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Barium Ferrite Disc Magnet: 0.5 mol BaCO3 to 3.5 mol Iron Oxide, 10 Minutes at 1330 °C (Went, Philips 1956, Ex. 4)
A barium ferrite with much more iron oxide: 0.5 mol barium carbonate to 3.5 mol, milled 15.5 hours, bound, formed and sintered 10 minutes at 1330 °C. Went's rod held 2,040 gauss with a coercive force of 2,380 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 4. 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 barium carbonate and iron oxide
Weigh barium carbonate and iron oxide
Weigh 99.2 g barium carbonate (0.5 mol) and 564.8 g ferric oxide (3.5 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.
Material untuk langkah ini:
Barium karbonat (witherit)99.2 g
Besi(III) Oksida564.8 gAlat yang dibutuhkan:
Neraca lengan
Sarung tangan karet
Respirator P1002
2
Mill with alcohol 15.5 hours, dry and sieve
Mill with alcohol 15.5 hours, dry and sieve
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 cakram
Oven pengeringan4
4
Sinter in air at 1330 °C for 10 minutes
Sinter in air at 1330 °C for 10 minutes
Sinter the pieces in air at 1330 °C for 10 minutes. The patent gives no zone length or speed for this example.
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- Placeholder
- 564.8 gPlaceholder
Alat yang Diperlukan
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