SmCo5 MagnetsSmCo1:5 magnet is also named SmCo5, which is prorated with metallic samarium, cobalt and metallic praseodymium. The (BH) max range is from 16 to 25, maximum working temperature 250°C. The physical character and ductibility of SmCo5 is better than Sm2Co17, so SmCo5 is slightly easier to be machined with complex shapes and thin thickness of disc or ring, while Sm2Co17 is more brittle. Magnetization magnetic field of SmCo5 is lower compared with Sm2Co17. In general, SmCo5 can be magnetized saturated by 4000Gs magnetic field, however, magnetizing Sm2Co17 with high Hcj value need more than 6000Gs magnetic field. For some reasons, the price of SmCo5 is more expensive than Sm2Co17. According to different applications and using requirements, customer can choose SmCo5 or Sm2Co17 reasonably. .A samarium–cobalt (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, by Albert Gale and Dr. Daas, of Raytheon Corporation. They are generally ranked similarly in strength to 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 33 MGOe, that is approx. 128 kJ/m3 to 264 kJ/m3; their theoretical limit is 34 MGOe, about 272 kJ/m3.Attributes-Extremely resistant to demagnetization- Good temperature stability (maximum use temperatures between 250 °C (523 K) and 550 °C (823 K); Curie temperatures from 700 °C (973 K) to 800 °C (1,070 K)- Expensive and subject to price fluctuations (cobalt is market price sensitive)Physical and mechanical propertiesComparison of physical properties of sintered neodymium and Sm-Co magnetsPropertyNeodymiumSm-CoRemanence (T)1–1.30.82–1.16Coercivity (MA/m)0.875–1.990.493–1.59Relative permeability1.051.05Temperature coefficient of remanence (%/K)−0.12−0.03Temperature coefficient of coercivity (%/K)−0.55..–0.65−0.15..–0.30Curie temperature (°C)320800Density (g/cm3)7.3–7.58.2–8.4CTE, magnetizing direction (1/K)5.2×10−65.2×10−6CTE, normal to magnetizing direction (1/K)−0.8×10−611×10−6Flexural strength (N/mm2)250150Compressive strength (N/mm2)1100800Tensile strength (N/mm2)7535Vickers hardness (HV)550–650500–650Electrical resistivity (Ω·cm)(110–170)×10−686×10−6UsesFender is using one of legendary designer Bill Lawrence's latest designs named the Samarium Cobalt Noiseless series of electric guitar pickups in Fender's Vintage Hot Rod '57 Stratocaster. The Samarium Cobalt Noiseless Pickups were used in American Deluxe Series Guitars and Basses from 2004 until Early 2010. In the mid 1980s some expensive headphones such as the Ross RE-278 utilised Samarium Cobalt "Super Magnet" transducers. Other uses include: High-end electric motors used in the more competitive classes in slotcar racing Turbomachinery Traveling-wave tube field magnets Applications that will require the system to function at cryogenic temperatures or very hot temperatures (over 180°C) Applications in which performance is required to be consistent with temperature change Benchtop NMR spectrometersHazardsSamarium–cobalt magnets can easily chip; eye protection must be worn when handling them. Allowing magnets to snap together can cause the magnets to shatter, which can cause a potential hazard. Samarium–cobalt is manufactured by a process called sintering, and as with all sintered materials, inherent cracks are very possible. The magnets do not provide mechanical integrity; instead the magnet must be utilized for its magnetic functions and other mechanical systems must be designed to provide the mechanical reliability of the system.ProductionThe 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 packedMachiningThe alloys are typically machined in the unmagnetized state. Samarium–cobalt should be ground using a wet grinding process (water based coolants) and a diamond grinding wheel. The same type of process is required if drilling holes or other features that are confined. The grinding waste produced must not be allowed to completely dry as samarium–cobalt has a low ignition point. A small spark, such as that produced with static electricity, can easily commence combustion. The fire produced will be extremely hot and difficult to control.