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Barium Ferrite Disc Magnet from Natural Magnetite, Presintered at 900 °C (Went, Philips 1956, Ex. 36, Procedure 1)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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28. Oktoba 2026DE
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Barium Ferrite Disc Magnet from Natural Magnetite, Presintered at 900 °C (Went, Philips 1956, Ex. 36, Procedure 1)

A barium ferrite magnet made from natural magnetite instead of ferric oxide: barium carbonate and magnetite ground 18 hours, presintered 3 hours at 900 °C, ground again 18 hours, pressed and sintered 2 hours at 1200 °C. Went's rod held 1,450 gauss with a coercive force of 2,425 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 36. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Juu
2 days

Maagizo

1

Weigh barium carbonate and magnetite

Weigh 9.9 g barium carbonate (0.05 mol) and 46.9 g natural magnetite, Fe3O4 (0.20 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.

Vifaa kwa hatua hii:

Kabonati ya bariamu (witherite)Kabonati ya bariamu (witherite)9.9 g
MagnetitiMagnetiti46.9 g

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Glavu za mpiraGlavu za mpira
Kinga ya Kupumua ya P100Kinga ya Kupumua ya P100
2

Grind 18 hours in a ball mill

Grind the mixture in a ball mill for 18 hours. The patent does not say whether wet or dry.

Zana zinazohitajika:

Kinu cha mipira ya chumaKinu cha mipira ya chuma
Kinga ya Kupumua ya P100Kinga ya Kupumua ya P100
3

Presinter at 900 °C for 3 hours

Fire the ground mixture at 900 °C for three hours and let it cool.

Zana zinazohitajika:

Tanuri ya muffleTanuri ya muffle
Kikaango cha kuyeyushia chenye mfuniko (kaure)Kikaango cha kuyeyushia chenye mfuniko (kaure)
Koleo la kaure ya kuyeyushiaKoleo la kaure ya kuyeyushia
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
4

Grind 18 hours in a ball mill

Grind it again in a ball mill for 18 hours. The patent does not say whether wet or dry.

Zana zinazohitajika:

Kinu cha mipira ya chumaKinu cha mipira ya chuma
Kinga ya Kupumua ya P100Kinga ya Kupumua ya P100
5

Press at 1.5 t/cm²

Press at 1.5 tonnes per cm² (ours: discs instead of a rod).

Zana zinazohitajika:

Mashine ya kubana ya haidrolikiMashine ya kubana ya haidroliki
Kalibu ya kubana diskiKalibu ya kubana diski
6

Sinter at 1200 °C for 2 hours

Sinter at 1200 °C for 2 hours. The patent gives no atmosphere for this example. Went's rod: 1,450 gauss, 2,425 oersted.

Zana zinazohitajika:

Tanuri ya muffleTanuri ya muffle
Koleo la kaure ya kuyeyushiaKoleo la kaure ya kuyeyushia
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
7

Magnetise the discs

The patent gives no magnetising method. Ours: lay a disc with its faces against the poles of a strong electromagnet, switch the current on, then off. Find which face is north with a compass.

Zana zinazohitajika:

Sumaku ya umemeSumaku ya umeme
DiraDira

Vifaa

2

Zana Zinazohitajika

12

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Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

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