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Barium Ferrite Disc Magnet: Fired in Carbon Dioxide, Pressed at 12 t/cm² (Went, Philips 1956, Ex. 33)
A barium ferrite made with more iron oxide, 0.4 mol barium carbonate to 3.6 mol, fired an hour at 1300 °C in carbon dioxide. Little oxygen gives the hexagonal crystal BaFe18O27, with some iron in the lower state. It is milled again, bound with nitrocellulose or polyvinyl alcohol, and pressed hard at 12 tonnes per cm². Went's rod held 1,260 gauss with a coercive force of 700 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 33. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Abantado
2 days
Mga Tagubilin
1
1
Weigh barium carbonate and iron oxide
Weigh barium carbonate and iron oxide
Weigh 79.4 g barium carbonate (0.4 mol) and 580.9 g ferric oxide (3.6 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.
Mga materyales para sa hakbang na ito:
Barium carbonate (witherite)79.4 g
Ferric oxide580.9 gMga kailangang kasangkapan:
Timbangang panimbang
Gwantes na goma
Panala sa Hininga na P1002
2
Mill 15.5 hours, press a pastille, fire in CO2
Mill 15.5 hours, press a pastille, fire in CO2
Grind with alcohol in a ball mill for 15.5 hours, dry, and press into a pastille. Heat it at 1300 °C in carbon dioxide for 1 hour (ours: a tube furnace fed from a CO2 cylinder).
Mga kailangang kasangkapan:
Gilingang Bolang Bakal
Etanol - antas laboratoryo, 95 %
Hurnong pantuyo
Haydroliko na pandiin
Hulmahan sa pagpindot ng disk
Hurnong Tubo
Gas na carbon dioxide
Tangke ng gas na may presyon
Guwantes na Matibay sa Init3
3
Pulverise, mill 14 hours, bind
Pulverise, mill 14 hours, bind
Crush the cooled pastille and grind it with alcohol for 14 hours. Press the powder into a pastille again with a ceramic binder (ours: polyvinyl alcohol, one of the two named), then crush it to grains.
Mga materyales para sa hakbang na ito:
Pulbos na polyvinyl alcohol1 as requiredMga kailangang kasangkapan:
Gilingang Bolang BakalEtanol - antas laboratoryo, 95 %Haydroliko na pandiinHulmahan sa pagpindot ng disk4
4
Press at 12 tonnes per cm²
Press at 12 tonnes per cm²
Press the grains at 12 tonnes per cm² (ours: discs instead of rods). The patent describes no further firing.
Mga kailangang kasangkapan:
Haydroliko na pandiinHulmahan sa pagpindot ng disk5
5
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.
Mga kailangang kasangkapan:
Elektromagneto
KompasMga Materyales
3- Placeholder
- 580.9 gPlaceholder
- 1 as requiredPlaceholder
Mga Kinakailangang Kasangkapan
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