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Ferrite Toroid Core: Copper-Zinc Ferrite Fired at 1050 °C, Held at 600 °C in Oxygen (Snoek)
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21. uMfumfu 2026DE
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Ferrite Toroid Core: Copper-Zinc Ferrite Fired at 1050 °C, Held at 600 °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 copper-zinc ferrite ring at a lower heat: technical copper oxide, zinc oxide and iron oxide with 1 % brownstone, fired at 1050 °C, then held 14 hours at 600 °C, all in oxygen. His ring had an initial permeability of 385. The picture: our diagram.
Osezingeni eliphezulu
2 days

Imiyalelo

1

Mix 20.7 : 31.6 : 47.7 mol + 1 % brownstone

Mix technical copper oxide, zinc oxide and iron oxide in the molecular ratio 20.7 : 31.6 : 47.7 (on the pure oxides) and add 1 % by weight of brownstone (manganese dioxide). Ours, by weight: 13.91 g copper oxide, 21.73 g zinc oxide and 64.36 g ferric oxide per 100 g, plus 1 g brownstone.

Izinto zokwakha zalesi sinyathelo:

I-Copper OxideI-Copper Oxide13.91 g
Impuphu Ye-Zinc OxideImpuphu Ye-Zinc Oxide21.73 g
I-ferric oxideI-ferric oxide64.36 g
I-manganese dioxide (i-pyrolusite)I-manganese dioxide (i-pyrolusite)1 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 1050 °C, hold 14 hours at 600 °C

Sinter the ring in oxygen at 1050 °C for 1 hour, cool it slowly to 600 °C and hold it there for 14 hours, all in oxygen, then let it cool further. Snoek's core had an initial permeability of 385.

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

4

Amathuluzi Adingekayo

12

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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)
Yingozi

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

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Kwezimboni

5
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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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Copper(II) Oxide by Heating Copper in Air

Copper(II) Oxide by Heating Copper in Air

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Amakhemikhali

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