| 摘要 |
PURPOSE:To obtain an enameled wiring board having improved heat conductivity at a practical cost by doping glass of an enamel layer with a specific amount of one or more materials selected from a group consisting of AlN, diamond and SiC. CONSTITUTION:An enameled board has a metallic substrate coated with ceramics, and glass in the enamel layer contains 5 to 20% by weight of one or more materials selected from a group consisting of AlN, diamond and SiC. For example, if AlN is to be incorporated, crystallized glass frit and 5 to 20% by weight of AlN powder are introduced into a ball mill together with isopropyl alcohol. In the ball mill, they are wet ground and mixed until particle size becomes 10mum or less. Using this mixture as electrodepositing bath, migration electrodeposition is performed by using, as an electrode, a steel plate to be enameled which has been washed, degreased and plated with a metal such as nickel or cobalt. Finally, the steel plate thus enameled is dried and baked. |
