Important advantages are still achieved in cycle time reduction and the ability to cast near net shape castings with minimal porosity.

最大的优点仍是减少生产周期，并且能铸造出含有最少量气孔的铸件。

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Experimental results showed that the structure, porosity and particle size of ludwigite ores have a significant effect on the reduction rate.

实验结果表明，矿石结构、孔隙度和颗粒的大小对还原率有明显的影响。

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So, there may exist the phenomenon of permeability reduction with the porosity increase.

因此，可能存在孔隙率增加而渗透性降低的现象。

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