High temperature ceramic material suitable for gas turbine applications and a process for producing same

摘要

A method of making improved SIALON ceramics without the need for hot pressing, is disclosed. A homogeneous slip is prepared from Si3N4, Al2O3 and Y2O3 in the presence of a suspension agent; Y2O3 being present in at least 1% by weight (preferably between 1-25%) and Al2O3 being present in the range 16-40% by weight (preferably 16-18%). The slip is cast and dehydrated. The cast shape is reaction sintered at about 1550 DEG -1700 DEG C (preferably 1600 DEG C) for no less than 3 hours (preferably between 3-12 hours).