Preparation and properties of porous layer in copper based high flux heat transfer tube

The sintered high flux heat transfer tube shows the effect of strengthening boiling heat transfer by sintering the porous metal layer with a certain thickness on the inner surface of ordinary heat transfer tube. It is required that the sintering temperature of porous layer cannot damage the base tube properties, the pores in porous layer should be connected and well bonded to the base tube, and the corrosion resistance of porous layer should be similar with that of base tube. A novel alloy powder was designed as Cu-10%Ni-20%Zn-2%Sn by mass in this paper, which is suitable for sintering the inside porous layer used in copper based high flux heat transfer tube (BFe10-1-1), the corrosion resistance of this alloy powder was higher than that of the base tube. The sintering experiment results show that, sintering this alloy powder at 940℃ has no damage to the base tube properties, and the inside porous layer sintered by this alloy powder shows a good bond with the base tube. Meanwhile, the internal pores in porous layer are uniformly connected. Further application experiments also demonstrate that the alloy powder used for porous layer in this paper has an excellent effect on the heat transfer.