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Ferrite Toroid Core: Copper-Zinc Ferrite Milled 200 Hours, Fired at 1050 °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 copper-zinc ferrite is milled about 200 hours, fired 2 hours at 1050 °C and held 12 hours at 600 °C; his core had an initial permeability of 200.
The picture: our diagram.
Hejuru
2 weeks
Amabwiriza
1
1
Mix 20 : 30 : 50 mol
Mix 20 : 30 : 50 mol
Mix pure copper oxide, zinc oxide and ferric oxide, 20 : 30 : 50 mol %. Ours, by weight: 13.24 g copper oxide, 20.32 g zinc oxide and 66.44 g ferric oxide per 100 g.
Ibikoresho by'iyi ntambwe:
Okiside y'umuringa13.24 g
Ifu ya oxide ya zinki20.32 g
Oxide ya feri66.44 gIbikoresho bikenewe:
Umunzani w'ibiro
Agapfukamunwa k'Umukungugu2
2
Grind about 200 hours in an iron ball mill
Grind about 200 hours in an iron ball mill
Grind the mixture for about 200 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 1050 °C, hold 12 hours at 600 °C
Fire 2 hours at 1050 °C, hold 12 hours at 600 °C
Heat the ring for two hours at 1050 °C in a current of oxygen, cool at 5 °C a minute to 600 °C, hold it there 12 hours, then cool to room temperature, all in oxygen. Snoek's core: initial permeability 200.
Ibikoresho bikenewe:
Itanura ry'umuyoboro
Ogisijene
Ibariro rya gazi ifite igitutu
Pirometero
Amakoro y'Icyombo Gishongesha
Uturindantoki twihanganira ubushyuheIbikoresho
3- 13.24 gUmwanya
- 20.32 gUmwanya
- 66.44 gUmwanya
Ibikoresho bikenewe
11- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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