TY - JOUR
T1 - Thermal conductivity of nanoporous ZrO2-4 mol% Y2O3 multilayer coatings fabricated by EB-PVD
AU - Jang, Byung Koog
N1 - Funding Information:
This work was carried out with financial support from NEDO (New Energy and Industrial Technology Development Organization), Japan. The author would like to thank Dr C. A. J. Fisher of University of Bath for helpful discussions.
PY - 2008/1/15
Y1 - 2008/1/15
N2 - The effect of multilayer configurations on the thermal conductivity of 4 mol% Y2O3- stabilized ZrO2 coatings fabricated by EB-PVD has been investigated. The deposited coating layers consist of columnar grains containing nano-sized pores. Multilayer specimens are found to contain many pores at the interfaces between layers. The density and thermal conductivity of the multilayer coatings decreases with increasing number of coating layers for one to six layers. The thermal conductivities of coatings deposited onto rotating substrates are lower than those of coatings deposited on stationary substrates. The decreased thermal conductivity of multilayer coatings is ascribed to the increased total porosity resulting from an increase in the number of interface pores concomitant with the formation of non-uniform interfaces between layers, which causes increased phonon scattering.
AB - The effect of multilayer configurations on the thermal conductivity of 4 mol% Y2O3- stabilized ZrO2 coatings fabricated by EB-PVD has been investigated. The deposited coating layers consist of columnar grains containing nano-sized pores. Multilayer specimens are found to contain many pores at the interfaces between layers. The density and thermal conductivity of the multilayer coatings decreases with increasing number of coating layers for one to six layers. The thermal conductivities of coatings deposited onto rotating substrates are lower than those of coatings deposited on stationary substrates. The decreased thermal conductivity of multilayer coatings is ascribed to the increased total porosity resulting from an increase in the number of interface pores concomitant with the formation of non-uniform interfaces between layers, which causes increased phonon scattering.
UR - http://www.scopus.com/inward/record.url?scp=37049004028&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=37049004028&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2007.07.017
DO - 10.1016/j.surfcoat.2007.07.017
M3 - Article
AN - SCOPUS:37049004028
SN - 0257-8972
VL - 202
SP - 1568
EP - 1573
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
IS - 8
ER -