Preparation of form-stable carbonates/magnesium oxide-flake graphite composite thermal storage material and its thermal conductivity |
| |
| Authors: | SANG Lixia XU Yongwang LI Feng ZHANG Yating MA Wentong CHEN Xu WANG Hao |
| |
| Affiliation: | Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education, Key Laboratory of Heat Transfer and Energy Conservation Beijing Municipality, Department of Energy Science and Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China |
| |
| Abstract: | The medium-and high-temperature composite heat storage materials were fabricated by the mixed sintering method using mixed carbonates as phase change materials, magnesium oxide as ceramic matrix material, and graphite flakes as heat transfer enhancer. Based on the characterizations of XRD and SEM, the resultant composite materials have shown enhanced chemical stability, as well as more pore structures due to the presence of graphite flakes. By analyzing the thermal properties of the composite materials with different contents of graphite flakes, it can be found that the melting points of the composite materials remain unchanged and their thermal conductivities increase continuously with the increase of the content of graphite flakes. When the content of graphite flakes is up to 25%, the thermal conductivity of the composite material reaches 3.88 W/(m·K) and 2.52 W/(m·K) at 250℃ and 560℃, respectively. The enhancement mechanism of thermal conductivity of the composite materials is further discussed from the view of the microstructure and interface layer theories. |
| |
| Keywords: | composite materials molten salt graphite flakes thermal properties thermal conductivity |
|
| 点击此处可从《》浏览原始摘要信息 |
|
点击此处可从《》下载全文 |
|
