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Ferrite Toroid Core: Magnesium-Zinc Ferrite (28 : 18 : 54) Fired at 1400 °C (Snoek)
Charlie

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Charlie

21. uMfumfu 2026DE
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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.
Osezingeni eliphezulu
3 days

Imiyalelo

1

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.

Izinto zokwakha zalesi sinyathelo:

I-oksayidi ye-magnesiumI-oksayidi ye-magnesium10.06 g
Impuphu Ye-Zinc OxideImpuphu Ye-Zinc Oxide13.06 g
I-ferric oxideI-ferric oxide76.88 g

Amathuluzi adingekayo:

Isikali sesilinganisoIsikali sesilinganiso
Imaski YothuliImaski Yothuli
2

Grind 30 hours in an iron ball mill

Grind the mixture for 30 hours in an iron ball mill.

Amathuluzi adingekayo:

Umshini Wokugaya Ngamabhola EnsimbiUmshini Wokugaya Ngamabhola Ensimbi
Imaski YothuliImaski Yothuli
3

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.

Amathuluzi adingekayo:

Umshini wokucindezela we-hydraulicUmshini wokucindezela we-hydraulic
Isikhunta Sokucindezela IzindandathoIsikhunta Sokucindezela Izindandatho
4

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.

Amathuluzi adingekayo:

Isithando SepayipiIsithando Sepayipi
I-oxygenI-oxygen
Isilinda segesi ecindezelweIsilinda segesi ecindezelwe
I-pyrometerI-pyrometer
Udlawu Lwesitsha SokuncibilikisaUdlawu Lwesitsha Sokuncibilikisa
Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa

Izinto

3

Amathuluzi Adingekayo

11

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Umgogodla We-Ferrite We-Toroid

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Ferrite Toroid Core: Nickel-Zinc Ferrite Sintered at 1300 °C in Oxygen (Snoek)
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Ferrite Toroid Core: Nickel-Zinc Ferrite Sintered at 1300 °C in Oxygen (Snoek)

ngu-CharlieDE

Kwezimboni

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Ferric Oxide: Hydroxide Precipitated from Ferric Chloride with Ammonia, Then Heated

Ferric Oxide: Hydroxide Precipitated from Ferric Chloride with Ammonia, Then Heated

ngu-CharlieDE

Inorganic

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