Time-lapse of "laser powder bed fusion" or (PBF-LB)
>These stainless-steel beads form a powder that is over six times finer than flour, meaning each individual particle is too small to see with the naked eye. Powders like this are the basic building material of a type of metal 3D printing called "laser powder bed fusion" or (PBF-LB).
It works by spreading out a thin layer of metal powder and using a powerful laser to melt the powder together into a specific shape. Then the process continues by laying down a fresh layer of powder on top and repeating.
Each layer is leveled off by a wiper. It’s like the way you might level off a cup of flour with the back of a knife.
To make a good 3D-printed part, it's important that the powder is spread in an even, consistent way. Now, thanks to NIST research, we can watch the powder spreading and study its behavior. This work will improve the consistency and quality of metal 3D printed parts.
Source: NIST