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Barium-Calcium Ferrite Disc Magnet: 0.09 mol BaCO3 and 0.01 mol CaCO3 (Went, Philips 1956, Ex. 19)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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Barium-Calcium Ferrite Disc Magnet: 0.09 mol BaCO3 and 0.01 mol CaCO3 (Went, Philips 1956, Ex. 19)

A ceramic magnet with a tenth of the barium replaced by calcium: 0.09 mol barium carbonate and 0.01 mol calcium carbonate to 0.6 mol iron oxide, made as in Example 18: milled, presintered at 1000 °C, milled again, formed and passed through a 1330 °C furnace in 10 minutes. Went's rod held 1,705 gauss with a coercive force of 1,110 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 19. 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, chalk and iron oxide

Weigh 17.76 g barium carbonate (0.09 mol), 1.001 g calcium carbonate (0.01 mol) and 95.55 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)17.76 g
Kaboneti ya kalsiamu (chaki nyeupe)Kaboneti ya kalsiamu (chaki nyeupe)1.001 g
Oksidi ya feriOksidi ya feri95.55 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, dry at 150 °C

Grind with alcohol in a ball mill for 4 hours and dry in air at 150 °C.

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 air at 1000 °C for 2 hours

Fire in air at 1000 °C for 2 hours.

Zana zinazohitajika:

Tanuri ya muffleTanuri ya muffle
Kikaango cha kuyeyushia chenye mfuniko (kaure)Kikaango cha kuyeyushia chenye mfuniko (kaure)
Koleo la kaure ya kuyeyushiaKoleo la kaure ya kuyeyushia
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
4

Mill again 4 hours, dry, form

Grind again with alcohol for 4 hours and dry. Example 19 extrudes a rod; ours: press discs at 1.5 tonnes per cm², as Example 18 moulds its rod.

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 1330 °C zone in 10 minutes

Sinter at 1330 °C by passing the pieces through a 10 cm hot zone at 10 mm per minute: 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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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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