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TEKNOLOGI
BOLEH PAKAI
Strontium Ferrite Disc Magnet, Sintered 4 Hours at 1200 °C (Went, Philips 1956, Ex. 34)
A strontium ferrite magnet made exactly like Went's barium ferrite of Example 34, with strontium carbonate in place of barium carbonate: 29.5 g of it to 191.7 g iron oxide, milled, fired, milled again, pressed and sintered for 4 hours. This iteration sinters at 1200 °C, where his rod held 1,340 gauss with a coercive force of 3,900 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 34. They pressed rods; the disc size is ours. The patent does not say how to magnetise it; our way is stated. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Lanjutan
2 days
Arahan
1
1
Weigh strontium carbonate and iron oxide
Weigh strontium carbonate and iron oxide
Weigh 29.5 g of strontium carbonate and 191.7 g of ferric oxide, Fe2O3. The patent makes this second mixture "in exactly the same manner" as the barium one.
Bahan untuk langkah ini:
Strontium karbonat29.5 g
Ferik Oksida191.7 gAlatan diperlukan:
Neraca dua piring
Sarung tangan getah
Alat Pernafasan P1002
2
Mill with ethanol for 4 hours
Mill with ethanol for 4 hours
Grind the mixture with ethanol in an iron ball mill for 4 hours. Let the ethanol evaporate, then dry the powder in a drying oven.
Alatan diperlukan:
Kilang Bebola Besi
Etanol mutu makmal, 95 %
Ketuhar pengeringan3
3
Presinter at 1000 °C for 4 hours
Presinter at 1000 °C for 4 hours
Fire the dry powder in air at 1000 °C for 4 hours (ours: in a lidded porcelain crucible in a muffle furnace). Let it cool.
Alatan diperlukan:
Relau Muffle
Mangkuk pijar bertutup (porselin)
Penyepit Mangkuk Pijar
Sarung Tangan Tahan Haba4
4
Mill again for 4 hours
Mill again for 4 hours
Grind the presintered product with ethanol in the ball mill for another 4 hours. Let the ethanol evaporate.
Alatan diperlukan:
Kilang Bebola BesiEtanol mutu makmal, 95 %Ketuhar pengeringanAlat Pernafasan P1005
5
Press discs at 1.5 tons per cm²
Press discs at 1.5 tons per cm²
Press the powder at 1.5 tons/cm². The patent pressed rods; we press discs. Ours: a die 20 mm across, so about 4.7 tonnes on the punch (our arithmetic: 1.5 × 3.14 cm²).
Alatan diperlukan:
Mesin tekan hidraulik
Acuan tekan cakera6
6
Sinter 4 hours at 1200 °C
Sinter 4 hours at 1200 °C
Sinter the discs for 4 hours at 1200 °C in oxygen or in air. The patent's strontium rod at 1200 °C: 1,340 gauss and 3,900 oersted.
Alatan diperlukan:
Relau MufflePenyepit Mangkuk PijarSarung Tangan Tahan Haba7
7
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.
Alatan diperlukan:
Elektromagnet
KompasBahan
2- 29.5 gPemegang Tempat
- 191.7 gPemegang Tempat
Alatan Diperlukan
14- Pemegang Tempat
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Blueprint ini membuat
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Blueprint ini berkongsi pengetahuan — teknik, bahan atau prinsip
Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)
oleh Charlie
Industri
9
0
0
0
0
0
Strontium Carbonate: Powdered Celestine Boiled with Soda Solution (Thorpe 1912)
oleh Charlie
Industri
12
0
0
0
0
0
Berbahaya
Ferrite Toroid Core: Nickel-Zinc Ferrite Sintered at 1300 °C in Oxygen (Snoek)
oleh Charlie
Industri
17
0
0
0
0
0
Ferric Oxide: Hydroxide Precipitated from Ferric Chloride with Ammonia, Then Heated
oleh Charlie
Bukan Organik
12
0
0
0
0
0
CC0 Domain Awam
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