IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
Barium-Calcium Ferrite Disc Magnet: Part of the Barium Replaced by Calcium (Went, Philips 1956, Ex. 21)
A ceramic magnet in which part of the barium is replaced by calcium: 0.06 mol barium carbonate and 0.04 mol calcium carbonate to 0.6 mol iron oxide, milled, fired in oxygen, milled again, pressed and passed quickly through a hot furnace. Went's rod held 1,660 gauss with a coercive force of 1,210 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 21. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Ilọsíwájú
2 days
Ìlànà
1
1
Weigh barium carbonate, chalk and iron oxide
Weigh barium carbonate, chalk and iron oxide
Weigh 11.84 g barium carbonate (0.06 mol), 4.004 g calcium carbonate (0.04 mol) and 99.55 g ferric oxide (0.6 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Barium carbonate (witherite)11.84 g
Calcium carbonate (ẹfun funfun)4.004 g
Ọ́kísáìdì irin (III)99.55 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ìbọ̀wọ́ rọ́bà
Ẹ̀rọ Ìmí P1002
2
Mill with alcohol 4 hours and dry
Mill with alcohol 4 hours and dry
Grind the mixture with alcohol in a ball mill for 4 hours, then dry it.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù Irin
Ethanol - ìpele ilé-ìwádìí, 95 %
Ààrò ìgbẹ̀3
3
Presinter in oxygen at 1000 °C for 2 hours
Presinter in oxygen at 1000 °C for 2 hours
Fire the dry powder in oxygen at 1000 °C for 2 hours (ours: a tube furnace fed from an oxygen cylinder).
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́n
Oxygen
Àgbá gáàsì tí a fi ìfúnpá kún
Ìbọ̀wọ́ Tí Ń Fara Da Ooru4
4
Mill again 4 hours, dry, press at 1.5 t/cm²
Mill again 4 hours, dry, press at 1.5 t/cm²
Grind with alcohol in the ball mill for 4 hours, dry, and press at 1.5 tonnes per cm² (ours: discs instead of rods).
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Lílọ Bọ́ọ̀lù IrinEthanol - ìpele ilé-ìwádìí, 95 %Ààrò ìgbẹ̀
Ẹ̀rọ ìtẹ̀ háídírọ́líìkì
Mọ́ọ̀dù títẹ díìsì5
5
Pass through a 1200 °C zone in 10 minutes
Pass through a 1200 °C zone in 10 minutes
Sinter at 1200 °C by passing the pieces through a 10 cm hot zone at 10 mm per minute, which is 10 minutes in the heat.
Àwọn irinṣẹ́ tí a nílò:
Ààrò Ọ̀pọ́nÌbọ̀wọ́ Tí Ń Fara Da Ooru6
6
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.
Àwọn irinṣẹ́ tí a nílò:
Òòfà iná-mànàmáná
Kọ́mpasiÀwọn ohun-èlò
3- 11.84 gÀyè
- Àyè
- 99.55 gÀyè
Àwọn irinṣẹ́ tó nílò
14- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
Blueprint tó jọra
Àwọn blueprint wọ̀nyí pín ìmọ̀ — ọ̀nà, ohun-èlò tàbí ìlànà
CC0 Àgbègbè Gbogbogbò
Blueprint yìí ti jáde lábẹ́ CC0. O lè ṣe àdàkọ, yí padà, pín, àti lò láìsí ìyọ̀ǹda.
Ṣàtìlẹ́yìn Olùṣẹ́dá nípa rírà àwọn ọjà nipasẹ̀ Blueprint wọn Ẹ̀san Olùṣẹ́dá tí àwọn Olùtajà gbé kalẹ̀, tàbí ṣẹ̀dá àtúnṣe tuntun ti Blueprint yìí kí o sì fi sínú Blueprint rẹ gẹ́gẹ́ bí ìsopọ̀ láti pín owó-wíwọlé.