C/C‐SiC component for metallic phase change materials

Abstract

Thanks to their high energy density and thermal conductivity, metallic Phase Change Materials (mPCM) have shown great potential to improve the performance of thermal energy storage systems. However, the commercial application of mPCM is still limited due to their corrosion behavior with conventional container materials. This work first addresses on a fundamental level, whether carbon‐based composite‐ceramics are suitable for corrosion critical components in a thermal storage system. The compatibility between the mPCM AlSi12 and the Liquid Silicon Infiltration (LSI)‐based carbon fiber reinforced silicon carbide (C/C‐SiC) composite is then investigated via contact angle measurements, microstructure analysis, and mechanical testing after exposure. The results reveal that the C/C‐SiC composite maintains its mechanical properties and microstructure after exposure in the strongly corrosive mPCM. Based on these results, efforts were made to design and manufacture a container out of C/C‐SiC for the housing of mPCM in vehicle application. The stability of the component filled with mPCM was proven nondestructively via computer tomography (CT). Successful thermal input‐ and output as well as thermal storage ability were demonstrated using a system calorimeter under conditions similar to the application. The investigated C/C‐SiC composite has significant application potential as a structural material for thermal energy storage systems with mPCM.

Experimental evaluation and theoretical prediction of elastic properties and failure of C/C‐SiC composite

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Due to its excellent mechanical properties, favorable damage tolerance and comparatively low density, continuous carbon fiber reinforced carbon silicon carbide (C/C-SiC) composite fabricated by Liquid Silicon Infiltration (LSI) process has been successfully used in aerospace, energy, and transport technology. [1][2][3][4][5][6][7][8] The preliminary investigation of siliconization in German Aerospace Center Stuttgart started in the late 1980s and the manufacturing process of LSI-based C/C-SiC was developed in the beginning of 2000s. 9 Since then, material properties of the composite have been characterized intensively.

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In situ X-ray tomography characterisation of 3D deformation of C/C-SiC composites loaded under tension

“…The principal vectors are tensile and mostly along the through-thickness direction, which indicate delamination-like deformation. To obtain a statistical representation of the principal orientations of the strains, their densities of orientations are calculated using the MTEX toolbox 5 and are expressed in stereographic projection as shown in Figure 9.c and d. The 2D projection coordinate system and the corresponding 3D spherical coordinate system used in the present study are defined in Appendix A. The two specimens exhibit similar distributions of the densities of orientations, confirming the 3D visualisation of Figure 9.a and b, i.e.…”

“…Because of its favourable fracture toughness, comparatively low density and resistance against severe environments (temperature, corrosive atmospheres, etc. ), carbon fibre reinforced silicon carbide (C/C-SiC), such as developed via Liquid Silicon Infiltration (LSI) at the Institute of Structures and Design of German Aerospace Centre (DLR), has potential applications in areas including aerospace, traffic and energy technology [1][2][3][4][5]. Some macroscopic mechanical properties of C/C-SiC material have been studied previously, including the tensile and bending strength in varying loading directions [6] and the damage mechanisms with different fibre architectures through a modal acoustic emission (AE) technique [7].…”

Manufacture and thermomechanical characterization of wet filament wound C/C‐SiC composites

“…[1][2][3][4][5][6][7] Due to excellent corrosion and thermal shock resistance, C/C-SiC as a promising candidate can also be applied in thermal storage applications. [8][9] In short-term application, C-fiber-based composites, such as carbon-silicon carbide composites (C/C-SiC) developed by DLR using the well-known LSI process, are superior to other CMC materials due to their ease of manufacture, variability of raw materials, and cost. Thus, there is a huge potential for future rocket propulsion applications.…”