Robocasting of reaction bonded silicon carbide structures

Larissa Wahl, Mylena Lorenz, Jonas Biggemann, Nahum Travitzky

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A novel shaping method for the fabrication of reaction bonded silicon carbide structures was investigated in this work. A paste consisting of silicon carbide as inert filler and carbon powder was developed and printed by robocasting technology. Layer by layer deposition of the ceramic paste facilitates the printing of complex shaped structures. Different structures such as lattices, hollow cylinders, bending bars and gyroids were printed using nozzles with diameter of 0.5 mm and 1.5 mm. After pyrolysis at 700 °C and further heat treatment at 1850 °C the samples were infiltrated using the liquid silicon infiltration technique to obtain dense near-net shape RBSC structures. The robocasted structures showed a hardness of approximately 20 GPa, a thermal conductivity of ∼112 W/m*K, Young's modulus of ∼356 GPa, flexural strength of ∼224 MPa and an amount of residual silicon of approximately 23%. These measured properties are comparable with those of traditionally fabricated RBSC.

Original languageEnglish
Pages (from-to)4520-4526
Number of pages7
JournalJournal of the European Ceramic Society
Volume39
Issue number15
DOIs
Publication statusPublished - 1 Dec 2019

Keywords

  • Additive manufacturing
  • Liquid silicon infiltration
  • Near-net shaping
  • Reaction bonded silicon carbide
  • Robocasting

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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