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Ferrite Toroid Core: Magnesium-Zinc Ferrite (28 : 18 : 54) Fired at 1400 °C (Snoek)
Ferrite is a ceramic magnet: iron oxide combined with other metal oxides, carrying magnetic flux while hardly conducting electricity. In his first ferrite patent (US 2,452,529, 1948) Snoek at Philips ground the oxides very fine and fired rings in oxygen. This magnesium-zinc ferrite (28 : 18 : 54 mol %) is milled 30 hours and fired 2 hours at 1400 °C; his core had an initial permeability of 150.
The picture: our diagram.
Hejuru
3 days
Amabwiriza
1
1
Mix 28 : 18 : 54 mol
Mix 28 : 18 : 54 mol
Mix pure magnesium oxide, zinc oxide and ferric oxide, 28 : 18 : 54 mol %. Ours, by weight: 10.06 g magnesium oxide, 13.06 g zinc oxide and 76.88 g ferric oxide per 100 g.
Ibikoresho by'iyi ntambwe:
Okiside ya magnesiyumu10.06 g
Ifu ya oxide ya zinki13.06 g
Oxide ya feri76.88 gIbikoresho bikenewe:
Umunzani w'ibiro
Agapfukamunwa k'Umukungugu2
2
Grind 30 hours in an iron ball mill
Grind 30 hours in an iron ball mill
Grind the mixture for 30 hours in an iron ball mill.
Ibikoresho bikenewe:
Urusyo rw'imipira y'icyumaAgapfukamunwa k'Umukungugu3
3
Mould a ring at 4 tons per cm²
Mould 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 section.
Ibikoresho bikenewe:
Imashini ikanda ikoresha amazi
Ibumbano ryo gukanda impeta4
4
Fire 2 hours at 1400 °C, cool slowly
Fire 2 hours at 1400 °C, cool slowly
Heat the ring in oxygen for 2 hours at 1400 °C, then cool it slowly in oxygen at 5–10 °C a minute. Snoek's core: initial permeability 150.
Ibikoresho bikenewe:
Itanura ry'umuyoboro
Ogisijene
Ibariro rya gazi ifite igitutu
Pirometero
Amakoro y'Icyombo Gishongesha
Uturindantoki twihanganira ubushyuheIbikoresho
3- 10.06 gUmwanya
- 13.06 gUmwanya
- 76.88 gUmwanya
Ibikoresho bikenewe
11- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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