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

English

作成者

Charlie

28. 10月 2026

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.

上級者

3 days

手順

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.

このステップの材料:

硫酸銅五水和物（CuSO4·5H2O）49.94 g

硫酸亜鉛0.3 mol

硝酸鉄(III)1 mol

蒸留水1 l

必要な工具:

天秤ばかり

ホウケイ酸ビーカー

ゴム手袋

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.

このステップの材料:

水酸化ナトリウム——試薬級180 g

必要な工具:

ホウケイ酸ビーカー

ホットプレート

化学薬品飛沫用ゴーグル

ゴム手袋

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.

必要な工具:

ろ紙

蒸留水

乾燥炉

管状炉

蓋付きるつぼ（磁製）

耐熱手袋

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.

必要な工具:

油圧プレス

リング成形ダイス

防じんマスク

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.

必要な工具:

管状炉