Spark Plasma Sintering of Silicon Carbide with Al2O3 and
CaO: Densification Behavior, Phase Evolution and
Mechanical Properties |
Ummen Sabu,a Bhaskar Majumdar,b Bhaskar P. Sahac and Dibakar Dasa, *
aSchool of
Pages : 202-208
DOI : 10.1080/0371750X.2018.1521304 |
Abstract |
Liquid phase sintering (LPS) often yield an amorphous grain boundary region which
deteriorates the high temperature properties of the sintered ceramics and thus
ceramists prefer to obtain a crystalline grain boundary after LPS. This paper deals
with LPS of silicon carbide ceramics to near theoretical density, understanding the
densification behavior, evolution of gehlenite phase and subsequent evaluation of
their mechanical properties. High density SiC ceramics were fabricated from submicrometre
ï¡-SiC powders with the aid of refractory phase forming metal oxide
additives by spark plasma sintering. Sintering temperature and holding time at peak
temperature were varied to study their effect on densification and mechanical
properties. Density of the sintered ceramics reached ~97% at 1800oC. Microstructural
features and crack propagation mode were studied using scanning electron
microscopy. XRD analysis confirmed the presence of crystalline gehlenite phase in
the sintered samples. Hardness, fracture toughness and flexural strength of the
sintered ceramics were determined by standard test procedures.
[Keywords: Silicon carbide, Liquid phase sintering, Spark plasma sintering,
Mechanical properties, Fracture toughness] |
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