Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 38, Issue 12, Pages 4268-4275Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.04.053
Keywords
Thermal barrier coatings (TBC); Self - repairing materials; Mechanical properties; Ceramic composites; Life time extension
Categories
Funding
- European Union Seventh Framework Programme (FP7) [309849]
- European Research Council [695638]
- EPSRC [EP/P025021/1] Funding Source: UKRI
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Yttria - partially stabilised zirconia (YPSZ) MoSi2 composites have been designed to prolong the lifetime of the matrix by self - healing cracks during thermal cycling. The healing reaction at high temperatures is based on the decomposition of MoSi2, leading to a volumetrically expanding reaction product, which seals the crack. In this work, coefficient of thermal expansion (CTE) and the fracture toughness of composites containing MoSi2 particles, produced by spark plasma sintering (SPS) have been compared to conventional YPSZ. The CTE mismatch between YPSZ and MoSi2 was found to be small, implying that thermally induced mismatch stresses will be small and the composites have a similar CTE to conventional YPSZ. Fracture toughness was found not to be affected by the particles and showed similar values to unreinforced YPSZ. Cracks introduced by indentation have been shown neither to prefer, or avoid, the particles suggesting that such a composite system is capable of autonomously activating the self - healing reaction.
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