Some sialons prepared from nanopowders by hot pressing

Investigation of fabrication of ?-sialon and ?-/?-sialon ceramics from nanopowders by hot pressing (1800 and 1910 ?C) were carried out. Samples of sialons were made by using Si3N4-AlN nanopowders composites fabricated by the method of plasmachemical synthesis. The hardness of materials from nanopowders are of HV1 = 17,6-21,9 GPa, bending strength of ?3p = 520-800 MPa and fracture toughness up to Klc = 7,1 MPa.m1/2, depending on composition and compacting temperature.