| 摘要 |
PURPOSE:To obtain the above material capable of obtaining a molded product wherein pores are not formed after sintering by using a specified cellulose derivative as the molding binder for the ceramic material. CONSTITUTION:A cellulose derivative leaving <=1,000 units of the undissolved fiber having 8-200mu diameter in 2cc of its 0.1wt.% aq. soln. is incorporated as the molding binder. To obtain the undissolved fiber range, sufficient amts. of chemical reactants are used in the production of the cellulose derivative, a necessary solvent is selected and used, and the conditions under which a uniform and sufficient reaction could take place must be adopted. When the diameter of the undissolved fiber is smaller than 8mu, the diameter of the pore in the obtained ceramic sintered body is also controlled to <8mu. Consequently, the withstand voltage characteristic of the dielectric ceramic material such as an IC board obtained by printing an conductive layer having about 10-20mu thickness and an insulating layer on the sintered body is not deteriorated. When the fiber diameter is larger than 200mu, the fiber is removed by the about 200mu-mesh screen commonly used in the extrusion molding of ceramics. |
