TY - JOUR
T1 - Thermal properties of Sm2Zr2O7-NiCr 2O4 composites
AU - Li, T.
AU - Ma, Z.
AU - Liu, L.
AU - Zhu, S. Z.
PY - 2014
Y1 - 2014
N2 - Rare-earth zirconate is one of the most promising candidate materials for the next generation thermal barrier coatings. However, at high temperatures the thermal conductivity of the rare-earth zirconate increases because of radiation. NiCr2O4, which can absorb the infrared photons intensely, was introduced to reduce the radiative thermal conductivity of Sm 2Zr2O7. NiCr2O4 and Sm2Zr2O7 powders were prepared by coprecipitation method. The bulks of Sm2Zr2O7-x vol% NiCr2O4 (x=0, 5, 10, 15 and 20) composites were prepared by non-pressure sintering. The phase, microstructure and composition of the samples were characterized. The absorptivity and the thermal conductivity of the composites were also tested. The absorptivity of the composites was enhanced as increasing the content of NiCr2O4. The total thermal conductivities of the composites were higher than that of pure Sm 2Zr2O7, but the recovery of the thermal conductivity of rare-earth zirconate was relived or disappeared in the testing temperature range.
AB - Rare-earth zirconate is one of the most promising candidate materials for the next generation thermal barrier coatings. However, at high temperatures the thermal conductivity of the rare-earth zirconate increases because of radiation. NiCr2O4, which can absorb the infrared photons intensely, was introduced to reduce the radiative thermal conductivity of Sm 2Zr2O7. NiCr2O4 and Sm2Zr2O7 powders were prepared by coprecipitation method. The bulks of Sm2Zr2O7-x vol% NiCr2O4 (x=0, 5, 10, 15 and 20) composites were prepared by non-pressure sintering. The phase, microstructure and composition of the samples were characterized. The absorptivity and the thermal conductivity of the composites were also tested. The absorptivity of the composites was enhanced as increasing the content of NiCr2O4. The total thermal conductivities of the composites were higher than that of pure Sm 2Zr2O7, but the recovery of the thermal conductivity of rare-earth zirconate was relived or disappeared in the testing temperature range.
KW - Absorptivity
KW - High temperature
KW - Thermal conductivity
UR - http://www.scopus.com/inward/record.url?scp=84900499404&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2014.03.093
DO - 10.1016/j.ceramint.2014.03.093
M3 - Article
AN - SCOPUS:84900499404
SN - 0272-8842
VL - 40
SP - 11423
EP - 11426
JO - Ceramics International
JF - Ceramics International
IS - 7 PART B
ER -