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

28. Ukwakira 2026DE
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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.
Hejuru
3 days

Amabwiriza

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.

Ibikoresho by'iyi ntambwe:

Sulufate y'umuringa ifite amazi atanu (CuSO4·5H2O)Sulufate y'umuringa ifite amazi atanu (CuSO4·5H2O)49.94 g
Sulfate ya zincSulfate ya zinc0.3 mol
Nitrate y'icyuma (III)Nitrate y'icyuma (III)1 mol
Amazi YatunganyijweAmazi Yatunganyijwe1 l

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
Igikombe cya BorosilikateIgikombe cya Borosilikate
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
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.

Ibikoresho by'iyi ntambwe:

Hidorogisidi ya sodiyumu — urwego rw'ubushakashatsiHidorogisidi ya sodiyumu — urwego rw'ubushakashatsi180 g

Ibikoresho bikenewe:

Igikombe cya BorosilikateIgikombe cya Borosilikate
Urubaho rushyushyaUrubaho rushyushya
Amadarubindi yo Kwirinda IbinyabutabireAmadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
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.

Ibikoresho bikenewe:

Urupapuro rwo KuyungururaUrupapuro rwo Kuyungurura
Amazi YatunganyijweAmazi Yatunganyijwe
Ifuru yo kumishahoIfuru yo kumishaho
Itanura ry'umuyoboroItanura ry'umuyoboro
Ikirundo cyo gushongeramo gifite igifuniko (porukorene)Ikirundo cyo gushongeramo gifite igifuniko (porukorene)
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
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.

Ibikoresho bikenewe:

Imashini ikanda ikoresha amaziImashini ikanda ikoresha amazi
Ibumbano ryo gukanda impetaIbumbano ryo gukanda impeta
Agapfukamunwa k'UmukunguguAgapfukamunwa k'Umukungugu
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.

Ibikoresho bikenewe:

Itanura ry'umuyoboroItanura ry'umuyoboro
OgisijeneOgisijene
Ibariro rya gazi ifite igitutuIbariro rya gazi ifite igitutu
PirometeroPirometero
Amakoro y'Icyombo GishongeshaAmakoro y'Icyombo Gishongesha
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe

Ibikoresho

5

Ibikoresho bikenewe

18

Iki gishushanyo gikora

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

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