| 摘要 |
PROBLEM TO BE SOLVED: To obtain uniform ceramic granules excellent in fluidity by charging a closed type kneading vessel with raw materials comprising ceramic powder and a binder followed by adding a solvent to the materials and conducting a kneading and then by reducing the pressure in the vessel followed by agitation while evacuating the vessel of the solvent. SOLUTION: A kneading vessel designed to be equipped with plural agitating blades 4 in a closed vessel 1 is charged with raw materials comprising ceramic powder (e.g. alumina) and a binder (e.g. polyvinyl alcohol) as the main components and also, according as necessary, containing a plasticizer (e.g. phthalic ester) and/or dispersant followed by conducting a mixing. After ending the mixing process, a solvent (e.g. acetone) is put, via a charging port 5, into the mixture in the vessel; and in such a state that the kneaded product becomes a large mass and its viscosity comes to 1000Pa.s or higher, a kneading operation is conducted for a specified time. After ending the kneading process, a deaeration is carried out via a deaerating port 6 to reduce the pressure in the vessel, and an agitation is continued while evacuating the vessel of the solvent. Thereafter, the kneaded product is ground into granules, thus obtaining the objective ceramic granules 8. |
