The rapid development of modern miniaturized, portable, foldable electronic devices significantly raises the threshold for thermal management materials. Anisotropic thermal conductive materials are urgently required, which can dissipate redundant heat in the specific direction without affecting surrounding components. A critical challenge is to develop a suitable method for large-scale manufacturing highly anisotropic thermal conductive materials. Here, we proposed a new simple, efficient and low-cost mechanical rolling method for large-scale preparation of thermal anisotropic metal materials under conventional conditions. The bimetallic combination Ag/Al with comparative ductility and hardness was selected for repeated folding and calendering at room temperature. The maximum thermal anisotropic ratio of the metal plates reached up to 52.8. Interestingly, it was found that the addition of BN nanosheets can further enhance the thermal anisotropic ratio as large as three times. Our study provides a new simple idea for the synthesis of thermal anisotropic materials, which advances the development of thermal management materials powerfully.

现代小型化，便携式，可折叠电子设备的迅速发展，大大提高了热管理材料的门槛。迫切需要各向异性的导热材料，它们可以在特定方向上散发多余的热量，而又不会影响周围的组件。一个关键的挑战是开发一种适合大规模生产高度各向异性的导热材料的方法。在此，我们提出了一种在常规条件下大规模制备热各向异性金属材料的简单，高效，低成本的新型机械轧制方法。选择具有比较高的延展性和硬度的双金属组合Ag / Al，以便在室温下重复折叠和压延。金属板的最大热各向异性比达到52.8。有趣的是，发现添加BN纳米片可以进一步将热各向异性比率提高至三倍。我们的研究为热各向异性材料的合成提供了一个新的简单思路，有力地推动了热管理材料的发展。