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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.
Abantado
2 days
Mga Tagubilin
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).
Mga materyales para sa hakbang na ito:
Strontium carbonate59.05 g
Ferric oxide127.5 gMga kailangang kasangkapan:
Hurnong pantuyo
Timbangang panimbang
Panala sa Hininga na 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.
Mga kailangang kasangkapan:
Gilingang Bolang Bakal
Etanol - antas laboratoryo, 95 %Hurnong pantuyo3
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.
Mga kailangang kasangkapan:
Muffle furnace
Krisol na may takip (porselana)
Sipit ng Krisol
Guwantes na Matibay sa Init4
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).
Mga kailangang kasangkapan:
Gilingang Bolang BakalEtanol - antas laboratoryo, 95 %Hurnong pantuyo
Haydroliko na pandiin
Hulmahan sa pagpindot ng disk5
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.
Mga kailangang kasangkapan:
Hurnong TuboGuwantes na Matibay sa Init6
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.
Mga kailangang kasangkapan:
Elektromagneto
KompasMga Materyales
2- 59.05 gPlaceholder
- 127.5 gPlaceholder
Mga Kinakailangang Kasangkapan
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