Look for intense collaborative research efforts over the next 10 years to improve additive manufacturing technologies for use in high-tech aerospace applications. The cost of aerospace components is boosted dramatically due to the amount of material beyond the finished geometry that must be removed during manufacturing-often 90 percent or more, according to Chris English, an engineer with GE Aviation. As a result there is increased interest in the potential to use additive manufacturing technologies that were originally developed for rapid prototyping applications.
One example is a project at the George W. Woodruff School of Mechanical Engineering at the Georgia Institute of Technology. Researchers there are looking at the potential to produce net shape low-density cellular metal structures from layer-based additive manufacturing of metal-oxide ceramic slurry followed by post-processing in a reducing atmosphere. A ceramic suspension would be direct printed in a research investigation. Many issues remain, however, with existing additive manufacturing systems including materials available, poor surface finish, difficulties in removing support systems, and inability to make large parts.