期刊
COMPOSITES PART B-ENGINEERING
卷 90, 期 -, 页码 287-301出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2015.12.014
关键词
Ceramic-matrix composites (CMCs); Thermal properties; Micro-mechanics; Powder processing
资金
- National Science Foundation [CMMI-1030836]
- Air Force Office of Scientific Research AFOSR [FA 9550-10-1-0002]
This study examines the thermal properties, i.e. thermal expansion, specific heat, and thermal conductivity, of active composites comprising of barium titanate (BaTiO3) and silver (Ag). BaTiO3/Ag composites with varying silver composition were fabricated by powder metallurgy technique. The coefficient of thermal expansion (CTE) was measured within -50 to 250 degrees C temperature range using thermal mechanical analyzer (TMA). Differential scanning calorimeter (DSC) was used to measure the specific heat of the composites at a constant pressure within -50 to 200 degrees C temperature range, while, thermal conductivity and thermal diffusivity were measured by HotDislc technique. The effect of silver content on various thermal properties was investigated experimentally and numerically. The experimental results were also compared with some available experimental data from literature. As for the numerical investigations, 2-D and 3-D micromechanical models were constructed from realistic and randomly generated microstructures in order to predict the effective CTE and thermal conductivity of the composite, and investigate the local field fluctuations. The micromechanical models were implemented in finite elements. The effects of loading direction, porosity, particle shape and dispersion, and material properties of constituents were also studied. Numerical results for 2-D micromechanical models and 3-D generated microstructural models were compared to the experimental data. (C) 2016 Elsevier Ltd. All rights reserved.
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