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Oriented Barium Ferrite Disc Magnet: Binder Dried in a 2400 Oersted Field (Gorter, Philips 1956, Ex. 3)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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28. Oktoba 2026DE
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Oriented Barium Ferrite Disc Magnet: Binder Dried in a 2400 Oersted Field (Gorter, Philips 1956, Ex. 3)

A ceramic magnet from pre-fired barium ferrite in polyvinyl acetate and acetone, dried in a 2400 oersted field, then pressed, heated and sintered as in Example 2. In the principal direction it held 2,720 gauss with a coercive force of 1,620 oersted and a (BH)max of 1.2 × 10⁶; at right angles 1,610 gauss. Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 3. They made blocks; disc size is ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Juu
3 days

Maagizo

1

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.

Vifaa kwa hatua hii:

Kabonati ya bariamu (witherite)Kabonati ya bariamu (witherite)450 g
Oksidi ya feriOksidi ya feri2000 g

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Glavu za mpiraGlavu za mpira
Kinga ya Kupumua ya P100Kinga ya Kupumua ya P100
2

Mill 20 hours under alcohol, dry

Grind the mixture in a ball mill under alcohol for 20 hours, then dry it.

Zana zinazohitajika:

Kinu cha mipira ya chumaKinu cha mipira ya chuma
Etanoli ya maabara, 95 %Etanoli ya maabara, 95 %
Tanuri la kukaushiaTanuri la kukaushia
3

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.

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
Kikaango cha kuyeyushia chenye mfuniko (kaure)Kikaango cha kuyeyushia chenye mfuniko (kaure)
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
4

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.

Zana zinazohitajika:

Kinu cha mipira ya chumaKinu cha mipira ya chuma
Etanoli ya maabara, 95 %Etanoli ya maabara, 95 %
Tanuri la kukaushiaTanuri la kukaushia
5

Stir into 8 % polyvinyl acetate in acetone

Dissolve polyvinyl acetate in acetone to a 8 % solution and stir the pre-fired powder into it, 2 cc of solution per gram of powder. The binder burns off later.

Zana zinazohitajika:

Polivinili asetatiPolivinili asetati
AsetoniAsetoni
Mizani ya mizani-mbiliMizani ya mizani-mbili
6

Orient in a 2400 oersted field

Put the suspension in a moulding die between the poles of a magnet and apply a first field of 2400 oersted. Remove the binder solution while the field is on.

Zana zinazohitajika:

Kalibu ya kubana diskiKalibu ya kubana diski
Sumaku ya umemeSumaku ya umeme
Mashine ya kubana ya haidrolikiMashine ya kubana ya haidroliki
7

Compress into a block

Compress the powder into a block as in Example 2. The pressure is not given.

Zana zinazohitajika:

Mashine ya kubana ya haidrolikiMashine ya kubana ya haidroliki
Kalibu ya kubana diskiKalibu ya kubana diski
8

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.

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
Sumaku ya umemeSumaku ya umeme
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
9

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.

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
10

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.

Zana zinazohitajika:

Sumaku ya umemeSumaku ya umeme
DiraDira

Vifaa

2

Zana Zinazohitajika

15

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Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

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