Hydrogen Decrepitation of Sm-Fe Alloy under High-Pressure H₂ Gas

Abstract

Hydrogen decrepitation (HD) method is reported to produce Sm₂Fe₁₇ phase with the particle size of 2-3 mm. Production of fine powder having below 1 mm is difficult with HD method. Present study found that, however, high pressure of hydrogen gas above 3.9 MPa can produce fine powder with the particle size below 150 μm in 90 wt%. The success of producing fine powder is attributed to reduction of hydrogen absorption temperature.