A local aluminum foundry was experiencing issues with impurities in their aluminum castings and needed a quick, completely packaged solution to improve the quality of their finished product.
When aluminum is cast, impurities known as inclusions can create weak points in the product. One of the most prevalent causes of these impurities is the presence of hydrogen in the molten aluminum due to atmospheric humidity, combustion in gas furnaces, condensation on tools, fluxes, and alloy additives.
Installed by C.H. Reed, the nitrogen generation system featured a nano NRC Cycling Refrigerated Air Dryer and a nano N2plus Series Nitrogen Generator.
Hydrogen gas is soluble in liquid aluminum and can pass through it almost as easily as it passes through air. As the liquid metal cools and becomes hard, the hydrogen flows from areas of high pressure to areas of low pressure, which creates pockets of gas. When the metal solidifies, those pockets become inclusions and weak spots in the castings.
Along with the nitrogen generator, C.H. Reed implemented compressed air treatment, including pre-filters from nano Purification Solutions.
The demand for higher quality aluminum products is progressively on the rise, especially in cutting edge industries like aerospace. Degassing is a process used to remove the hydrogen from the molten aluminum. The most popular degassing method involves introducing nitrogen gas into the liquid aluminum. The hydrogen causing these inclusions is simply drawn to the nitrogen bubbles, then carried up through to the surface and released, thus eliminating the hydrogen gas pockets causing the impurities.
C.H. Reed installed Transair aluminum compressed air piping to connect the nitrogen generator.
To effectively supply high-purity nitrogen into this foundry’s process and fulfill the needs of their application, C.H. Reed installed a nano N2plus Series Nitrogen Generator piped together with Transair aluminum compressed air piping. The system also included a nano NRC Cycling Refrigerated Air Dryer, along with two F-Series coalescing pre-filters and an F-Series general purpose buffer vessel filter.
Overall, this foundry will experience a rapid return on investment (typically less than 24 months), increased reliability, a reduced carbon footprint, and increased worker safety—all while eliminating the impurities in their finished product.
For more information, visit www.chreed.com.