SiAlON CERAMIC AND METHOD OF MAKING THE SAME

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An alpha prime-beta prime SiAlON ceramic body (20, 30), as well as a method for making the same, made from a starting powder mixture that includes silicon nitride powder that has a beta-silicon nitride content with a range having a lower limit equal to zero weight percent and an upper limit equal to about 1.6 weight percent of the silicon nitride powder. The powder mixture also includes one or more powders that provide aluminum, oxygen, nitrogen, and two selected rare earth elements to the SiAlON ceramic body wherein the selected rare earth elements are selected from at least two groupings of three specific groupings of the rare earth elements. © KIPO & WIPO 2008