Title :
The effects of additive elements and hydrogen pressure on the behaviour of hydrogen in Nd-Fe-B type alloys
Author :
Kim, Yoon B. ; Jeung, W.Y.
Author_Institution :
Div. of Metals, Korea Inst. of Sci. & Technol., Seoul, South Korea
fDate :
9/1/1997 12:00:00 AM
Abstract :
In this study, the hydrogen absorption and desorption behaviour of Nd-Fe-B type alloys with the addition of Co and Ga, and hydrogen pressure was investigated. The starting temperature of hydrogen absorption into Nd-rich and Nd2Fe14B phases is shifted to higher temperature by the addition of Co and Ga. The most distinct effect of Co and Ga additions on hydrogen absorption and desorption behaviour in Nd-Fe-B type alloys is the lowering of the occurring temperature of the recombination reaction. The initial hydrogen pressure also affects the hydrogen absorption and desorption behaviour. The disproportionation reaction which occurred was sluggish at low hydrogen pressure and the occurring temperature of the recombination reaction is lowered by decreasing the initial hydrogen pressure
Keywords :
boron alloys; cobalt alloys; desorption; ferromagnetic materials; gallium alloys; hydrogen; iron alloys; neodymium alloys; permanent magnets; powder metallurgy; sorption; Co addition; Ga addition; Nd-Fe-B; Nd-Fe-B type alloys; Nd-Fe-B-Co-Ga-H; Nd-rich phases; Nd2Fe14B phases; additive elements; disproportionation reaction; higher temperature; hydrogen absorption; hydrogen desorption; hydrogen pressure; occurring temperature; recombination reaction; starting temperature; Absorption; Additives; Bonding; Cobalt alloys; Gallium alloys; Heat treatment; Hydrogen; Magnetic anisotropy; Powders; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
