With the fabricated preforms, the pressure casting process of porous aluminum alloy was studied.

利用所制备的预制块，研究了多孔铝合金的加压铸造工艺。

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Micro porous gradient ceramics were prepared by gel casting which was invented in the early 90's.

本文采用90年代初发明的注凝成型技术制备微孔梯度陶瓷材料。

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Using a prefabricated porous ferroboron lump, a surface composite layer was made on gray cast iron matrix, with a common casting method.

通过预先制备带有孔隙的硼铁合金预制块，用普通浇注的方法，获得以灰铸铁为基的铸造表面复合材料。

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