铜基高通量换热管内多孔层的制备及性能研究

烧结型高通量换热管是通过在普通换热管内表面烧结一定厚度的多孔金属层达到强化沸腾传热的效果，多孔层的烧结温度对基管性能不能有损伤，同时要求多孔层本身孔隙连通，与基管结合较好，且耐蚀性与基管相当。本文设计了一种适用于铁白铜基管（BFe10-1-1）的管内多孔层烧结合金粉末Cu-10% Ni-20% Zn-2% Sn（质量分数），该粉末成分耐蚀性优于基管。烧结实验结果表明，该合金粉末在940℃下烧结时对基管性能无损伤，烧结后与基管结合良好，同时粉末多孔层内部孔隙均匀联通；进一步的应用实验也证明，该多孔层合金粉末具有非常好的传热效果。

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.