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ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
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ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
Strontium Ferrite Disc Magnet: Presintered at 1100 °C, 0.1 mol SrCO3 to 0.7 mol Iron Oxide (Went, Philips 1956, Ex. 8)
A strontium ferrite: 0.1 mol strontium carbonate to 0.7 mol iron oxide, dried, milled, presintered 3.5 hours at 1100 °C, bound, formed and passed through a 1280 °C furnace in 10 minutes. Went's rod held 1,535 gauss with a coercive force of 2,800 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 8. 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 strontium carbonate and iron oxide
Weigh strontium carbonate and iron oxide
Weigh 14.8 g strontium carbonate (0.1 mol) and 112.1 g ferric oxide (0.7 mol).
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Strontium carbonate14.8 g
Ọ́kísáìdì irin (III)112.1 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ẹ̀rọ Ìmí P1002
2
Dry at 200 °C, mill with alcohol 4 hours
Dry at 200 °C, mill with alcohol 4 hours
Dry the mixture at 200 °C, then grind it with alcohol in a ball mill for 4 hours and dry it.
Àwọn irinṣẹ́ tí a nílò:
Ààrò ìgbẹ̀
Ẹ̀rọ Lílọ Bọ́ọ̀lù Irin
Ethanol - ìpele ilé-ìwádìí, 95 %3
3
Presinter in air at 1100 °C for 3.5 hours
Presinter in air at 1100 °C for 3.5 hours
Fire the powder in air at 1100 °C for about 3.5 hours.
Àwọn irinṣẹ́ tí a nílò:
Ààrò muffle
Ìkòkò ìyọ́ pẹ̀lú ìdérí (porcelain)
Ẹmú Ìkòkò Ìyọ́
Ìbọ̀wọ́ Tí Ń Fara Da Ooru4
4
Add a binder and form, dry overnight
Add a binder and form, dry overnight
Add a binder as in Example 1 (polyvinyl alcohol or nitrocellulose). The patent extrudes rods; ours: press discs at 1.5 tonnes per cm². Dry overnight.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀lúbọ́ polyvinyl alcohol
Ẹ̀rọ ìtẹ̀ háídírọ́líìkì
Mọ́ọ̀dù títẹ díìsìÀàrò ìgbẹ̀5
5
Pass through a 1280 °C zone in 10 minutes
Pass through a 1280 °C zone in 10 minutes
Sinter in air at 1280 °C by passing the pieces through a 10 cm hot zone at 10 mm per minute: 10 minutes in the heat.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́nÌbọ̀wọ́ Tí Ń Fara Da Ooru6
6
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- 14.8 gÀyè
- 112.1 gÀyè
Àwọn irinṣẹ́ tó nílò
15- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
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