| 摘要 |
PURPOSE:To suppress cracks by blending PZT powder with a void forming material, a dispersant and water, then adding a specific amount of a water-soluble binder to give a slurry, introducing to a mold, subjecting to slip casting to give a molded article and burning. CONSTITUTION:Calcined PZT powder is blended with a void forming material such as spherical carbon fine particles, a dispersant and water. 1-5 pts.wt. water- soluble binder is added to 100 pts.wt. total amount of the PZT powder and the void forming material in the blend to give a slurry, which is fed to a slip casting mold of given shape, molded and dried to give a molded article 1. A slurry containing the void forming material is molded by the similar molding mold and, in a state of the surface of the molded article before drying, a slurry not containing the void forming material is poured to the molded article. These operations are alternately repeated to give a molded article 2 comprising plural layers wherein the void forming material is asymmetrically dispersed. The molded article 1 or 2 is heat-treated to remove the binder or the void forming material and burnt to give a porous PZT ceramic. |
