3D printing of dense and porous TiO2 structures

• Direct foam writing allows the fabrication of highly porous and hierarchical ceramic structures with high specific mechanical properties. This manufacturing technique, however, has mainly used stabilized Al2O3 foam inks. In this work, we pressent a novel foam ink based on TiO2. This ink uses polyvinyl alcohol (PVA) as a binder and a small amount of zinc as a frothing agent. We used this ink to produce cylindrical foam samples via direct foam writing. The foams had a porosity of up to 65% and a mean pore size of 180 μm, which is significantly larger than previously reported for direct foam writing with Al2O3. The foams were tested in compression and were found to have an elastic modulus of 0.5 GPa and a compressive strength of 12–18 MPa. These mechanical properties are similar to those of porous ceramics produced by conventional manufacturing routes. Therefore, this work represents a step forward by broadening the direct foam writing process to a wider range of porous ceramics.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

Nyckelord

Additive manufacturing

Direct foam writing

Foam

Robocasting ceramics

Titanium dioxide (TiO2)

Alumina

Aluminum oxide

Ceramics industry

Compressive strength

Foams

Pore size

Titanium dioxide

Ceramic structure

Conventional manufacturing

Frothing agents

Manufacturing techniques

Poly (vinyl alcohol) (PVA)

Robocasting

Titanium dioxides (TiO2)

Writing process

3D printers

Publikations- och innehållstyp

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