Oxidation Resistance and Anti-Corrosion of Si_3N_4/SiC (n) Nanoceramic Composite Materials

Si-3N-4/SiC (n) nanoceramic composite materials were prepared through reinforce Si-3N-4 micron particle with nano-sized SiC particle by using polar dispersant and ultrasound disperse and vacuum-sinter-pressing technology. The effect of nano-sized SiC particle on the oxidation resistance and anti-corrosion of composite materials was studied. Results showed that the resistance to oxidation of SiC/Si-3N-4 nanoceramic composite material in air was increased with adding of nano-sized SiC particles. The oxidation resistance of SiC/Si-3N-4 nanoceramic composite material was the best with 15wt% nano-sized SiC. SiC/Si-3N-4 nanoceramic composite material was also suitable for alkaline and could be used in acid or alkali.