纳秒激光微织构TC4表面的抑冰性能研究

Research on ice suppression of nanosecond laser micro-textured TC4 surface

针对航空发动机进气道前缘唇口位置的结冰问题,利用纳秒激光对TC4进行表面微织构,通过扫描电镜观察不同扫描速度下的钛合金表面形貌以及EDS化学成分组成,结合接触角以及低温冷台水滴冻结的实验数据,分析了纳秒激光扫描速度对钛合金表面抑冰效果的影响。结果表明:在激光扫描速度较低的情况下,随着速度的增大,金属表面的粗糙度先增大,直到形成有序排布的凸起与凹陷后粗糙度开始下降,烧蚀效应逐渐减弱,激光加工时钛合金表面的氧化反应程度减轻;表面接触角随粗糙度的增大而增大,在扫描速度为100 mm/s时接触角最大,钛合金表面的抑冰性能最好。

In order to solve the icing problem at the leading edge lip of aero-engine inlet,the micro texture of Ti6Al4V(TC4)was processed by nanosecond laser.The surface morphology and chemical composition of EDs were observed by scanning electron microscope.Combining the experimental data of contact angle and freezing in low temperature cold table,the influence of nanosecond laser scanning speed on the ice suppression effect of titanium alloy surface was analyzed.The experimental results show that in the case of low laser scanning speed,with the increase of laser scanning speed,the roughness of metal surface first increases,and then decreases after the formation of orderly arrangement of bumps and depressions.With the increase of scanning speed,the ablation effect is weakened,and the degree of oxidation reaction on the surface of titanium alloy is weakened.The surface contact angle increases with the increase of roughness.When the scanning speed is 100 mm/s,the contact angle is the largest,and the ice suppression performance of titanium alloy surface is the best.