- 學位論文
雷射紋理技術對316L不鏽鋼疏水性表面特性分析
Analysis of hydrophobic surface characteristics of 316L stainless steel by laser texture
摘要
本研究主要探討以光纖雷射對316L不鏽鋼進行紋理雕刻並分析其紋理表面疏水性，創造出超疏水表面，同時分析不同雷射參數對紋理表面疏水性及粗糙度的影響，加工參數包含掃描間距、功率、雕刻次數以及不同的紋理路徑，研究結果顯示在剛完成雷射處理時的表面都是呈現超親水性的，並會隨著時間逐漸變為疏水性。當雷射能量提升會造成粗糙度上升以致疏水性上升。綜合雷射參數實驗得到之趨勢，經掃描式電子顯微鏡(SEM)觀察紋理結構顯微特徵形態，發現紋理表面都有毛細產生，再經X射線光電子能譜(XPS)成分分析及X光射線繞射儀(X-ray)繞射分析檢測發現在經雷射處理後的紋理表面會有活性磁鐵礦的相產生，而活性磁鐵礦使得紋理表面會隨著時間產生碳含量上升氧含量下降的現象。本研究也在紋理表面上添加不同的金屬薄膜，目標為提升表面接觸角。在表面添加銀及銅薄膜時會因此兩種材料的表面自由能較低而使的紋理表面疏水性上升；而添加鋁及鋅薄膜時則會因自由能上升而使接觸角下降。另外，本研究也針對疏水表面的特性進行實驗，實驗結果發現疏水性表面在溼式環境的耐磨耗性質提升；再結合模擬結果也發現疏水性表面對於沸騰氣泡成型有很大的改善；疏水性表面也改善了材料的耐腐蝕性，再添加上不同薄膜後更使耐腐蝕性提升。
並列摘要
This study mainly discusses the texture engraving of 316L stainless steel by fiber laser and analyzes the hydrophobicity of the textured surface to create a super-hydrophobic surface. At the same time, the influence of different laser parameters on the hydrophobicity and roughness of the textured surface is analyzed. The processing parameters include the scanning pitches, power, number of engravings, and different texture paths, the results show that the surface is super-hydrophilic right after the laser treatment, and gradually becomes hydrophobic over time. When the laser energy increases, the roughness increases, and the hydrophobicity increases. Based on the trend obtained from the laser parameter experiment, the microscopic features of the textured structure were observed by scanning electron microscope (SEM), and that was found that capillaries were produced on the textured surface. X-ray diffraction analysis and detection found that the active magnetite phase will be produced on the textured surface after laser treatment, and the active magnetite will make the carbon content increase and the oxygen content decrease on the textured surface with time. This study added different metal films on the textured surface to increase the surface contact angle. When silver and copper films are coated on the surface, the hydrophobicity of the textured surface increases due to the lower surface free energy of the two materials, while when aluminum and zinc films are coated, the contact angle decreases due to the increase in free energy. In addition, this study also conducted experiments on the characteristics of hydrophobic surfaces. The experimental results found that the wear resistance properties of hydrophobic surfaces in wet environments were improved. Combined with the simulation results, that was also found that the hydrophobic surfaces greatly improved the formation of boiling bubbles, and the hydrophobic surface also improves the corrosion resistance of the material, which is further enhanced by reapplying different films.