Ubufatanye
UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Strontium Ferrite Disc Magnet: Example 9 Without the Orienting Field (Gorter, Philips 1956, Ex. 9 Comparison)
Made as in Example 9 but without the first, orienting field. Gorter's comparison blocks held 2,075 gauss with a coercive force of 3,225 oersted and a (BH)max of 0.88 × 10⁶.
Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 9. They made blocks; disc size is ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Hejuru
3 days
Amabwiriza
1
1
Weigh strontium carbonate and iron oxide
Weigh strontium carbonate and iron oxide
Weigh 29.5 g strontium carbonate and 163 g ferric oxide.
Ibikoresho by'iyi ntambwe:
Carbonate ya strontium29.5 g
Oxide ya feri163 gIbikoresho bikenewe:
Umunzani w'ibiro
Agapfukamunwa ka P1002
2
Mill 15 hours with alcohol, dry
Mill 15 hours with alcohol, dry
Grind in a ball mill with alcohol for 15 hours. Remove the alcohol and dry the powder.
Ibikoresho bikenewe:
Urusyo rw'imipira y'icyuma
Etanoli - urwego rw'ubushakashatsi, 95 %
Ifuru yo kumishaho3
3
Pre-fire 2 hours at 1000 °C in air
Pre-fire 2 hours at 1000 °C in air
Heat the powder for 2 hours at 1000 °C in an electric furnace in air. Let it cool.
Ibikoresho bikenewe:
Ifuru ya muffle
Ikirundo cyo gushongeramo gifite igifuniko (porukorene)
Amakoro y'Icyombo Gishongesha
Uturindantoki twihanganira ubushyuhe4
4
Grind 4 hours in an agate centrifugal mill
Grind 4 hours in an agate centrifugal mill
Grind the cooled material for 4 hours with alcohol in an agate centrifugal mill, then dry it. This is the pre-fired powder. Example 9 does not say how its powder was pre-fired; ours: as in Example 8.
Ibikoresho bikenewe:
Urusyo ruzunguruka rwa agateEtanoli - urwego rw'ubushakashatsi, 95 %Ifuru yo kumishaho5
5
Stir into 8 % polyvinyl acetate in acetone
Stir into 8 % polyvinyl acetate in acetone
Dissolve polyvinyl acetate in acetone to a 8 % solution and stir the pre-fired powder into it, 1 cc of solution per gram of powder. The binder burns off later.
Ibikoresho bikenewe:
Polivinili asetate
AsetoneUmunzani w'ibiro6
6
Mould without a first field
Mould without a first field
Put the suspension in a moulding die and remove the binder solution without any magnetic field. This is the patent's comparison block.
Ibikoresho bikenewe:
Ifumbiro ryo gukanda disiki
Imashini ikanda ikoresha amazi7
7
Heat to 500 °C in a 2000 oersted field
Heat to 500 °C in a 2000 oersted field
Put the block in an electric furnace between the magnet's poles. With a second field of 2000 oersted along the first field's direction, heat to 500 °C, which burns off the rest of the binder. Then switch the field off.
Ibikoresho bikenewe:
Itanura ry'umuyoboro
Iroha ry'amashanyaraziUturindantoki twihanganira ubushyuhe8
8
Sinter: through a 1280 °C zone in 5 minutes
Sinter: through a 1280 °C zone in 5 minutes
Pass the block at 20 mm per minute through an electric furnace in air at 1280 °C with a 10 cm hot zone: about 5 minutes in the heat.
Ibikoresho bikenewe:
Itanura ry'umuyoboroUturindantoki twihanganira ubushyuhe9
9
Magnetise the block
Magnetise the block
Magnetise the block in a field. Without the orienting field it has no preferred direction. Ours: an electromagnet. Find the north face with a compass.
Ibikoresho bikenewe:
Iroha ry'amashanyarazi
IkirangamurongoIbikoresho
2- 29.5 gUmwanya
- 163 gUmwanya
Ibikoresho bikenewe
17- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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