Magnetic Materials R&D Center

Characteristics of Hydrogen Absorption Characteristics of Hydrogen Absorption on RE Magnetson RE Magnets

NdFeB 2-17SmCo

1 0 - 3

1 0 - 2

1 0 - 1

1 0 0

1 0 1

0 0 . 1 0 . 2 0 . 3 0 . 4

Pres

sure

/ M

Pa

wt % H2

1 0 - 3

1 0 - 2

1 0 - 1

1 0 0

1 0 1

0 0 . 1 0 . 2 0 . 3 0 . 4

Pres

sure

/ M

Pa

wt % H2

Magnetic Materials R&D Center

Equipment for Hydrogen Absorption TestEquipment for Hydrogen Absorption Test

Pressure Gage

SUS Container

H2 : 3MPa15MPa

Magnet

Test Conditions

Temp.： 25℃

Pressure：

3MPa、15MPa

Time： 6 days + 7days

Magnetic Materials R&D Center

Hydrogen Exposure Test for RE MagnetsHydrogen Exposure Test for RE Magnets

3MPa,25℃,1day 3MPa, 25℃,3days 3MPa, 25℃,7daysBefore Testing

Nd MagnetWith Ni

（20μm）

2-17SmCo

After Testing

Magnetic Materials R&D Center

Appearances of RE Magnets after the Appearances of RE Magnets after the TestsTests

15MPa,RT6days

Nd MagnetSm Magnet

15MPa,RT6days+7days