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Oriented Barium Ferrite Disc Magnet: Set in a 9500 Oersted Field (Gorter, Philips 1956, Ex. 1)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
Charlie

Creado por

Charlie

28. octubre 2026DE
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Oriented Barium Ferrite Disc Magnet: Set in a 9500 Oersted Field (Gorter, Philips 1956, Ex. 1)

A ceramic magnet that is stronger in one direction. Pre-fired barium ferrite powder is suspended in polyvinyl acetate dissolved in acetone and set in a strong magnetic field, so its crystals line up. The block is heated to 500 °C in a weaker field and sintered at 1280 °C. In the principal direction it held 2,650 gauss with a coercive force of 1,775 oersted and a (BH)max of 1.3 × 10⁶; at right angles only 1,260 gauss. Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 1. They made blocks; disc size is ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Avanzado
3 days

Instrucciones

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.

Materiales para este paso:

Carbonato de bario (witherita)Carbonato de bario (witherita)450 g
Óxido férricoÓxido férrico2000 g

Herramientas necesarias:

Balanza de platillosBalanza de platillos
Guantes de gomaGuantes de goma
Respirador P100Respirador P100
2

Mill 20 hours under alcohol, dry

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

Herramientas necesarias:

Molino de bolas de hierroMolino de bolas de hierro
Etanol de laboratorio, 95 %Etanol de laboratorio, 95 %
Horno de secadoHorno de secado
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.

Herramientas necesarias:

Horno tubularHorno tubular
Crisol con tapa (porcelana)Crisol con tapa (porcelana)
Guantes resistentes al calorGuantes resistentes al calor
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.

Herramientas necesarias:

Molino de bolas de hierroMolino de bolas de hierro
Etanol de laboratorio, 95 %Etanol de laboratorio, 95 %
Horno de secadoHorno de secado
5

Stir into 16 % polyvinyl acetate in acetone

Dissolve polyvinyl acetate in acetone to a 16 % solution and stir the pre-fired powder into it, 2 cc of solution per gram of powder. The binder burns off later.

Herramientas necesarias:

Poliacetato de viniloPoliacetato de vinilo
AcetonaAcetona
Balanza de platillosBalanza de platillos
6

Orient in a 9500 oersted field

Put the suspension in a brass die between the poles of a magnet yoke and apply a first field of 9500 oersted. Let the acetone evaporate while the field is on. A small block forms.

Herramientas necesarias:

Matriz de prensado de discosMatriz de prensado de discos
ElectroimánElectroimán
Prensa hidráulicaPrensa hidráulica
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.

Herramientas necesarias:

Horno tubularHorno tubular
ElectroimánElectroimán
Guantes resistentes al calorGuantes resistentes al calor
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.

Herramientas necesarias:

Horno tubularHorno tubular
Guantes resistentes al calorGuantes resistentes al calor
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.

Herramientas necesarias:

ElectroimánElectroimán
BrújulaBrújula

Materiales

2

Herramientas requeridas

15

Este plano hace

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Imán de disco

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por CharlieDE

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