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Fired Silver Paint: Silver Oxide Paint with Silver Nitrate Added Just Before Use (Gray, Erie Resistor 1954, Ex. 5)
A paint for putting silver electrodes on ceramic, glass or mica. Silver oxide and a little ceramic flux are held in polyvinyl alcohol 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. This version adds up to 3 % silver nitrate just before use, which makes the wet paint conduct better.
Source: Robert B. Gray, US 2,695,275 (Erie Resistor, 1954), Example 5. 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 2 g polyvinyl alcohol in the water
Dissolve 2 g polyvinyl alcohol in the water
For 100 g of paint: dissolve 2 g polyvinyl alcohol in the water, warming it to help it dissolve. The water is the balance, about 34 to 44 g. Warming is ours.
Mga materyales para sa hakbang na ito:
Pulbos na polyvinyl alcohol2 g
Distiladong Tubig1 as requiredMga kailangang kasangkapan:
Timbangang panimbang
Basong Borosilikato
Pang-init na Plato
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
Add 2 to 4 g alcohol against foam
Add 2 to 4 g alcohol against foam
Stir in 2 to 4 g ethyl alcohol. It stops the polyvinyl alcohol from foaming.
Mga materyales para sa hakbang na ito:
Etanol - antas laboratoryo, 95 %1 as requiredMga kailangang kasangkapan:
Baras na Salaming Borosilicate4
4
Add up to 3 g silver nitrate just before use
Add up to 3 g silver nitrate just before use
Just before painting, stir in 0 to 3 g silver nitrate. With polyvinyl alcohol it must go in immediately before use, or it breaks the binder down. 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
6- Placeholder
- 1 as requiredPlaceholder
- 50 gPlaceholder
- 1 as requiredPlaceholder
- 1 as requiredPlaceholder
- 1 as requiredPlaceholder
Mga Kinakailangang Kasangkapan
6- Placeholder
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