Table 1: Different preparation methods and properties of silicon carbide.

Materials Density (g/cm3) Free state of Si Isotropic Cost Preparation cycle Surface modification HP-SiC 3.20 No Bad High Short term Requirement RB-SiC 3.04 Yes Good Low Short term Requirement S-SiC 3.10 No Worse Lower Long term Requirement CVD-SiC 3.21 No Best High Long term Nonrequirement