| Electrically Conductive Silicon Carbide without Oxide Sintering Additives |
| Frantiska Frajkorova, Zoltan Lences, Pavol Sajgalik |
| Institute of Inorganic Chemistry, Slovak Academy of Sciences |
|
|
|
|
|
| ABSTRACT |
|
This work deals with the preparation of dense SiC based ceramics with high electrical conductivity without oxide sintering additives. SiC samples with different content of conductive Ti-NbC phase were hot pressed at $1850^{circ}C$ for 1 h in Ar atmosphere under mechanical pressure of 30 MPa. The conductive phase is a mixture of Ti-NbC in weight ratio of Ti/NbC 1:4. Composite with 50% of conductive Ti-NbC phase showed the highest electrical conductivity of $30.6{times}10^3;S{cdot}m^{-1}$, while the good mechanical properties of SiC matrix were preserved (fracture toughness 4.5 $MPa{cdot}m^{1/2}$ and Vickers hardness 18.7 GPa). The obtained results show that use of NbC and Ti as sintering and also electrically conductive additives is appropriate for the preparation of SiC-based composite with sufficient electrical conductivity for electric discharge machining. |
| Key words:
SiC, Hot-pressing, Composites, Electrical conductivity, Hardness |
|
|
|
PDF Links
Full text via DOI
Download Citation 
