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Strontium Ferrite Disc Magnet: Example 9 Without the Orienting Field (Gorter, Philips 1956, Ex. 9 Comparison)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
Charlie

Nilikha ni

Charlie

28. Oktubre 2026DE
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Strontium Ferrite Disc Magnet: Example 9 Without the Orienting Field (Gorter, Philips 1956, Ex. 9 Comparison)

Made as in Example 9 but without the first, orienting field. Gorter's comparison blocks held 2,075 gauss with a coercive force of 3,225 oersted and a (BH)max of 0.88 × 10⁶. Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 9. They made blocks; disc size is ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Abantado
3 days

Mga Tagubilin

1

Weigh strontium carbonate and iron oxide

Weigh 29.5 g strontium carbonate and 163 g ferric oxide.

Mga materyales para sa hakbang na ito:

Strontium carbonateStrontium carbonate29.5 g
Ferric oxideFerric oxide163 g

Mga kailangang kasangkapan:

Timbangang panimbangTimbangang panimbang
Panala sa Hininga na P100Panala sa Hininga na P100
2

Mill 15 hours with alcohol, dry

Grind in a ball mill with alcohol for 15 hours. Remove the alcohol and dry the powder.

Mga kailangang kasangkapan:

Gilingang Bolang BakalGilingang Bolang Bakal
Etanol - antas laboratoryo, 95 %Etanol - antas laboratoryo, 95 %
Hurnong pantuyoHurnong pantuyo
3

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.

Mga kailangang kasangkapan:

Muffle furnaceMuffle furnace
Krisol na may takip (porselana)Krisol na may takip (porselana)
Sipit ng KrisolSipit ng Krisol
Guwantes na Matibay sa InitGuwantes na Matibay sa Init
4

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. Example 9 does not say how its powder was pre-fired; ours: as in Example 8.

Mga kailangang kasangkapan:

Centrifugal na gilingang agataCentrifugal na gilingang agata
Etanol - antas laboratoryo, 95 %Etanol - antas laboratoryo, 95 %
Hurnong pantuyoHurnong pantuyo
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.

Mga kailangang kasangkapan:

Polyvinyl acetatePolyvinyl acetate
AcetoneAcetone
Timbangang panimbangTimbangang panimbang
6

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.

Mga kailangang kasangkapan:

Hulmahan sa pagpindot ng diskHulmahan sa pagpindot ng disk
Haydroliko na pandiinHaydroliko na pandiin
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.

Mga kailangang kasangkapan:

Hurnong TuboHurnong Tubo
ElektromagnetoElektromagneto
Guwantes na Matibay sa InitGuwantes na Matibay sa Init
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.

Mga kailangang kasangkapan:

Hurnong TuboHurnong Tubo
Guwantes na Matibay sa InitGuwantes na Matibay sa Init
9

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.

Mga kailangang kasangkapan:

ElektromagnetoElektromagneto
KompasKompas

Mga Materyales

2

Mga Kinakailangang Kasangkapan

17

Ang blueprint na ito ay gumagawa ng

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Disc na Magnet

Free

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Kaugnay na Blueprint

Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo

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)

ni CharlieDE

Industriyal

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Strontium Carbonate: Powdered Celestine Boiled with Soda Solution (Thorpe 1912)

Strontium Carbonate: Powdered Celestine Boiled with Soda Solution (Thorpe 1912)

ni CharlieDE

Industriyal

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CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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