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

Ferrite is a ceramic magnet: iron oxide combined with other metal oxides, carrying magnetic flux while hardly conducting electricity. In his first ferrite patent (US 2,452,529, 1948) Snoek at Philips ground the oxides very fine and fired rings in oxygen. This copper-zinc ferrite is milled about 200 hours, fired 2 hours at 1050 °C and held 12 hours at 600 °C; his core had an initial permeability of 200. The picture: our diagram.

고급

2 weeks

안내

Mix 20 : 30 : 50 mol

Mix pure copper oxide, zinc oxide and ferric oxide, 20 : 30 : 50 mol %. Ours, by weight: 13.24 g copper oxide, 20.32 g zinc oxide and 66.44 g ferric oxide per 100 g.

이 단계의 재료:

산화 구리13.24 g

산화아연 분말20.32 g

산화제이철66.44 g

필요한 도구:

접시 저울

방진 마스크

Grind about 200 hours in an iron ball mill

Grind the mixture for about 200 hours in an iron ball mill.

필요한 도구:

철 볼 밀

방진 마스크

Mould a ring at 4 tons per cm²

Press the powder at 4 tons per square centimetre into a ring 3 cm across with a 4 × 4 mm section.

필요한 도구:

유압 프레스

링 프레스 다이

Fire 2 hours at 1050 °C, hold 12 hours at 600 °C

Heat the ring for two hours at 1050 °C in a current of oxygen, cool at 5 °C a minute to 600 °C, hold it there 12 hours, then cool to room temperature, all in oxygen. Snoek's core: initial permeability 200.

필요한 도구: