Long-term corrosion tests of Ti3SiC2 and Ti2AlC in oxygen containing LBE at temperatures up to 700 °C

Two MAX-phase materials, Ti3SiC and Ti2AlC, were tested at 550 °C, 650 °C and 700 °C up to 10 000 h in LBE (lead-bismuth-eutectic) containing of 10−6 and 10−8 wt% oxygen. It was found that secondary phases have a strong influence on corrosion effects. Ti3SiC showed a surface disintegration at 550°C/...

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Bibliographic Details
Published in:Journal of nuclear materials 2016-12, Vol.482, p.114-123
Main Authors: Heinzel, A., Weisenburger, A., Müller, G.
Format: Article
Language:English
Subjects:
Aluminum oxide
Bismuth inclusions
Corrosion
Corrosion effects
Corrosion tests
Disintegration
Dissolution
Exposure
High temperature physics
Lead
Oxidation
Oxygen
Silicon dioxide
Studies
Titanium dioxide
Titanium oxide powders
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Summary:Two MAX-phase materials, Ti3SiC and Ti2AlC, were tested at 550 °C, 650 °C and 700 °C up to 10 000 h in LBE (lead-bismuth-eutectic) containing of 10−6 and 10−8 wt% oxygen. It was found that secondary phases have a strong influence on corrosion effects. Ti3SiC showed a surface disintegration at 550°C/10−6 wt% oxygen after longer exposure, while a 4–7 μm thick TiO2 layer with Pb-Bi inclusions was detected on Ti2AlC. However, Ti3SiC is protected by a double layered oxide with an outer part of TiO2 and a mixed inner layer of SiO2 and TiO2 at the higher temperatures. Ti2AlC formed a TiO2 surface layer containing Al2O3. Some defects could be observed on the Ti3SiC surface in LBE containing 10−8 wt% oxygen at 550 °C and 650 °C. The secondary phases between the Ti3SiC grains showed strong oxidation at 700 °C. Due to the high Al solubility in LBE, Ti2AlC experienced strong dissolution attack after longer exposure times at 650 and 700 °C.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2016.10.007