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<p>For the manufacturing of the wick of a vapor chamber, although the Selective Laser Melting (SLM) technology offers the freedom to design structures and gradients, it is limited by the laser spot diameter, making it difficult to precisely control the micropore diameters. This study adopts a novel modeling strategy, which controls the pore characteristics by adjusting the relative relationship between the unit length and the wall thickness of cubic structural units to achieve the best balance between capillary force and permeability. By characterizing the pore characteristics and capillary suction performance (capillary force and permeability) of the printed samples, a predictive model of the relationship between the geometric parameters of the unit and the structural performance was established. The research found that the quantitative relationship between the unit length to the wall thickness determines the pore diameter and porosity of the porous structure, which in turn has a critical impact on the fluid transport performance of the wick. This study demonstrates the feasibility of using the SLM process to prepare high-performance customized wicks, has quantified the relationship between the structural unit size parameters and functional performance for the first time, and provides a reference for the structural optimization design and precise manufacturing of the wick of a vapor chamber.</p>

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Exploring the relationship between unit cell parameters and porous copper structures and properties via modeling and 3D printing experiments

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Zhijian Wang,
  • Mingrui Zhang,
  • Songwei Wang,
  • Guangyu Li,
  • Hongwu Song,
  • Leonid Vassiliev

摘要

For the manufacturing of the wick of a vapor chamber, although the Selective Laser Melting (SLM) technology offers the freedom to design structures and gradients, it is limited by the laser spot diameter, making it difficult to precisely control the micropore diameters. This study adopts a novel modeling strategy, which controls the pore characteristics by adjusting the relative relationship between the unit length and the wall thickness of cubic structural units to achieve the best balance between capillary force and permeability. By characterizing the pore characteristics and capillary suction performance (capillary force and permeability) of the printed samples, a predictive model of the relationship between the geometric parameters of the unit and the structural performance was established. The research found that the quantitative relationship between the unit length to the wall thickness determines the pore diameter and porosity of the porous structure, which in turn has a critical impact on the fluid transport performance of the wick. This study demonstrates the feasibility of using the SLM process to prepare high-performance customized wicks, has quantified the relationship between the structural unit size parameters and functional performance for the first time, and provides a reference for the structural optimization design and precise manufacturing of the wick of a vapor chamber.