High thermal stability of diamond–cBN–B4C–Si composites |
(color online) XRD patterns for the starting mixed powders and diamond–cBN–B4C–Si samples: (a) the starting mixed powders, (b) the sample synthesized at 5.2 GPa/1680 K for 3 min, and (c) the sample synthesized at 5.2 GPa/1620 K for 5 min. |