ART
BEAUTY & WELLNESS
CRAFT
CULTURE & HISTORY
ENTERTAINMENT
ENVIRONMENT
FOOD & DRINKS
REVERSE ENGINEERING
SCIENCES
SPORTS
TECHNOLOGY
WEARABLES
Ferrite Toroid Core: Copper-Zinc Ferrite Fired at 1050 °C, Held at 600 °C in Oxygen (Snoek)
Ferrite is a ceramic magnet: iron oxide combined with other metal oxides, carrying magnetic flux while hardly conducting electricity. Snoek at Philips (US 2,452,531, 1948) made this copper-zinc ferrite ring at a lower heat: technical copper oxide, zinc oxide and iron oxide with 1 % brownstone, fired at 1050 °C, then held 14 hours at 600 °C, all in oxygen. His ring had an initial permeability of 385.
The picture: our diagram.
Advanced
2 days
Instructions
1
1
Mix 20.7 : 31.6 : 47.7 mol + 1 % brownstone
Mix 20.7 : 31.6 : 47.7 mol + 1 % brownstone
Mix technical copper oxide, zinc oxide and iron oxide in the molecular ratio 20.7 : 31.6 : 47.7 (on the pure oxides) and add 1 % by weight of brownstone (manganese dioxide). Ours, by weight: 13.91 g copper oxide, 21.73 g zinc oxide and 64.36 g ferric oxide per 100 g, plus 1 g brownstone.
Materials for this step:
Copper Oxide13.91 g
Zinc Oxide Powder21.73 g
Ferric Oxide64.36 g
Manganese Dioxide (Pyrolusite)1 gTools needed:
Balance Scale
Dust Mask2
2
Grind for 3 hours in an iron ball mill
Grind for 3 hours in an iron ball mill
Grind the mixture for 3 hours in a mill with iron balls.
Tools needed:
Iron Ball MillDust Mask3
3
Mould a ring at 4 tons per cm²
Mould a ring at 4 tons per cm²
Mould a ring 3 cm across and 4 × 4 mm in section at 4 tons per square centimetre, with water as the plastifying and binding agent.
Tools needed:
Hydraulic Press
Ring Pressing Die
Distilled Water4
4
Fire 1 hour at 1050 °C, hold 14 hours at 600 °C
Fire 1 hour at 1050 °C, hold 14 hours at 600 °C
Sinter the ring in oxygen at 1050 °C for 1 hour, cool it slowly to 600 °C and hold it there for 14 hours, all in oxygen, then let it cool further. Snoek's core had an initial permeability of 385.
Tools needed:
Tube Furnace
Oxygen
Pressure Gas Cylinder
Pyrometer
Crucible Tongs
Heat-Resistant GlovesMaterials
4- 13.91 gPlaceholder
- 21.73 gPlaceholder
- 64.36 gPlaceholder
- Placeholder
Tools Required
12- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
This blueprint makes
Related Blueprints
These blueprints share knowledge with this one — techniques, materials, or principles that connect them in the learning graph.
CC0 Public Domain
This blueprint is released under CC0. You are free to copy, modify, distribute, and use this work for any purpose, without asking permission.
Support the Maker by purchasing products through their Blueprint where they earn a Maker Commission set by Vendors, or create a new iteration of this Blueprint and include it as a connection in your own Blueprint to share revenue.