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Ceramic Disc Capacitors: Barium Titanate with Nickel Stannate, Pressed, Fired and Silvered (Coffeen, US 2,789,061)
Barium titanate with 3 mole % nickel stannate is calcined, pressed into small discs and fired hard. Silver is fired onto both faces and a lead soldered to each, giving ceramic disc capacitors of high capacity for their size.
Result: discs 3/8 inch across and about 1/10 inch thick with a dielectric constant averaging 2380 and a dissipation factor of 0.58 %. Between 25 and 85 °C the dielectric constant rose at most 17 % and fell at most 7 %.
Source: W. W. Coffeen (Metal & Thermit Corp.), US 2,789,061 (1957). Unknown: how the barium titanate, the nickel stannate and the tinned lead wire are made; the patent uses them ready-made. Picture: Wikimedia Commons.
高级
10 days
说明
1
1
Weigh and slurry
Weigh and slurry
Weigh 19.32 g of barium titanate and 0.68 g of hydrated nickel stannate (about NiSnO3·2H2O), which is 97 mole % BaTiO3 and 3 mole % NiSnO3. Slurry them with 50 cc of distilled water. The patent prefers 2 to 4 mole % nickel stannate; 1 to 15 % works.
此步骤所需材料：
钛酸钡19.32 克
锡酸镍0.68 克所需工具：
蒸馏水
精密数字天平
蒸发皿2
2
Dry, sieve and calcine
Dry, sieve and calcine
Dry the slurry, crush it to pass a 50 mesh screen, moisten it with 5 % of a 2 1/2 % starch solution and press it into one slug. Calcine the slug for one hour at 1600 °F (871 °C). Ours: potato starch, a drying oven, mortar and pestle.
所需工具：
马铃薯淀粉
干燥炉
研钵与研杵
粗筛
液压机
高温窑3
3
Press the discs
Press the discs
Grind the calcine to pass a 325 mesh screen, moisten it again with starch solution, and press small discs 3/8 inch in diameter and about 1/10 inch thick at 20,000 pounds per square inch.
所需工具：
研钵与研杵
细目筛马铃薯淀粉液压机
圆片压模4
4
Fire on platinum
Fire on platinum
Fire the discs on platinum foil at 2400 °F (1316 °C) for one hour. They come out with zero absorption.
所需工具：
高温窑
铂5
5
Silver and lead
Silver and lead
Paint silver paint on both faces and fire the discs at 1350 °F (732 °C) for one hour. Solder tinned copper lead wires directly to the silver electrodes. Age at least a week before measuring. Ours: a fine brush and a soldering iron.
此步骤所需材料：
烧结银浆1 both faces
镀锡铜线2 leads per disc
焊锡丝1 a little所需工具：
细尖画笔高温窑
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