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Ferrite Toroid Core: Magnesium-Zinc Ferrite Fired at 1400 °C in Oxygen (Snoek)
Ferrite is a ceramic magnet: iron oxide combined with other metal oxides, carrying magnetic flux while hardly conducting electricity. Snoek at Philips (US 2,452,531, 1948) made this magnesium-zinc ferrite ring: magnesia, zinc oxide and iron oxide ground together, moulded with water into a ring and fired in oxygen at 1400 °C for 1 hour, then cooled slowly. His ring had an initial permeability of 525.
The picture: our diagram.
Ilọsíwájú
2 days
Ìlànà
1
1
Mix 26.5 : 26.5 : 47 mol
Mix 26.5 : 26.5 : 47 mol
Mix pure magnesium oxide, zinc oxide and iron oxide in the molecular ratio 26.5 : 26.5 : 47. Ours, by weight: 9.95 g magnesium oxide, 20.10 g zinc oxide and 69.95 g ferric oxide per 100 g.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ọ́sáídì magnesium9.95 g
Lulú Sínkì Ọ́ksídì20.1 g
Ọ́kísáìdì irin (III)69.95 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ìbòjú Eruku2
2
Grind for 3 hours in an iron ball mill
Grind for 3 hours in an iron ball mill
Grind the mixture for 3 hours in a mill with iron balls.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù IrinÌbòjú Eruku3
3
Mould a ring at 4 tons per cm²
Mould a ring at 4 tons per cm²
Mould a ring 3 cm across and 4 × 4 mm in section at 4 tons per square centimetre, with water as the plastifying and binding agent.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìtẹ̀ háídírọ́líìkì
Ìdà Títẹ̀ Òrùka
Omi Àyọ́4
4
Fire 1 hour at 1400 °C, cool at 3 °C a minute
Fire 1 hour at 1400 °C, cool at 3 °C a minute
Heat the ring in oxygen to 1400 °C for 1 hour (instead of 1300 °C), then cool it in oxygen at about 3 °C per minute. Snoek's ring had an initial permeability of 525.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́n
Oxygen
Àgbá gáàsì tí a fi ìfúnpá kún
Pirómítà
Ẹmú Ìkòkò Ìyọ́
Ìbọ̀wọ́ Tí Ń Fara Da OoruÀwọn ohun-èlò
3- 9.95 gÀyè
- 20.1 gÀyè
- 69.95 gÀyè
Àwọn irinṣẹ́ tó nílò
12- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
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