Volume 104, Issue 11 p. 5467-5478
RESEARCH ARTICLE

Properties of SiC-Si made via binder jet 3D printing of SiC powder, carbon addition, and silicon melt infiltration

Corson L. Cramer

Corresponding Author

Corson L. Cramer

Manufacuting Science Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

Correspondence

Corson L. Cramer, Manufacuting Science Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.

Email: [email protected]

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Amy M. Elliott

Amy M. Elliott

Manufacuting Science Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

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Edgar Lara-Curzio

Edgar Lara-Curzio

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

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Alexis Flores-Betancourt

Alexis Flores-Betancourt

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

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Michael J. Lance

Michael J. Lance

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

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Lu Han

Lu Han

Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

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Jesse Blacker

Jesse Blacker

The ExOne Company, North Huntingdon, PA, USA

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Artem A. Trofimov

Artem A. Trofimov

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

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Hsin Wang

Hsin Wang

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

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Ercan Cakmak

Ercan Cakmak

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

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Kashif Nawaz

Kashif Nawaz

Buildings and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

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First published: 24 May 2021
Citations: 18

Abstract

We report the physical and mechanical properties of ceramic composite materials fabricated by binder jet 3D printing (BJ3DP) with silicon carbide (SiC) powders, followed by phenolic resin infiltration and pyrolysis (IP) to generate carbon, and a final reactive silicon melt infiltration step. After two phenolic resin infiltration and pyrolysis cycles; porosity was less than 2%, Young's modulus was close to 300 GPa, and the flexural strength was 517.6 ± 24.8 MPa. However, diminishing returns were obtained after more than two phenolic resin infiltration and pyrolysis cycles as surface pores in carbon were closed upon the formation of SiC, resulting in reaction choking and residual-free carbon and porosity. The instantaneous coefficient of thermal expansion of the composite was found to be independent of the number of phenolic IP cycles and had values of between 4.2 and 5.0 ppm/°C between 300 and 1000℃, whereas the thermal conductivity was found to have a weak dependence on the number of phenolic IP cycles. While the manufacturing procedures described here yielded highly dense, gas impermeable, siliconized SiC composites with properties comparable to those of bulk siliconized silicon carbide processed according to conventional techniques, BJ3DP enables the manufacture of objects with complex shape, unlike conventional techniques.