[...]doped one Alpha-Beta-

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Α-β-SiAlON-composite and The invention relates to a, comprising an α-SiAlON-, β-SiAlON-and an intergranular amorphous and/or a crystalline phase. Α-SiAlON-phase is prepared from a The multi-cation -mixture, comprising the element calcium, at least one element selected from yttrium and/or rare earths with an atomic number greater 62 and at least one rare earth element having an atomic number equal to or less 62, to improve hardness hard materials are admixed with the.