Reduction of Adhesion between Steel and Grilled Fish Protein with Ultra-Hydrophobic DLC

概要

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There is an issue of the fish adhering to the metal grids of grill strongly after grilling fish. Recently, the temperature in a grill equipment is over 500 °C, Fluorine resin coating which has low adhesion property can not endurant at 500 °C. In order to overcome this issue, we proposed a new grill not to adhere a fish with Ultra-Hydrophobic Diamond-like Carbon coating named as UH-DLC coating. UH-DLC coating has high hydrophobicity. We expected this coating to decrease wettability of water including fish protein and contact area, because fish protein includes about 90% water. Contact angle of water on UH-DLC was over 120° at room temperature. After heating at 500 °C for 54 minutes, UH-DLC kept ultra-hydrophobic property. On the other hand, Fluorine resin coating desappeared hydrophobic properties after heating at 500 °C for 54 minutes. It was conducted adhesion test for UH-DLC coating, Fluorine resin coating and no coating grilling rods after the grilling of real fish in a grill equipment by gas. The adhesion force between UH-DLC coating grill rods and real fish was as half as that of no coating grill rods and as much as that of Fluorine resin grill rods. So, we believe that Ultra Hydrophobic Diamond-like Carbon coating has a possibility for the usage as new grilling grids at high temperature.