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Strontium Ferrite Disc Magnet: 1 mol SrCO3 to 2.5 mol Iron Oxide, 1200 °C (Went, Philips 1956, Ex. 9)
A strontium ferrite: 1 mol strontium carbonate to 2.5 mol iron oxide, milled, bound and formed as in Example 4, and passed through a 1200 °C furnace in 3 to 5 minutes. Went's rod held 1,555 gauss with a coercive force of 3,160 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 9. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Lanjutan
2 days
Instruksi
1
1
Weigh strontium carbonate and iron oxide
Weigh strontium carbonate and iron oxide
Weigh 147.6 g strontium carbonate (1 mol) and 403.4 g ferric oxide (2.5 mol).
Material untuk langkah ini:
Stronsium karbonat147.6 g
Besi(III) Oksida403.4 gAlat yang dibutuhkan:
Neraca lengan
Respirator P1002
2
Mill with alcohol 15.5 hours, dry and sieve
Mill with alcohol 15.5 hours, dry and sieve
As in Example 4: grind the mixture with alcohol in a ball mill for 15.5 hours, then dry it and sieve it.
Alat yang dibutuhkan:
Ball Mill Besi
Etanol mutu laboratorium, 95 %
Oven pengeringan
Ayakan3
3
Knead with a binder and form
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.
Alat yang dibutuhkan:
Bubuk polivinil alkohol
Mesin pres hidrolik
Cetakan press cakramOven pengeringan4
4
Pass through a 1200 °C zone in 3 to 5 minutes
Pass through a 1200 °C zone in 3 to 5 minutes
Sinter in air at 1200 °C by passing the pieces through a 3 to 5 cm hot zone at 10 mm per minute: 3 to 5 minutes in the heat.
Alat yang dibutuhkan:
Tungku Tabung
Sarung Tangan Tahan Panas5
5
Magnetise the discs
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.
Alat yang dibutuhkan:
Elektromagnet
KompasBahan
2- 147.6 gPlaceholder
- 403.4 gPlaceholder
Alat yang Diperlukan
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