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Strontium Ferrite Disc Magnet: Presintered, 4 Minutes at 1150 °C (Went, Philips 1956, Ex. 25)
A strontium ferrite with more strontium: 0.4 mol strontium carbonate to 0.8 mol iron oxide, milled, presintered at 1000 °C, milled again, pressed and passed through a 1150 °C furnace in 4 minutes. Went's rod held 1,200 gauss with a coercive force of 3,710 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 25. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Ilọsíwájú
2 days
Ìlànà
1
1
Dry the strontium carbonate and weigh
Dry the strontium carbonate and weigh
Dry the strontium carbonate at 100 °C. Weigh 59.05 g of it (0.4 mol) and 127.5 g ferric oxide (0.8 mol).
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Strontium carbonate59.05 g
Ọ́kísáìdì irin (III)127.5 gÀwọn irinṣẹ́ tí a nílò:
Ààrò ìgbẹ̀
Òǹwọ̀n ìdọ́gba
Ẹ̀rọ Ìmí P1002
2
Mill 7 hours, dry at 110 °C
Mill 7 hours, dry at 110 °C
Grind with alcohol in a ball mill for 7 hours and dry at 110 °C.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù Irin
Ethanol - ìpele ilé-ìwádìí, 95 %Ààrò ìgbẹ̀3
3
Presinter in air at 1000 °C for 4 hours
Presinter in air at 1000 °C for 4 hours
Fire in air at 1000 °C for 4 hours.
Àwọn irinṣẹ́ tí a nílò:
Ààrò muffle
Ìkòkò ìyọ́ pẹ̀lú ìdérí (porcelain)
Ẹmú Ìkòkò Ìyọ́
Ìbọ̀wọ́ Tí Ń Fara Da Ooru4
4
Mill again, dry, press at 1.5 t/cm²
Mill again, dry, press at 1.5 t/cm²
Grind again 7 hours with alcohol, dry at 110 °C and press at 1.5 tonnes per cm² (ours: discs).
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù IrinEthanol - ìpele ilé-ìwádìí, 95 %Ààrò ìgbẹ̀
Ẹ̀rọ ìtẹ̀ háídírọ́líìkì
Mọ́ọ̀dù títẹ díìsì5
5
Pass through a 1150 °C zone in 4 minutes
Pass through a 1150 °C zone in 4 minutes
Sinter at 1150 °C by passing the pieces through a 4 cm hot zone at 10 mm per minute: 4 minutes in the heat.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́nÌbọ̀wọ́ Tí Ń Fara Da Ooru6
6
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- 59.05 gÀyè
- 127.5 gÀyè
Àwọn irinṣẹ́ tó nílò
14- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
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