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BOLEH PAKAI
Oriented Barium Ferrite Disc Magnet: Weak 2000 Oersted Field, Then Pressed (Gorter, Philips 1956, Ex. 2)
A ceramic magnet from pre-fired barium ferrite powder suspended in polyvinyl acetate in acetone, oriented in a weak 2000 oersted field, then pressed into a block, heated to 500 °C in a field and sintered at 1300 °C. In the principal direction it held 2,550 gauss with a coercive force of 1,750 oersted and a (BH)max of 1.13 × 10⁶.
Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 2. They made blocks; disc size is ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Lanjutan
3 days
Arahan
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.
Bahan untuk langkah ini:
Barium karbonat (witherit)450 g
Ferik Oksida2000 gAlatan diperlukan:
Neraca dua piring
Sarung tangan getah
Alat Pernafasan 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.
Alatan diperlukan:
Kilang Bebola Besi
Etanol mutu makmal, 95 %
Ketuhar pengeringan3
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.
Alatan diperlukan:
Relau Tiub
Mangkuk pijar bertutup (porselin)
Sarung Tangan Tahan Haba4
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.
Alatan diperlukan:
Kilang Bebola BesiEtanol mutu makmal, 95 %Ketuhar pengeringan5
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, 4 cc of solution per 3 g of powder. The binder burns off later.
Alatan diperlukan:
Polivinil Asetat
AsetonNeraca dua piring6
6
Orient in a 2000 oersted field
Orient in a 2000 oersted field
Put the suspension in a moulding die between the poles of a magnet and apply a first field of 2000 oersted. Switch the field off and remove the binder solution.
Alatan diperlukan:
Acuan tekan cakera
Elektromagnet
Mesin tekan hidraulik7
7
Compress into a block
Compress into a block
Compress the powder into a block. The pressure is not given.
Alatan diperlukan:
Mesin tekan hidraulikAcuan tekan cakera8
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.
Alatan diperlukan:
Relau TiubElektromagnetSarung Tangan Tahan Haba9
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.
Alatan diperlukan:
Relau TiubSarung Tangan Tahan Haba10
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.
Alatan diperlukan:
Elektromagnet
KompasBahan
2- Pemegang Tempat
- 2000 gPemegang Tempat
Alatan Diperlukan
15- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
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- Pemegang Tempat
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