The difficulties of casting high melting silicides and their poor sinterability Limit structural and functional applications up to now. Furthermore mechanical properties of single phase silicides (MoSi2, TiSi2, Ti5Si3,...) are insufficient at room temperature (fracture toughness) and above the brittle to ductile transition (BTDT) (creep). Approaches for advantages are concentrated on silicide composites using different hard phases (SiC, TiB2, ZrO2,...), mixtures of silicides (e.g. (Mo,W)Si-2) and introduction of ductile metallic phases (e.g Nb) for strengthening the matrix. Our investigations on MoSi2-composites using the reactive sintering technique of activated powder mixtures proved a high level of mechanical properties. In particular we found for 4-point bending strength: 500 MPa (RT) and 700 MPa (1100 degrees C); K-IC (crack prolongation method): 5 MPam(1/2) (0 Vol.% SiC) and 8,4 MPam(1/2) (30 Vol.% SiC), creep rate: 10-5 (0% SiC) 10-6 (30Vol.% SiC). This data are at least as high as reported by other authors but in contrary to the state of art the preparation of complex parts should be possible. Furthermore it was shown that the materials show good corrosion resistance under flue gas atmosphere with high gas pressures and high gas speed.