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
Strontium Ferrite Disc Magnet: 0.8 mol SrCO3 to 3.2 mol Iron Oxide, 1280 °C (Went, Philips 1956, Ex. 11)
A strontium ferrite: 0.8 mol strontium carbonate to 3.2 mol iron oxide, milled, bound and formed as in Example 4, and passed through a 1280 °C furnace in 10 minutes. Went's rod held 1,730 gauss with a coercive force of 3,090 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 11. 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 118.1 g strontium carbonate (0.8 mol) and 510.9 g ferric oxide (3.2 mol).
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Strontium carbonate118.1 g
Ọ́kísáìdì irin (III)510.9 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ẹ̀rọ Ìmí P1002
2
Mill with alcohol 15.5 hours, dry and sieve
Mill with alcohol 15.5 hours, dry and sieve
As in Example 4: 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
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 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- 118.1 gÀyè
- 510.9 gÀyè
Àwọn irinṣẹ́ tó nílò
13- Àyè
- Àyè
- Àyè
- Àyè
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