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Ferrite Toroid Core: Copper-Zinc Ferrite Sintered at 1150 °C, Presintered Three Times at 900 °C (Snoek 1948, Ex. I)
A soft ferrite ring core for coils and transformers: copper, zinc and iron oxides with a little brownstone, presintered three times at 900 °C, pressed into a ring and sintered at 1150 °C in oxygen. Snoek's ring had an initial permeability of 340.
Source: J. L. Snoek, US 2,452,530 (Philips, 1948), Example I and its table. The violet iron oxide has its own blueprint (precipitated hematite calcined at 1000-1100 °C, after Nurdini et al. 2022); Snoek does not say how his was made. Picture: the patent's Fig. 4, the ring core.
Ilọsíwájú
2 days
Ìlànà
1
1
Weigh 20 : 30 : 50 mol % and 1 % brownstone
Weigh 20 : 30 : 50 mol % and 1 % brownstone
Mix 20 mol % pure copper oxide, 30 mol % pure zinc oxide and 50 mol % pure violet iron oxide, and add 1 % by weight of brownstone (manganese dioxide). Ours, by weight: 13.24 g copper oxide, 20.32 g zinc oxide and 66.44 g iron oxide per 100 g, plus 1 g brownstone. Snoek does not say what makes it 'violet'; violet iron oxide has its own blueprint.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Oxide Bàbà13.24 g
Lulú Sínkì Ọ́ksídì20.32 g
Iron oxide aláwọ̀ àlùkò66.44 g
Dioksidi manganesi (pirolusiti)1 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ìbòjú Eruku2
2
Grind half an hour in an iron ball mill
Grind half an hour in an iron ball mill
Grind the mixture for half an hour in a mill with iron balls.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù IrinÌbòjú Eruku3
3
Presinter at 900 °C for 2 hours in oxygen
Presinter at 900 °C for 2 hours in oxygen
Heat the ground powder to 900 °C for 2 hours in oxygen and let it cool.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́n
Oxygen
Àgbá gáàsì tí a fi ìfúnpá kún
Pirómítà
Ìkòkò ìyọ́ pẹ̀lú ìdérí (porcelain)
Ìbọ̀wọ́ Tí Ń Fara Da Ooru4
4
Grind and presinter at 900 °C again (2 of 3)
Grind and presinter at 900 °C again (2 of 3)
Grind the powder, then heat it once more to 900 °C in oxygen. Snoek gives no times for the repeats.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù IrinÀàrò Ọ̀pọ́nOxygenÀgbá gáàsì tí a fi ìfúnpá kúnÌkòkò ìyọ́ pẹ̀lú ìdérí (porcelain)Ìbọ̀wọ́ Tí Ń Fara Da OoruÌbòjú Eruku5
5
Grind and presinter at 900 °C again (3 of 3)
Grind and presinter at 900 °C again (3 of 3)
Grind the powder, then heat it once more to 900 °C in oxygen. Snoek gives no times for the repeats.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù IrinÀàrò Ọ̀pọ́nOxygenÀgbá gáàsì tí a fi ìfúnpá kúnÌkòkò ìyọ́ pẹ̀lú ìdérí (porcelain)Ìbọ̀wọ́ Tí Ń Fara Da OoruÌbòjú Eruku6
6
Grind 2 hours with iron balls
Grind 2 hours with iron balls
Grind it for 2 hours in a disintegrator with iron balls.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù IrinÌbòjú Eruku7
7
Press a ring at 4 tons per cm²
Press a ring at 4 tons per cm²
Press the powder at 4 tons per square centimetre into a ring 3 cm across with a 4 × 4 mm cross-section.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìtẹ̀ háídírọ́líìkì
Ìdà Títẹ̀ ÒrùkaÌbòjú Eruku8
8
Sinter at 1150 °C in oxygen, cool 5–10 °C a minute
Sinter at 1150 °C in oxygen, cool 5–10 °C a minute
Sinter the ring at 1150 °C in a current of oxygen. Example I heats for 1 hour and cools in the oxygen at 5 to 10 °C per minute. Snoek's ring had an initial permeability of 340, measured at room temperature at 2 kHz.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́nOxygenÀgbá gáàsì tí a fi ìfúnpá kúnPirómítà
Ẹmú Ìkòkò Ìyọ́Ìbọ̀wọ́ Tí Ń Fara Da OoruÀwọn ohun-èlò
4- 13.24 gÀyè
- 20.32 gÀyè
- 66.44 gÀyè
Àwọn irinṣẹ́ tó nílò
12- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
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