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Metal Oxide Varistor: Pure Zinc Oxide at 1350 °C, Bismuth Oxide Paste Fired at 1300 °C (Masuyama 1972, Ex. 4)
A varistor made the other way round: a disc of pure zinc oxide, sintered, with bismuth oxide fired into its faces from a paste instead of mixed in. Sintered at 1350 °C and fired with the paste at 1300 °C, the disc measured a C-value of 24 at 1 mA and a nonlinearity exponent n of 2.6. Masuyama found that firing on the bismuth oxide paste raises n a great deal over mixing it in.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 4. 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
Press pure zinc oxide at 340 kg/cm²
Press pure zinc oxide at 340 kg/cm²
Press zinc oxide powder at 340 kg/cm². Example 4 gives no disc size; ours: discs 13 mm across and 2.5 mm thick in the mould of Example 1.
此步骤所需材料：
氧化锌粉末1 as required所需工具：
等臂天平
液压机
圆片压模
游标卡尺2
2
Sinter 1 hour at 1350 °C and cool
Sinter 1 hour at 1350 °C and cool
Heat the pressed disc for 1 hour at 1350 °C, then let it cool to room temperature.
所需工具：
马弗炉3
3
Lap both faces
Lap both faces
Lap both faces with silicon carbide abrasive. Example 4 gives no thickness.
所需工具：
碳化硅磨料游标卡尺4
4
Coat with bismuth oxide paste and fire at 1300 °C
Coat with bismuth oxide paste and fire at 1300 °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 1300 °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5
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, 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
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