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Strontium Ferrite Disc Magnet: Presintered at 1100 °C, 0.2 mol SrCO3 to 1.1 mol Iron Oxide (Went, Philips 1956, Ex. 7)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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Strontium Ferrite Disc Magnet: Presintered at 1100 °C, 0.2 mol SrCO3 to 1.1 mol Iron Oxide (Went, Philips 1956, Ex. 7)

A strontium ferrite: 0.2 mol strontium carbonate to 1.1 mol iron oxide, dried, milled, presintered 3.5 hours at 1100 °C, bound, formed and passed through a 1280 °C furnace in 10 minutes. Went's rod held 2,155 gauss with a coercive force of 2,500 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 7. 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 strontium carbonate and iron oxide

Weigh 29.5 g strontium carbonate (0.2 mol) and 176.1 g ferric oxide (1.1 mol).

Ibikoresho by'iyi ntambwe:

Carbonate ya strontiumCarbonate ya strontium29.5 g
Oxide ya feriOxide ya feri176.1 g

Ibikoresho bikenewe:

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

Dry at 200 °C, mill with alcohol 4 hours

Dry the mixture at 200 °C, then grind it with alcohol in a ball mill for 4 hours and dry it.

Ibikoresho bikenewe:

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

Presinter in air at 1100 °C for 3.5 hours

Fire the powder in air at 1100 °C for about 3.5 hours.

Ibikoresho bikenewe:

Ifuru ya muffleIfuru ya muffle
Ikirundo cyo gushongeramo gifite igifuniko (porukorene)Ikirundo cyo gushongeramo gifite igifuniko (porukorene)
Amakoro y'Icyombo GishongeshaAmakoro y'Icyombo Gishongesha
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
4

Add a binder and form, dry overnight

Add a binder as in Example 1 (polyvinyl alcohol or nitrocellulose). The patent extrudes rods; ours: press discs at 1.5 tonnes per cm². Dry overnight.

Ibikoresho bikenewe:

Ifu ya polyvinyl alcoholIfu ya polyvinyl alcohol
Imashini ikanda ikoresha amaziImashini ikanda ikoresha amazi
Ifumbiro ryo gukanda disikiIfumbiro ryo gukanda disiki
Ifuru yo kumishahoIfuru yo kumishaho
5

Pass through a 1280 °C zone in 10 minutes

Sinter in air 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
6

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

Ibikoresho

2

Ibikoresho bikenewe

15

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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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