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Ferrite Toroid Core: Magnesium-Zinc Ferrite (28 : 18 : 54) Fired at 1400 °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 magnesium-zinc ferrite (28 : 18 : 54 mol %) is milled 30 hours and fired 2 hours at 1400 °C; his core had an initial permeability of 150.
The picture: our diagram.
Advanced
3 days
Instructions
1
1
Mix 28 : 18 : 54 mol
Mix 28 : 18 : 54 mol
Mix pure magnesium oxide, zinc oxide and ferric oxide, 28 : 18 : 54 mol %. Ours, by weight: 10.06 g magnesium oxide, 13.06 g zinc oxide and 76.88 g ferric oxide per 100 g.
Materials for this step:
Magnesium Oxide10.06 g
Zinc Oxide Powder13.06 g
Ferric Oxide76.88 gTools needed:
Balance Scale
Dust Mask2
2
Grind 30 hours in an iron ball mill
Grind 30 hours in an iron ball mill
Grind the mixture for 30 hours in an iron ball mill.
Tools needed:
Iron Ball MillDust Mask3
3
Mould a ring at 4 tons per cm²
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.
Tools needed:
Hydraulic Press
Ring Pressing Die4
4
Fire 2 hours at 1400 °C, cool slowly
Fire 2 hours at 1400 °C, cool slowly
Heat the ring in oxygen for 2 hours at 1400 °C, then cool it slowly in oxygen at 5–10 °C a minute. Snoek's core: initial permeability 150.
Tools needed:
Tube Furnace
Oxygen
Pressure Gas Cylinder
Pyrometer
Crucible Tongs
Heat-Resistant GlovesMaterials
3- 10.06 gPlaceholder
- 13.06 gPlaceholder
- 76.88 gPlaceholder
Tools Required
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