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Oriented Barium Ferrite Disc Magnet: Powder Ground 48 Hours (Gorter, Philips 1956, Ex. 7)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
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28. Oktoba 2026DE
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Oriented Barium Ferrite Disc Magnet: Powder Ground 48 Hours (Gorter, Philips 1956, Ex. 7)

A ceramic magnet made as in Example 4 from pre-fired barium ferrite ground for 48 hours instead of 12. In the principal direction it held 3,100 gauss with a coercive force of 1,650 oersted and a (BH)max of 1.72 × 10⁶, the best in the patent. Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 7. 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 48 hours with alcohol, dry

Pulverise the pre-fired material in a ball mill with alcohol for 48 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, 1 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 10000 oersted field

Put the suspension in a moulding die between the poles of a magnet and apply a first field of 10000 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

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
8

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.

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
9

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

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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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