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Oriented Barium Ferrite Disc Magnet: Water Instead of a Binder (Gorter, Philips 1956, Ex. 5)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
Charlie

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Charlie

28. Ukwakira 2026DE
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Oriented Barium Ferrite Disc Magnet: Water Instead of a Binder (Gorter, Philips 1956, Ex. 5)

A ceramic magnet from pre-fired barium ferrite powder stirred into water, oriented in a magnetic field in the die, moulded into blocks and fired as in Example 4. In the principal direction it held 2,870 gauss with a coercive force of 1,610 oersted and a (BH)max of 1.57 × 10⁶; at right angles 1,625 gauss. Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 5. They made blocks; disc size is ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Hejuru
3 days

Amabwiriza

1

Weigh barium carbonate and iron oxide

Weigh 450 g barium carbonate and 2000 g ferric oxide. Barium carbonate is poisonous if swallowed: gloves and a dust respirator.

Ibikoresho by'iyi ntambwe:

Karubonate ya bariyumu (witerite)Karubonate ya bariyumu (witerite)450 g
Oxide ya feriOxide ya feri2000 g

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
Agapfukamunwa ka P100Agapfukamunwa ka P100
2

Mill 20 hours under alcohol, dry

Grind the mixture in a ball mill under alcohol for 20 hours, then dry it.

Ibikoresho bikenewe:

Urusyo rw'imipira y'icyumaUrusyo rw'imipira y'icyuma
Etanoli - urwego rw'ubushakashatsi, 95 %Etanoli - urwego rw'ubushakashatsi, 95 %
Ifuru yo kumishahoIfuru yo kumishaho
3

Pre-fire: through a 1100 °C zone in 10 minutes

Pass the dry powder at 20 mm per minute through an electric furnace with a 20 cm hot zone at 1100 °C, in air: 10 minutes in the heat. Let it cool.

Ibikoresho bikenewe:

Itanura ry'umuyoboroItanura ry'umuyoboro
Ikirundo cyo gushongeramo gifite igifuniko (porukorene)Ikirundo cyo gushongeramo gifite igifuniko (porukorene)
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
4

Grind 12 hours with alcohol, dry

Pulverise the pre-fired material in a ball mill with alcohol for 12 hours, then dry it. This is the pre-fired powder.

Ibikoresho bikenewe:

Urusyo rw'imipira y'icyumaUrusyo rw'imipira y'icyuma
Etanoli - urwego rw'ubushakashatsi, 95 %Etanoli - urwego rw'ubushakashatsi, 95 %
Ifuru yo kumishahoIfuru yo kumishaho
5

Stir into water

Stir the pre-fired powder with water, 2 cc of water per gram of powder.

Ibikoresho bikenewe:

Amazi YatunganyijweAmazi Yatunganyijwe
6

Orient in a first field and mould

Put the suspension in a moulding die, apply a first magnetic field and mould it into blocks. The patent does not give this field's strength.

Ibikoresho bikenewe:

Ifumbiro ryo gukanda disikiIfumbiro ryo gukanda disiki
Iroha ry'amashanyaraziIroha ry'amashanyarazi
Imashini ikanda ikoresha amaziImashini ikanda ikoresha amazi
7

Heat to 500 °C in a 2000 oersted field

Put the block in an electric furnace between the magnet's poles. With a second field of 2000 oersted along the first field's direction, heat to 500 °C, which burns off the rest of the binder. Then switch the field off.

Ibikoresho bikenewe:

Itanura ry'umuyoboroItanura ry'umuyoboro
Iroha ry'amashanyaraziIroha ry'amashanyarazi
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
8

Sinter: through a 1280 °C zone in 5 minutes

Pass the block at 20 mm per minute through an electric furnace in air at 1280 °C with a 10 cm hot zone: about 5 minutes in the heat.

Ibikoresho bikenewe:

Itanura ry'umuyoboroItanura ry'umuyoboro
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
9

Magnetise in the principal direction

Magnetise the block along the direction of the first field, the principal direction. The patent magnetises it in a field in that direction; ours: an electromagnet. Find the north face with a compass.

Ibikoresho bikenewe:

Iroha ry'amashanyaraziIroha ry'amashanyarazi
IkirangamurongoIkirangamurongo

Ibikoresho

2

Ibikoresho bikenewe

14

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Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

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