Thermal and mechanical properties of zirconia/monazite-type LaPO 4 nanocomposites fabricated by pecs

Seung Ho Kim, Tohru Sekino, Takafumi Kusunose, Ari T. Hirvonen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Thermal barrier coatings (TBC's) perform the important function of insulating components such as gas turbine parts that operate at elevated temperatures. The most commonly applied TBC material is yttria stabilized zirconia (3YSZ), because it has a coefficient of thermal expansion similar to that of substrate metals. In this study, 3YSZ/monazite-type LaPO4 nanocomposites were prepared by the pulse electric current sintering (PECS) method. The amount of LaPO4 added to 3YSZ was varied from 0 to 40 vol.% and thermal and mechanical properties of these nanocomposites were investigated. The XRD results of the 3YSZ/LaPO4 nanocomposites demonstrated differences in the crystalline phase of as-sintered and annealed zirconia. The phase transformation of as-sintered specimens was related to the amount of monazite-type LaPO4, but this phenomenon was not observed in annealed specimens. The density of 3YSZ/LaPO4 nanocomposites after annealing was decreased and the porosity was increased. Also, mechanical properties of 3YSZ/LaPO4 nanocomposites decreased with increasing dispersion of monazite-type LaPO4 particles. It was caused by low mechanical properties of LaPO4 and weak bonding between 3YSZ. Thermal conductivity of 3YSZ/LaPO4 nanocomposites was lower than 3YSZ. The difference of thermal conductivity between 3YSZ and 3YSZ/LaPO4 nanocomposites at high temperatures was higher than that at low temperatures.

Original languageEnglish
Title of host publicationAdvanced Ceramic Coatings and Interfaces II - A Collection of Papers Presented at the 31st International Conference on Advanced Ceramics and Composites
Number of pages8
Publication statusPublished - 2008 Aug 22
Event31st International Conference on Advanced Ceramics and Composites - Daytona Beach, FL, United States
Duration: 2007 Jan 212007 Jan 26

Publication series

NameCeramic Engineering and Science Proceedings
ISSN (Print)0196-6219


Other31st International Conference on Advanced Ceramics and Composites
Country/TerritoryUnited States
CityDaytona Beach, FL

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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