New molten metal hybrid filters will make components even safer and more resistant in the future

molten metal.
Scientists of the TU Bergakademie Freiberg have developed a new process for the production of molten metal hybrid filters in the Collaborative Research Centre 920.

The technology, which was patented at the end of February 2020, is suitable for removing various impurities and non-metallic inclusions from molten metal and making components cast from it safer and more resistant. The new process is particularly important for foundry and the metalworking industry.

During the production process of metallic casting materials, there are many different impurities in the melt, which are difficult or impossible to remove metallurgically. It is known that the size, type and distribution of such non-metallic inclusions significantly influence the mechanical properties of the metals. One way to remove these inclusions from the molten metal is to use intelligent ceramic filter materials or filter systems. The inclusions are retained on the filter surface or are deposited inside the filter.

In order to increase filtration efficiency (up to now less than 90 percent for inclusion particles in the size range 1 to 100 µm) and perspectively also to remove inclusions with different chemical compositions from molten metal, the materials scientists at TU Bergakademie Freiberg have developed a new hybrid filter system. The patented process (patent 10 2018 201 577) consists of at least two ceramic filter materials with different coatings. Thus, the molten metal is filtered more efficiently. This makes the melt purer and increases the quality and resistance of cast components. This reduces scrap rates on the part of users and processors and also opens up new possibilities for recycling metals.  

The Collaborative Research Centre 920

In the Collaborative Research Centre 920 "Multifunctional filters for molten metal filtration - a contribution to Zero Defect Materials", scientists at TU Bergakademie Freiberg are developing novel intelligent filter materials and filter systems as well as novel model-supported filter designs for purer molten metals. Thus, the SFB 920 makes an important contribution to the development of highly stressable, functional and adaptive mechanical components for safety and lightweight constructions.

Further Information:

SFB 920:

Prof. Christos Aneziris, Phone: +49-3731-39-2505; Dr.-Ing. Undine Fischer, Phone: +49-3731-39-3324
Diagram of the cross-section of a ceramic molten metal
Computer tomographic image of a molten metal hybrid filter
Light microscope image of an active filtration layer