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Strontium Ferrite Disc Magnet: 1 : 10 Strontium to Iron Oxide, 1280 °C (Went, Philips 1956, Ex. 26)
A strontium ferrite with much more iron oxide: 0.1 mol strontium carbonate to 1 mol, made as in Example 25 but passed through a 1280 °C furnace in 10 minutes. Went's rod held 1,200 gauss with a coercive force of 3,610 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 26. 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
Weigh strontium carbonate and iron oxide
Weigh strontium carbonate and iron oxide
Weigh 14.76 g strontium carbonate (0.1 mol) and 159.7 g ferric oxide (1 mol).
Mga materyales para sa hakbang na ito:
Strontium carbonate14.76 g
Ferric oxide159.7 gMga kailangang kasangkapan:
Timbangang panimbang
Panala sa Hininga na P1002
2
Mill, presinter and mill as in Example 25
Mill, presinter and mill as in Example 25
As in Example 25: grind with alcohol 7 hours, dry at 110 °C, fire in air at 1000 °C for 4 hours, grind again and dry.
Mga kailangang kasangkapan:
Gilingang Bolang Bakal
Etanol - antas laboratoryo, 95 %
Hurnong pantuyo
Muffle furnace
Krisol na may takip (porselana)
Sipit ng Krisol3
3
Press at 1.5 t/cm²
Press at 1.5 t/cm²
Press at 1.5 tonnes per cm² (ours: discs).
Mga kailangang kasangkapan:
Haydroliko na pandiin
Hulmahan sa pagpindot ng disk4
4
Pass through a 1280 °C zone in 10 minutes
Pass through a 1280 °C zone in 10 minutes
Sinter at 1280 °C by passing the pieces through a 10 cm hot zone at 10 mm per minute: 10 minutes in the heat.
Mga kailangang kasangkapan:
Hurnong Tubo
Guwantes na Matibay sa Init5
5
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- 14.76 gPlaceholder
- 159.7 gPlaceholder
Mga Kinakailangang Kasangkapan
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