Morphological Change of Large Pores in Alumina Ceramics in the Final Stage of Densification

摘要

Morphological change of a large pore was evaluated for the final stage of densification in alumina ceramics. Specimens prepared at various sintering temperatures were graound to a thickness of 150 mum. The internal structures of the sintered specimens were examined with an optical microscope in transmission mode to determine the location of large pores. Detailed structures of the large pores were evaluated by scanning electron microscopy after exposition on the surface by polishing. The large pores have a crack-like shape in the specimens singered at 1350 deg C. Over singered specimens contained large porosity area consisting of many small pores.