Biomachining: Using Bacteria to Machine Metal
2025-01-28
Biomachining is a novel machining process employing lithotrophic bacteria, such as Thiobacillus ferrooxidans and Thiobacillus thiooxidans, to remove material from metal parts. These bacteria utilize the chemical energy from iron or copper oxidation to remove material from a metal surface when immersed in a culture fluid. Unlike traditional chemical or physical machining, biomachining offers a low material removal rate and a superior surface finish, making it ideal for micromachining. This process has been successfully used on pure iron and copper, and involves masking the areas not to be machined, similar to chemical milling. The process's depth is influenced by factors like stirring rate and temperature.