Abstract
Vitreous enamels are one of ceramic coatings and have beautiful surface and excellent corrosion resistance. However, practical uses have been limited for the present, because they have a defect of low impact resistance. In this study, the influence of adding metal powders to enamel upon the adhesion was investigated, because the adhesion between enamel and substrate is the most important factor influencing the impact resistance.
The adhesion was improved by adding any metal powders to enamel, and excellent adhesion enough for practical uses could be obtained by large amount of additives and high fusing temperature even without expensive pretreatment of substrate. Especially, this improvement of adhesion tended to depend on the volume content of additives, which seemed to be due to the mechanical binding between the roughened surface of substrate and the coating, and the chemical binding of intermediate transition layer formed by dissolving the oxide of substrate in a coating.
