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Metal Oxide Varistor: Zinc Oxide with 5 % Bismuth Oxide, 1100 °C, 1.0 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 5 mole % bismuth oxide, sintered at 1100 °C and lapped to 1.0 mm, the disc measured a C-value of 65 at 1 mA and a nonlinearity exponent n of 3.3.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 1. Unknown: what the silver paint is. The patent calls the spraying and the paint well known. 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.
Abantado
1 day
Mga Tagubilin
1
1
Weigh 95 : 5 and wet-mill 5 hours
Weigh 95 : 5 and wet-mill 5 hours
Mix zinc oxide and bismuth oxide 95 : 5 by moles. Ours, for 10 g: 7.684 g zinc oxide, 2.316 g bismuth oxide (our arithmetic). Mill wet for 5 hours, then dry. Unknown: the milling liquid.
Mga materyales para sa hakbang na ito:
Pulbos ng Zinc Oxide7.684 g
Bismuth oxide2.316 gMga kailangang kasangkapan:
Timbangang panimbang
Gilingang Bolang Bakal
Hurnong pantuyo2
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.
Mga kailangang kasangkapan:
Haydroliko na pandiin
Hulmahan sa pagpindot ng disk
Kalipers na Vernier3
3
Sinter 1 hour at 1100 °C and furnace-cool
Sinter 1 hour at 1100 °C and furnace-cool
Sinter the discs in air for 1 hour at 1100 °C, then let them cool in the furnace to room temperature (about 15-30 °C).
Mga kailangang kasangkapan:
Muffle furnace4
4
Lap both faces to 1.0 mm
Lap both faces to 1.0 mm
Lap both faces with 600-mesh silicon carbide until the disc is 1.0 mm thick.
Mga kailangang kasangkapan:
Butil ng silicon carbideKalipers na 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.
Mga materyales para sa hakbang na ito:
Bareta ng aluminyo1 as 3.2 mm spray wire
Pinturang pilak na nagdadala ng kuryente1 as required
Kawad na Tanso2 pirasoMga kailangang kasangkapan:
Kalipers na Vernier
Baril na pang-spray na may arko ng kawad
Pang-industriyang panipil ng hanginMga Materyales
5- 7.684 gPlaceholder
- 2.316 gPlaceholder
- 1 as 3.2 mm spray wirePlaceholder
- 1 as requiredPlaceholder
- 2 pirasoPlaceholder
Mga Kinakailangang Kasangkapan
10- Placeholder
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