Low temperature spark plasma densification of nano-SiC powder with novel Al2O3-Ho2O3 additives for SiC/SiC applications

摘要

In the current work, a novel liquid additive system consisting of Al2O3 and Ho2O3 was introduced to achieve spark plasma densification of nano-SiC powder at both low temperature (1700 degrees C) and moderate pressure (20 MPa). For the SiC sample sintered with 7.5 wt% additives, we obtained relative density of 98.6%, bending strength of (617 +/- 43) MPa, Vickers hardness of (23.2 +/- 0.3) GPa, and indentation toughness of (3.4 +/- 0.1) MPa m(1/2). (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.