SiC Ceramic Substrates Research Articles

Laser cladding of SiC/Si composite coating on Si–SiC ceramic substrates

Pieces of silicon infiltrated silicon carbide (Si–SiC) were coated with a SiC particles reinforced Si matrix composite (SiC/Si) obtained from mixtures of SiC + SiO 2 and SiC + Si by laser cladding. A Nd:YAG pulsed laser delivering an average power of 920 W was used to apply such coatings using the powder blowing technique. The results demonstrate that the use of the SiC + SiO 2 powder mixture produces a severe damage on the base material, whereas the use of the SiC + Si mixture leads to the formation of sound coatings without substrate damage. XRD and nanoindentation measurements corroborate the production of silicon carbides surrounded by a metallic silicon matrix. This method could be used for repairing surface defects of silicon infiltrated silicon carbide ceramics (Si–SiC).

High Velocity and High Coupling Surface Acoustic Waves Using ZnO Films on Ceramic Substrates with High Acoustic Velocity

The layered structure comprising a c-axis normally oriented ZnO piezoelectric film and Al2O3, AlN and SiC ceramic substrates which have high surface acoustic wave velocity and small surface roughness has given both high phase velocity and high coupling k2 for the 0th (Rayleigh) mode, 1st (Sezawa) mode, and leaky mode surface acoustic waves.