Researchers have printed medical devices at supersonic speed

Cornell University researchers have developed 3D printing technology that allows

create cellular metallic materials by mixing powder particles at supersonic speed.

This technology is called "cold spraying"it can produce strong and porous structures that are 40% stronger than similar materials made using conventional manufacturing processes. The small size and porosity of the structures make them suitable for the creation of biomedical components.

We focused on creating structures thatcan be applied in the field of thermoregulation, energy absorption and biomedicine. Instead of using only heat as an input or driving force for adhesion, we now use plastic deformation to adhere the powder particles.

The researchers wanted to improve the existingtechnology and get rid of production problems. The most important of these is that to print metallic materials, they must be heated at high temperatures above their melting point. This can lead to the accumulation of residual stresses, deformation and unwanted phase transformations.

To eliminate these problems, scientists have developedmethod using a compressed gas nozzle for firing titanium alloy particles. The diameter of the particles ranged from 45 to 106 microns (microns is a millionth of a meter), and the speed of their movement was about 600 m / s, which exceeds the speed of sound. In the future, direct delivery of energy through a nozzle at a speed of the order of 10 m / s will make the method sixty times faster.

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