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Barium-Calcium Ferrite Disc Magnet: 20 % Calcium, 5 Minutes at 1290 °C (Went, Philips 1956, Ex. 20)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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Barium-Calcium Ferrite Disc Magnet: 20 % Calcium, 5 Minutes at 1290 °C (Went, Philips 1956, Ex. 20)

A ceramic magnet with a fifth of the barium replaced by calcium: 0.08 mol barium carbonate, 0.02 mol calcium carbonate and 0.6 mol iron oxide, made as in Example 18 but sintered at 1290 °C for only 5 minutes. Went's rod held 1,615 gauss with a coercive force of 1,550 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 20. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Osezingeni eliphezulu
2 days

Imiyalelo

1

Weigh barium carbonate, chalk and iron oxide

Weigh 15.79 g barium carbonate (0.08 mol), 2.002 g calcium carbonate (0.02 mol) and 95.55 g ferric oxide (0.6 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.

Izinto zokwakha zalesi sinyathelo:

I-barium carbonate (i-witherite)I-barium carbonate (i-witherite)15.79 g
I-calcium carbonate (umcako omhlophe)I-calcium carbonate (umcako omhlophe)2.002 g
I-ferric oxideI-ferric oxide95.55 g

Amathuluzi adingekayo:

Isikali sesilinganisoIsikali sesilinganiso
Amagilavu erabhaAmagilavu erabha
Isivikelo Sokuphefumula i-P100Isivikelo Sokuphefumula i-P100
2

Mill, presinter and mill as in Example 18

As in Example 18: grind with alcohol 4 hours, dry at 150 °C, fire in air at 1000 °C for 2 hours, grind again 4 hours and dry.

Amathuluzi adingekayo:

Umshini Wokugaya Ngamabhola EnsimbiUmshini Wokugaya Ngamabhola Ensimbi
I-ethanol - izinga lelabhorethri, 95 %I-ethanol - izinga lelabhorethri, 95 %
Ihhavini yokomisaIhhavini yokomisa
Isithando se-muffleIsithando se-muffle
I-crucible enesivalo (i-porcelain)I-crucible enesivalo (i-porcelain)
Udlawu Lwesitsha SokuncibilikisaUdlawu Lwesitsha Sokuncibilikisa
3

Press at 1.5 t/cm²

Press at 1.5 tonnes per cm², as in Example 18 (ours: discs instead of rods).

Amathuluzi adingekayo:

Umshini wokucindezela we-hydraulicUmshini wokucindezela we-hydraulic
Isikhunta sokucindezela idiskiIsikhunta sokucindezela idiski
4

Pass through a 1290 °C zone in 5 minutes

Sinter in air at 1290 °C by passing the pieces through a 10 cm hot zone at 20 mm per minute: 5 minutes in the heat.

Amathuluzi adingekayo:

Isithando SepayipiIsithando Sepayipi
Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa
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.

Amathuluzi adingekayo:

I-electromagnetI-electromagnet
IkhompasiIkhompasi

Izinto

3

Amathuluzi Adingekayo

15

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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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