Achieving high performances of high thermal conductivity and low thermal expansion remains a great challenge. In this study,we have designed and synthesized the ScF_(3)@Cu core-shell composites through a general elect...Achieving high performances of high thermal conductivity and low thermal expansion remains a great challenge. In this study,we have designed and synthesized the ScF_(3)@Cu core-shell composites through a general electroless plating method to coat Cu on the surface of negative thermal expansion particles of ScF_(3). A spatially continuous copper network structure is formed in the present core-shell structure composites to achieve high thermal conductivity and low thermal expansion simultaneously, which is different from the conventional mixed composites. Notably, a high thermal conductivity(136.3 W m^(-1) K^(-1)) has been achieved in the ScF_(3)@Cu-40 core-shell composite with a low thermal expansion property(4.3×10^(-6) K^(-1)). The mechanism of thermal property and microstructure of the present core-shell composites are systematically studied based on different models. Our proposed approach in this study can be widely applicable to numerous advanced materials, which should simultaneously control thermal conductivity and thermal expansion properties.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.21825102,12004032 and 22001014)the Fundamental Research Funds for the Central Universities,China(Grant Nos.FRF-TP-18-001C2 and FRF-MP-20-40)。
文摘Achieving high performances of high thermal conductivity and low thermal expansion remains a great challenge. In this study,we have designed and synthesized the ScF_(3)@Cu core-shell composites through a general electroless plating method to coat Cu on the surface of negative thermal expansion particles of ScF_(3). A spatially continuous copper network structure is formed in the present core-shell structure composites to achieve high thermal conductivity and low thermal expansion simultaneously, which is different from the conventional mixed composites. Notably, a high thermal conductivity(136.3 W m^(-1) K^(-1)) has been achieved in the ScF_(3)@Cu-40 core-shell composite with a low thermal expansion property(4.3×10^(-6) K^(-1)). The mechanism of thermal property and microstructure of the present core-shell composites are systematically studied based on different models. Our proposed approach in this study can be widely applicable to numerous advanced materials, which should simultaneously control thermal conductivity and thermal expansion properties.
