Electrically conductive SiC-(Nb,Ti)_(ss)-(Nb,Ti)C_(ss) cermet

摘要

The present paper deals with the processing method of SiC-(Nb,Ti)_(ss)-(Ti,Nb)C_(ss) composites. The electrically conductive phases were formed by in situ reaction: NbC_(s) + Ti_(s)- > (Nb,Ti)_(ss) + (Ti,Nb)C_(ss) that takes place during the reaction sintering by hot pressing. Prepared composites exhibit good compromise between electrical and mechanical properties and the present approach allows preparing a wide variety of compositions. For example composites containing 80 wt. percent SiC and 20 wt. percent {(Nb.Ti)_(ss)-(Ti,Nb)C_(ss)} have an electrical resistivity 2.6 X 10~(-4) OMEGA m, hardness 21.6 GPa and fracture toughness 6.3 MPam~(1/2).