SYNTHESIS OF 312 PHASES AND COMPOSITES THEREOF

摘要

Products having single phases or solid solutions of the formula M3X1Z2 wherein M is a transition metal, X is Si, Al or Ge and Z is B, C or N can be prepared by taking a powdered mixture containing M, X and Z to a temperature of about 1000 DEG C to about 1800 DEG C, optionally simultaneously under a pressure of about 5 MPa to about 200 MPa. The products so formed have excellent shock resistance, oxidation resistance and machinability. The products may also be present as composites, preferably composites which are in thermal equilibrium with the single phase or solid solutions of the formula M3X1Z2.