机械加工对烧结金属多孔材料孔隙的影响

建立了烧结金属多孔材料连通孔隙形成的模型,通过控制机械压制压力获得了一定孔隙率的金属多孔材料。为了拓展烧结金属多孔材料在工业领域中的应用,文中研究了放电线切割、水切割和磨削加工对材料表面孔隙结构及材料透气性的影响,采用扫描电镜和显微镜分析了材料加工后表面上孔隙的形貌。实验结果表明,放电线切割、水切割和磨削对烧结金属多孔材料加工之后,材料被加工的表面孔隙被部分堵塞,材料的透气性有一定程度的降低,但材料内部的孔隙仍有较好的连通性。

Effects of Mechanical Process on Pores of Sintered Porous Metal

Geometrical models are built for connected pores of the sintered porous metal.The mechanical compaction force is controlled to obtain the porous metal with the certain porosity.To exploit the application of the sintered porous metal in industry,this paper studies the effect of EDM,water jet cutting and grinding on the pore structure of the material surface and the gas permeability.SEM and the microscope are used to observe the pore morphology of the porous metal surface after the material is machined.Experimental results show that some pores on the material surface are stuffed after the sintered porous metal is machined by EDM,water jet cutting and grinding,so the gas permeability decreases to a certain extent,but the gas permeability of pores inside the material is maintained.