is 0.15%-0.25%; when N contains Zr, the content of Zr is 0.2%-0.35%; when N contains Nb, the content of Nb is 0.2%-0.5%; wherein the percentage is the mass percentage of each component in the total mass of the raw material composition. The neodymium iron boron material is good in magnetic performance, and the magnetic performance of products of the same batch is uniform.

The invention provides a flow channel device capable of extruding out a plurality of rare earth magnets once for an extruding machine, and a method for preparing the plurality of the rare earth magnets extruded out once by the extruding flow channel device. The flow channel device comprises a device main body (1), a core rod (2), a cooling pipe (3), a cooler (5), a main heat flow channel (6), a plurality of branched heat flow channels (7), temperature sensors (8) and (12), and a mixing material inlet (9). The flow channel device can efficiently obtain novel rare earth magnets which have even texture, uniform magnetic property, high dimension precision in the length direction and good corrosion resistance without conicity and needle eyes.

The invention discloses a rotary position sensor, which belongs to the technical field of position sensing, and is characterized by comprising a front shell, a rear shell and a controller, the front shell comprises a base block, a cylinder part, a supporting block and two arc-shaped plates; the end face of the side, close to the rear shell, of the supporting block is fixedly connected with a convex fixed ruler. The bottom surface of the convex fixed ruler is connected with a concave sliding ruler in a sliding manner; a rotating body and a linkage body are embedded in the inner wall of the cylinder part; one end of the linkage body is joggled with the rotating body, the other end of the linkage body is fixedly connected with a screw rod, the outer wall of the screw rod is sleeved with a nut, and the outer wall of the screw rod is meshed with the inner wall of the nut; a round groove is formed in the end face of the side, away from the linkage body, of the nut, an L-shaped rod is movably connected into the round groove, and the top end of the L-shaped rod is fixedly connected with the concave sliding ruler. The device is mainly used for multi-gear rotary input or a multi-gear rotary switch, can freely and continuously rotate, is simple in structure, reliable in operation and accurate in measurement, and can effectively eliminate temperature influence so as to realize long-term use.