期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 14, 页码 7241-7252出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.06.044
关键词
Thermal conductivity; FEM; Representative volume elements; MgO; CaZrO3
资金
- CYTED network HOREF [312RT0453]
- EMaDeS-Energy, Materials and Sustainable Development [Centro-01-0145-FEDER-000017]
- Portugal 2020 Program (PT 2020), within the Regional Operational Program of the Center (CENTRO 2020)
- European Union through the Eu-ropean Regional Development Fund (ERDF)
- Portuguese Foundation for Science and Technology (FCT) , European Social Found [UID/EMS/00151/2020, UID/FIS/04650/2020, SFRH/BPD/117838/2016]
- Spain: Project CSIC [PIE 201660E097]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/117838/2016] Funding Source: FCT
This study investigated the thermal conductivity of composite materials with different CaZrO3/MgO fractions and single-phase materials. Experimental and finite element modeling results showed that FEM is sensitive to temperature variation and provides statistically coincident results with experiments.
Three composite materials with different CaZrO3/MgO fractions (2/3, 1/2, 1/3) and two single-phase materials (CaZrO3 and MgO) were fabricated and their thermal conductivity was investigated. Complete thermal and mechanical characterizations (thermal expansion coefficient, thermal diffusivity, specific heat, hardness and toughness) of the materials were performed. Values of the thermal conductivity up to 480 degrees C of the composites were compared with those calculated with the main analytical models. From the real microstructures of the three composites, representative volume elements (RVE) were built and used for finite element modelling (FEM) of thermal conductivity using conductivities of the single-phase materials as inputs. The FEM results showed no differences for the 3 spatial directions of the RVE, nor for the different edge lengths (11, 14 and 17 mu m). Results of all analytical models are statistically different from the experimental ones, being those from the Bruggeman model the closest. Results of the proposed FEM are statistically coincident with the experimental ones, showing sensitivity to temperature variation.
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