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Metal Oxide Varistor: Zinc Oxide with Manganese and Titanium Oxides, Bismuth Paste Fired On (Masuyama 1972, Ex. 6)
A varistor with manganese dioxide and titanium dioxide mixed into the zinc oxide, and bismuth oxide fired on from a paste: 99.0 % zinc oxide, 0.5 % manganese dioxide and 0.5 % titanium dioxide by moles, sintered at 1350 °C, coated with bismuth oxide paste and fired at 800 °C. The disc measured a C-value of 66 at 1 mA and a nonlinearity exponent n of 13.7.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 6. 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 : 0.5 : 0.5 and wet-mill 5 hours
Weigh 99 : 0.5 : 0.5 and wet-mill 5 hours
Mix zinc oxide, manganese dioxide and titanium dioxide 99 : 0.5 : 0.5 by moles. Ours, for 10 g: 9.898 g zinc oxide, 0.053 g manganese dioxide, 0.049 g titanium 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9.898 克
二氧化锰（软锰矿）0.053 克
二氧化钛0.049 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
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 6 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
7- 9.898 克占位符
- 0.053 克占位符
- 0.049 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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