Microstructure and mechanical properties of silicon carbide processed by Spark Plasma Sintering (SPS) Academic Article uri icon

abstract

  • Abstract The unique combination of SiC properties opens the ways for a wide range of SiC- based industrial applications. Dense silicon carbide bodies (3.18±0.01 g/cm 3) were obtained by an SPS treatment at 2050° C for 10 min using a heating rate of 400° C/min, under an applied pressure of 69 MPa. The microstructure consists of fine, equiaxed grains with an average grain size of 1.29±0.65 μm. TEM analysis showed the presence of nano- size particles at the grain boundaries and at the triple-junctions, formed mainly from the impurities present in the starting silicon carbide powder. The HRTEM examination revealed high angle and clean grain boundaries. The measured static mechanical properties (HV= 32 GPa, E= 440 GPa, σ b= 490 MPa and KC 6.8 MPa m 0.5) and the Hugoniot Elastic Limit (HEL= 18 GPa) are higher than those of hot-pressed silicon carbide samples.

publication date

  • January 1, 2012