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Ferrite Toroid Core: Magnesium-Zinc Ferrite Reheated 18 h at 1000 °C and 20 h at 750 °C (Snoek 1948, Ex. III)
Snoek's magnesium-zinc ferrite ring (Example III), fired at 1400 °C and then given a second long treatment in oxygen: 18 hours at 1000 °C and 20 hours at 750 °C. He measured how its losses change with frequency, but gives no permeability for the reheated core.
Source: J. L. Snoek, US 2,452,529 (Philips, 1948), Example III. Picture: our diagram.
Ilọsíwájú
3 days
Ìlànà
1
1
Weigh 28 : 18 : 54 mol %
Weigh 28 : 18 : 54 mol %
Mix 28 mol % magnesium oxide, 18 mol % zinc oxide and 54 mol % ferric oxide. Ours, by weight: 10.06 g magnesium oxide, 13.06 g zinc oxide and 76.88 g ferric oxide per 100 g.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ọ́sáídì magnesium10.06 g
Lulú Sínkì Ọ́ksídì13.06 g
Ọ́kísáìdì irin (III)76.88 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ìbòjú Eruku2
2
Grind 30 hours in an iron mill
Grind 30 hours in an iron mill
Grind the mixture for 30 hours in an iron ball mill.
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 the powder at 4 tons per square centimetre into a ring 3 cm across with a 4 × 4 mm section.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìtẹ̀ háídírọ́líìkì
Ìdà Títẹ̀ ÒrùkaÌbòjú Eruku4
4
Fire 2 hours at 1400 °C, cool 5–10 °C a minute
Fire 2 hours at 1400 °C, cool 5–10 °C a minute
Heat the ring in oxygen for 2 hours at 1400 °C and cool it slowly in oxygen at 5 to 10 °C per minute.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́n
Oxygen
Àgbá gáàsì tí a fi ìfúnpá kún
Pirómítà
Ẹmú Ìkòkò Ìyọ́
Ìbọ̀wọ́ Tí Ń Fara Da Ooru5
5
Reheat: 18 hours at 1000 °C, 20 hours at 750 °C
Reheat: 18 hours at 1000 °C, 20 hours at 750 °C
Heat the cooled core to 1000 °C and hold it there for 18 hours, then at 750 °C for 20 hours, and cool slowly again, all in oxygen. Snoek shows the resulting losses only as a curve; he gives no permeability for it.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́nOxygenÀgbá gáàsì tí a fi ìfúnpá kúnPirómítàẸmú Ìkòkò Ìyọ́Ìbọ̀wọ́ Tí Ń Fara Da OoruÀwọn ohun-èlò
3- 10.06 gÀyè
- 13.06 gÀyè
- 76.88 gÀyè
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