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Ferrite Toroid Core: Magnesium-Zinc Ferrite Reheated 18 h at 1000 °C and 20 h at 750 °C (Snoek 1948, Ex. III)
Snoek's magnesium-zinc ferrite ring (Example III), fired at 1400 °C and then given a second long treatment in oxygen: 18 hours at 1000 °C and 20 hours at 750 °C. He measured how its losses change with frequency, but gives no permeability for the reheated core.
Source: J. L. Snoek, US 2,452,529 (Philips, 1948), Example III. Picture: our diagram.
Advanced
3 days
Instructions
1
1
Weigh 28 : 18 : 54 mol %
Weigh 28 : 18 : 54 mol %
Mix 28 mol % magnesium oxide, 18 mol % zinc oxide and 54 mol % ferric oxide. 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 mill
Grind 30 hours in an iron 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
Mould 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 DieDust Mask4
4
Fire 2 hours at 1400 °C, cool 5–10 °C a minute
Fire 2 hours at 1400 °C, cool 5–10 °C a minute
Heat the ring in oxygen for 2 hours at 1400 °C and cool it slowly in oxygen at 5 to 10 °C per minute.
Tools needed:
Tube Furnace
Oxygen
Pressure Gas Cylinder
Pyrometer
Crucible Tongs
Heat-Resistant Gloves5
5
Reheat: 18 hours at 1000 °C, 20 hours at 750 °C
Reheat: 18 hours at 1000 °C, 20 hours at 750 °C
Heat the cooled core to 1000 °C and hold it there for 18 hours, then at 750 °C for 20 hours, and cool slowly again, all in oxygen. Snoek shows the resulting losses only as a curve; he gives no permeability for it.
Tools needed:
Tube FurnaceOxygenPressure Gas CylinderPyrometerCrucible TongsHeat-Resistant GlovesMaterials
3- 10.06 gPlaceholder
- 13.06 gPlaceholder
- 76.88 gPlaceholder
Tools Required
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