Samarium Cobalt Sintering

Samarium cobalt magnet is a kind of rare earth magnets, and it is made up of samarium, cobalt and other rare earth metal material proportioning, smelting alloy, after grinding, molding, sintering, then made of a magnetic tool material, with high magnetic energy product, low temperature coefficient. The highest working temperature is 350℃, no negative temperature, in operating temperature above 180℃, its maximum magnetic energy product (BHmax), coercivity, temperature stability and chemical stability exceed the NdFeB permanent magnet material. It has strong corrosion resistance and oxidation resistance. Therefore, it is widely used in aerospace, national defense and military industry, microwave devices, communications, medical equipment, instruments, instruments, various magnetic transmission devices, sensors, magnetic processors, motors, magnetic cranes and so on.

The reduction/melt method and reduction/diffusion method are used to manufacture samarium–cobalt magnets. The reduction/melt method will be described since it is used for both SmCo5 and Sm2Co17 production. The raw materials are melted in an induction furnace filled with argon gas. The mixture is cast into a mold and cooled with water to form an ingot. The ingot is pulverized and the particles are further milled to further reduce the particle size. The resulting powder is pressed in a die of desired shape, in a magnetic field to orient the magnetic field of the particles. Sintering is applied at a temperature of 1100˚C–1250˚C, followed by solution treatment at 1100˚C–1200˚C and tempering is finally performed on the magnet at about 700˚C–900˚C. It then is ground and further magnetized to increase its magnetic properties. The finished product is tested, inspected and packed.

Samarium-cobalt magnet sintering production process: batching → smelting ingot → milling → molding → sintering tempering → magnetic testing → grinding processing → pin cutting processing → finished product.