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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.
Abantado
2 days
Mga Tagubilin
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.
Mga materyales para sa hakbang na ito:
Copper Oxide13.91 g
Pulbos ng Zinc Oxide21.73 g
Ferric oxide64.36 g
Manganese dioxide (pirolusita)1 gMga kailangang kasangkapan:
Timbangang panimbang
Maskara Laban sa Alikabok2
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.
Mga kailangang kasangkapan:
Gilingang Bolang BakalMaskara Laban sa Alikabok3
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.
Mga kailangang kasangkapan:
Haydroliko na pandiin
Dais na Pang-Press ng Singsing
Distiladong Tubig4
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.
Mga kailangang kasangkapan:
Hurnong Tubo
Oksiheno
Tangke ng gas na may presyon
Pirometro
Sipit ng Krisol
Guwantes na Matibay sa InitMga Materyales
4- 13.91 gPlaceholder
- 21.73 gPlaceholder
- 64.36 gPlaceholder
- Placeholder
Mga Kinakailangang Kasangkapan
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