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Metal Oxide Varistor: Zinc Oxide with 0.5 % Barium Oxide, Bismuth-Manganese Oxide Paste Fired On (Masuyama 1972, Ex. 7)
A varistor whose bismuth oxide and manganese dioxide are both fired on from a paste: 99.5 % zinc oxide with 0.5 % barium oxide by moles, sintered at 1350 °C, coated with a 70 : 30 bismuth oxide and manganese dioxide paste and fired at 800 °C. The disc measured a C-value of 77 at 1 mA and a nonlinearity exponent n of 43.1.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 7. 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 99.5 : 0.5 and wet-mill 5 hours
Weigh 99.5 : 0.5 and wet-mill 5 hours
Mix zinc oxide and barium oxide 99.5 : 0.5 by moles. Ours, for 10 g: 9.906 g zinc oxide, 0.094 g barium oxide (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 Ọ́ksídì9.906 g
Barium oxide0.094 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
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 7 gives no thickness.
Àwọn irinṣẹ́ tí a nílò:
Ọkà kaboidi silikoniKálípà Fáníà5
5
Coat with bismuth and manganese oxide paste, fire at 800 °C
Coat with bismuth and manganese oxide paste, fire at 800 °C
Coat both lapped faces with a paste whose solids are 70 % bismuth oxide and 30 % manganese dioxide by weight, and fire it in air at 800 °C for 30 minutes. Example 7 does not name the paste's liquid; ours: the epoxy-resin butyl-alcohol solution of Example 4. Not given: how much paste.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Bismuth oxide1 as required
Dioksidi manganesi (pirolusiti)1 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
7- 9.906 gÀyè
- 0.094 gÀyè
- 1 as requiredÀyè
- 1 as requiredÀyè
- 1 as 3.2 mm spray wireÀyè
- 1 as requiredÀyè
- 2 ẹyọÀyè
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