Abstract
A ceramic coating with super hydrophilicity characteristics (the contact angle θ=0°) was prepared by the thermal spraying technique using calcinations powders recovered from the waste dry batteries (IZC). Evaporation behavior and evaporation time of a water droplet for the IZC coatings on a mild steel substrate were examined. It was found that the water droplet did not show the Leidenfrost phenomenon on the IZC coatings surface, and the evaporation time remarkably shortened compared with those on the grinding or blasted surfaces of the mild steel substrate. On the other hand, the cooling speed in soaking the heated test piece in boiling water was examined. The cooling speed of the IZC coated substrate remarkably increases in the initial stage, since it changes from film boiling to nucleate boiling. These facts suggest that the IZC coatings are effective for improvement in the evaporation and cooling speed.
