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REVERSE ENGINEERING
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ÀWỌN OHUN WÍWỌ̀
Metal Oxide Varistor: Zinc Oxide with Bismuth, Manganese and Boric Oxides, 1350 °C (Masuyama 1972, Ex. 3)
Masuyama, Matsuoka and Nishi found that adding two more oxides to zinc oxide and bismuth oxide gives excellent non-linear properties. This is their Example 3 with manganese dioxide and boric oxide: 98.5 % zinc oxide and 0.5 % each of bismuth oxide, manganese dioxide and boric oxide by moles, sintered at 1350 °C. The disc measured a C-value of 101 at 1 mA and a nonlinearity exponent n of 22.2.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 3. Unknown: what the silver paint is. The spraying is ours, after US Army Corps of Engineers EM 1110-2-3401 (1999). The 10 g batch is our arithmetic. Picture: the patent's drawing.
Ilọsíwájú
1 day
Ìlànà
1
1
Weigh 98.5 : 0.5 : 0.5 : 0.5 and wet-mill 5 hours
Weigh 98.5 : 0.5 : 0.5 : 0.5 and wet-mill 5 hours
Mix zinc oxide, bismuth oxide, manganese dioxide and boric oxide 98.5 : 0.5 : 0.5 : 0.5 by moles. Ours, for 10 g: 9.626 g zinc oxide, 0.28 g bismuth oxide, 0.052 g manganese dioxide, 0.042 g boric oxide (our arithmetic). Mill wet for 5 hours, then dry. Unknown: the milling liquid.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Lulú Sínkì Ọ́ksídì9.626 g
Bismuth oxide0.28 g
Dioksidi manganesi (pirolusiti)0.052 g
Oxide bórọ́ọ̀nù0.042 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ẹ̀rọ Lílọ Bọ́ọ̀lù Irin
Ààrò ìgbẹ̀2
2
Press discs 13 mm by 2.5 mm
Press discs 13 mm by 2.5 mm
Press the powder in a mould into discs 13 mm across and 2.5 mm thick at 340 kg/cm², as in Example 1.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìtẹ̀ háídírọ́líìkì
Mọ́ọ̀dù títẹ díìsì
Kálípà Fáníà3
3
Sinter 1 hour at 1350 °C and furnace-cool
Sinter 1 hour at 1350 °C and furnace-cool
Sinter the discs in air for 1 hour at 1350 °C, then let them cool in the furnace to room temperature (about 15-30 °C).
Àwọn irinṣẹ́ tí a nílò:
Ààrò muffle4
4
Lap to 10 mm by 1.5 mm
Lap to 10 mm by 1.5 mm
Lap both faces with 600-mesh silicon carbide. The finished disc is 10 mm across and 1.5 mm thick.
Àwọn irinṣẹ́ tí a nílò:
Ọkà kaboidi silikoniKálípà Fáníà5
5
Spray aluminium electrodes and attach leads
Spray aluminium electrodes and attach leads
Spray a metallised film of aluminium on both faces. Attach a lead wire to each with conductive silver paint. Ours, after US Army Corps of Engineers EM 1110-2-3401 (1999): wire-arc spray the aluminium from two 3.2 mm wires melted by an 18-40 V DC arc and atomised by compressed air, 15-20 cm from the disc and never at less than 45°, in at least two coats at right angles of 50-75 µm each. Unknown: the paint.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìṣù aluminiọ̀mù1 as 3.2 mm spray wire
Kùn fàdákà tí ń gba iná mànàmáná1 as required
Okùn Bàbà2 ẹyọÀwọn irinṣẹ́ tí a nílò:
Kálípà Fáníà
Ìbọn ìfọ́nká iná-ọ̀run wáyà
Ohun ìtẹ̀ afẹ́fẹ́ ti iléeṣẹ́Àwọn ohun-èlò
7- 9.626 gÀyè
- 0.28 gÀyè
- Àyè
- 0.042 gÀyè
- 1 as 3.2 mm spray wireÀyè
- 1 as requiredÀyè
- 2 ẹyọÀyè
Ìtọ́nisọ́nà yìí ń ṣe
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