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Barium Ferrite Disc Magnet: 1 mol BaCO3 to 3.5 mol Iron Oxide, 1330 °C (Went, Philips 1956, Ex. 3)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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Barium Ferrite Disc Magnet: 1 mol BaCO3 to 3.5 mol Iron Oxide, 1330 °C (Went, Philips 1956, Ex. 3)

A barium ferrite with more iron oxide: 1 mol barium carbonate to 3.5 mol, made as in Example 1 and passed through a 1330 °C furnace in 20 minutes. Went's rod held 1,600 gauss with a coercive force of 1,990 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 3. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
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2 days

Maagizo

1

Weigh barium carbonate and iron oxide

Weigh 201.1 g barium carbonate (1 mol) and 560.7 g ferric oxide (3.5 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.

Vifaa kwa hatua hii:

Kabonati ya bariamu (witherite)Kabonati ya bariamu (witherite)201.1 g
Oksidi ya feriOksidi ya feri560.7 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 with alcohol 13.5 hours, dry and sieve

Grind the mixture with alcohol in a ball mill for 13.5 hours, then dry it and sieve it.

Zana zinazohitajika:

Kinu cha mipira ya chumaKinu cha mipira ya chuma
Etanoli ya maabara, 95 %Etanoli ya maabara, 95 %
Tanuri la kukaushiaTanuri la kukaushia
UngoUngo
3

Knead with a binder and form

Mix 300 g of the powder with a binder such as polyvinyl alcohol (Went names it or nitrocellulose) into a kneadable mass. The patent extrudes rods about 3 mm across; ours: press discs at 1.5 tonnes per cm², as in its other examples. Dry them in air for about 24 hours.

Zana zinazohitajika:

Unga wa polivinili alkoholiUnga wa polivinili alkoholi
Mashine ya kubana ya haidrolikiMashine ya kubana ya haidroliki
Kalibu ya kubana diskiKalibu ya kubana diski
Tanuri la kukaushiaTanuri la kukaushia
4

Pass through a 1330 °C zone in 20 minutes

Sinter in air at 1330 °C by passing the pieces through a 10 cm hot zone at 5 mm per minute: 20 minutes in the heat.

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
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

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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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