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Strontium Ferrite Disc Magnet: Example 8 Without the Orienting Field (Gorter, Philips 1956, Ex. 8 Comparison)
Made as in Example 8 but without the first, orienting field. Gorter's comparison block held 2,020 gauss with a coercive force of 3,225 oersted and a (BH)max of 0.99 × 10⁶.
Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 8. They made blocks; disc size is ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
高级
3 days
说明
1
1
Weigh strontium carbonate and iron oxide
Weigh strontium carbonate and iron oxide
Weigh 29.5 g strontium carbonate and 179 g ferric oxide.
此步骤所需材料：
碳酸锶29.5 克
氧化铁179 克所需工具：
等臂天平
P100 防毒面具2
2
Mill 15 hours with alcohol, dry
Mill 15 hours with alcohol, dry
Grind in a ball mill with alcohol for 15 hours. Remove the alcohol and dry the powder.
所需工具：
铁球磨机
乙醇——实验级，95 %
干燥炉3
3
Pre-fire 2 hours at 1000 °C in air
Pre-fire 2 hours at 1000 °C in air
Heat the powder for 2 hours at 1000 °C in an electric furnace in air. Let it cool.
所需工具：
马弗炉
带盖坩埚（瓷质）
坩埚钳
耐热手套4
4
Grind 4 hours in an agate centrifugal mill
Grind 4 hours in an agate centrifugal mill
Grind the cooled material for 4 hours with alcohol in an agate centrifugal mill, then dry it. This is the pre-fired powder.
所需工具：
玛瑙离心研磨机乙醇——实验级，95 %干燥炉5
5
Stir into 8 % polyvinyl acetate in acetone
Stir into 8 % polyvinyl acetate in acetone
Dissolve polyvinyl acetate in acetone to a 8 % solution and stir the pre-fired powder into it, 1 cc of solution per gram of powder. The binder burns off later.
所需工具：
聚乙酸乙烯酯
丙酮等臂天平6
6
Mould without a first field
Mould without a first field
Put the suspension in a moulding die and remove the binder solution without any magnetic field. This is the patent's comparison block.
所需工具：
圆片压模
液压机7
7
Heat to 500 °C in a 2000 oersted field
Heat to 500 °C in a 2000 oersted field
Put the block in an electric furnace between the magnet's poles. With a second field of 2000 oersted along the first field's direction, heat to 500 °C, which burns off the rest of the binder. Then switch the field off.
所需工具：
管式炉
电磁铁耐热手套8
8
Sinter: through a 1280 °C zone in 5 minutes
Sinter: through a 1280 °C zone in 5 minutes
Pass the block at 20 mm per minute through an electric furnace in air at 1280 °C with a 10 cm hot zone: about 5 minutes in the heat.
所需工具：
管式炉耐热手套9
9
Magnetise the block
Magnetise the block
Magnetise the block in a field. Without the orienting field it has no preferred direction. Ours: an electromagnet. Find the north face with a compass.
所需工具：
电磁铁
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