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Barium Ferrite Disc Magnet: Fired in Carbon Dioxide, Pressed at 12 t/cm² (Went, Philips 1956, Ex. 33)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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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.
Juu
2 days

Maagizo

1

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.

Vifaa kwa hatua hii:

Kabonati ya bariamu (witherite)Kabonati ya bariamu (witherite)79.4 g
Oksidi ya feriOksidi ya feri580.9 g

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Glavu za mpiraGlavu za mpira
Kinga ya Kupumua ya P100Kinga ya Kupumua ya P100
2

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).

Zana zinazohitajika:

Kinu cha mipira ya chumaKinu cha mipira ya chuma
Etanoli ya maabara, 95 %Etanoli ya maabara, 95 %
Tanuri la kukaushiaTanuri la kukaushia
Mashine ya kubana ya haidrolikiMashine ya kubana ya haidroliki
Kalibu ya kubana diskiKalibu ya kubana diski
Tanuru ya MrijaTanuru ya Mrija
Gesi ya kaboni dioksidiGesi ya kaboni dioksidi
Mtungi wa gesi yenye shinikizoMtungi wa gesi yenye shinikizo
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
3

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.

Vifaa kwa hatua hii:

Unga wa polivinili alkoholiUnga wa polivinili alkoholi1 as required

Zana zinazohitajika:

Kinu cha mipira ya chumaKinu cha mipira ya chuma
Etanoli ya maabara, 95 %Etanoli ya maabara, 95 %
Mashine ya kubana ya haidrolikiMashine ya kubana ya haidroliki
Kalibu ya kubana diskiKalibu ya kubana diski
4

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.

Zana zinazohitajika:

Mashine ya kubana ya haidrolikiMashine ya kubana ya haidroliki
Kalibu ya kubana diskiKalibu ya kubana diski
5

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.

Zana zinazohitajika:

Sumaku ya umemeSumaku ya umeme
DiraDira

Vifaa

3

Zana Zinazohitajika

14

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Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

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