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2 127 923

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C1

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IPC

(21) (22)

Application

97101354/09, 1997-01-27

(22)

Actual filing date

1997-01-27

(45)

Published

1999-03-20

(72)

Inventor

Seliverstov V.P.Chubrin V.A.

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Nauchno-Proizvodstvennoe Ob"Edinenie

PERMANENT MAGNET MANUFACTURING PROCESS Russian patent published in 1999 - IPC

Abstract RU 2127923 C1

FIELD: powder metallurgy; manufacturing alloy base magnets. SUBSTANCE: Nd-Fe-B alloy base permanent magnet is manufactured by molding, sintering, heat treatment in vacuum or in inert medium forming magnetic structure of alloy, grinding, coating with corrosion-preventing oxide layer concurrently with heat treatment to form magnetic structure; procedures are made in inorganic melt containing ion-passivators Cr2O2-7

,NO-3
,NO-2
 at 540-600 C followed by fast cooling in water. EFFECT: simplified procedure, improved corrosion resistance of magnets and, hence, their magnetic properties. 1 tbl

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RU 2 127 923 C1

Authors

Seliverstov V.P.

Chubrin V.A.

Dates

1999-03-20—Published

1997-01-27—Filed

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