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利用定向凝固法分别在0.55、0.7及1mm/s的拉速下制备出了具有规则气孔分布的藕状多孔铜,并采用非破坏性纳米CT扫描技术对所制备的多孔铜结构进行CT扫描及三维体重构,研究了拉速对气孔形核及形核数目、气孔率以及孔径大小和分布的影响。结果表明,随着凝固进行,气孔形核数目逐渐减少并且趋于稳定,在整个定向凝固过程中,都存在新气孔的形核现象。当拉速增加时,铸锭在相同高度范围内新气孔的形核数目增加,气孔的平均直径减小,气孔的尺寸分布均匀性下降。
The copper-based porous copper with regular pore distribution was prepared by directional solidification at 0.55, 0.7 and 1 mm / s, and the non-destructive nano-CT scanning technique was used for CT scanning of the prepared porous copper structure. Three-dimensional volume reconstruction, the pull speed on the nucleation and nucleation and the number of nuclei, porosity and pore size and distribution. The results show that as the solidification progresses, the number of stomatal nucleation gradually decreases and tends to be stable. During the entire directional solidification process, the nucleation of new stomata exists. When the casting speed increases, the number of new pores in the ingot increases in the same height, the average diameter of pores decreases, and the uniformity of pore size distribution decreases.