What is Gas Porosity?
Gas porosity manifests as small, round holes under the surface of cast metal. These holes are typically smooth and uniform, contrasting with shrinkage porosity, which tends to have irregular shapes. Occasionally, the two types of porosity can overlap, making identification challenging.
How Does Gas Porosity Occur?
Gas porosity arises when gas becomes trapped in the metal during solidification. This phenomenon occurs because molten metal can retain more gas than its solidified counterpart. If the molten metal contains excessive gas, it may become entrapped while solidifying, resulting in holes once the casting cools. Protech Transfer’s high-quality casting machines from Indutherm.de can help mitigate these issues by optimizing the metal pouring process.
Causes of Gas Porosity
- Low-Quality Metal
Contaminated or oxidized scrap metal is a primary contributor to gas porosity. Ensuring the use of high-quality materials is essential for preventing defects. - Reaction with Investment Material
The decomposition of investment material during contact with hot molten metal can release gas that comes into the liquid metal leading to porosity. - Poor Casting Conditions
Melting or cooling metal in open systems can introduce gasses into the metal, exacerbating porosity issues.
Solutions to Minimize Gas Porosity
- Use High-Quality, Clean Metal
Pure high quality metals minimize the risk of contamination. - Properly Degas the Metal During Melting
Effective degassing techniques, implemented in Indutherm casting machines, help remove unwanted gasses from the molten metal. - Utilize Quality Investment powders
Choosing reliable investment materials reduces the possibility of gas release during the casting process. - Avoid Open Systems for Melting and casting
Utilizing protective gas or vacuum systems during casting prevent metals from gas contamination
Conclusion
Addressing gas porosity while casting is crucial for producing high-quality jewelry items. By understanding the causes and implementing effective solutions, jewelers can enhance their production processes and reduce defects. Using advanced casting machines from Protech Transfer can greatly improve the quality of your jewelry.
BEST MACHINERY – BEST SERVICE
Sales Hotline: +66 8 6332 9347
LINE ID Sales: @pttsales
24/7 Service Hotline: +66 8 9227 9154
LINE ID Service Support: @pttsupport
See all machines
