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Fired Silver Paint: Silver Oxide Paint with Silver Nitrate Added Just Before Use (Gray, Erie Resistor 1954, Ex. 5)
Ed

Imeundwa na

Ed

28. Oktoba 2026FI
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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.
Mwanzo
1 day

Maagizo

1

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.

Vifaa kwa hatua hii:

Unga wa polivinili alkoholiUnga wa polivinili alkoholi2 g
Maji yaliyosafishwa kwa mvukeMaji yaliyosafishwa kwa mvuke1 as required

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Bikari ya BorosilikatiBikari ya Borosilikati
Sahani ya Kupasha JotoSahani ya Kupasha Joto
Fimbo ya Kioo cha BorosilikatiFimbo ya Kioo cha Borosilikati
2

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.

Vifaa kwa hatua hii:

Oksidi ya fedhaOksidi ya fedha50 g
Bismuthi subnitratiBismuthi subnitrati1 as required

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Kinu na mchiKinu na mchi
Glavu za NaitriliGlavu za Naitrili
3

Add 2 to 4 g alcohol against foam

Stir in 2 to 4 g ethyl alcohol. It stops the polyvinyl alcohol from foaming.

Vifaa kwa hatua hii:

Etanoli ya maabara, 95 %Etanoli ya maabara, 95 %1 as required

Zana zinazohitajika:

Fimbo ya Kioo cha BorosilikatiFimbo ya Kioo cha Borosilikati
4

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.

Vifaa kwa hatua hii:

Nitrati ya FedhaNitrati ya Fedha1 as required

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Fimbo ya Kioo cha BorosilikatiFimbo ya Kioo cha Borosilikati
Glavu za NaitriliGlavu za Naitrili

Vifaa

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Zana Zinazohitajika

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Silver Oxide: Silver Nitrate Precipitated with Solution of Potassa (USP 1870)

Silver Oxide: Silver Nitrate Precipitated with Solution of Potassa (USP 1870)

na CharlieDE

Viwandani

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Bismuth Subnitrate: Bismuth through Nitrate and Carbonate to the White Powder (USP 1870)
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Bismuth Subnitrate: Bismuth through Nitrate and Carbonate to the White Powder (USP 1870)

na CharlieDE

Viwandani

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