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Ferrite Toroid Core: Copper-Zinc Ferrite Sintered at 1200 °C, Presintered Three Times at 900 °C (Snoek 1948, Ex. I)
A soft ferrite ring core for coils and transformers: copper, zinc and iron oxides with a little brownstone, presintered three times at 900 °C, pressed into a ring and sintered at 1200 °C in oxygen. Snoek's ring had an initial permeability of 1,000.
Source: J. L. Snoek, US 2,452,530 (Philips, 1948), Example I and its table. The violet iron oxide has its own blueprint (precipitated hematite calcined at 1000-1100 °C, after Nurdini et al. 2022); Snoek does not say how his was made. Picture: the patent's Fig. 4, the ring core.
Hejuru
2 days
Amabwiriza
1
1
Weigh 20 : 30 : 50 mol % and 1 % brownstone
Weigh 20 : 30 : 50 mol % and 1 % brownstone
Mix 20 mol % pure copper oxide, 30 mol % pure zinc oxide and 50 mol % pure violet iron oxide, and add 1 % by weight of brownstone (manganese dioxide). Ours, by weight: 13.24 g copper oxide, 20.32 g zinc oxide and 66.44 g iron oxide per 100 g, plus 1 g brownstone. Snoek does not say what makes it 'violet'; violet iron oxide has its own blueprint.
Ibikoresho by'iyi ntambwe:
Okiside y'umuringa13.24 g
Ifu ya oxide ya zinki20.32 g
Okiside y’icyuma y’ibara ry’isine66.44 g
Diyokiside ya manganize (pirolusite)1 gIbikoresho bikenewe:
Umunzani w'ibiro
Agapfukamunwa k'Umukungugu2
2
Grind half an hour in an iron ball mill
Grind half an hour in an iron ball mill
Grind the mixture for half an hour in a mill with iron balls.
Ibikoresho bikenewe:
Urusyo rw'imipira y'icyumaAgapfukamunwa k'Umukungugu3
3
Presinter at 900 °C for 2 hours in oxygen
Presinter at 900 °C for 2 hours in oxygen
Heat the ground powder to 900 °C for 2 hours in oxygen and let it cool.
Ibikoresho bikenewe:
Itanura ry'umuyoboro
Ogisijene
Ibariro rya gazi ifite igitutu
Pirometero
Ikirundo cyo gushongeramo gifite igifuniko (porukorene)
Uturindantoki twihanganira ubushyuhe4
4
Grind and presinter at 900 °C again (2 of 3)
Grind and presinter at 900 °C again (2 of 3)
Grind the powder, then heat it once more to 900 °C in oxygen. Snoek gives no times for the repeats.
Ibikoresho bikenewe:
Urusyo rw'imipira y'icyumaItanura ry'umuyoboroOgisijeneIbariro rya gazi ifite igitutuIkirundo cyo gushongeramo gifite igifuniko (porukorene)Uturindantoki twihanganira ubushyuheAgapfukamunwa k'Umukungugu5
5
Grind and presinter at 900 °C again (3 of 3)
Grind and presinter at 900 °C again (3 of 3)
Grind the powder, then heat it once more to 900 °C in oxygen. Snoek gives no times for the repeats.
Ibikoresho bikenewe:
Urusyo rw'imipira y'icyumaItanura ry'umuyoboroOgisijeneIbariro rya gazi ifite igitutuIkirundo cyo gushongeramo gifite igifuniko (porukorene)Uturindantoki twihanganira ubushyuheAgapfukamunwa k'Umukungugu6
6
Grind 2 hours with iron balls
Grind 2 hours with iron balls
Grind it for 2 hours in a disintegrator with iron balls.
Ibikoresho bikenewe:
Urusyo rw'imipira y'icyumaAgapfukamunwa k'Umukungugu7
7
Press a ring at 4 tons per cm²
Press a ring at 4 tons per cm²
Press the powder at 4 tons per square centimetre into a ring 3 cm across with a 4 × 4 mm cross-section.
Ibikoresho bikenewe:
Imashini ikanda ikoresha amazi
Ibumbano ryo gukanda impetaAgapfukamunwa k'Umukungugu8
8
Sinter at 1200 °C in oxygen, cool 5–10 °C a minute
Sinter at 1200 °C in oxygen, cool 5–10 °C a minute
Sinter the ring at 1200 °C in a current of oxygen. Example I heats for 1 hour and cools in the oxygen at 5 to 10 °C per minute. Snoek's ring had an initial permeability of 1,000, measured at room temperature at 2 kHz.
Ibikoresho bikenewe:
Itanura ry'umuyoboroOgisijeneIbariro rya gazi ifite igitutuPirometero
Amakoro y'Icyombo GishongeshaUturindantoki twihanganira ubushyuheIbikoresho
4- 13.24 gUmwanya
- 20.32 gUmwanya
- Umwanya
- Umwanya
Ibikoresho bikenewe
12- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
Blueprint zijyanye
Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame
CC0 Umurenge rusange
Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.
Shyigikira Umuremyi ugura ibicuruzwa binyuze muri Blueprint ye Komisiyo y'Umuremyi byashyizweho n'Abacuruzi, cyangwa kora verisiyo nshya y'iyi Blueprint ukayinjiza nk'isano muri Blueprint yawe kugira ngo musangire inyungu.