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Strontium-Calcium Ferrite Disc Magnet: 0.08 mol SrCO3 and 0.02 mol CaCO3, 1280 °C (Went, Philips 1956, Ex. 23)
A strontium ferrite with a fifth of the strontium replaced by calcium: 0.08 mol strontium carbonate and 0.02 mol calcium carbonate to 0.6 mol iron oxide, ground, dried, formed and passed through a 1280 °C furnace in 10 minutes. Went's rod held 2,320 gauss with a coercive force of 1,395 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 23. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
高级
2 days
说明
1
1
Weigh the carbonates and iron oxide
Weigh the carbonates and iron oxide
Weigh 11.81 g strontium carbonate (0.08 mol), 2.002 g calcium carbonate (0.02 mol), 95.55 g ferric oxide (0.6 mol).
此步骤所需材料：
碳酸锶11.81 克
碳酸钙（白垩粉）2.002 克
氧化铁95.55 克所需工具：
等臂天平
P100 防毒面具2
2
Mill with alcohol 4 hours, dry
Mill with alcohol 4 hours, dry
As in Examples 18 to 21: grind the mixture with alcohol in a ball mill for 4 hours, then dry it.
所需工具：
铁球磨机
乙醇——实验级，95 %
干燥炉3
3
Press at 1.5 t/cm²
Press at 1.5 t/cm²
Example 23 does not say whether the 1000 °C presinter of Examples 18 to 21 is used. Press the dry powder at 1.5 tonnes per cm² (ours: discs instead of a rod).
所需工具：
液压机
圆片压模4
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.
所需工具：
管式炉
耐热手套5
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.
所需工具：
电磁铁
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