Preparation and cutting performance of textured SiAlON ceramic brazing composite tool

Three types of textured SiAlON ceramics (one-dimensional C-axis-oriented, two-dimensional randomly textured, and two-dimensional centripetally textured) were prepared using plastic deformation through extrusion, and then brazed to commercial cemented carbide substrates using vacuum brazing with a commercial Ag-Cu-Ti active brazing alloy to fabricate SiAlON brazed composite cutting tools for superalloy machining, simultaneously non-texture SiAlON cutting tools was prepared. The wear mechanisms of the cutting tools during superalloy machining include adhesive wear , oxidation wear, abrasive wear, and chipping. Among the four tools, the two-dimensional centripetally textured SiAlON composite tool, with rod-like grains oriented parallel to both the rake and flank faces, exhibited the best cutting performance. The reason is that the rod-like grains on its flank face are oriented toward the tool tip, providing enhanced fracture toughness and excellent resistance to chipping in the direction of the workpiece motion.