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Electric Current Pulse Activated 6 H →3 C Transformation in Silicon Carbide Compacts
Author(s) -
Limeng Liu,
Feng Ye,
Yu Zhou
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04708.x
Subject(s) - spark plasma sintering , silicon carbide , materials science , sintering , transformation (genetics) , current (fluid) , phase (matter) , carbide , plasma , metallurgy , silicon , electric current , analytical chemistry (journal) , electrical engineering , chemistry , biochemistry , physics , organic chemistry , quantum mechanics , gene , engineering , chromatography
6 H ‐ SiC powder mixed with Si 3 N 4 , Al 2 O 3 , Y 2 O 3 , and AlN was sintered in a spark plasma sintering ( SPS ) equipment. The 6 H →3 C SiC transformation was concerned. Research results indicated the polytype transformation completed in less than 30 s by imposing a 14 458 W (6.2 V, 2332 A) transitory DC current at 1700°C upon cooling down from 2000°C. The fast transformation kinetic and the significant 3 C ‐ SiC grain growth accompanying the phase transformation were suspected to be correlated with the pulsed SPS direct current.