Sintered NdFeB Magnets
Known as third generation of Rare Earth magnets, Sintered neodymium-iron-boron magnet (also known as Neodymium, Neodym, NdFeB, or Neo magnet) is the most widely used type of rare-earth magnet, which is made from an alloy of neodymium, iron, and boron. neodymium magnet is the most powerful commercialized permanent magnets available today, with maximum energy product ranging from 30 MGOe to 52 MGOe, very high remanence and coercivity.
With excellent magnetic properties, abundant raw material and reasonable price, Sintered NdFeB Magnet is used as an ideal magnet in mini motor, permanent magnet instrument, electronics industry, automotive industry, petrochemical, magnetic resonance imaging,sound device, magnetic suspension system, magnetic transmission machine and medical apparatus etc.
For NdFeB, if let it exposed, the iron in the magnet will rust. To protect the magnet from corrosion, it is usually preferable for the magnet to be coated. There are a variety of options, but nickel is the most common and usually preferred. Some other options for coating are zinc and epoxy etc.
Bonded NdFeB Magnets
Bonded NdFeB magnet is produced by molding compression of the compound NdFeB alloy powder with epoxy resin, also it can be made by injection or extrusion from NdFeB alloy powder mixed with plastic.
The characteristics are as follows:
1、Higher Magnet Property: the magnet property of bonded NdFeB magnet is between that of sintered NdFeB and ferrite, and with good consistency and stability.
2、Large Freeness of Product Shapes and High Precision of Dimension: the magnet shape and dimension are decided by the tooling, like ring, segment, block, etc., without further sintering and mechanical machining processes.
3、Good Corrosion Resistance: after electrodeposited or through other special treatments, it can be used under normal or unfavorable environment conditions for a long time.
4、Diverse magnetization: Multi-pole magnetization and screw angle magnetization are available, and the field distribution could be square, sinusoid and so on.
5、It has high production efficiency, suitable for mass production.The bonded NdFeB magnet is mainly used for all kinds of micro–miniature motors, such as spindle motor, stepping motor, synchronous motor, DC motor and brushless DC motor. It can replace sintered NdFeB magnet and ferrite, making motor assembling simpler and more reliable, reducing costs and improving efficiency.
Sintered SmCo Magnet, a type of rare earth magnet, is a strong permanent magnet made of an alloy of samarium and cobalt. They were developed in the early 1970s. They are generally the second-strongest type of magnet made, less strong than neodymium magnets, but have higher temperature ratings and higher coercivity. They are brittle, and prone to cracking and chipping. Samarium–cobalt magnets have maximum energy products (BHmax) that range from 16 megagauss-oersteds (MGOe) to 32 MGOe, that is approx. 128 kJ/m3 to 256 kJ/m3; their theoretical limit is 34 MGOe, about 272 kJ/m3. They are available in two “series”, namely Series 1:5 and Series 2:17.
SmCo Magnet (Sintered SmCo Magnet) is a high performance, low temperature coefficient permanent magnet with its high working temperature – 350 degree centigrade. When working above 180 degree centigrade, SmCo Magnet (Sintered SmCo Magnet) maximum energy product BH and steady temperature are superior than NdFeB magnetic materials. SmCo Magnet (Sintered SmCo Magnet) needn’t to be coated because it is difficult to be eroded and oxidized.
Sintered SmCo is widely used in motors, watch, transducers, instruments, positional detector, generators, radar communications, medical equipments, various magnetism spreading devices, magnetic processor, electrical engineering and magnetic derrick.
AlNiCo magnet is a kind of high-performance synthetic permanent magnet composing of metallic aluminum,nickel ,ferrocobalt and other metallic elements .According to different production modes,it can be divided into two types：casting and sintering. For casting type ,,different core sizes can be produced ,magnetic energy is high ,temperature coefficient for production is low; for sintering type ,generally ,it is defined as smaller size ,but mechanical strength is higher than casting type.
Compact crystallization ,high strength ,strong resistance to corrosion , composition uniformity ,excellent magnetic performance ,good temperature stability (Br temperature coefficient is the minimum among all kinds of permanent magnets ) maximum working temperature reaches 500℃, sintered magnet can be produced to be small volume ,complicated shape and built-up magnet .
Because of its temperature conditions is excellent (maximum operating temperature up to 500℃) low temperature coefficient ,high hardness and strong strength ,it is broadly applied in generator ,loudspeaker ,measuring instrument and other fields.
It is also known as Ceramic magnet. Magnets are available at a low cost, and has excellent corrosion resistance. This material can be both anisotropic and isotropic.
Anisotropic grades are magnetized in the direction of pressing, finished products with high energy. Isotropic grades are not oriented and can be magnetized in all directions.
Ferrite Magnet( Cereamic Magnets) are widely used in industrial holding applications, Electronic motors, Loudspeakers, Automotive, Security systems, and Medical treatment.
Ferrite magnets can be supplied in Ring, Disc, Cylinder, Block, Bar, Arc Segment, other special shape or size can be manufactured on request.
Flexible magnetic sheet/roll/strip is made by mixing ferrite magnet powder with synthetic rubber or plastic (CPE, NBR etc.). With its excellent flexibility characteristics, It can be easily cut, slit, punched, folded and twisted without damaging magnetic properties. It doesn't contain hazardous chemicals and any harmful composition to people's health.
It is widely made and used to promotional magnets, car sign magnets, advertisement magnets, game magnets, office & stationary magnets, educational magnets, toy magnets and some special holding purpose magnets.
On the non-magnetic side of magnetic sheet, gloss/matt PVC vinyl in any color, self-adhesive(Chinese adhesive, 3M, Tesa etc.), dry wipe finish are able to be laminated, on the magnetic side of magnetic sheet, there's a UV hardened coating to protect the surface.