レーザ照射による金属表面での炭酸カルシウム膜の作製

抄録

In order to establish a new approach to manufacturing of CaCO₃ which can be adapted to structural materials, the formation of CaCO₃ using continuous-wave laser has been conducted on austenitic stainless steel JIS SUS316L surface. It has been demonstrated that localized heating by laser irradiation could control the formation. CaCO₃ was obtained from heating Ca(HCO₃)₂. The film thickness of CaCO₃ formed at various conditions was measured, therefore it was revealed the effect of various factors on the formation of CaCO₃. The higher laser power P, the thicker the film thickness of CaCO₃, however, high laser power (1.5 W) decreases the film thickness when laser irradiation is continued for many hours. Changing the distance from condenser lens d to specimen, it can control the film thickness and the width of CaCO₃ film without increasing energy. When the velocity of specimen v is 1.0 mm/s, the film thickness is the highest among other velocities and the shape of CaCO₃ film is clear. The temperature of Ca(HCO₃)₂ T_w have not much effect on the film thickness, although the temperature have effect on the width of CaCO₃ film. Therefore, CaCO₃ film can be formed efficiently by controlling the factors such as laser power. The optimum condition of fabrication of CaCO₃ which we inferred from these results was P = 1.0 W, d = 30 mm, v = 0.1 mm/s, T_w = 45 °C, laser irradiation time t = 5 h. This manufacturing have probability to be able to fabricate the structure of CaCO₃ flexibly.