Laser powder bed fusion device
A miniaturized laser powder bed fusion device was developed to perform operando X-ray diffraction and imaging experiments at the Swiss Light Source. The device exhibits the basic functionalities of a commercial SLM device.
A collimated infrared laser beam is deflected by a 2-axis scanning unit into the main chamber. The laser beam is focused onto a 12 × 12 mm2 build stage that can be translated vertically with a travel range of 12 mm and sub-micron step size. The build stage can be heated using a silicon-nitride resistive heater. Powder recoating is based on a hopper feeding system. The powder reservoir can be moved across the baseplate with the aid of a motor-spindle assembly. The device is completely closed, preventing laser light or particles to escape. The chamber is continuously flushed with high purity argon gas. With the aid of manual flowmeters, a slight overpressure is created in the chamber to avoid oxygen contamination by the outside atmosphere. The whole setup (laser, scanning unit and printing chamber) is cooled down with a closed-loop air-water exchange based chiller. The video below describes the basic principle behind operando X-ray diffraction during SLM.
|Type||redPOWER® continuous wave Fiber Laser|
|Spot size||25 µm - 250 µm|
|Dimensions||15mm x 20mm x 30mm|
|Build plate||12mm x 12mm|
|Maximum build height||8mm|
|Maximum angle tilt stage||20°|