Ukusebenzisana
UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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.
Osezingeni eliphezulu
2 days
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
I-barium carbonate (i-witherite)79.4 g
I-ferric oxide580.9 gAmathuluzi adingekayo:
Isikali sesilinganiso
Amagilavu erabha
Isivikelo Sokuphefumula i-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).
Amathuluzi adingekayo:
Umshini Wokugaya Ngamabhola Ensimbi
I-ethanol - izinga lelabhorethri, 95 %
Ihhavini yokomisa
Umshini wokucindezela we-hydraulic
Isikhunta sokucindezela idiski
Isithando Sepayipi
Igesi ye-carbon dioxide
Isilinda segesi ecindezelwe
Amagilavu Amelana Nokushisa3
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.
Izinto zokwakha zalesi sinyathelo:
I-powder ye-polyvinyl alcohol1 as requiredAmathuluzi adingekayo:
Umshini Wokugaya Ngamabhola EnsimbiI-ethanol - izinga lelabhorethri, 95 %Umshini wokucindezela we-hydraulicIsikhunta sokucindezela idiski4
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.
Amathuluzi adingekayo:
Umshini wokucindezela we-hydraulicIsikhunta sokucindezela idiski5
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.
Amathuluzi adingekayo:
I-electromagnet
IkhompasiIzinto
3- Isibambeli
- 580.9 gIsibambeli
- 1 as requiredIsibambeli
Amathuluzi Adingekayo
14- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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