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Strontium Ferrite Disc Magnet, Sintered 4 Hours at 1100 °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 1100 °C, where his rod held 1,220 gauss with a coercive force of 3,880 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.
Juu
2 days
Maagizo
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.
Vifaa kwa hatua hii:
Kaboneti ya strontiamu29.5 g
Oksidi ya feri191.7 gZana zinazohitajika:
Mizani ya mizani-mbili
Glavu za mpira
Kinga ya Kupumua ya 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.
Zana zinazohitajika:
Kinu cha mipira ya chuma
Etanoli ya maabara, 95 %
Tanuri la kukaushia3
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.
Zana zinazohitajika:
Tanuri ya muffle
Kikaango cha kuyeyushia chenye mfuniko (kaure)
Koleo la kaure ya kuyeyushia
Glavu Zinazostahimili Joto4
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.
Zana zinazohitajika:
Kinu cha mipira ya chumaEtanoli ya maabara, 95 %Tanuri la kukaushiaKinga ya Kupumua ya 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).
Zana zinazohitajika:
Mashine ya kubana ya haidroliki
Kalibu ya kubana diski6
6
Sinter 4 hours at 1100 °C
Sinter 4 hours at 1100 °C
Sinter the discs for 4 hours at 1100 °C in oxygen or in air. The patent's strontium rod at 1100 °C: 1,220 gauss and 3,880 oersted.
Zana zinazohitajika:
Tanuri ya muffleKoleo la kaure ya kuyeyushiaGlavu Zinazostahimili Joto7
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.
Zana zinazohitajika:
Sumaku ya umeme
DiraVifaa
2- 29.5 gKishikilia Nafasi
- 191.7 gKishikilia Nafasi
Zana Zinazohitajika
14- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)
na Charlie
Viwandani
2
0
0
0
0
0
Strontium Carbonate: Powdered Celestine Boiled with Soda Solution (Thorpe 1912)
na Charlie
Viwandani
6
0
0
0
0
0
Hatari
Ferrite Toroid Core: Nickel-Zinc Ferrite Sintered at 1300 °C in Oxygen (Snoek)
na Charlie
Viwandani
15
0
0
0
0
0
Ferric Oxide: Hydroxide Precipitated from Ferric Chloride with Ammonia, Then Heated
na Charlie
Isiyo hai
11
0
0
0
0
0
CC0 Umma Wote
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