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ÀWỌN OHUN WÍWỌ̀
Strontium-Calcium Ferrite Disc Magnet: Equal Strontium and Calcium, 1280 °C (Went, Philips 1956, Ex. 27)
A ferrite with half the strontium replaced by calcium: 0.3 mol strontium carbonate and 0.3 mol calcium carbonate to 3.1 mol iron oxide, milled 15 hours, pressed and passed through a 1280 °C furnace in 10 minutes. Went's rod held 1,645 gauss with a coercive force of 2,460 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 27. 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 the carbonates and iron oxide
Weigh the carbonates and iron oxide
Weigh 44.3 g strontium carbonate (0.3 mol), 30.2 g calcium carbonate (0.3 mol), 500.0 g ferric oxide (3.1 mol).
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Strontium carbonate44.3 g
Calcium carbonate (ẹfun funfun)30.2 g
Ọ́kísáìdì irin (III)500 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ẹ̀rọ Ìmí P1002
2
Mill with alcohol 15 hours, dry
Mill with alcohol 15 hours, dry
Grind the mixture with alcohol in a ball mill for 15 hours, then dry it.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù Irin
Ethanol - ìpele ilé-ìwádìí, 95 %
Ààrò ìgbẹ̀3
3
Press at 1.5 t/cm²
Press at 1.5 t/cm²
Press the dry powder at 1.5 tonnes per cm² (ours: discs instead of a rod).
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìtẹ̀ háídírọ́líìkì
Mọ́ọ̀dù títẹ díìsì4
4
Pass through a 1280 °C zone in 10 minutes
Pass through a 1280 °C zone in 10 minutes
Sinter 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 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
3- 44.3 gÀyè
- Àyè
- 500 gÀyè
Àwọn irinṣẹ́ tó nílò
11- Àyè
- Àyè
- Àyè
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