Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 691, Issue -, Pages 466-473Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.08.234
Keywords
Spark plasma sintering; Flash sintering; Carbon diffusion; Silicon carbide; Strength
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Flash Spark Plasma Sintering (FSPS) that combines flash sintering and electric field assisted sintering was used to densify SiC ceramics. FSPS was compared with 'conventional' SPS which used a moderate 100 degrees C.min(-1) heating rates. Dense SiC specimens were obtained despite being at temperature of 1850-2050 degrees C for few seconds. FSPS lead to generation of hot-spots and thus caused localized exaggerated grain-growth. This allows producing silicon carbide ceramics with bimodal grain size distribution. Analysis of microstructure and strength of silicon carbide ceramics consolidated using flash heating allowed proposing several optimization routes of the FSPS process. (C) 2016 Elsevier B.V. All rights reserved.
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