Abstract
Monolithic copper honeycombs were fabricated by a plasticizing powder extruding-sintering technology. The effect of sintering conditions on volume shrinkage, apparent density, microstructure, mechanical properties and heat conductivity of copper honeycombs were studied. With increasing sintering temperature and time, the metal particles form sintering necks and gradually coalesces into grains, and volume shrinkage, apparent density and strength increase, and the optimum sintering parameters are 950 °C for 2 h. When sintering temperature rises from 800 to 1000 °C, the volume shrinkage ranges from 15 to 30%, and the apparent density ranges from 1.49 to 1.74 g/cm3. When sintering time increases from 1 to 2.5 h, the volume shrinkage ranges from 18 to 27%, and the apparent density ranges from 1.52 to 1.70 g/cm3. Under axial compression, the yield strength ranges from 7.2 to 20.4 MPa. Under radial compression, the yield strength ranges from 2.1 to 3.5 MPa. The longitudinal and transverse effective thermal conductivity of monolithic copper honeycomb was calculated by parallel and series models, respectively. The maximum longitudinal effective thermal conductivity of copper honeycomb is 50.26 W/(m K) and the maximum transverse effective thermal conductivity is 0.033 W/(m K), which indicates that the longitudinal heat transfer of copper honeycomb is much better than transverse. It can be designed as heat sinks by using the performance of longitudinal thermal conductivity of copper honeycombs.
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Acknowledgements
The authors would like to gratefully acknowledge the National Nature Science Foundation of China (Grant No. 51861020) for providing the financial support for this work. The authors would like to thank Yunnan Key Laboratory of New Material Producing and Processing for technical supports.
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Zhang, G., Liang, J., Song, S. et al. Microstructure and properties of copper honeycombs prepared by powder extruding and sintering process. J Porous Mater 29, 1969–1979 (2022). https://doi.org/10.1007/s10934-022-01305-2
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DOI: https://doi.org/10.1007/s10934-022-01305-2