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ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
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ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
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.
Olùbẹ̀rẹ̀
1 day
Ìlànà
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Dẹ́kísítírínì tí a sọ di mímọ́4 g
Omi Àyọ́1 as requiredÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ago Bórósílíkéètì
Ọ̀pá Gíláàsì 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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ọ̀ksáídì fàdákà50 g
Bismuth subnitrate1 as requiredÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Odó àti Ọmọ Odó
Ìbọ̀wọ́ Nítírílì3
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Silver Nitrate1 as requiredÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gbaỌ̀pá Gíláàsì BorosilicateÌbọ̀wọ́ NítírílìÀwọn ohun-èlò
5- 1 as requiredÀyè
- 50 gÀyè
- 1 as requiredÀyè
- 1 as requiredÀyè
Àwọn irinṣẹ́ tó nílò
5Ìtọ́nisọ́nà yìí ń ṣe
Blueprint tó jọra
Àwọn blueprint wọ̀nyí pín ìmọ̀ — ọ̀nà, ohun-èlò tàbí ìlànà
Silver Oxide: Silver Nitrate Precipitated with Solution of Potassa (USP 1870)
láti ọwọ́ Charlie
Ti Ilé-iṣẹ́
10
0
0
0
0
0
Léwu
Bismuth Subnitrate: Bismuth through Nitrate and Carbonate to the White Powder (USP 1870)
láti ọwọ́ Charlie
Ti Ilé-iṣẹ́
5
0
0
0
0
0
Dextrin: Starch Moistened with Dilute Nitric Acid and Heated at 110-120 °C (Payen, in Thorpe 1912)
láti ọwọ́ Charlie
Ti Ilé-iṣẹ́
8
0
0
0
0
0
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