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Metal Oxide Varistor: Zinc Oxide with Bismuth and Chromic Oxides, 1350 °C (Masuyama 1972)
Masuyama, Matsuoka and Nishi found that adding a second oxide to zinc oxide and bismuth oxide changes the varistor a great deal. This is their Example 2 with chromic oxide: 99.0 % zinc oxide, 0.5 % bismuth oxide and 0.5 % chromic oxide by moles, sintered at 1350 °C. The disc measured a C-value of 178 at 1 mA and a nonlinearity exponent n of 14.2.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 2. 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.
Hejuru
1 day
Amabwiriza
1
1
Weigh 99.0 : 0.5 : 0.5 and wet-mill 5 hours
Weigh 99.0 : 0.5 : 0.5 and wet-mill 5 hours
Mix zinc oxide, bismuth oxide and chromic oxide 99.0 : 0.5 : 0.5 by moles. Ours, for 10 g: 9.631 g zinc oxide, 0.278 g bismuth oxide, 0.091 g chromic oxide (our arithmetic). Mill wet for 5 hours, then dry. Unknown: the milling liquid.
Ibikoresho by'iyi ntambwe:
Ifu ya oxide ya zinki9.631 g
Bisimuti okiside0.278 g
Okiside ya Kromu0.091 gIbikoresho bikenewe:
Umunzani w'ibiro
Urusyo rw'imipira y'icyuma
Ifuru yo kumishaho2
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.
Ibikoresho bikenewe:
Imashini ikanda ikoresha amazi
Ifumbiro ryo gukanda disiki
Kalipe ya Vernier3
3
Sinter 1 hour at 1350 °C and furnace-cool
Sinter 1 hour at 1350 °C and furnace-cool
Sinter the discs in air at 1350 °C for 1 hour, then let them cool in the furnace to room temperature (about 15-30 °C).
Ibikoresho bikenewe:
Ifuru ya 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.
Ibikoresho bikenewe:
Udukombe twa karubide ya silikoniKalipe ya 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. 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.
Ibikoresho by'iyi ntambwe:
Igice cya aluminiyumu1 as 3.2 mm spray wire
Irangi rya feza rinyuza amashanyarazi1 as required
Insinga y'Umuringa2 ibiceIbikoresho bikenewe:
Kalipe ya Vernier
Imbunda yo kumisha ukoresheje urumuri rw'insinga
Igikandamiza umwuka cy'ingandaIbikoresho
6- 9.631 gUmwanya
- 0.278 gUmwanya
- 0.091 gUmwanya
- 1 as 3.2 mm spray wireUmwanya
- 1 as requiredUmwanya
- 2 ibiceUmwanya
Ibikoresho bikenewe
10- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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