| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing ceramic substrates, enabling to control blisters generated on the surfaces of ceramic green sheets by disposing the ceramic green sheets on a porous substrate which is disposed on a rack plate in a sintering oven and has a specific profile irregularity, and subsequently sintering the green sheets. SOLUTION: This method for producing ceramic substrate comprises disposing a porous substrate on a rack plate in a sintering oven, disposing ceramic green sheets on the porous substrate, and subsequently thermally sintering the ceramic green sheets. The porous substrate comprises an alumina ceramic substrate having a profile irregularity Ra of <=2.0, a porosity of >=15% and plural penetrated holes and is obtained by laminating alumina granules having a granule diameter of 0.1-2.0 mm and subsequently thermally calcining the laminate. When alumina granules having a small granule diameter are used to give a low porosity after the calcination, penetrated holes having a diameter of 1.0 mm are formed at distances of 5 mm before the calcination, and subsequently calcined to secure a porosity of >=15% in the porous substrate. |
