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Metal Oxide Varistor: Zinc Oxide with 0.05 % Manganese Dioxide, Bismuth Oxide Paste Fired On (Masuyama 1972, Ex. 5)
A varistor with bismuth oxide fired on from a paste instead of mixed in: 99.95 % zinc oxide with 0.05 % manganese dioxide by moles, sintered at 1350 °C, coated with bismuth oxide paste and fired at 800 °C. The disc measured a C-value of 96 at 1 mA and a nonlinearity exponent n of 8.4.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 5. Unknown: what the silver paint is, and how strong the epoxy solution of the paste 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
2 days
Ìlànà
1
1
Weigh 99.95 : 0.05 and wet-mill 5 hours
Weigh 99.95 : 0.05 and wet-mill 5 hours
Mix zinc oxide and manganese dioxide 99.95 : 0.05 by moles. Ours, for 10 g: 9.995 g zinc oxide and 0.005 g manganese dioxide (our arithmetic). Mill wet for 5 hours, then dry, as in Example 1. Unknown: the milling liquid.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Lulú Sínkì Ọ́ksídì9.995 g
Dioksidi manganesi (pirolusiti)0.005 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 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
As in Example 2: sinter in air at 1350 °C for 1 hour and let the discs cool in the furnace.
Àwọn irinṣẹ́ tí a nílò:
Ààrò muffle4
4
Lap both faces
Lap both faces
Lap both faces with silicon carbide abrasive. Example 5 gives no thickness.
Àwọn irinṣẹ́ tí a nílò:
Ọkà kaboidi silikoniKálípà Fáníà5
5
Coat with bismuth oxide paste and fire at 800 °C
Coat with bismuth oxide paste and fire at 800 °C
Coat both lapped faces with a paste of 50 % by weight bismuth oxide in a solution of epoxy resin in butyl alcohol, and fire it in air at 800 °C for 30 minutes. The bismuth oxide diffuses into the zinc oxide. Not given: how much paste, or the strength of the epoxy solution.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Bismuth oxide1 as requiredÀwọn irinṣẹ́ tí a nílò:
Resini epoxy
n-ButanolÀàrò muffle6
6
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, as in Example 1. 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
6- 9.995 gÀyè
- Àyè
- 1 as requiredÀyè
- 1 as 3.2 mm spray wireÀyè
- 1 as requiredÀyè
- 2 ẹyọÀyè
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