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To meet the requirements of both high thermal conductivity and substantial latent heat storage and release in spacecraft thermal management materials, this study employs a hot-pressing technique to fabricate a multidimensional carbon-based, thermally enhanced microencapsulated phase change composite. This approach addresses the limitations of conventional phase change materials, which exhibit low thermal conductivity and a propensity for liquid leakage. By integrating experimental assessments with finite element numerical simulations, we systematically investigated the effects of varying contents and ratios of microencapsulated phase change materials, flake graphite, and pitch-based carbon fibers on the composite’s thermal properties, specifically thermal conductivity and latent heat. Furthermore, the formation mechanism of the internal multidimensional thermal conduction network was elucidated.
The results indicate that introducing multidimensional thermally conductive materials into the microencapsulated phase change system, coupled with the optimization of component composition and structure, can establish a continuous and dense multidimensional carbon-based conduction network. Leveraging the synergistic effects of these conductive materials and employing a multi-size flake graphite filling strategy significantly enhanced the overall thermal conductivity of the composite, reaching 1.021 W·m-1·K-1, while maintaining a high latent heat of 81.540 J·g-1. These findings provide theoretical and practical guidance for the optimization and application of advanced thermal management materials in spacecrafts.-
Keywords:
- spacecraft thermal management /
- microcapsule phase change composite materials /
- multidimensional carbon-based network /
- synergistic thermal enhancement
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