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Strontium Ferrite Disc Magnet: 1 : 10 Strontium to Iron Oxide, 1280 °C (Went, Philips 1956, Ex. 26)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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28. Oktoba 2026DE
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Strontium Ferrite Disc Magnet: 1 : 10 Strontium to Iron Oxide, 1280 °C (Went, Philips 1956, Ex. 26)

A strontium ferrite with much more iron oxide: 0.1 mol strontium carbonate to 1 mol, made as in Example 25 but passed through a 1280 °C furnace in 10 minutes. Went's rod held 1,200 gauss with a coercive force of 3,610 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 26. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
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2 days

Maagizo

1

Weigh strontium carbonate and iron oxide

Weigh 14.76 g strontium carbonate (0.1 mol) and 159.7 g ferric oxide (1 mol).

Vifaa kwa hatua hii:

Kaboneti ya strontiamuKaboneti ya strontiamu14.76 g
Oksidi ya feriOksidi ya feri159.7 g

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Kinga ya Kupumua ya P100Kinga ya Kupumua ya P100
2

Mill, presinter and mill as in Example 25

As in Example 25: grind with alcohol 7 hours, dry at 110 °C, fire in air at 1000 °C for 4 hours, grind again and dry.

Zana zinazohitajika:

Kinu cha mipira ya chumaKinu cha mipira ya chuma
Etanoli ya maabara, 95 %Etanoli ya maabara, 95 %
Tanuri la kukaushiaTanuri la kukaushia
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
3

Press at 1.5 t/cm²

Press at 1.5 tonnes per cm² (ours: discs).

Zana zinazohitajika:

Mashine ya kubana ya haidrolikiMashine ya kubana ya haidroliki
Kalibu ya kubana diskiKalibu ya kubana diski
4

Pass through a 1280 °C zone in 10 minutes

Sinter at 1280 °C by passing the pieces through a 10 cm hot zone at 10 mm per minute: 10 minutes in the heat.

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
5

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

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Zana Zinazohitajika

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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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Viwandani

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Strontium Carbonate: Powdered Celestine Boiled with Soda Solution (Thorpe 1912)

Strontium Carbonate: Powdered Celestine Boiled with Soda Solution (Thorpe 1912)

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