This work focuses on the wettability transition of nodular cast iron (NCI) modified using a femtosecond laser-produced micro/nano-structure. Laser parameters such as laser fluences (0.10 to 3.18 J/cm²), and scan speed (0.2 to 1.0 mm/s) were varied to realize hierarchical or dual-phase structures. Raman spectroscopy was performed on samples treated at 0.10 to 0.63 J/cm² to investigate the mechanism involved in the disappearance of the graphite nodule with increasing laser fluence. Just-after the laser treatment, surface was superhydrophilic in nature and progressively became superhydrophobic after cleaning and subsequent application of vacuum pressure for 8 h. In the present investigation, a static contact angle (SCA) of 164 ± 4° was measured. The temperature-dependent durability of the superhydrophobic surface was analyzed by heating at a temperature range from 80 °C to 240 °C. The results showed a stable superhydrophobic characteristic up to 120 °C even after five cycles of repetition. Scanning electron microscope (SEM) analysis was conducted to capture the micrograph of structures. Moreover, the chemisorption mechanism during the vacuum process and over the period was analyzed using X-ray photoelectron spectroscopy (XPS) that indicated a higher concentration of non-polar functional groups on the surface could effectively increase the SCA.

这项工作的重点是使用飞秒激光产生的微/纳米结构改性的球墨铸铁（NCI）的润湿性转变。改变诸如激光注量（0.10至3.18J / cm ²）和扫描速度（0.2至1.0mm / s）的激光参数以实现分层或双相结构。拉曼光谱法是对以0.10至0.63 J / cm ²处理的样品进行的研究随着激光能量密度的增加，石墨结节消失的机理。激光处理后，表面本质上具有超亲水性，在清洁并随后施加真空压力8小时后，表面逐渐变得超疏水。在本研究中，测得的静态接触角（SCA）为164±4°。通过在80°C至240°C的温度范围内进行加热，分析了超疏水表面的温度依赖性耐久性。结果显示，即使经过五个重复循环，在高达120°C的温度下仍具有稳定的超疏水特性。进行扫描电子显微镜（SEM）分析以捕获结构的显微照片。而且，