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Fired Silver Paint: Silver Oxide and Flux in Purified Dextrin and Water (Gray, Erie Resistor 1954, Ex. 3)
A paint for putting silver electrodes on ceramic, glass or mica. Silver oxide and a little ceramic flux are held in purified dextrin dissolved in water. The wet paint conducts electricity, so a capacitor can be measured while it is being painted. On firing, the silver oxide turns into a silver film held on by the flux. Dextrin needs no alcohol against foam, and silver nitrate does not attack it while the paint is in use.
Source: Robert B. Gray, US 2,695,275 (Erie Resistor, 1954), Example 3. Unknown: how the dextrin is purified. Gray does not give it. Also not given: which flux, and the firing heat. Bismuth subnitrate, one of the fluxes Gray names, is ours. Picture drawn by Youblob.
Baguhan
1 day
Mga Tagubilin
1
1
Dissolve 4 g purified dextrin in the water
Dissolve 4 g purified dextrin in the water
For 100 g of paint: dissolve 4 g purified dextrin in the water. The water is the balance, about 31 to 44 g. Unknown: how the dextrin is purified. Gray does not give it.
Mga materyales para sa hakbang na ito:
Dinalisay na dextrin4 g
Distiladong Tubig1 as requiredMga kailangang kasangkapan:
Timbangang panimbang
Basong Borosilikato
Baras na Salaming Borosilicate2
2
Grind in silver oxide and flux
Grind in silver oxide and flux
Grind 50 g precipitated silver oxide and 2 to 10 g ceramic flux into the solution until smooth. Gray gives the flux only as a class; ours: bismuth subnitrate, one of the common fluxes he names. The right amount depends on the ceramic it will be fired onto.
Mga materyales para sa hakbang na ito:
Silver oxide50 g
Bismuth subnitrate1 as requiredMga kailangang kasangkapan:
Timbangang panimbang
Almires at Panghalo
Gwantes na Nitrile3
3
Stir in up to 5 g silver nitrate
Stir in up to 5 g silver nitrate
Stir in 0 to 5 g silver nitrate; it makes the wet paint conduct better. Dextrin is not attacked by it in normal use, and the paint can stand for hours without stirring. Silver nitrate stains and burns skin: gloves.
Mga materyales para sa hakbang na ito:
Silver Nitrate1 as requiredMga kailangang kasangkapan:
Timbangang panimbangBaras na Salaming BorosilicateGwantes na NitrileMga Materyales
5- Placeholder
- 1 as requiredPlaceholder
- 50 gPlaceholder
- 1 as requiredPlaceholder
- 1 as requiredPlaceholder
Mga Kinakailangang Kasangkapan
5- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
Ang blueprint na ito ay gumagawa ng
Kaugnay na Blueprint
Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo
Silver Oxide: Silver Nitrate Precipitated with Solution of Potassa (USP 1870)
ni Charlie
Industriyal
14
0
0
0
0
0
Mapanganib
Bismuth Subnitrate: Bismuth through Nitrate and Carbonate to the White Powder (USP 1870)
ni Charlie
Industriyal
6
0
0
0
0
0
Dextrin: Starch Moistened with Dilute Nitric Acid and Heated at 110-120 °C (Payen, in Thorpe 1912)
ni Charlie
Industriyal
14
0
0
0
0
0
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