PL37640B1 - - Google Patents
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- Publication number
- PL37640B1 PL37640B1 PL37640A PL3764054A PL37640B1 PL 37640 B1 PL37640 B1 PL 37640B1 PL 37640 A PL37640 A PL 37640A PL 3764054 A PL3764054 A PL 3764054A PL 37640 B1 PL37640 B1 PL 37640B1
- Authority
- PL
- Poland
- Prior art keywords
- powder
- silver
- metal
- solution
- rotating
- Prior art date
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 8
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 239000004332 silver Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 239000001648 tannin Substances 0.000 claims description 3
- 235000018553 tannin Nutrition 0.000 claims description 3
- 229920001864 tannin Polymers 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000008021 deposition Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910000510 noble metal Inorganic materials 0.000 claims 1
- 239000012266 salt solution Substances 0.000 claims 1
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 claims 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010946 fine silver Substances 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(I) nitrate Inorganic materials [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
Przedmiotem wynalazku jest sposób wytwarza¬ nia bardzo drobnego i miekkiego proszku srebra.Proszek taki stosowany jest przewaznie do sreb¬ rzenia potencjometrów radiowych. Dla otrzymania jednolitej i gladkiej powloki lakieru srebrnego konieczne jest duze rozdrobnienie zlarn, dla dal¬ szej zas obróbki powloki (szlifowanie, polerowanie) korzystna jest miekkosc i plastycznosc proszku.Proszek srebrny otrzymuje sie zwykle droga elektrochemicznego stracenia srebra z roztworu wodnego jego soli (np. AgN03) na powierzchni metalu lub stopu mniej szlachetnego (np. miedzi lub mosiadzu). Wielkosc ziarn proszku zalezy od wielu trudnych do regulowania czynników jak pH roztworu, szybkosci osadzania i innych.Stwierdzono, ze miekki i odpowiednio drobny proszek srebra otrzymuje sie zawsze przy do¬ datku do elektrolitu pewnej ilosci taniny. Korzy¬ stne jest poza tym osadzanie proszku na obraca¬ jacej sie lub wibrujacej spirali. Zapobiega to two¬ rzeniu sie zwartych warstw srebra zamiast proszku.Przyklad: 50 g srebra rozpuszcza sie w mozliwie malej ilosci kwasu azotowego (c. wl. 1,25). Nastepnie roztwór rozciencza sie woda do objetosci 1 litra i dodaje 0,5 g taniny.Stracanie proszku srebra nastepuje przy pomo¬ cy obracajacej sie spirali z drutu miedzianego o srednicy 5 mm.Uzyskany proszek odznacza sie bardzo drobnym ziarnem i duza plastycznoscia. PLThe present invention relates to a process for the production of a very fine and soft silver powder. Such powder is mainly used for silvering radio potentiometers. In order to obtain a uniform and smooth silver lacquer coating, a large fineness of fineness is necessary, while for further processing of the coating (grinding, polishing) the softness and plasticity of the powder are favorable. Silver powder is usually obtained by electrochemical loss of silver from an aqueous solution of its salt (e.g. AgN03) on the surface of a metal or a less noble alloy (e.g. copper or brass). The grain size of the powder depends on many factors that are difficult to control, such as the pH of the solution, the rate of deposition, etc. It has been found that a soft and suitably fine silver powder is always obtained with the addition of a certain amount of tannin to the electrolyte. It is also advantageous to deposit the powder on a rotating or vibrating spiral. This prevents the formation of a compact layer of silver instead of a powder. Example: 50 g of silver is dissolved in as little nitric acid (c. 1.25). The solution is then diluted with water to a volume of 1 liter and 0.5 g of tannin is added. The silver powder is lost by a rotating spiral made of copper wire with a diameter of 5 mm. The resulting powder has a very fine grain and high plasticity. PL
Claims (2)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL37640B1 true PL37640B1 (en) | 1954-08-15 |
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