The technology called SLEDM increases the production efficiency of fuel cell components by 20 times

Selective LED melting (SLEDM)-a targeted melting of metal powder using high-power LED light sources, this new 3D metal printing technology is led by Franz Haas, director of the Institute of Production Engineering at TU Graz Development, has applied for a patent.

This technology is similar to selective laser melting (SLM) and electron beam melting (EBM), where metal powder is melted by laser or electron beam, and then assembled into a component layer by layer. However, SLEDM solves these two central problems based on the powder bed manufacturing process: time-consuming production of large-volume metal parts and time-consuming subsequent manual processing steps.

Reduce production time

Unlike the SLM or EBM process, the SLEDM process uses a high-power LED beam to melt metal powder. The light-emitting diodes used for this purpose were specially modified by Styrian lighting expert Preworks in the west and equipped with a complex lens system, through which the diameter of the LED focusing during the melting process can easily be between 0.05 mm and 20 mm Change between. This allows a larger volume of material to be melted in a unit of time without having to dispense with the internal microstructure, thereby reducing the production time of fuel cells or medical technology components by an average of 20 times.

Cumbersome rework is no longer necessary

This technology is combined with a newly designed production plant. Unlike other metal smelting plants, this plant adds this ingredient from top to bottom. Therefore, the component is exposed, the amount of powder required is reduced to a minimum, and the necessary post-processing can be carried out simultaneously during the printing process. "Time-consuming, usually manual rework, which is necessary in current methods. For example, grinding rough surfaces and removing support structures, these steps are no longer necessary and can save more valuable time, "Haas said.

Application areas and further plans

A key application area for this technology is sustainable transportation, which is the production of bipolar plates for fuel cells or components of battery systems. Haas said: "We hope to make SLEDM technology economically applicable to electrified vehicles and make SLEDM enter this research area as soon as possible," he will produce a marketable prototype of this 3D metal printer-codenamed "made by TU Graz".

(Original source: Fuel Cell Engineering China New Energy Network Comprehensive)

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