Additive micro-manufacturing of crack-free PDCs by two-photon polymerization of a single, low-shrinkage preceramic resin

Konstantinou, Georgia; Kakkava, Eirini; Hagelüken, Lorenz; Sasikumar, P.; Wang, Jieping; Makowska, Małgorzata; Blugan, Gurdial; Nianias, Nikolaos; Marone, Federica; Swygenhoven, H. Van; Brugger, Jürgen; Moser, Christophe

doi:10.1016/j.addma.2020.101343

Cited by 32 publications

(19 citation statements)

References 33 publications

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“…233 Another strategy to reduce volumetric shrinkage is to increase the network density of the polymer such that the difference in density between the polymer and the desired ceramic is reduced. 122,135,234 For example, Park et al formulated an AHPSbased photoresin system that could undergo both photo-and thermal crosslinking processes, and showed that the formation of a dense polymer network using this dual curing approach resulted in a linear shrinkage of only 3% (Fig. 7(C)).…”

Section: In Situ Materials Synthesis To Advance Materials Developmentmentioning

confidence: 99%

Three‐dimensional chemical reactors: in situ materials synthesis to advance vat photopolymerization

Yee

Greer

2021

Polymer International

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Vat photopolymerization (VP) is one of the most remarkable additive manufacturing techniques today and has been used for a variety of applications, from materials research to product manufacturing. The main challenge with VP is the limited choice of compatible materials, which motivates significant interest in VP materials development. We provide a brief overview of the materials that are currently accessible via VP and highlight recent advances in the field. We also provide perspective on expanding the library of materials compatible with VP using in situ materials synthesis.

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Section: In Situ Materials Synthesis To Advance Materials Developmentmentioning

confidence: 99%

Three‐dimensional chemical reactors: in situ materials synthesis to advance vat photopolymerization

Yee

Greer

2021

Polymer International

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“…The green body is converted to the polymer derived ceramic through the pyrolytic transformation. The SPR-684 is a commercially available polysiloxane which converts to ceramic for pyrolysis temperatures tested already in the range of 1000-1400 • C [6,15,29,49]. Here, both green and ceramic parts were examined by X-ray photoelectron spectroscopy (XPS).…”

Section: Ceramization Of the Polysiloxane Substituted Precursormentioning

confidence: 99%

“…In Figure 4a, the two fitted peaks in the green state correspond to Si-R and Si-O-Si (from the siloxane backbone unit) [40,50] from the cross-linked preceramic gels. In the XPS spectra of pyrolysed state, a major peak at 103.21 eV appears representing Si-O bonds from amorphous SiO2 units resulting from the polymer to ceramic conversion [15,29,40,49]. In Figure 4b, the elemental composition of the green and the ceramic state is presented.…”

Section: Ceramization Of the Polysiloxane Substituted Precursormentioning

confidence: 99%

“…PDCs with micrometer resolution were first demonstrated using two-photon lithography (2PL) by [27] and later more complex structures were also reported with the Nanoscribe 3D printer using higher pyrolysis temperatures [28]. A low-shrinkage preceramic resin (∼ 30 %) was also cured using the Nanoscribe system and resulted in fully dense and crack-free 2PL-PDCs in [29]. Multiscale ceramic parts were demonstrated by combining DLP and 2PL, for which micrometer resolution was obtained via the latter on the centimeter scale object fabricated by the former [30].…”

Section: Introductionmentioning

confidence: 99%

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Tomographic Volumetric Additive Manufacturing of Silicon Oxycarbide Ceramics

Kollep¹,

Konstantinou²,

Madrid‐Wolff³

et al. 2021

Preprint

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Ceramics are highly technical materials with properties of interest for multiple industries. Precisely because of their high chemical, thermal, and mechanical resistance, ceramics are difficult to mold into complex shapes. A possibility to make convoluted ceramic parts is to use preceramic polymers (PCP) in liquid form. The PCP resin is first solidified in a desired geometry and then transformed into ceramic compounds through a pyrolysis step that preserves the shape. Lightbased additive manufacturing (AM) is a promising route to achieve solidification of the PCP resin. Different approaches, such as stereolithography, have already been proposed but they all rely on a layer-by-layer printing process which sets limitations on the printing speed and object geometry. Here, we report on the fabrication of complex 3D centimeter-scale ceramic parts by using tomographic volumetric printing which is fast, high resolution and offers a lot of freedom in terms of geometrical design compared to state-of-the-art AM techniques. First, we formulated a photosensitive preceramic resin that was solidified by projecting light patterns from multiple angles. Then, the obtained 3D printed parts were converted into ceramics by pyrolyzing them in a furnace. We demonstrate the strength of this approach through the fabrication of dense microcomponents exhibiting overhangs and hollow geometries without the need of supporting structures, and characterize their resistance to high heat and harsh chemical treatments.

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“…The use of liquid precursors allows for manufacturing of micron-scale ceramic components with high precision by micromolding [ 12 , 13 ] or lithography based techniques [14][15][16] . Recently, it was shown that two-photon polymerization (TPP) can be applied for the manufacturing of PDCs with complex geometries and sub-micron level precision [17][18][19][20] . Such advanced manufacturing technologies could be used to produce microparts for microelectromechanical systems (MEMS).…”

Section: Introductionmentioning

confidence: 99%

Cracks, Porosity and Microstructure of Ti Modified Polymer-Derived Sioc Revealed by Absorption-, XRD- and XRF-Contrast 2D and 3D Imaging

et al. 2020

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Morphology, phase composition, cracks and porosity are investigated in monolithic Ti modified SiOC polymer-derived ceramics pyrolyzed at 10 0 0 °C and 140 0 °C using synchrotron X-ray full field absorptioncontrast tomographic microscopy and scanning XRF-and XRD-contrast microscopy. Samples pyrolyzed at 10 0 0 °C show a crack-free structure, but pyrolysis at 1400 °C results in formation of cracks and at higher Ti content also shows porosity. Tomography revealed the formation of a layered morphology that varies in terms of crystallographic structure and/or Ti stoichiometric concentration. The microstructural observations and electrical conductivity are discussed in terms of pyrolysis temperature and Ti content.

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Additive micro-manufacturing of crack-free PDCs by two-photon polymerization of a single, low-shrinkage preceramic resin

Cited by 32 publications

References 33 publications

Three‐dimensional chemical reactors: in situ materials synthesis to advance vat photopolymerization

Three‐dimensional chemical reactors: in situ materials synthesis to advance vat photopolymerization

Tomographic Volumetric Additive Manufacturing of Silicon Oxycarbide Ceramics

Cracks, Porosity and Microstructure of Ti Modified Polymer-Derived Sioc Revealed by Absorption-, XRD- and XRF-Contrast 2D and 3D Imaging

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