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Barium-Calcium Ferrite Disc Magnet: Part of the Barium Replaced by Calcium (Went, Philips 1956, Ex. 21)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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Barium-Calcium Ferrite Disc Magnet: Part of the Barium Replaced by Calcium (Went, Philips 1956, Ex. 21)

A ceramic magnet in which part of the barium is replaced by calcium: 0.06 mol barium carbonate and 0.04 mol calcium carbonate to 0.6 mol iron oxide, milled, fired in oxygen, milled again, pressed and passed quickly through a hot furnace. Went's rod held 1,660 gauss with a coercive force of 1,210 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 21. 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, chalk and iron oxide

Weigh 11.84 g barium carbonate (0.06 mol), 4.004 g calcium carbonate (0.04 mol) and 99.55 g ferric oxide (0.6 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.

Vifaa kwa hatua hii:

Kabonati ya bariamu (witherite)Kabonati ya bariamu (witherite)11.84 g
Kaboneti ya kalsiamu (chaki nyeupe)Kaboneti ya kalsiamu (chaki nyeupe)4.004 g
Oksidi ya feriOksidi ya feri99.55 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 4 hours and dry

Grind the mixture with alcohol in a ball mill for 4 hours, then dry 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
3

Presinter in oxygen at 1000 °C for 2 hours

Fire the dry powder in oxygen at 1000 °C for 2 hours (ours: a tube furnace fed from an oxygen cylinder).

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
OksijeniOksijeni
Mtungi wa gesi yenye shinikizoMtungi wa gesi yenye shinikizo
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
4

Mill again 4 hours, dry, press at 1.5 t/cm²

Grind with alcohol in the ball mill for 4 hours, dry, and press at 1.5 tonnes per cm² (ours: discs instead of rods).

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
5

Pass through a 1200 °C zone in 10 minutes

Sinter at 1200 °C by passing the pieces through a 10 cm hot zone at 10 mm per minute, which is 10 minutes in the heat.

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
6

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

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Zana Zinazohitajika

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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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