| 简介 |
The invention relates to a ceramic Sialon-material with homogeneous crystalline structure, on alpha-sialon, beta-sialon and amorphous or partially crystalline grain boundary phase or is based. Also the invention relates to a method for the production of ceramic Sialon-materials from a powder mixture, containing silicon nitride, alumina, aluminum nitride and additives. Is used in the construction of machines in particular as Cutting material or the material, equipment and plant construction and in the chemical industry. It was problem of the present invention, provide a ceramic Sialon-Materials, in which an inhomogeneous structure is avoided and thus an improved fracture toughness is achieved. The ceramic sialon-Materials 100% vol with homogeneous crystalline structure 20 contains alpha-sialon-(R x Si 12 - (m + n) Al m + n O n N 16-n ) with 0 6-z Al z N 8-z O z with 0 < < z = 2 and 0 to 15 vol % amorphous and/or semi-crystalline grain boundary phase. Furthermore, in the alpha-sialon R selected cations, such as a) rare earth metals, selected from the group Gd to Lu, Y and mixtures thereof, b) rare earth metals, selected from the group La, Pr, Sm, Nd, and mixtures thereof, and c) mg, contain. |
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