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Strontium Ferrite Disc Magnet: Presintered, 4 Minutes at 1150 °C (Went, Philips 1956, Ex. 25)
A strontium ferrite with more strontium: 0.4 mol strontium carbonate to 0.8 mol iron oxide, milled, presintered at 1000 °C, milled again, pressed and passed through a 1150 °C furnace in 4 minutes. Went's rod held 1,200 gauss with a coercive force of 3,710 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 25. 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
1
Dry the strontium carbonate and weigh
Dry the strontium carbonate and weigh
Dry the strontium carbonate at 100 °C. Weigh 59.05 g of it (0.4 mol) and 127.5 g ferric oxide (0.8 mol).
Ibikoresho by'iyi ntambwe:
Carbonate ya strontium59.05 g
Oxide ya feri127.5 gIbikoresho bikenewe:
Ifuru yo kumishaho
Umunzani w'ibiro
Agapfukamunwa ka P1002
2
Mill 7 hours, dry at 110 °C
Mill 7 hours, dry at 110 °C
Grind with alcohol in a ball mill for 7 hours and dry at 110 °C.
Ibikoresho bikenewe:
Urusyo rw'imipira y'icyuma
Etanoli - urwego rw'ubushakashatsi, 95 %Ifuru yo kumishaho3
3
Presinter in air at 1000 °C for 4 hours
Presinter in air at 1000 °C for 4 hours
Fire in air at 1000 °C for 4 hours.
Ibikoresho bikenewe:
Ifuru ya muffle
Ikirundo cyo gushongeramo gifite igifuniko (porukorene)
Amakoro y'Icyombo Gishongesha
Uturindantoki twihanganira ubushyuhe4
4
Mill again, dry, press at 1.5 t/cm²
Mill again, dry, press at 1.5 t/cm²
Grind again 7 hours with alcohol, dry at 110 °C and press at 1.5 tonnes per cm² (ours: discs).
Ibikoresho bikenewe:
Urusyo rw'imipira y'icyumaEtanoli - urwego rw'ubushakashatsi, 95 %Ifuru yo kumishaho
Imashini ikanda ikoresha amazi
Ifumbiro ryo gukanda disiki5
5
Pass through a 1150 °C zone in 4 minutes
Pass through a 1150 °C zone in 4 minutes
Sinter at 1150 °C by passing the pieces through a 4 cm hot zone at 10 mm per minute: 4 minutes in the heat.
Ibikoresho bikenewe:
Itanura ry'umuyoboroUturindantoki twihanganira ubushyuhe6
6
Magnetise the discs
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'amashanyarazi
IkirangamurongoIbikoresho
2- 59.05 gUmwanya
- 127.5 gUmwanya
Ibikoresho bikenewe
14- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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