Glass from a 3-D printer

Glass from a 3-D printer
Various glass objects created with a 3-D printer. Credit: Group for Complex Materials / ETH Zurich

ETH researchers used a 3-D printing process to produce complex and highly porous glass objects. The basis for this is a special resin that can be cured with UV light.

Producing objects using 3-D printing is not easy. Only a few groups of researchers around the world have attempted to produce glass using additive methods. Some have made objects by printing , but the disadvantage is that this requires extremely high temperatures and heat-resistant equipment. Others have used powdered ceramic particles that can be printed at room temperature and then sintered later to create glass; however, objects produced in this way are not very complex.

Researchers from ETH Zurich have now used a new technique to produce complex glass objects with 3-D printing. The method is based on stereolithography, one of the first 3-D printing techniques developed during the 1980s. David Moore, Lorenzo Barbera, and Kunal Masania in the Complex Materials group led by ETH processor André Studart have developed a special resin that contains a plastic, and organic molecules to which glass precursors are bonded. The researchers reported their results in the latest issue of the journal Natural Materials.

Credit: ETH Zurich

Light used to "grow" objects

The resin can be processed using commercially available Digital Light Processing technology. This involves irradiating the resin with UV patterns. Wherever the light strikes the resin, it hardens because the light sensitive components of the polymer resin cross link at the exposed points. The plastic monomers combine to form a labyrinth-like structure, creating the polymer. The ceramic-bearing molecules fill the interstices of this labyrinth.

An object can thus be built up layer by layer. The researchers can change various parameters in each layer, including : Weak light intensity results in large pores; intense illumination produces small pores. "We discovered that by accident, but we can use this to directly influence the pore size of the printed object," says Masania.

The researchers are also able to modify the microstructure, layer by layer, by mixing silica with borate or phosphate and adding it to the . Complex objects can be made from different types of glass, or even combined in the same using the technique.

The researchers then fire the blank produced in this way at two different temperatures: at 600˚C to burn off the polymer framework and then at around 1000˚C to densify the ceramic structure into glass. During the firing process, the objects shrink significantly, but become transparent and hard like window glass.

Glass from a 3-D printer
The blank (left) is fired at 600 degrees to eliminate the plastic framework. In a second firing step, the object becomes glass (right). Credit: Group for Complex Materials / ETH Zurich

Patent application submitted

These 3-D-printed glass objects are still no bigger than a die. Large glass objects, such as bottles, drinking glasses or window panes, cannot be produced in this way—which was not actually the goal of the project, says Masania.

The aim was rather to prove the feasibility of producing of complex geometry using a 3-D printing process. However, the new technology is not just a gimmick. The researchers applied for a patent and are currently negotiating with a major Swiss glassware dealer who wants to use the technology in his company.


Explore further

3-D printing glass objects

More information: David G. Moore et al. Three-dimensional printing of multicomponent glasses using phase-separating resins, Nature Materials (2019). DOI: 10.1038/s41563-019-0525-y
Journal information: Nature Materials

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Citation: Glass from a 3-D printer (2019, November 26) retrieved 11 December 2019 from https://phys.org/news/2019-11-glass-d-printer.html
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