Bonded magnet is made through "compression molding" or "injection molding" of the mixture of quick-quenched NdFeB magnetic powder and bonding agent. Due to its high accuracy in size, the bonded magnet may be formed into magnetic components of relatively complicated shapes. The injection molded magnet has a high mechanical strength and may be molded together with other matching parts. In all it is produced with high efficiency, stability and repeatability; Magnet and other part may form together in one step; Free choice of magnetizing direction-especially for multi-polar applications; High dimensional accuracy-large quantity applications with minimum post-press machining; Thin-wall ring and complex shape magnets; High resistance to corrosion. Usually, there are bonded NdFeB magnet and bonded SmCo.

Smco (Samarium Cobalt) magnets are highly resistant to corrosion and require no special surface treatment. This makes SmCO magnets an excellent choice for compact designs where high temperature environments may be required

 Magnetic properties of SmCo bonded magnet by compressing moulding

Two types of SmCo magnets are SmCo5 and Sm2Co17. SmCo5 has the maximum energy products of 18MGOe, comparing with the Sm2Co17 30MGOe, 2-17 composition is also more corrosion resistant and more stable at very high temperature. The maximum working temperature is between 250 centigrade degree to 350 centigrade degree.
SmCo magnets, ab. for Samarium Cobalt Magnets, existed in SmCo5 magnet and Sm2Co17 magnet, are available the designer a tremendous combination of extremely high magnetic properties, outstanding thermal stability and excellent corrosion resistance.
These Characters make SmCo the ideal material in applications like servo-motors, pump couplings, and sensors, particularly where the magnet is required to operate at high temperature, across a broad temperature range of in a corrosive environment.
SmCo magnet is a high performance, low temperature coefficient permanent magnet which made of samarium and cobalt and other rare-earth elements. Its biggest advantage is its hight working temperature---350o C. It needn't to be coated because it is difficult to be eroded and oxidized. SmCo magnet is widely used in motors, watch, transducers, instruments, positional detector, generators, radar, and etc.