INSULTING COATING METHOD FOR ELECTRIC HEATING CATALYSIS

摘要

PURPOSE: An electrical insulation coating method is provided in which the surface of a metallic thin plate is uniformly coated, flexibility of the coating layer is maintained due to the thin coating thickness, cracks are not formed during manufacturing a round shaped product, and costs required in coating are less while cracks are not generated during drying and firing. CONSTITUTION: The method for electrical insulation coating an electric heating catalyst comprises the processes of preparing a coating solution by using an alumina sol as a coating material paying a part as an electric insulation raw material as well as a binder and adding ethyl alcohol as a diluent to the alumina sol; immediately drying the dipped metallic thin plate using a hot air dryer by taking out the same from the coating solution after dipping a metallic thin plate into the prepared coating solution for one minute; completely fusing the coating layer onto a metallic thin plate after putting the dried plate into an electric furnace which is maintained to 900 deg.C for 10 to 20 minutes; and repeating the above processes 3 to 4 times so that a thickness of the coating layer becomes 5 to 8 microns.