10:23 Sep 13, 2015 |
German to English translations [PRO] Tech/Engineering - Mining & Minerals / Gems | |||||||
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Summary of answers provided | ||||
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3 +1 | reaction solder |
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3 | colloidal (eutectic) soldering |
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reaction solder Explanation: Hi there, I think the term reaction solder is the one you are looking for. I going to add a link, I hope this helps. Greetings -------------------------------------------------- Note added at 2 hrs (2015-09-13 12:55:40 GMT) -------------------------------------------------- It should say: I am going...sorry! Reference: http://www.jewels-gems-clocks-watches.com/gemdict_en/index.p... |
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colloidal (eutectic) soldering Explanation: Anschließend kommt das Werkstück in einen Ofen und die Temperatur wird langsam gesteigert. Bei ca. 100°C verwandelt sich da Kupfersalz in schwarzes Oxid, bei 600°C verkohlt der Leim und bei etwa 850°C erfolgt die durch die Kohle bewirkte Reduktion des Kupfersalzes zu metallischem Kupfer. Bei 890°C legieren sich Gold und Kupfer und es entsteht eine feste Verbindung. Dieser Vorgang wird als Reaktionslötung bezeichnet. http://goldschmiede-plaar.de/2013/03/08/granulieren-technik-... Colloidal or eutectic soldering is a technique that makes use of a colloidal mixture of organic glue and copper salts such as cupric carbonate or copper coating granules. This compound lowers the melting temperature of the two metals in contact (the granules and the base) after which the copper diffuses into both at the point of contact when fired in a reducing atmosphere. The glue burns away releasing the copper salt from the compound. The copper diffuses into the granules and the base linking them together. https://jewelrystudiesintl.wordpress.com/2012/02/29/what-is-... -------------------------------------------------- Note added at 2 hrs (2015-09-13 13:21:32 GMT) -------------------------------------------------- Probable technique: In the early 20th century, jewelers determined the ancients probably used a technique known as colloidal (non-metallic) hard soldering or fusion welding. Essentially, the process involves mixing an organic glue (perhaps fish paste or cowhide glue – both known to the ancients) with a powdered copper mineral (possibly malachite) and using it to fix grains of gold in place on the gold sheet. When the prepared piece is heated in a reducing atmosphere (where there is little or no oxygen present), a chemical change occurs between the glue and the copper oxide. http://www.jckonline.com/1995/05/01/granulation-reviving-anc... |
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