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TEKNOLOJIA
VAZI
Metal Oxide Varistor: Zinc Oxide, 0.5 % Bismuth Oxide, 0.03 % Manganese Dioxide, 1350 °C (Masuyama 1972, Ex. 2)
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 manganese dioxide: 99.47 % zinc oxide, 0.5 % bismuth oxide and 0.03 % manganese dioxide by moles, sintered at 1350 °C. The disc measured a C-value of 16 at 1 mA and a nonlinearity exponent n of 2.6.
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.
Juu
1 day
Maagizo
1
1
Weigh 99.47 : 0.5 : 0.03 and wet-mill 5 hours
Weigh 99.47 : 0.5 : 0.03 and wet-mill 5 hours
Mix zinc oxide, bismuth oxide and manganese dioxide 99.47 : 0.5 : 0.03 by moles. Ours, for 10 g: 9.717 g zinc oxide, 0.28 g bismuth oxide, 0.003 g manganese dioxide (our arithmetic). Mill wet for 5 hours, then dry. Unknown: the milling liquid.
Vifaa kwa hatua hii:
Poda ya oksidi ya zinki9.717 g
Oksidi ya bismuthi0.28 g
Dioksidi ya manganizi (pairolusiti)0.003 gZana zinazohitajika:
Mizani ya mizani-mbili
Kinu cha mipira ya chuma
Tanuri la kukaushia2
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.
Zana zinazohitajika:
Mashine ya kubana ya haidroliki
Kalibu ya kubana diski
Kalipa 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 for 1 hour at 1350 °C, then let them cool in the furnace to room temperature (about 15-30 °C).
Zana zinazohitajika:
Tanuri 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.
Zana zinazohitajika:
Chembechembe za kabidi ya silikoniKalipa 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.
Vifaa kwa hatua hii:
Kitalu cha alumini1 as 3.2 mm spray wire
Rangi ya fedha inayopitisha umeme1 as required
Waya wa Shaba2 vipandeZana zinazohitajika:
Kalipa ya Vernier
Bunduki ya kunyunyiza kwa tao la waya
Kibanio hewa cha kiwandaVifaa
6- 9.717 gKishikilia Nafasi
- 0.28 gKishikilia Nafasi
- Kishikilia Nafasi
- 1 as 3.2 mm spray wireKishikilia Nafasi
- 1 as requiredKishikilia Nafasi
- 2 vipandeKishikilia Nafasi
Zana Zinazohitajika
10- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
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