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Barium-Calcium Ferrite Disc Magnet: Equal Barium and Calcium, Sintered at 1280 °C (Went, Philips 1956, Ex. 22)
A ceramic magnet with equal parts barium and calcium: 0.3 mol barium carbonate, 0.3 mol calcium carbonate and 3.1 mol iron oxide, milled 15 hours, pressed and passed through a 1280 °C furnace in 10 minutes, with no presintering. Went's rod held 1,595 gauss with a coercive force of 1,890 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 22. 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 barium carbonate, chalk and iron oxide
Weigh barium carbonate, chalk and iron oxide
Weigh 59.5 g barium carbonate (0.3 mol), 30.2 g calcium carbonate (0.3 mol) and 500.0 g ferric oxide (3.1 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.
此步骤所需材料：
碳酸钡（毒重石）59.5 克
碳酸钙（白垩粉）30.2 克
氧化铁500 克所需工具：
等臂天平
橡胶手套
P100 防毒面具2
2
Mill with alcohol 15 hours, dry, press
Mill with alcohol 15 hours, dry, press
Grind with alcohol in a ball mill for 15 hours, dry, and press at 1.5 tonnes per cm² (ours: discs instead of rods). No presintering.
所需工具：
铁球磨机
乙醇——实验级，95 %
干燥炉
液压机
圆片压模3
3
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4
4
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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