VERFAHREN ZUR HERSTELLUNG VON WHISKERVERSTÄRKTEN KERAMIKEN

摘要

The present invention relates to a method of making a whisker reinforced ceramic body by hot pressing a preform to a disk, cutting the disk into blanks and grinding the blanks to bodies of desired shape and dimension. According to the invention the preform is prepared by dispersing 10-50 % by volume of a ceramic powder mixture containing conventional sintering aids and/or grain growth inhibitors in water or an organic solvent adding 1-15 wt-% starch to the dispersion pouring the dispersion into a mould with desired shape heating the suspension to 50-100 DEG C for 2-4 hours during covering the mould to avoid water evaporation to form a preform removing the preform from the mould and presintering the preform in air for 10 h at about 600 DEG C.