Effects of W on high-temperature antioxidative properties of Nb/Nb5Si3 composite

DOI

10.2991/amcce-17.2017.190How to use a DOI?

Keywords

Spark plasma sintering; In-situ synthesis; Oxidation behaviour; Nb/Nb5Si3 composites

Abstract

The multi-component Nb-Si system in-situ composites with composition of Nb-20Si-5Al-15Ti-xW (at. %) were prepared by Spark Plasma Sintering (SPS) technology. The high temperature oxidation behavior and microstructure of the alloy were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron probe microscopy (EPMA). The results show that the microstructure of the composite consists of (Nb, Ti, W)ss, -Nb5Si3, -Nb5Si3 and (Nb, Ti, W)5Si3 phase. With an increase of W addition, the oxidation resistance of the composites at 800°C decrease firstly and then increase. At 1100°C the addition of W decreased the oxidation resistance during the first 40h, then changed to increase the oxidation resistance. Pest oxidation behavior was exhibited by the Nb-20Si-5Al-15Ti-xW. The oxidation resistance of the composite at 1100°C is better than at 800°C because the oxide scale is more compact structure.

Copyright

© 2017, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - WenYuan Long
AU  - Weiguo Liu
AU  - Xuan Liu
PY  - 2017/03
DA  - 2017/03
TI  - Effects of W on high-temperature antioxidative properties of Nb/Nb5Si3 composite
BT  - Proceedings of the 2017 2nd International Conference on Automation, Mechanical Control and Computational Engineering (AMCCE 2017)
PB  - Atlantis Press
SP  - 1062
EP  - 1066
SN  - 2352-5401
UR  - https://doi.org/10.2991/amcce-17.2017.190
DO  - 10.2991/amcce-17.2017.190
ID  - Long2017/03
ER  -