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Oriented Barium Ferrite Disc Magnet: Binder Dried in a 2400 Oersted Field (Gorter, Philips 1956, Ex. 3)
A ceramic magnet from pre-fired barium ferrite in polyvinyl acetate and acetone, dried in a 2400 oersted field, then pressed, heated and sintered as in Example 2. In the principal direction it held 2,720 gauss with a coercive force of 1,620 oersted and a (BH)max of 1.2 × 10⁶; at right angles 1,610 gauss.
Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 3. They made blocks; disc size is ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Avanzato
3 days
Istruzioni
1
1
Weigh barium carbonate and iron oxide
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.
Materiali per questo passaggio:
Carbonato di bario (witherite)450 g
Ossido ferrico2000 gStrumenti necessari:
Bilancia a bracci
Guanti di gomma
Respiratore P1002
2
Mill 20 hours under alcohol, dry
Mill 20 hours under alcohol, dry
Grind the mixture in a ball mill under alcohol for 20 hours, then dry it.
Strumenti necessari:
Mulino a sfere di ferro
Etanolo per laboratorio, 95 %
Essiccatoio3
3
Pre-fire: through a 1100 °C zone in 10 minutes
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.
Strumenti necessari:
Forno a tubo
Crogiolo con coperchio (porcellana)
Guanti resistenti al calore4
4
Grind 12 hours with alcohol, dry
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.
Strumenti necessari:
Mulino a sfere di ferroEtanolo per laboratorio, 95 %Essiccatoio5
5
Stir into 8 % polyvinyl acetate in acetone
Stir into 8 % polyvinyl acetate in acetone
Dissolve polyvinyl acetate in acetone to a 8 % solution and stir the pre-fired powder into it, 2 cc of solution per gram of powder. The binder burns off later.
Strumenti necessari:
Polivinilacetato
AcetoneBilancia a bracci6
6
Orient in a 2400 oersted field
Orient in a 2400 oersted field
Put the suspension in a moulding die between the poles of a magnet and apply a first field of 2400 oersted. Remove the binder solution while the field is on.
Strumenti necessari:
Stampo per pressatura di dischi
Elettromagnete
Pressa idraulica7
7
Compress into a block
Compress into a block
Compress the powder into a block as in Example 2. The pressure is not given.
Strumenti necessari:
Pressa idraulicaStampo per pressatura di dischi8
8
Heat to 500 °C in a 2000 oersted field
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.
Strumenti necessari:
Forno a tuboElettromagneteGuanti resistenti al calore9
9
Sinter: through a 1300 °C zone in 5 minutes
Sinter: through a 1300 °C zone in 5 minutes
Pass the block at 20 mm per minute through an electric furnace in air at 1300 °C with a 10 cm hot zone: about 5 minutes in the heat.
Strumenti necessari:
Forno a tuboGuanti resistenti al calore10
10
Magnetise in the principal direction
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.
Strumenti necessari:
Elettromagnete
BussolaMateriali
2- Segnaposto
- 2000 gSegnaposto
Strumenti richiesti
15- Segnaposto
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