Fabrication and Optical Properties of Sm₂Zr₂O₇-NiCr₂O₄

Abstract:

Sm₂Zr₂O₇ is one of the promising candidate materials for the next generation thermal barrier coatings because of its excellent thermal properties. But at high temperature the thermal conductivity of rare-earth zirconate increases because of radiation conduction. NiCr₂O₄, which can absorb the infrared photons intensely, was introduced to reduce the radiation conduction of rare-earth zirconate. NiCr₂O₄ powder was prepared by coprecipitation. The bulks of Sm₂Zr₂O₇— NiCr₂O₄ with different content of NiCr2O4 were prepared by using non-pressure sintering. The phase and microstructure of the samples were characterized by XRD and SEM. The optical absorption was also investigated. The absorptivity of the composite, which was generally higher than that of pure Sm₂Zr₂O₇ prepared by coprecipitation and non-pressure sintering, was enhanced with the content of NiCr₂O₄ increasing. The enhancement of absorptivity will reduce the radiation conduction of rare-earth zirconate potentially.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 459-462
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.459
• Online since: June 2012
• Authors: Tao Li, L. Liu, Q. Xu, S.Z. Zhu
• Keywords: Optical Property, Sm₂Zr₂O₇-NiCr₂O₄, Thermal Barrier Coating (TBC)

References

[1] N.P. Padture, M. Gell, E. Jordan, Thermal barrier coatings for gas-turbine engine applications, Science. 296 (2002) 280-284.

DOI: 10.1126/science.1068609

[2] D. M Zhu, J. A. Nesbitt, R. A. Miller, Furnace cyclic behavior of plasma-sprayed zirconia-yttria and multi-component rare earth oxide doped thermal barrier coatings, Ceramic Engineering and Science Proceedings. 23 (2002) 533-545.

DOI: 10.1002/9780470294758.ch59

[3] D. M Zhu, R. A. Miller, Thermal conductivity and sintering behavior of advanced thermal barrier coatings, Ceramic Engineering and Science Proceedings. 23 (2002) 457-468.

DOI: 10.1002/9780470294758.ch51

[4] Q. Xu, W. Pan, H. Z. Mao, Research progress of Ln2Zr2O7 with pyrochlore structure, Rare Metal Materials and Engineering. 34 (2005) 1100-1104.

[5] G.Lim, A. Kar, Modeling of thermal barrier coating temperature due to transmissive radiative heating, J. Mater. Sci. 44 (2009) 3589-3599.

DOI: 10.1007/s10853-009-3486-8

[6] J. M Tian, W. R. Zhu , H. D. Li, Infrared radiant emissivities of ceramics with spinel structure, International Journal of Infrared and Millimeter Waves. 14 (1993) 1855-1863.

DOI: 10.1007/bf02101337