Precisely Magnetized: Iron filings stick to this mini chessboard with four millimeter edge length. The partially magnetic structure was produces from a single type of steel power at different temperatures. Image: Empa
Precisely Magnetized: Iron filings stick to this mini chessboard with four millimeter edge length. The partially magnetic structure was produces from a single type of steel power at different temperatures. Image: Empa - During metal processing in the 3D laser printer, temperatures of more than 2,500 degrees Celsius are reached within milliseconds, causing some components of the alloys to evaporate. While widely considered a problem inherent to the process, Empa researchers spotted an opportunity - and are now using the effect to create new alloys with novel properties and embed them in 3D-printed metallic work pieces with micrometer precision. It looks quite inconspicuous to the casual beholder, hardly like groundbreaking innovation: a small metallic chessboard, four millimeters long on either side. At first glance, it shines like polished steel; at second glance, minute differences in color are visible: The tiny chessboard has 16 squares, eight appear slightly darker, the other eight a bit lighter. The unassuming material sample goes to show that 3D printing with the help of laser beams and metal pow-der is not only suitable for creating new geometric shapes, but also for producing new materials with completely new functionalities.
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