激光制备仿生非光滑表面蠕墨铸铁的耐磨性

Wear resistance of compact graphite cast iron with biomimetic non-smooth surfaces processed by laser

模仿自然界中典型土壤动物的体表形态,运用激光加工的方法在蠕墨铸铁试样表面雕刻出不同形态、不同分布间距、不同倾斜角度的仿生非光滑单元体,研究了仿生非光滑表面试样的耐磨性,探讨了磨损机制。结果表明:仿生非光滑表面试样的耐磨性均优于未处理试样;非光滑单元体形态、分布间距、倾斜角度对试样的耐磨性均有影响;其中具有网格状非光滑单元体的试样耐磨性最好,条纹状次之,点状最差;单元体分布间距减小时,可进一步提高耐磨性;非光滑单元体倾斜角度为45°时,试样的耐磨性优于0°和90°;磨损机制以黏着磨损为主。

To mimic the cuticles of some typical soil animals, series biomimetic non-smooth surface specimens with different unit shapes, distributed spaces and slopping angles were prepared by laser processing. The wear behaviors of the specimens under dry sliding were investigated. The results indicate that the biomimetic non-smooth surface specimens possess better wear resistance than the untreated specimens. The specimen with grid non-smooth units has the best wear resistance, the specimen with stria units takes the second and that with convex units is the worst. The wear resistance is enhanced by reducing the distributed spaces of the non-smooth units. The wear resistance of the stria non-smooth specimen with slopping angle of 45° is better than those with slopping angles of 0° and 90° respectively. The adhesive wear is the dominative wear mechanism.