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Oriented Barium Ferrite Disc Magnet: Weak 2000 Oersted Field, Then Pressed (Gorter, Philips 1956, Ex. 2)
A ceramic magnet from pre-fired barium ferrite powder suspended in polyvinyl acetate in acetone, oriented in a weak 2000 oersted field, then pressed into a block, heated to 500 °C in a field and sintered at 1300 °C. In the principal direction it held 2,550 gauss with a coercive force of 1,750 oersted and a (BH)max of 1.13 × 10⁶.
Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 2. They made blocks; disc size is ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
고급
3 days
안내
1
1
Weigh barium carbonate and iron oxide
Weigh barium carbonate and iron oxide
Weigh 450 g barium carbonate and 2000 g ferric oxide. Barium carbonate is poisonous if swallowed: gloves and a dust respirator.
이 단계의 재료:
탄산바륨(독중석)450 g
산화제이철2000 g필요한 도구:
접시 저울
고무장갑
P100 방진 마스크2
2
Mill 20 hours under alcohol, dry
Mill 20 hours under alcohol, dry
Grind the mixture in a ball mill under alcohol for 20 hours, then dry it.
필요한 도구:
철 볼 밀
에탄올 - 실험실 등급, 95 %
건조 가마3
3
Pre-fire: through a 1100 °C zone in 10 minutes
Pre-fire: through a 1100 °C zone in 10 minutes
Pass the dry powder at 20 mm per minute through an electric furnace with a 20 cm hot zone at 1100 °C, in air: 10 minutes in the heat. Let it cool.
필요한 도구:
관상로
뚜껑 달린 도가니(자기)
내열 장갑4
4
Grind 12 hours with alcohol, dry
Grind 12 hours with alcohol, dry
Pulverise the pre-fired material in a ball mill with alcohol for 12 hours, then dry it. This is the pre-fired powder.
필요한 도구:
철 볼 밀에탄올 - 실험실 등급, 95 %건조 가마5
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, 4 cc of solution per 3 g of powder. The binder burns off later.
필요한 도구:
폴리아세트산비닐
아세톤접시 저울6
6
Orient in a 2000 oersted field
Orient in a 2000 oersted field
Put the suspension in a moulding die between the poles of a magnet and apply a first field of 2000 oersted. Switch the field off and remove the binder solution.
필요한 도구:
원판 압축 금형
전자석
유압 프레스7
7
Compress into a block
Compress into a block
Compress the powder into a block. The pressure is not given.
필요한 도구:
유압 프레스원판 압축 금형8
8
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.
필요한 도구:
관상로전자석내열 장갑9
9
Sinter: through a 1300 °C zone in 5 minutes
Sinter: through a 1300 °C zone in 5 minutes
Pass the block at 20 mm per minute through an electric furnace in air at 1300 °C with a 10 cm hot zone: about 5 minutes in the heat.
필요한 도구:
관상로내열 장갑10
10
Magnetise in the principal direction
Magnetise in the principal direction
Magnetise the block along the direction of the first field, the principal direction. The patent magnetises it in a field in that direction; ours: an electromagnet. Find the north face with a compass.
필요한 도구:
전자석
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