Abstract
The thermal diffusivity of plasma-sprayed zirconium oxide-7% yttrium oxide and aluminium oxide-3% titanium oxide ceramic coatings was measured by using a periodic heat-flow method. Samples were prepared with different porosities thus allowing the thermal diffusivity as function of porosity to be determined. The samples were also impregnated with silicone oil so that the effect on the thermal diffusivity by replacing air with silicone oil in the pores could be determined. The experimental results were compared with effective medium theories representing three different microstructures: (1) a continuous ceramic matrix with dispersed pores, (2) a continuous ceramic matrix with continuously interconnected pores, (3) dispersed ceramic particles loosely bonded together. The latter two microstructures gave the best agreement between the experimental data and the theory.
Similar content being viewed by others
References
J. H. Zaat, Ann. Rev. Mater. Sci. 13 (1983) 9.
R. H. Palmer, in “Proceedings of the 13th International Thermal Spraying Conference”, edited by C. C. Berndt (ASM, Materials Park, Ohio, 1992) p. 825.
A. Bjorneklett, L. M. Nilsen, H. Kristiansen and T. Storfossene, ibid.”, p. 829.
T. Peterman, ibid.”, p. 309.
R. Mcpherson, Thin Solid Films 112 (1984) 89.
J. Gerard-Hirne and Y. Lazennec, Trans. Int. Ceram. Congr. 10 (1967) 413.
H. C. Fiedler, Mater. Res. Soc. Symp. Proc. 30 (1984) 173.
R. Mcpherson and B. V. Shafer, Thin Solid Films 97 (1982) 201.
J. C. Maxwell, “A Treatise on Electricity and Magnetism”, 3rd Edn (Dover, New York, 1954) Ch. 9.
J. Garnet, Phil. Trans. R. Soc. Lond. 203 (1904) 385.
Idem, ibid., 205 (1906) 237.
D. Bruggeman, Ann. Phys. 24 (1935) 636.
D. S. McLachlan, J. Phys. C Solid State Phys. 20 (1987) 865.
R. E. Newham, D. P. Skinner and L. E. Cross, Mater. Res. Bull. 13 (1978) 525.
A. Bjorneklett, L. Halbo and H. Kristiansen, Int. J. Adhesion Adhesives 12 (1992) 99.
P. N. Sen, C. Scala and M. H. Cohen, Geophys. 46 (1981) 781.
A. J. Ångström, Ann. Phys. Chem. 64 (1861) 33.
B. Sundqvist, Int. J. Thermophys. 12 (1991) 191.
D. R. Lide, “CRC Handbook of Chemistry and Physics”, 73rd Edn (CRC Boca Raton, Fl, 1992).
L. Pawlowski, C. Martin and P. Fauchais, in “Proceedings of the 10th International Thermal Spraying Conference” (Deutscher Verlag Fur Schweisstechnik (DVS) GmbH, Dusseldorf, 1983) p. 31.
H. Nakahira, K. Tani, K. Miyajima and Y. Harada, in “Proceedings of the 13th Int. Thermal Spraying Conference”, edited by C. C. Berndt (ASM, Materials Park, Ohio, 1992) p. 1011.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bjorneklett, A., Haukeland, L., Wigren, J. et al. Effective medium theory and the thermal conductivity of plasma-sprayed ceramic coatings. JOURNAL OF MATERIALS SCIENCE 29, 4043–4050 (1994). https://doi.org/10.1007/BF00355967
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00355967