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https://www.callagold.com/problem-solving/re-tipped-prongs-porosity-rings/
Jul 11, 2016 · Porosity in Cast Gold Ring. While the small dimples on the surface of a jewelry piece can look ugly, the real danger of porosity comes from the structural …Reviews: 24
http://technical-articles.hooverandstrong.com/wordpress/porosity-the-jewelers-nightmare/
Jun 01, 1999 · Shrinkage Porosity Shrinkage porosity generally occurs in the thicker portions of cast jewelry. When it’s visible on the surface, it often looks like starbursts or irregular cracks. Gas Porosity Gas porosity can be scattered throughout a piece of jewelry, making it brittle and prone to breaking. It often appears as blotches in highly polished areas.
https://link.springer.com/article/10.1007/BF03214692
Porosity is one of the important causes for the rejection of jewellery items cast by the lost wax process. If it is of the shrinkage type, then there is a considerable reservoir of knowledge, arising from experience in the casting of dental gold and other gold alloys, which can be drawn upon to overcome the problem. If it is gas porosity, however, the caster is faced with the fact that there ...Cited by: 11
https://www.romanoff.com/help-info/how-to/casting/porosity-the-facts.html
The most common causes of shrinkage porosity can be found in the design of the jewelry piece itself — primarily in very abrupt changes from heavy sections to thin sections, or vice-versa. It can also occur when the sprues that are used are too small and insufficient to keep the hot molten metal feeding the area of the ring which is cooling and shrinking.
https://orchid.ganoksin.com/t/casting-porosity/1562
years, I have been getting “shrinkage” porosity in some of my castings. The only thing I can attribute it to is the silicon copper alloys that I have been using. It seems that when I cast with “old” customers gold, I dont have any problems- but when I use new or 50% new gold, I get porosity. outlined below are the procedures that I follow :Estimated Reading Time: 5 mins
https://goldriverjewellers.wordpress.com/2011/05/04/porosity-in-cast-jewellery/
May 04, 2011 · Porosity that occurs in cast jewellery weakens the structure of the piece which causes breaks and cracking. Porosity can look like visible pits on the surface of a highly polished area and result from errors during the casting process. There is no remedy to this problem and the ring must be remade. A handmade piece on the other hand can avoid the visible pits as the piece isn’t cast.Estimated Reading Time: 50 secs
https://www.ipc.org/sites/default/files/test_methods_docs/2.3.24.pdf
mine the porosity of gold plating on both copper and nickel surfaces by chemical means. This method may also be used to test rhodium or palladium. 2 Applicable Documents None 3 Test Specimens 3.1 Any test, pre-production, or production sample of gold-plated circuitry 4 Apparatus 4.1 Whatman No. 542 filter paper 4.2 Glass lab trays
https://orchid.ganoksin.com/t/fixing-porosity/11475
porosity.Macro are large pits or can be tears in the metal or the dreaded spongy looking stuff that can take up much of the casting.Macro porosity can be fixed in some instances by removing the section of the ring and replacing it with a new section of gold.Micro porosity …Estimated Reading Time: 4 mins
https://www.briangavindiamonds.com/news/what-causes-the-tiny-pits-in-my-ring/
Porosity is caused by tiny gas bubbles escaping the mold during the casting process. Tiny pits in the surface of jewelry, is usually a matter of porosity. This is not something that you can prevent, since it occurred during the casting process.
https://www.finishing.com/406/18.shtml
Porosity in gold is normally not a problem as long as the barrier layer (usually nickel) is thick enough and the proper gold and gold thickness is applied. Pulse plating for gold offers lower porosity than the conventional plating method, something I would consider for your application. Good Luck! Mark Baker.
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