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UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
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IKORANABUHANGA
IBYAMBARWA
Barium-Calcium Ferrite Disc Magnet: 5 % Calcium, Sintered at 1330 °C (Went, Philips 1956, Ex. 18)
A ceramic magnet with a twentieth of the barium replaced by calcium: 0.095 mol barium carbonate, 0.005 mol calcium carbonate and 0.6 mol iron oxide. It is milled, fired in air, milled again, pressed and passed through a 1330 °C furnace in 10 minutes. The X-ray picture showed only the magnetoplumbite phase. Went's rod held 1,680 gauss with a coercive force of 1,110 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 18. 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
Weigh barium carbonate, chalk and iron oxide
Weigh barium carbonate, chalk and iron oxide
Weigh 18.74 g barium carbonate (0.095 mol), 0.5 g calcium carbonate (0.005 mol) and 95.55 g ferric oxide (0.6 mol). The patent used analytical-grade carbonates. Barium carbonate is poisonous if swallowed: gloves and a dust respirator.
Ibikoresho by'iyi ntambwe:
Karubonate ya bariyumu (witerite)18.74 g
Kaboneti ya kalisiyumu (ifu y'umweru)0.5 g
Oxide ya feri95.55 gIbikoresho bikenewe:
Umunzani w'ibiro
Uturindantoki tw'ikawusu
Agapfukamunwa ka P1002
2
Mill 4 hours, dry at 150 °C
Mill 4 hours, dry at 150 °C
Grind with alcohol in a ball mill for 4 hours and dry in air at 150 °C.
Ibikoresho bikenewe:
Urusyo rw'imipira y'icyuma
Etanoli - urwego rw'ubushakashatsi, 95 %
Ifuru yo kumishaho3
3
Presinter in air at 1000 °C for 2 hours
Presinter in air at 1000 °C for 2 hours
Fire the dry powder in air at 1000 °C for 2 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 with alcohol for 4 hours, dry, and press at 1.5 tonnes per cm² (ours: discs instead of rods).
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 1330 °C zone in 10 minutes
Pass through a 1330 °C zone in 10 minutes
Sinter at 1330 °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'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
3- Umwanya
- Umwanya
- 95.55 gUmwanya
Ibikoresho bikenewe
15- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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