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Strontium-Calcium Ferrite Disc Magnet: 0.06 mol SrCO3 and 0.04 mol CaCO3, 1280 °C (Went, Philips 1956, Ex. 24)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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Strontium-Calcium Ferrite Disc Magnet: 0.06 mol SrCO3 and 0.04 mol CaCO3, 1280 °C (Went, Philips 1956, Ex. 24)

A strontium ferrite with 0.06 mol strontium carbonate and 0.04 mol calcium carbonate to 0.6 mol iron oxide, made as in Example 23. Went's rod held 2,120 gauss with a coercive force of 1,950 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 24. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Hejuru
2 days

Amabwiriza

1

Weigh the carbonates and iron oxide

Weigh 8.86 g strontium carbonate (0.06 mol), 4.004 g calcium carbonate (0.04 mol), 95.55 g ferric oxide (0.6 mol). The patent prints 81.86 g of strontium carbonate beside 0.06 mol. 0.06 mol is 8.86 g (ours, at 147.63 g per mol), the weight used here.

Ibikoresho by'iyi ntambwe:

Carbonate ya strontiumCarbonate ya strontium8.86 g
Kaboneti ya kalisiyumu (ifu y'umweru)Kaboneti ya kalisiyumu (ifu y'umweru)4.004 g
Oxide ya feriOxide ya feri95.55 g

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
Agapfukamunwa ka P100Agapfukamunwa ka P100
2

Mill with alcohol 4 hours, dry

As in Example 23: grind the mixture with alcohol in a ball mill for 4 hours, then dry it.

Ibikoresho bikenewe:

Urusyo rw'imipira y'icyumaUrusyo rw'imipira y'icyuma
Etanoli - urwego rw'ubushakashatsi, 95 %Etanoli - urwego rw'ubushakashatsi, 95 %
Ifuru yo kumishahoIfuru yo kumishaho
3

Press at 1.5 t/cm²

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

Ibikoresho bikenewe:

Imashini ikanda ikoresha amaziImashini ikanda ikoresha amazi
Ifumbiro ryo gukanda disikiIfumbiro ryo gukanda disiki
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.

Ibikoresho bikenewe:

Itanura ry'umuyoboroItanura ry'umuyoboro
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
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.

Ibikoresho bikenewe:

Iroha ry'amashanyaraziIroha ry'amashanyarazi
IkirangamurongoIkirangamurongo

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

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

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