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Ferrite Toroid Core: Copper-Zinc Ferrite by the Wet Process, Precipitated with Caustic Soda (Snoek 1948)
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Ferrite Toroid Core: Copper-Zinc Ferrite by the Wet Process, Precipitated with Caustic Soda (Snoek 1948)

Snoek's copper-zinc ferrite made the wet way: copper, zinc and iron salts thrown down together with hot caustic soda, so the particles are very fine and pure. The washed deposit is pre-heated, pressed into a ring and fired in oxygen, with a 30-hour hold at 600 °C. His core reached an initial permeability of 500. Source: J. L. Snoek, US 2,452,529 (Philips, 1948), Example II, wet process. Picture: our diagram.
Osezingeni eliphezulu
3 days

Imiyalelo

1

Dissolve the copper, zinc and iron salts

Make 1 litre of a purified solution of 0.2 mol copper sulphate, 0.3 mol zinc sulphate and 1 mol iron nitrate. Ours: 49.94 g copper sulphate pentahydrate; weigh the zinc sulphate and ferric nitrate for the hydrate you have.

Izinto zokwakha zalesi sinyathelo:

I-copper sulfate pentahydrate (CuSO4·5H2O)I-copper sulfate pentahydrate (CuSO4·5H2O)49.94 g
I-zinc sulfateI-zinc sulfate0.3 mol
I-ferric nitrateI-ferric nitrate1 mol
Amanzi AcwengisisiweAmanzi Acwengisisiwe1 l

Amathuluzi adingekayo:

Isikali sesilinganisoIsikali sesilinganiso
Ibhikha Le-borosilicateIbhikha Le-borosilicate
Amagilavu erabhaAmagilavu erabha
2

Precipitate hot with 9 M caustic soda

Heat the solution and precipitate it with 0.5 litre of 9 molar caustic soda. Ours: 180 g sodium hydroxide in water to 0.5 litre. Strong alkali: goggles and gloves.

Izinto zokwakha zalesi sinyathelo:

I-Sodium Hydroxide — izinga laselabhorethriI-Sodium Hydroxide — izinga laselabhorethri180 g

Amathuluzi adingekayo:

Ibhikha Le-borosilicateIbhikha Le-borosilicate
Ipuleti ElishisayoIpuleti Elishisayo
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
Amagilavu erabhaAmagilavu erabha
3

Wash, dry and pre-heat at 700 °C

Wash out the deposit, dry it, and pre-heat it at 700 °C so it moulds better.

Amathuluzi adingekayo:

Iphepha LokuhluzaIphepha Lokuhluza
Amanzi AcwengisisiweAmanzi Acwengisisiwe
Ihhavini yokomisaIhhavini yokomisa
Isithando SepayipiIsithando Sepayipi
I-crucible enesivalo (i-porcelain)I-crucible enesivalo (i-porcelain)
Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa
4

Mould a ring at 4 tons per cm²

Mould 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
Imaski YothuliImaski Yothuli
5

Heat 3 hours at 900 °C, cool to 600 °C, hold 30 hours

Heat the ring for about 3 hours at 900 °C, cool it to 600 °C at 5 °C per minute, hold it there for 30 hours and let it cool to room temperature, all in a current of oxygen. Snoek's core: initial permeability 500.

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

5

Amathuluzi Adingekayo

18

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Ferrite Toroid Core: Copper-Zinc Ferrite Milled 200 Hours, Fired at 1050 °C (Snoek)

Ferrite Toroid Core: Copper-Zinc Ferrite Milled 200 Hours, Fired at 1050 °C (Snoek)

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Kwezimboni

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Ferric Nitrate: Scrap Iron Dissolved in Concentrated Nitric Acid (Thorpe 1912)
Yingozi

Ferric Nitrate: Scrap Iron Dissolved in Concentrated Nitric Acid (Thorpe 1912)

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