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research article

Tomographic microscopy of functionally graded polymer-derived SiCN ceramics with tunable gradients

Hageluken, Lorenz
•
Makowska, Malgorzata Grazyna
•
Marone, Federica
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January 31, 2024
Materialia

Polymer-derived ceramics (PDCs) are a very attractive class of materials due to their excellent properties such as resistance to high temperatures and harsh environments, adjustability of mechanical and functional behavior, and compatibility with a broad range of shaping techniques. The liquid nature of the siliconcontaining polymeric precursors and the composition tuning via addition of fillers set the stage for the creation of functionally graded ceramics (FGCs). Polysilazane-based precursors with and without divinylbenzene (DVB) addition for carbon concentration increase are sequentially cast in three different custom molds. DVB concentration, casting order, and thermal processing conditions are varied to study their influence on the interface nature and composition gradient of the functionally graded ceramic parts which are obtained after pyrolysis at 1000-1400 C. Synchrotron -based tomographic microscopy was applied for high -resolution 3D visualization of the parts, allowing clear distinction of the dissimilar regions and approximate quantification of the composition gradients tunable from submicrometer to millimeter transition lengths. Achieving spatially defined electrical conductivity contrasts in monolithic silicon carbonitride parts, an LED attached onto a FGC plate outlines a promising use case for harsh environment applications.

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Type
research article
DOI
10.1016/j.mtla.2024.102025
Web of Science ID

WOS:001177367900001

Author(s)
Hageluken, Lorenz
•
Makowska, Malgorzata Grazyna
•
Marone, Federica
•
Brugger, Juergen  
Date Issued

2024-01-31

Publisher

Elsevier Sci Ltd

Published in
Materialia
Volume

33

Article Number

102025

Subjects

Technology

•

Polymer-Derived Ceramics

•

Functionally Graded Materials

•

Functionally Graded Ceramics

•

Molding

•

Tomographic Microscopy

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMIS1  
FunderGrant Number

ETH domain, Switzerland, through the Strategic Focus Area (SFA) - Advanced Manufacturing program

Available on Infoscience
March 18, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/206580
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