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采用粉末冶金工艺制备基体致密、表层多孔含油的双层复合铁基含油材料,用HDM-20端面摩擦磨损试验机评价其摩擦磨损性能。结果表明,改变表层中TiH_2的含量可以实现孔隙率的变化,有效改善润滑性能,适宜TiH_2的含量可满足复层材料力学性能和润滑性能的平衡;在较高负载工况时,复层材料润滑性能较单层烧结材料好,且随着表层厚度的增加,摩擦系数先降低后升高,当表层厚度占材料总厚度的50%时,复层材料的承载能力最高,摩擦磨损性能最好。
The powder metallurgy process was used to prepare double-layered composite iron-based materials with dense matrix and porous surface oil. The friction and wear properties of the composites were evaluated by the HDM-20 friction and wear tester. The results show that changing the content of TiH 2 in the surface layer can change the porosity and effectively improve the lubrication performance. The suitable content of TiH 2 can satisfy the balance of the mechanical properties and the lubricating property of the composite material. At higher load conditions, the composite material lubricates Compared with the single layer sintered material, the friction coefficient decreases first and then increases with the increase of the surface layer thickness. When the surface layer thickness accounts for 50% of the total material thickness, the composite material has the highest bearing capacity and the best friction and wear properties.