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기술
웨어러블
Barium Ferrite Disc Magnet, Sintered at 1200 °C (Went, Philips 1956)
The dark grey ceramic magnet on fridges and in loudspeakers is barium ferrite. It is made from two cheap powders: one part barium carbonate to six of iron oxide, milled, fired, milled again, pressed and sintered. No cobalt or nickel is needed. This is Example 34 of the Philips patent. This iteration sinters at 1200 °C, where his rod held 1,400 gauss with a coercive force of 3,100 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956). They pressed rods; the claim covers "a body of a desired shape", and the disc size is ours. The patent does not say how to magnetise it; our way is stated. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
고급
2 days
안내
1
1
Weigh one part barium carbonate to six of iron oxide
Weigh one part barium carbonate to six of iron oxide
Weigh 39.5 g of barium carbonate (0.2 mol) and 191.7 g of ferric oxide, Fe2O3 (1.2 mol). Barium carbonate is poisonous if swallowed: ours, gloves and a dust respirator.
이 단계의 재료:
탄산바륨(독중석)39.5 g
산화제이철191.7 g필요한 도구:
접시 저울
고무장갑
P100 방진 마스크2
2
Mill with ethanol for 4 hours
Mill with ethanol for 4 hours
Grind the mixture with ethanol in an iron ball mill for 4 hours. Let the ethanol evaporate, then dry the powder in a drying oven.
필요한 도구:
철 볼 밀
에탄올 - 실험실 등급, 95 %
건조 가마3
3
Presinter at 1000 °C for 4 hours
Presinter at 1000 °C for 4 hours
Fire the dry powder in air at 1000 °C for 4 hours (ours: in a lidded porcelain crucible in a muffle furnace). Let it cool.
필요한 도구:
머플로
뚜껑 달린 도가니(자기)
도가니 집게
내열 장갑4
4
Mill again for 4 hours
Mill again for 4 hours
Grind the presintered product with ethanol in the ball mill for another 4 hours. Let the ethanol evaporate.
필요한 도구:
철 볼 밀에탄올 - 실험실 등급, 95 %건조 가마P100 방진 마스크5
5
Press discs at 1.5 tons per cm²
Press discs at 1.5 tons per cm²
Press the powder at 1.5 tons/cm². The patent pressed rods; we press discs. Ours: a die 20 mm across, so about 4.7 tonnes on the punch (our arithmetic: 1.5 × 3.14 cm²).
필요한 도구:
유압 프레스
원판 압축 금형6
6
Sinter 4 hours at 1200 °C
Sinter 4 hours at 1200 °C
Sinter the discs for 4 hours at 1200 °C in oxygen or in air. The patent's rod at 1200 °C: 1,400 gauss and 3,100 oersted.
필요한 도구:
머플로도가니 집게내열 장갑7
7
Magnetise the discs
Magnetise the discs
The patent gives no magnetising method. Ours: lay a disc with its faces against the poles of a strong electromagnet, switch the current on, then off. Find which face is north with a compass.
필요한 도구:
전자석
나침반이 블루프린트로 만드는 것
관련 블루프린트
이 블루프린트들은 지식을 공유합니다 — 기술, 재료 또는 원리
Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)
Charlie 작성
산업용
9
0
0
0
0
0
위험
Ferrite Toroid Core: Nickel-Zinc Ferrite Sintered at 1300 °C in Oxygen (Snoek)
Charlie 작성
산업용
17
0
0
0
0
0
Ferric Oxide: Hydroxide Precipitated from Ferric Chloride with Ammonia, Then Heated
Charlie 작성
무기
12
0
0
0
0
0
CC0 퍼블릭 도메인
이 블루프린트는 CC0로 공개되었습니다. 어떤 목적으로든 자유롭게 복사, 수정, 배포 및 사용할 수 있습니다.
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