Nd-Fe-B系永久磁石合金の水素粉砕挙動 Behaviours of Hydrogen Decrepitation in R-Fe-B Type Permanent Magnet Alloy
The powder metallurgical process has been used to produce Nd-Fe-B sintered permament magnet. Therefore, fine magnetic powders (3-4 μm) are required to be pulverized from Nd-Fe-B casting alloy. At present, a combination of hydrogen decrepitation(HD) and mechanical milling has been applied to make fine powders efficently. In our previous work, the fundamental hydrogen absorbing mechanism into Nd-Fe-B alloy was successfully studied by using P-C-Tequipment. In this paper, the influences of both the hydrogen absorbing conditions and the alloy conditions. Le. chemical composition, microstructure, and crystalline size, on the hydrogen decrepitation of Nd-Fe-B alloy were investigated in terms of H/M, and the basic mechanism of decrepitation processes related with the hydrogen absorbing conditions was revealed.
粉体および粉末冶金 44(1), 90-95, 1997-01-15
Japan Society of Powder and Powder Metallurgy