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Strontium Ferrite Disc Magnet: 0.4 mol SrCO3 to 3.6 mol Iron Oxide, 1270 °C (Went, Philips 1956, Ex. 14)
A ceramic magnet with strontium in place of barium: 0.4 mol strontium carbonate to 3.6 mol iron oxide, milled 15 hours and passed through a 1270 °C furnace in 20 minutes. Went's rod held 1,290 gauss with a coercive force of 3,080 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 14. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Advanced
2 days
Instructions
1
1
Weigh strontium carbonate and iron oxide
Weigh strontium carbonate and iron oxide
Weigh 59.1 g strontium carbonate (0.4 mol) and 580.0 g ferric oxide (3.6 mol).
Materials for this step:
Strontium Carbonate59.1 g
Ferric Oxide580 gTools needed:
Balance Scale
P100 Respirator2
2
Mill with alcohol 15 hours and dry
Mill with alcohol 15 hours and dry
Grind with alcohol in a ball mill for 15 hours and dry.
Tools needed:
Iron Ball Mill
Ethanol - Lab Grade, 95%
Drying Oven3
3
Form the pieces and dry overnight
Form the pieces and dry overnight
The patent extrudes rods; ours: press discs at 1.5 tonnes per cm², as in its other examples. Dry overnight.
Tools needed:
Hydraulic Press
Disc Pressing DieDrying Oven4
4
Pass through a 1270 °C zone in 20 minutes
Pass through a 1270 °C zone in 20 minutes
Sinter in air at 1270 °C by passing the pieces through a 10 cm hot zone at 5 mm per minute: 20 minutes in the heat.
Tools needed:
Tube Furnace
Heat-Resistant Gloves5
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.
Tools needed:
Electromagnet
CompassMaterials
2- 59.1 gPlaceholder
- 580 gPlaceholder
Tools Required
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