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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.
Ilọsíwájú
2 days
Ìlànà
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Strontium carbonate29.5 g
Ọ́kísáìdì irin (III)191.7 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ìbọ̀wọ́ rọ́bà
Ẹ̀rọ Ìmí 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.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù Irin
Ethanol - ìpele ilé-ìwádìí, 95 %
Ààrò ìgbẹ̀3
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.
Àwọn irinṣẹ́ tí a nílò:
Ààrò muffle
Ìkòkò ìyọ́ pẹ̀lú ìdérí (porcelain)
Ẹmú Ìkòkò Ìyọ́
Ìbọ̀wọ́ Tí Ń Fara Da Ooru4
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.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù IrinEthanol - ìpele ilé-ìwádìí, 95 %Ààrò ìgbẹ̀Ẹ̀rọ Ìmí 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).
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìtẹ̀ háídírọ́líìkì
Mọ́ọ̀dù títẹ díìsì6
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.
Àwọn irinṣẹ́ tí a nílò:
Ààrò muffleẸmú Ìkòkò Ìyọ́Ìbọ̀wọ́ Tí Ń Fara Da Ooru7
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.
Àwọn irinṣẹ́ tí a nílò:
Òòfà iná-mànàmáná
Kọ́mpasiÀwọn ohun-èlò
2- 29.5 gÀyè
- 191.7 gÀyè
Àwọn irinṣẹ́ tó nílò
14- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
Blueprint tó jọra
Àwọn blueprint wọ̀nyí pín ìmọ̀ — ọ̀nà, ohun-èlò tàbí ìlànà
Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)
láti ọwọ́ Charlie
Ti Ilé-iṣẹ́
5
0
0
0
0
0
Strontium Carbonate: Powdered Celestine Boiled with Soda Solution (Thorpe 1912)
láti ọwọ́ Charlie
Ti Ilé-iṣẹ́
9
0
0
0
0
0
Léwu
Ferrite Toroid Core: Nickel-Zinc Ferrite Sintered at 1300 °C in Oxygen (Snoek)
láti ọwọ́ Charlie
Ti Ilé-iṣẹ́
15
0
0
0
0
0
Ferric Oxide: Hydroxide Precipitated from Ferric Chloride with Ammonia, Then Heated
láti ọwọ́ Charlie
Inorganic
11
0
0
0
0
0
CC0 Àgbègbè Gbogbogbò
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