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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
Charlie

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Charlie

28. Oktubre 2026DE
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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.
Abantado
2 days

Mga Tagubilin

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.

Mga materyales para sa hakbang na ito:

Barium carbonate (witherite)Barium carbonate (witherite)201.1 g
Ferric oxideFerric oxide560.7 g

Mga kailangang kasangkapan:

Timbangang panimbangTimbangang panimbang
Gwantes na gomaGwantes na goma
Panala sa Hininga na P100Panala sa Hininga na 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.

Mga kailangang kasangkapan:

Gilingang Bolang BakalGilingang Bolang Bakal
Etanol - antas laboratoryo, 95 %Etanol - antas laboratoryo, 95 %
Hurnong pantuyoHurnong pantuyo
BithayBithay
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.

Mga kailangang kasangkapan:

Pulbos na polyvinyl alcoholPulbos na polyvinyl alcohol
Haydroliko na pandiinHaydroliko na pandiin
Hulmahan sa pagpindot ng diskHulmahan sa pagpindot ng disk
Hurnong pantuyoHurnong pantuyo
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.

Mga kailangang kasangkapan:

Hurnong TuboHurnong Tubo
Guwantes na Matibay sa InitGuwantes na Matibay sa Init
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.

Mga kailangang kasangkapan:

ElektromagnetoElektromagneto
KompasKompas

Mga Materyales

2

Mga Kinakailangang Kasangkapan

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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