Fabrication and characterisation of single-phase Hf2Al4C5 ceramics
Author(s)
Type
Journal Article
Abstract
Single-phase Hf2Al4C5 ternary carbide was fabricated from Hf/Al/C powder mixtures by pressure assisted sintering techniques such as hot pressing and spark plasma sintering at 1900 °C for 3 h and 10 min, respectively. XRD confirmed that the ternary carbide started to form at temperatures as low as 1500 °C and with total formation of Hf2Al4C5 after reactive sintering for 1 h at 1900 °C. It is evident from HRTEM that two Hf-C layers were sandwiched with 4 Al-C layers (Al4C3) in the Hf2Al4C5 ternary carbide. Tight interlocking of grains, faceted grains and stacking faults were occasionally observed. Thermal conductivity of Hf2Al4C5 is measured to be 14 w m−1k−1 from room temperature to 1300 °C. The oxidation studies carried out at 1300 °C for 3 h reveal that the oxidation layer thickness is around 220 μm and it contains microcracks closer to sample surface whereas the interface looks seamless without any cracking or spallation of the oxide layer.
Date Issued
2021-12-12
Date Acceptance
2021-12-12
Citation
Journal of the European Ceramic Society, 2021, 42 (4), pp.1292-1301
ISSN
0955-2219
Publisher
Elsevier BV
Start Page
1292
End Page
1301
Journal / Book Title
Journal of the European Ceramic Society
Volume
42
Issue
4
Copyright Statement
9/© 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.
Identifier
https://www.sciencedirect.com/science/article/pii/S0955221921009298?via%3Dihub
Subjects
Materials
0912 Materials Engineering
Publication Status
Published