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http://technical-articles.hooverandstrong.com/wordpress/porosity-the-jewelers-nightmare/
Jun 01, 1999 · Shrinkage Porosity If the ring is thick at top, the metal can cool first at the bottom, trapping molten metal above it (shown in deepest red). As the trapped metal cools, it suffers shrinkage porosity, which normally would have occurred at the button. Detecting Porosity Porosity can appear anywhere on jewelry. In this case, it’s on the side ...
https://www.callagold.com/problem-solving/re-tipped-prongs-porosity-rings/
Metals -- particularly those used in jewelry -- tend to bond very readily with oxygen. Argon, however, is a very non-reactive gas and will not bond with the metal being cast. While some small amount of oxygen may still remain in the chamber, the vacuum sealed machines are quite efficient, and porosity is rarely a problem during the casting process.
https://www.romanoff.com/help-info/how-to/casting/porosity-the-facts.html
What Causes Porosity: The Facts. BY: BOB ROMANOFF. The causes of porosity today are still shrinkage and gas, just as they were when I wrote my first article on porosity in 1976. However, most of the porosity that we see in jewelry castings today is shrinkage porosity, which results from the metal contracting during freezing and solidification.
https://orchid.ganoksin.com/t/casting-porosity/1562
Handmade 18K, 22K, and platinum gemstone jewelry. Diamond setting, rubber/metal molds, casting, lapidary Die and mold engraving, plastic patterns for casting. Jewelry design, cad/cam, milling, scroll, filigree, & more. ... Is the porosity from metal loss (sucking) or loose investment getting incorporated into the metal? Have you cut some porous ...Estimated Reading Time: 5 mins
https://en.mimi.hu/jewelry/porosity.html
Porosity Areas of the mold that absorbed some of the casting material leaving the cast object with a rough, granular surface. ~-A metal defect that appears as pits or holes in the surface. Precious metals-Metals valued in jewelry, specifically gold, platinum, and silver.
http://technical-articles.hooverandstrong.com/wordpress/improving-your-silver-casting/
Shrinkage porosity is the most common defect in jewelry castings, and no other single factor can affect porosity as much as sprue size and placement. Shrinkage porosity occurs when the supply of molten met- al is choke off from a section of the casting that has not completely solidified.
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 …
https://orchid.ganoksin.com/t/porosity-in-castings/60262
May 12, 2020 · Hello all I recently set up a casting studio after a long hiatus from making jewelry. I was given a Victor Oxy acetelyne torch with a standard pointed tip for melting metal, mostly silver. I am getting a lot of porosity in my castings. The last time I can the pieces looked almost like filigree. I used silver with a deox alloy. I believe that the problems are being caused by the acetelyne torch ...
https://www.gsjewelrymfg.com/2017/03/18/metal-shrinkage-the-whys-and-hows-of-metal-shrink/
Mar 18, 2017 · Though it is more costly than standard sterling, the attributes for reduced shrinkage, reduced porosity and tarnish resistance can outweigh the added cost. Let us work with you and your design team to show you how to design around shrinkage issues in your jewelry. G&S Jewelry Mfg is a small woman-owned business located in Albuquerque, NM.
https://www.ganoksin.com/article/sprue-system-design/
The Sprue System Design. by Eddie Bell. A very high percentage of investment casting defects can be directly or indirectly attributed to the design of the sprue system feeding metal to the pattern. Defects such as incomplete pattern filling and shrinkage porosity are easily identified as …
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