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ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
Barium Ferrite Disc Magnet: Example 7 Without the Orienting Field (Gorter, Philips 1956, Ex. 7 Comparison)
Made as in Example 7 but without the first, orienting field. Gorter's comparison blocks held 2,250 gauss with a coercive force of 1,850 oersted and a (BH)max of 0.95 × 10⁶.
Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 7. They made blocks; disc size is ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Ilọsíwájú
3 days
Ìlànà
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Barium carbonate (witherite)450 g
Ọ́kísáìdì irin (III)2000 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ìbọ̀wọ́ rọ́bà
Ẹ̀rọ Ìmí 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.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù Irin
Ethanol - ìpele ilé-ìwádìí, 95 %
Ààrò ìgbẹ̀3
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.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́n
Ìkòkò ìyọ́ pẹ̀lú ìdérí (porcelain)
Ìbọ̀wọ́ Tí Ń Fara Da Ooru4
4
Grind 48 hours with alcohol, dry
Grind 48 hours with alcohol, dry
Pulverise the pre-fired material in a ball mill with alcohol for 48 hours, then dry it. This is the pre-fired powder.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù IrinEthanol - ìpele ilé-ìwádìí, 95 %Ààrò ìgbẹ̀5
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, 1 cc of solution per gram of powder. The binder burns off later.
Àwọn irinṣẹ́ tí a nílò:
Polyvinyl acetate
AcetoneÒǹwọ̀n ìdọ́gba6
6
Mould without a first field
Mould without a first field
Put the suspension in a moulding die and remove the binder solution without any magnetic field. This is the patent's comparison block.
Àwọn irinṣẹ́ tí a nílò:
Mọ́ọ̀dù títẹ díìsì
Ẹ̀rọ ìtẹ̀ háídírọ́líìkì7
7
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.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́n
Òòfà iná-mànàmánáÌbọ̀wọ́ Tí Ń Fara Da Ooru8
8
Sinter: through a 1280 °C zone in 5 minutes
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.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́nÌbọ̀wọ́ Tí Ń Fara Da Ooru9
9
Magnetise the block
Magnetise the block
Magnetise the block in a field. Without the orienting field it has no preferred direction. Ours: an electromagnet. Find the north face with a compass.
Àwọn irinṣẹ́ tí a nílò:
Òòfà iná-mànàmáná
Kọ́mpasiÀwọn ohun-èlò
2- Àyè
- 2000 gÀyè
Àwọn irinṣẹ́ tó nílò
15- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
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