Title :
Coercivity enhancement of the Sm2(Fe,Nb)17N x-type materials by twice HDDR processing
Author :
Kwon, H.W. ; Park, S.U.
Author_Institution :
Dept. of Mater. Sci. & Eng., Pukyong Nat. Univ., Pusan, South Korea
fDate :
9/1/1999 12:00:00 AM
Abstract :
In an attempt to achieve finer grain which will improve coercivity in Sm2Fe17Nx-type material, HDDR of Sm 2Fe17-type alloy was done twice before nitrogenation. It has been found that the nitride prepared from this type of HDDR-treated material exhibited a remarkably higher coercivity (around 19 kOe) compared to that from single HDDR-treated material (around 12 kOe). An explanation of the remarkably enhanced coercivity was given with reference to the recombination in more complete form and finer grain size in the material which was processed twice with HDDR
Keywords :
coercive force; desorption; ferromagnetic materials; grain size; hydrogenation; iron alloys; niobium alloys; nitridation; permanent magnets; powder metallurgy; reaction kinetics; samarium alloys; Sm2(Fe,Nb)17Nx-type materials; Sm2(FeNb)17N; Sm2Fe17-type alloy; Sm2Fe17N; coercivity enhancement; finer grain size; grain refinement; homogeneous recombination; nitrogenation; permanent magnet; reaction kinetics; twice HDDR processing; Annealing; Coercive force; Heat treatment; Heating; Hydrogen; Kinetic theory; Magnetic analysis; Magnetic materials; Niobium alloys; Samarium;
Journal_Title :
Magnetics, IEEE Transactions on
