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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: how the aluminium is sprayed on, what the silver paint is, and how strong the epoxy solution of the paste is. The 10 g batch is our arithmetic. Picture: the patent's drawing.
高级
2 days
说明
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.
此步骤所需材料：
氧化锌粉末9.995 克
二氧化锰（软锰矿）0.005 克所需工具：
等臂天平
铁球磨机
干燥炉2
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.
所需工具：
液压机
圆片压模
游标卡尺3
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.
所需工具：
马弗炉4
4
Lap both faces
Lap both faces
Lap both faces with silicon carbide abrasive. Example 5 gives no thickness.
所需工具：
碳化硅磨料游标卡尺5
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.
此步骤所需材料：
氧化铋1 as required所需工具：
环氧树脂
正丁醇马弗炉6
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. Unknown: the spraying method and the paint.
此步骤所需材料：
铝锭1 as required
银导电漆1 as required
铜线2 个所需工具：
未知的金属喷涂方法游标卡尺材料
6- 9.995 克占位符
- 0.005 克占位符
- 1 as required占位符
- 1 as required占位符
- 1 as required占位符
- 2 个占位符
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