Patent ID: 11905219
Assignee: COORSTEK KK
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 3:
4. A method for preparing the alumina ceramic according to claim 1, the method comprising:
mixing an alumina source, the alkaline earth metal, and the element of period 3, 4 or 5 so as to have 0.05 to 1 wt % of total weight of the alkaline earth metal and the element of period 3, 4 or 5 based on the alumina source,
granulating a mixture of the alumina source, the alkaline earth metal, and the element of period 3, 4 or 5 so that it has a circularity of not less than 0.5 and that the alumina source has a particle size of 0.2 to 1.5 μm, wherein a mixed granule is formed, and
compression molding and sintering the mixed granule.