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Strontium Ferrite Disc Magnet, Sintered 4 Hours at 1100 °C (Went, Philips 1956, Ex. 34)
A strontium ferrite magnet made exactly like Went's barium ferrite of Example 34, with strontium carbonate in place of barium carbonate: 29.5 g of it to 191.7 g iron oxide, milled, fired, milled again, pressed and sintered for 4 hours. This iteration sinters at 1100 °C, where his rod held 1,220 gauss with a coercive force of 3,880 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 34. They pressed rods; 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 strontium carbonate and iron oxide
Weigh strontium carbonate and iron oxide
Weigh 29.5 g of strontium carbonate and 191.7 g of ferric oxide, Fe2O3. The patent makes this second mixture "in exactly the same manner" as the barium one.
이 단계의 재료:
탄산스트론튬29.5 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 1100 °C
Sinter 4 hours at 1100 °C
Sinter the discs for 4 hours at 1100 °C in oxygen or in air. The patent's strontium rod at 1100 °C: 1,220 gauss and 3,880 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
Strontium Carbonate: Powdered Celestine Boiled with Soda Solution (Thorpe 1912)
Charlie 작성
산업용
12
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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