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Ferrite Toroid Core: Copper-Zinc Ferrite Fired at 1050 °C, Held at 600 °C in Oxygen (Snoek)
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21. Oṣù Kẹwà 2026DE
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Ferrite Toroid Core: Copper-Zinc Ferrite Fired at 1050 °C, Held at 600 °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 copper-zinc ferrite ring at a lower heat: technical copper oxide, zinc oxide and iron oxide with 1 % brownstone, fired at 1050 °C, then held 14 hours at 600 °C, all in oxygen. His ring had an initial permeability of 385. The picture: our diagram.
Ilọsíwájú
2 days

Ìlànà

1

Mix 20.7 : 31.6 : 47.7 mol + 1 % brownstone

Mix technical copper oxide, zinc oxide and iron oxide in the molecular ratio 20.7 : 31.6 : 47.7 (on the pure oxides) and add 1 % by weight of brownstone (manganese dioxide). Ours, by weight: 13.91 g copper oxide, 21.73 g zinc oxide and 64.36 g ferric oxide per 100 g, plus 1 g brownstone.

Àwọn ohun èlò fún ìgbésẹ̀ yìí:

Oxide BàbàOxide Bàbà13.91 g
Lulú Sínkì Ọ́ksídìLulú Sínkì Ọ́ksídì21.73 g
Ọ́kísáìdì irin (III)Ọ́kísáìdì irin (III)64.36 g
Dioksidi manganesi (pirolusiti)Dioksidi manganesi (pirolusiti)1 g

Àwọn irinṣẹ́ tí a nílò:

Òǹwọ̀n ìdọ́gbaÒǹwọ̀n ìdọ́gba
Ìbòjú ErukuÌbòjú Eruku
2

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 IrinẸ̀rọ Lílọ Bọ́ọ̀lù Irin
Ìbòjú ErukuÌbòjú Eruku
3

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 háídírọ́líìkìẸ̀rọ ìtẹ̀ háídírọ́líìkì
Ìdà Títẹ̀ ÒrùkaÌdà Títẹ̀ Òrùka
Omi Àyọ́Omi Àyọ́
4

Fire 1 hour at 1050 °C, hold 14 hours at 600 °C

Sinter the ring in oxygen at 1050 °C for 1 hour, cool it slowly to 600 °C and hold it there for 14 hours, all in oxygen, then let it cool further. Snoek's core had an initial permeability of 385.

Àwọn irinṣẹ́ tí a nílò:

Ààrò Ọ̀pọ́nÀàrò Ọ̀pọ́n
OxygenOxygen
Àgbá gáàsì tí a fi ìfúnpá kúnÀgbá gáàsì tí a fi ìfúnpá kún
PirómítàPirómítà
Ẹmú Ìkòkò Ìyọ́Ẹmú Ìkòkò Ìyọ́
Ìbọ̀wọ́ Tí Ń Fara Da OoruÌbọ̀wọ́ Tí Ń Fara Da Ooru

Àwọn ohun-èlò

4

Àwọn irinṣẹ́ tó nílò

12

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