Journal
CERAMICS INTERNATIONAL
Volume 41, Issue 4, Pages 5247-5256Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.11.039
Keywords
Porosity; Mechanical properties; Nanoindentation; Thermal barrier coating
Categories
Funding
- Department of Science and Technology (DST), New Delhi [SR/S2/HEP-0024/2008]
- Council of Scientific and Industrial Research (CSIR), New Delhi [09/81 (1170)/12-EMR-I]
- Indian Space Research Organisation (ISRO)
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In the present study, the detailed evaluation of nanomechanical properties in terms of hardness and Young's modulus of duplex and compositionally graded YSZ based thermal barrier coating (TBC) have been evaluated by nanoindentation technique. Duplex and compositionally graded TBCs have been fabricated by thermal spray deposition technique. As TBCs are commonly applied for high temperature protection, effect of isothermal treatment in air (at 900 degrees C and 1000 degrees C) on nanomechanical properties has also been evaluated. Finally, the mechanical properties have been correlated with characteristics of the coating. The hardness and Young's modulus of the TBCs are found to increase with increased duration of thermal exposure. Modulus of resilience and resistance to plastic deformation of the duplex and compositionally graded TBC have also been evaluated at room temperature and with thermal exposure and discussed in detail. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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