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Ferrite Toroid Core: Magnesium-Zinc Ferrite Fired at 1300 °C in Oxygen (Snoek)
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21. uMfumfu 2026DE
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Ferrite Toroid Core: Magnesium-Zinc Ferrite Fired at 1300 °C in Oxygen (Snoek)

Ferrite is a ceramic magnet: iron oxide combined with other metal oxides, carrying magnetic flux while hardly conducting electricity. Snoek at Philips (US 2,452,531, 1948) made this magnesium-zinc ferrite ring: magnesia, zinc oxide and iron oxide ground together, moulded with water into a ring and fired in oxygen at 1300 °C for 1 hour, then cooled slowly. His ring had an initial permeability of 350. The picture: our diagram.
Osezingeni eliphezulu
1 day

Imiyalelo

1

Mix 26.5 : 26.5 : 47 mol

Mix pure magnesium oxide, zinc oxide and iron oxide in the molecular ratio 26.5 : 26.5 : 47. Ours, by weight: 9.95 g magnesium oxide, 20.10 g zinc oxide and 69.95 g ferric oxide per 100 g.

Izinto zokwakha zalesi sinyathelo:

I-oksayidi ye-magnesiumI-oksayidi ye-magnesium9.95 g
Impuphu Ye-Zinc OxideImpuphu Ye-Zinc Oxide20.1 g
I-ferric oxideI-ferric oxide69.95 g

Amathuluzi adingekayo:

Isikali sesilinganisoIsikali sesilinganiso
Imaski YothuliImaski Yothuli
2

Grind for 3 hours in an iron ball mill

Grind the mixture for 3 hours in a mill with iron balls.

Amathuluzi adingekayo:

Umshini Wokugaya Ngamabhola EnsimbiUmshini Wokugaya Ngamabhola Ensimbi
Imaski YothuliImaski Yothuli
3

Mould a ring at 4 tons per cm²

Mould a ring 3 cm across and 4 × 4 mm in section at 4 tons per square centimetre, with water as the plastifying and binding agent.

Amathuluzi adingekayo:

Umshini wokucindezela we-hydraulicUmshini wokucindezela we-hydraulic
Isikhunta Sokucindezela IzindandathoIsikhunta Sokucindezela Izindandatho
Amanzi AcwengisisiweAmanzi Acwengisisiwe
4

Fire 1 hour at 1300 °C, cool at 3 °C a minute

Heat the ring in oxygen to 1300 °C for 1 hour, then cool it in oxygen at about 3 °C per minute. Snoek's ring had an initial permeability of 350.

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

12

Le blueprint yenza

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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)

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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

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Inorganic

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