Experimental Study on Heat Transfer and Anti-Corrosion Performance of an Aln Porous Ceramic Skeleton with Controllable Preparation

Abstract

Porous skeleton plays positive role in improving heat storage and release efficiency of molten salt phase change materials(PCM), and the preparation of porous skeleton has become the hot spot. However, in the current study, the simple structure of porous skeleton limits its application in complex heat storage devices. In this study, the heat transfer performance of solar salt was improved using photocuring 3D printing technology to prepare an aluminum nitride (ALN) porous ceramic skeleton. Firstly, the solar salt/ALN porous ceramic skeleton composite PCM was prepared. Then, the heat storage efficiency of the composite PCM was investigated. The experiment results showed that the heat storage efficiency can be increased by 33.04% for the composite PCM compared to the pure solar salt, and the maximum temperature difference can be reduced by up to 22.1 °C. After 180 heat cycles, the performance of the composite PCM remains stable and no new substance is formed according to X-ray diffraction (XRD) and Raman spectroscopy. This study is of great significance for improving the heat storage efficiency of the complex structure heat storage device and provides a foundation for the application of ceramic 3D printing technology in the field of the energy storage and heat transfer.

Keywords: Porous ceramic, Photocuring 3D printing, Solar salt, heat transfer, Anti-corrosion