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通常人们所见到的金属材料大都是致密的,若采用特殊生产工艺就可使金属内部产生很多孔隙,这种金属称为多孔体金属。多孔体金属分为多泡性金属和通气性金属两大类。两者的主要区别在于前者的孔隙是独立的,和外部无联系,而后者是连续相通的。多孔体金属中孔隙所占的体积百分效称为孔隙度,它是衡量多孔体金属的重要指标。孔隙度达到90％以上,具有一定强度和刚度的多孔体金属称为泡沫金属。这类金属孔隙含量高,孔隙直径可达毫米级,几乎是连通孔,因而它属于通气性金属。
Usually people see the metal materials are mostly dense, if the use of special production process can make a lot of metal pores, this metal is called porous metal. Porous metal is divided into multi-bubble metal and breathable metal two categories. The main difference between the two is that the pores of the former are independent and have no connection with the outside while the latter are continuously connected. The volumetric effect of porosity in porous metal is called porosity, which is an important index to measure the porous metal. Porosity reached more than 90%, with a certain strength and stiffness of porous metal called foam metal. Such metal pore content is high, the pore diameter up to millimeter-level, almost continuous hole, so it belongs to the ventilation of metal.