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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)
Charlie

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Charlie

28. Oktoba 2026DE
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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.
Juu
3 days

Maagizo

1

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.

Vifaa kwa hatua hii:

Oksidi ya magnesiamuOksidi ya magnesiamu10.06 g
Poda ya oksidi ya zinkiPoda ya oksidi ya zinki13.06 g
Oksidi ya feriOksidi ya feri76.88 g

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Barakoa ya vumbiBarakoa ya vumbi
2

Grind 30 hours in an iron mill

Grind the mixture for 30 hours in an iron ball mill.

Zana zinazohitajika:

Kinu cha mipira ya chumaKinu cha mipira ya chuma
Barakoa ya vumbiBarakoa ya vumbi
3

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.

Zana zinazohitajika:

Mashine ya kubana ya haidrolikiMashine ya kubana ya haidroliki
Kalibu ya kubonyeza peteKalibu ya kubonyeza pete
Barakoa ya vumbiBarakoa ya vumbi
4

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.

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
OksijeniOksijeni
Mtungi wa gesi yenye shinikizoMtungi wa gesi yenye shinikizo
Kipima joto kaliKipima joto kali
Koleo la kaure ya kuyeyushiaKoleo la kaure ya kuyeyushia
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
5

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.

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
OksijeniOksijeni
Mtungi wa gesi yenye shinikizoMtungi wa gesi yenye shinikizo
Kipima joto kaliKipima joto kali
Koleo la kaure ya kuyeyushiaKoleo la kaure ya kuyeyushia
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto

Vifaa

3

Zana Zinazohitajika

11

Mchoro huu unatengeneza

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Kiini cha toroidi cha feraiti

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Ferrite Toroid Core: Magnesium-Zinc Ferrite (28 : 18 : 54) Fired at 1400 °C (Snoek)

Ferrite Toroid Core: Magnesium-Zinc Ferrite (28 : 18 : 54) Fired at 1400 °C (Snoek)

na CharlieDE

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