Spitting
In metallurgy, spattering refers to the process of gas escaping when molten metals solidify .
Metals have the physical property of absorbing gases , primarily oxygen and hydrogen , in limited quantities in the melt in their liquid state . During the solidification process, the gases are then separated from the still liquid core through the partially solidified cover and thus carry away some of the liquid metal. The result is a porous, blistered inner structure of the solidified body and a “cauliflower” -like surface.
The resulting noise of the splashing gas leak gave the process its name.
The spattering is mainly observed with pure silver , copper and rhodium , but it also occurs with other metals such as e.g. B. steel .
This effect can be almost completely eliminated, especially with silver, by adding small amounts of alloy components .
Web links
- Spratzen in Pierer's Universal Lexikon from 1857
- Spratzen in Brockhaus from 1911
- Spratzen in Meyer's Large Conversation Lexicon from 1905
- Spratzen in the universal lexicon
Individual evidence
- ↑ Der Neue Herder from A to Z, second half volume: M to Z, Freiburg im Breisgau 1949, there column 4144, article "Syringes".
- ^ Brockhaus ABC Chemie , VEB FA Brockhaus Verlag Leipzig 1965, p. 1323.
- ↑ Hans-Dieter Jakubke, Ruth Karcher (coordinators): Lexicon of Chemistry in three volumes, Spektrum Verlag, Heidelberg, Volume 3, 1999, ISBN 3-8274-0381-2 , p. 260.