Title:
MANUFACTURE OF MATERIAL POWDER OF R-TM-B GROUP PERMANENT MAGNET
Document Type and Number:
Japanese Patent JP3151959
Kind Code:
B2
Abstract:
PURPOSE: To reduce oxygen at alloy pulverization for omitting a pulverization process by performing hydrogen occlusion process with a specific produced mixture and performing dehydration process, for removing one or more kinds of alkali metal oxide and alkali earth metal oxide, and also one or more kinds of remaining alkali metal and alkali earth metal.
CONSTITUTION: A rate earth oxide powder, transition metal oxide powder and boron oxide powder are mixed with at least one kind of alkali metal, alkali rare earth metal or hydride or oxide of them. The mixture is heated at 500-850°C in H2O, then, at 900-1100°C in inert gas atmosphere or under vacuum. The produced mixture, thus obtained, is treated with hydrogen and then with hydrogen pulverization for dehydrogenation. Further, Alkali rare earth metal, alkali metal and alkali rare earth metal oxide are removed from the reaction- produced mixture.
More Like This:
Inventors:
Kageyama Kagehiro
Takayoshi Sato
Takayoshi Sato
Application Number:
JP27267592A
Publication Date:
April 03, 2001
Filing Date:
October 12, 1992
Export Citation:
Assignee:
Hitachi Metals Co., Ltd.
International Classes:
B22F1/02; B22F9/04; C22C38/00; H01F1/057; H01F1/06; (IPC1-7): H01F1/06; B22F9/04; C22C38/00
Domestic Patent References:
| JP1289101A | ||||
| JP62261101A |