Title

Mechanical Behaviour of Carbon Fibre Reinforced TaC/SiC and ZrC/SiC Composites Up to 2100°C

Abstract

The microstructure and elevated temperature mechanical properties of continuous carbon fibre reinforced ZrC and TaC composites were investigated. Silicon carbide was added to both compositions to aid sintering during hot pressing. Fibres were homogeneously distributed and no fibre degradation was observed at the interface with the ceramic matrix even after testing at 2100 °C. The flexural strength increased from 260 to 300 MPa at room temperature to ~450 MPa at 1500 °C, which was attributed to stress relaxation. At 1800 °C, the strength decreased to ~410 MPa for both samples. At 2100 °C plastic deformation resulted in lower strength at the proportional limit (210—320 MPa), but relatively high ultimate strength (370—440 MPa). The sample containing ZrC had a lower ultimate strength, but higher failure strain at 2100 °C due to the weak fibre/matrix interface that resulted in fibre-dominated composite behaviour.

Department(s)

Materials Science and Engineering

Comments

This work has received funding from the JECS Trust program and from the European Union’s Horizon 2020 “Research and innovation programme” under grant agreement N° 685594 (C 3 HARME)

Keywords and Phrases

Ceramic-Matrix Composites (CMCs); Fibre-matrix interface; High temperature mechanical properties; Tantalum carbide; Ultra-High-Temperature-Ceramics (UHTCs); Zirconium carbide

International Standard Serial Number (ISSN)

0955-2219

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Elsevier Ltd, All rights reserved.

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