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INDOSSABILI
Fired Silver Paint: Precipitated Silver and Flux in Polyvinyl Alcohol with Ammonia (Gray, Erie Resistor 1954, Ex. 1)
A paint for putting silver electrodes on ceramic, glass or mica. Fine silver powder and a little ceramic flux are held in polyvinyl alcohol dissolved in water, with a trace of ammonia to make the wet paint conduct. So a capacitor can be measured while it is being painted. On firing, the silver becomes a film held on by the flux. The silver settles, so stir while painting.
Source: Robert B. Gray, US 2,695,275 (Erie Resistor, 1954), Example 1. Not given: how the silver was precipitated, which flux, the form of the ammonia, and the firing heat. Ours: precipitated silver made by reducing silver chloride with zinc, bismuth subnitrate as the flux (one Gray names), and strong ammonia water. Picture drawn by Youblob.
Principiante
1 day
Istruzioni
1
1
Dissolve 4 g polyvinyl alcohol in the water
Dissolve 4 g polyvinyl alcohol in the water
For 100 g of paint: dissolve 4 g polyvinyl alcohol in the water, warming it to help it dissolve. The water is the balance, about 35 to 44 g. Warming is ours.
Materiali per questo passaggio:
Alcol polivinilico in polvere4 g
Acqua distillata1 as requiredStrumenti necessari:
Bilancia a bracci
Becher in borosilicato
Piastra riscaldante
Bacchetta in vetro borosilicato2
2
Grind in 50 g precipitated silver and the flux
Grind in 50 g precipitated silver and the flux
Grind 50 g precipitated silver and 2 to 10 g ceramic flux into the solution until smooth. Gray allows some silver chloride left in the silver. Ours: silver from the zinc route, and bismuth subnitrate, one of the fluxes Gray names. The right amount of flux depends on the ceramic.
Materiali per questo passaggio:
Argento precipitato50 g
Subnitrato di bismuto1 as requiredStrumenti necessari:
Bilancia a bracci
Mortaio e pestello
Guanti in nitrile3
3
Add 0.2 to 1 % ammonia
Add 0.2 to 1 % ammonia
Stir in ammonia, 0.2 to 1 % of the paint. It evaporates from the film but makes the wet paint conduct. Ours: added as strong ammonia water. Sharp fumes: work in air, goggles.
Materiali per questo passaggio:
Soluzione di ammoniaca al 25-28 %1 as requiredStrumenti necessari:
Bacchetta in vetro borosilicato
Occhiali antispruzzo chimicoGuanti in nitrile4
4
Stir while painting
Stir while painting
The silver in this paint settles, so stir it while it is being applied.
Strumenti necessari:
Bacchetta in vetro borosilicatoMateriali
5- Segnaposto
- 1 as requiredSegnaposto
- Segnaposto
- 1 as requiredSegnaposto
- 1 as requiredSegnaposto
Strumenti richiesti
7- Segnaposto
- Segnaposto
- Segnaposto
- Segnaposto
- Segnaposto
- Segnaposto
- Segnaposto
Questo progetto realizza
Blueprint correlati
Questi blueprint condividono conoscenze — tecniche, materiali o principi
Precipitated Silver: Silver Chloride Reduced by Zinc in Acidulated Water (Thorpe 1913)
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Bismuth Subnitrate: Bismuth through Nitrate and Carbonate to the White Powder (USP 1870)
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Polyvinyl Alcohol: Polyvinyl Acetate Stirred in Alcoholic Potash
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Ammonia Water: Sal Ammoniac and Lime, Gas Caught in Cold Water
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