Hydrogen Reaction with SmCo Compounds: Literature Review

The Hydrogen Decrepitation and the Hydrogen Disproportionation Desorption Recombination processes for the preparation and the recycling of the two industrially produced phases of SmCo alloys, SmCo5 and Sm2Co17, are reviewed. The effects of the chemical composition, the microstructure, the exposure time, the hydrogen pressure, and the temperature on the hydrogen absorption are discussed. The magnetic properties for the SmCo powder after hydrogen absorption are discussed in both the powder form and after preparing sintered or plastic-bonded magnets.