On melting of silicon carbide under pressure
  The melting of silicon carbide has been studied at pressures 5-8 GPa and temperatures up to 3300 K. It has been found that SiC melts congruently, and its melting curve has negative slope of -44 +/- 4 K/GPa. 
Petr S. Sokolov, Vladimir A. Mukhanov, Thierry Chauveau, Vladimir L.   Solozhenko
cond-mat.mtrl-sci