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Strontium-Calcium Ferrite Disc Magnet: Equal Strontium and Calcium, 1280 °C (Went, Philips 1956, Ex. 27)
A ferrite with half the strontium replaced by calcium: 0.3 mol strontium carbonate and 0.3 mol calcium carbonate to 3.1 mol iron oxide, milled 15 hours, pressed and passed through a 1280 °C furnace in 10 minutes. Went's rod held 1,645 gauss with a coercive force of 2,460 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 27. 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 the carbonates and iron oxide
Weigh the carbonates and iron oxide
Weigh 44.3 g strontium carbonate (0.3 mol), 30.2 g calcium carbonate (0.3 mol), 500.0 g ferric oxide (3.1 mol).
Mga materyales para sa hakbang na ito:
Strontium carbonate44.3 g
Calcium carbonate (puting tisa)30.2 g
Ferric oxide500 gMga kailangang kasangkapan:
Timbangang panimbang
Panala sa Hininga na P1002
2
Mill with alcohol 15 hours, dry
Mill with alcohol 15 hours, dry
Grind the mixture with alcohol in a ball mill for 15 hours, then dry it.
Mga kailangang kasangkapan:
Gilingang Bolang Bakal
Etanol - antas laboratoryo, 95 %
Hurnong pantuyo3
3
Press at 1.5 t/cm²
Press at 1.5 t/cm²
Press the dry powder at 1.5 tonnes per cm² (ours: discs instead of a rod).
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
3- 44.3 gPlaceholder
- Placeholder
- 500 gPlaceholder
Mga Kinakailangang Kasangkapan
11- Placeholder
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