LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
Barium Ferrite Disc Magnet, Sintered at 1200 °C (Went, Philips 1956)
The dark grey ceramic magnet on fridges and in loudspeakers is barium ferrite. It is made from two cheap powders: one part barium carbonate to six of iron oxide, milled, fired, milled again, pressed and sintered. No cobalt or nickel is needed. This is Example 34 of the Philips patent. This iteration sinters at 1200 °C, where his rod held 1,400 gauss with a coercive force of 3,100 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956). They pressed rods; the claim covers "a body of a desired shape", and 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.
Lengra kominn
2 days
Leiðbeiningar
1
1
Weigh one part barium carbonate to six of iron oxide
Weigh one part barium carbonate to six of iron oxide
Weigh 39.5 g of barium carbonate (0.2 mol) and 191.7 g of ferric oxide, Fe2O3 (1.2 mol). Barium carbonate is poisonous if swallowed: ours, gloves and a dust respirator.
Efni fyrir þetta skref:
Baríumkarbónat (witherít)39.5 g
Járn(III)oxíð191.7 gNauðsynleg verkfæri:
Skálavog
Gúmmíhanskar
P100-öndunargríma2
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.
Nauðsynleg verkfæri:
Járnkúlukvörn
Etanól - rannsóknargráða, 95 %
Þurrkofn3
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.
Nauðsynleg verkfæri:
Múffluofn
Deigla með loki (postulín)
Deiglutöng
Hitaþolnir hanskar4
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.
Nauðsynleg verkfæri:
JárnkúlukvörnEtanól - rannsóknargráða, 95 %ÞurrkofnP100-öndunargríma5
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).
Nauðsynleg verkfæri:
Vökvapressa
Pressumót fyrir skífur6
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 rod at 1200 °C: 1,400 gauss and 3,100 oersted.
Nauðsynleg verkfæri:
MúffluofnDeiglutöngHitaþolnir hanskar7
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.
Nauðsynleg verkfæri:
Rafmagnssegull
ÁttavitiEfni
2- Staðgengill
- 191.7 gStaðgengill
Nauðsynleg verkfæri
14- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
Þessi teikning býr til
Tengd Blueprint
Þessi blueprint deila þekkingu — tækni, efni eða meginreglur
Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)
eftir Charlie
Iðnaður
2
0
0
0
0
0
Hættulegt
Ferrite Toroid Core: Nickel-Zinc Ferrite Sintered at 1300 °C in Oxygen (Snoek)
eftir Charlie
Iðnaður
15
0
0
0
0
0
Ferric Oxide: Hydroxide Precipitated from Ferric Chloride with Ammonia, Then Heated
eftir Charlie
Ólífrænt
11
0
0
0
0
0
CC0 opinbert ríki
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