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French scientists productive in 3D printing tremendous higher-resolution optical glass


Researchers from the ICMCB-CNRS laboratory and the College of Bordeaux have made a system of 3D printing certification phosphate glass by using FDM technologies.

By initially pulling the glass filament making use of a fiber drawing tower, the scientists ended up capable to extrude sophisticated geometries though retaining the photoluminescence houses of the substance. The workforce believes its immediate approach to fabricating the clear glass presents rise to the probability of reducing-edge optical factors and new biomedical units.

Printing the phosphate glass. Image via University of Bordeaux.
Printing the phosphate glass. Graphic by way of the University of Bordeaux.

Phosphate glass

Phosphate glass is an example of optical glass, a materials with refractive houses that makes it perfect for lenses, optical fibers, and other parts in optical techniques. The 3D printing certification of these material has largely eluded researchers for several a long time because of to unwanted opacity changes and certain crystallization phenomena.

In accordance to the researchers, any semi-prosperous tries in the earlier have been held back again by their unfortunate absence of resolution or density. The means to additively manufacture a high density, sub-millimeter resolution glass object would empower a entire host of reduced-price tag geometrically intricate photonic equipment – the top purpose of the Bordeaux review.

Extruding the glass filament

The initial stage of the review concerned acquiring the base phosphate glass filament. The substance was specially formulated in a platinum crucible at 800°C prior to staying drawn into a 1.9mm thick rod. Due to the unusually higher temperatures required to melt and extrude the phosphate glass, the group experienced to package out an entry-stage Prusa i3 clone with a custom made very hot conclude and print mattress. With some large modifications, the printer could inevitably take care of the 470°C nozzle and 320°C bed temperatures essential to make the experiment get the job done.

By investigating a quantity of print parameters in the study, the group was profitable in attaining an incredibly superior density of 99.98% and avoided undesirable gentle scattering in the portion. A total systematic microstructural characterization was executed with SEM imagery and X-ray tomography, revealing layer thicknesses in the location of 100 microns and line widths of about 600 microns. The crew also observed a correlation between inter-line bonding top quality and gentle transmission.

The printed structures displayed very low porosities of about 0.02%. Image via University of Bordeaux.
The printed buildings exhibited extremely minimal porosities of about .02%. Picture by means of the University of Bordeaux.

Perhaps the most noteworthy final result in the analyze was the reality that the printed glass structures maintained their optical luminescence houses, that means they shown homogenous gentle transmission in the course of. This residence is completely vital in any higher-tech optical process, so the work shows great opportunity in supplying a expense-successful process of finish-use part manufacturing.

The filament and printed parts displayed homogenous light distribution throughout. Image via University of Bordeaux.
The filament and printed areas displayed homogenous gentle distribution in the course of. Image by means of the College of Bordeaux.

More information of the analyze can be found in the paper titled ‘Direct 3D-printing of phosphate glass by fused deposition modeling’. It is co-authored by Reda Mohammed Zaki, Clément Strutynski, Simon Kaser, et al.

Whilst they have viewed terrific results with their results, the Bordeaux scientists are not the to start with to experiment with 3D printed glass. Scientists at ETH Zürich in Switzerland have formerly 3D printed glass objects using a specialised resin and DLP 3D printing certification engineering. The technique utilizes a photopolymerization-induced section separation inside the hybrid resin, generating sophisticated glass areas from a plastic and natural mix.

Elsewhere, in Canada, researchers made a 3D printable glass acceptable for laser and infrared optics apps. The materials has a reasonably lower melting temperature of about 330°C, which means it can be extruded by a modified entry-stage desktop 3D printer.

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Showcased graphic demonstrates 3D printed phosphate glass. Image by means of the University of Bordeaux.