IṢẸ́ ỌNÀ
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: 0.5 mol BaCO3 to 3.5 mol Iron Oxide, 10 Minutes at 1330 °C (Went, Philips 1956, Ex. 4)
A barium ferrite with much more iron oxide: 0.5 mol barium carbonate to 3.5 mol, milled 15.5 hours, bound, formed and sintered 10 minutes at 1330 °C. Went's rod held 2,040 gauss with a coercive force of 2,380 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 4. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Ilọsíwájú
2 days
Ìlànà
1
1
Weigh barium carbonate and iron oxide
Weigh barium carbonate and iron oxide
Weigh 99.2 g barium carbonate (0.5 mol) and 564.8 g ferric oxide (3.5 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Barium carbonate (witherite)99.2 g
Ọ́kísáìdì irin (III)564.8 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ìbọ̀wọ́ rọ́bà
Ẹ̀rọ Ìmí P1002
2
Mill with alcohol 15.5 hours, dry and sieve
Mill with alcohol 15.5 hours, dry and sieve
Grind the mixture with alcohol in a ball mill for 15.5 hours, then dry it and sieve it.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù Irin
Ethanol - ìpele ilé-ìwádìí, 95 %
Ààrò ìgbẹ̀
Ajọ̀3
3
Knead with a binder and form
Knead with a binder and form
Mix 300 g of the powder with a binder such as polyvinyl alcohol (Went names it or nitrocellulose) into a kneadable mass. The patent extrudes rods about 3 mm across; ours: press discs at 1.5 tonnes per cm², as in its other examples. Dry them in air for about 24 hours.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀lúbọ́ polyvinyl alcohol
Ẹ̀rọ ìtẹ̀ háídírọ́líìkì
Mọ́ọ̀dù títẹ díìsìÀàrò ìgbẹ̀4
4
Sinter in air at 1330 °C for 10 minutes
Sinter in air at 1330 °C for 10 minutes
Sinter the pieces in air at 1330 °C for 10 minutes. The patent gives no zone length or speed for this example.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́n
Ìbọ̀wọ́ Tí Ń Fara Da Ooru5
5
Magnetise the discs
Magnetise the discs
The patent gives no magnetising method. Ours: lay a disc with its faces against the poles of a strong electromagnet, switch the current on, then off. Find which face is north with a compass.
Àwọn irinṣẹ́ tí a nílò:
Òòfà iná-mànàmáná
Kọ́mpasiÀwọn ohun-èlò
2- Àyè
- 564.8 gÀyè
Àwọn irinṣẹ́ tó nílò
14- Àyè
- Àyè
- Àyè
- Àyè
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