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SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
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.
Mwanzo
1 day
Maagizo
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.
Vifaa kwa hatua hii:
Dekstrini iliyosafishwa4 g
Maji yaliyosafishwa kwa mvuke1 as requiredZana zinazohitajika:
Mizani ya mizani-mbili
Bikari ya Borosilikati
Fimbo ya Kioo cha Borosilikati2
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.
Vifaa kwa hatua hii:
Oksidi ya fedha50 g
Bismuthi subnitrati1 as requiredZana zinazohitajika:
Mizani ya mizani-mbili
Kinu na mchi
Glavu za Naitrili3
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.
Vifaa kwa hatua hii:
Nitrati ya Fedha1 as requiredZana zinazohitajika:
Mizani ya mizani-mbiliFimbo ya Kioo cha BorosilikatiGlavu za NaitriliVifaa
5- Kishikilia Nafasi
- 1 as requiredKishikilia Nafasi
- 50 gKishikilia Nafasi
- 1 as requiredKishikilia Nafasi
- 1 as requiredKishikilia Nafasi
Zana Zinazohitajika
5- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
Silver Oxide: Silver Nitrate Precipitated with Solution of Potassa (USP 1870)
na Charlie
Viwandani
8
0
0
0
0
0
Hatari
Bismuth Subnitrate: Bismuth through Nitrate and Carbonate to the White Powder (USP 1870)
na Charlie
Viwandani
1
0
0
0
0
0
Dextrin: Starch Moistened with Dilute Nitric Acid and Heated at 110-120 °C (Payen, in Thorpe 1912)
na Charlie
Viwandani
6
0
0
0
0
0
CC0 Umma Wote
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