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Metal Oxide Varistor: Zinc Oxide with 0.2 % Bismuth Oxide, 1000 °C, 0.5 mm (Masuyama 1972)
A non-linear resistor: the current through it rises far faster than the voltage across it. Masuyama, Matsuoka and Nishi made one from zinc oxide with a little bismuth oxide: pressed into a disc, sintered, lapped, and given metal electrodes. With 0.2 mole % bismuth oxide, sintered at 1000 °C and lapped to 0.5 mm, the disc measured a C-value of 21 at 1 mA and a nonlinearity exponent n of 4.5.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 1. Unknown: how the aluminium is sprayed on and what the silver paint is. The patent calls both well known, so they are linked to unknown heads. The 10 g batch is our arithmetic. Picture: the patent's drawing.
Lanjutan
1 day
Instruksi
1
1
Weigh 99.8 ZnO to 0.2 Bi2O3 and wet-mill 5 hours
Weigh 99.8 ZnO to 0.2 Bi2O3 and wet-mill 5 hours
Mix zinc oxide and bismuth oxide 99.8 : 0.2 by moles. Ours, for 10 g: 9.887 g zinc oxide and 0.113 g bismuth oxide (our arithmetic). Mill wet for 5 hours, then dry. Unknown: the milling liquid.
Material untuk langkah ini:
Serbuk Seng Oksida9.887 g
Bismut oksida0.113 gAlat yang dibutuhkan:
Neraca lengan
Ball Mill Besi
Oven pengeringan2
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.
Alat yang dibutuhkan:
Mesin pres hidrolik
Cetakan press cakram
Jangka Sorong Vernier3
3
Sinter 1 hour at 1000 °C and furnace-cool
Sinter 1 hour at 1000 °C and furnace-cool
Sinter the discs in air for 1 hour at 1000 °C, then let them cool in the furnace to room temperature (about 15-30 °C). Above 1200 °C the disc loses its nonlinearity.
Alat yang dibutuhkan:
Tungku Muffle4
4
Lap both faces to 0.5 mm
Lap both faces to 0.5 mm
Lap both faces with 600-mesh silicon carbide until the disc is 0.5 mm thick.
Alat yang dibutuhkan:
Butiran silikon karbidaJangka Sorong Vernier5
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. Unknown: the spraying method and the paint.
Material untuk langkah ini:
Batangan aluminium1 as required
Cat perak penghantar listrik1 as required
Kawat Tembaga2 buahAlat yang dibutuhkan:
Metode semprot logam yang tidak diketahuiJangka Sorong VernierBahan
5- 9.887 gPlaceholder
- 0.113 gPlaceholder
- 1 as requiredPlaceholder
- 1 as requiredPlaceholder
- 2 buahPlaceholder
Alat yang Diperlukan
9- Placeholder
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