Influence of copper powder preparation method and sintering process on the microstructure and properties of porous heat dissipation materials
In the context of the current huge heat generation caused by the increase in power consumption of chips,phase change heat dissipation has become the mainstream heat dissipation method.In order to better un-derstand the characteristics of capillary wicks made by sintering copper powders of different preparation meth-ods,capillary wicks were prepared by vibrating and sintering copper powders prepared by water atomisation,gas atomisation,redox and electrolysis as raw materials,and the pore structures and grain microstructures of the four types of capillary wicks were investigated,and the effects of sintering temperatures on the mechanical properties,porosities and water-absorbent properties of the capillary wicks were tested.The results show that the water aerosolised copper powder,the redox copper powder and the electrolytic copper powder possesse a richer and more connected pore network than the aerosolised copper powder in the capillary wicks made by sintering.The volumetric shrinkage of electrolytic copper powder(56.70％)after sintering at 980 ℃ is much higher than that of the other three powders(water-atomised copper powder:33.23％,air-atomised copper powder:12.22％,and redox copper powder:42.01％)due to its high specific surface area.With the increase of sintering temperature,the strength of capillary wicks increases,the porosity decreases,and the water-absorbing property decreases.
metal powdersinteringvolume shrinkageporositywettability
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