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Oxidation Behavior of Zirconium Diboride Silicon Carbide Produced by the Spark Plasma Sintering Method
Author(s) -
Carney Carmen M.,
Mogilvesky Pavel,
Parthasarathy Triplicane A.
Publication year - 2009
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.1551-2916.2009.03134.x
Subject(s) - materials science , spark plasma sintering , sintering , scanning electron microscope , zirconium diboride , silicon carbide , layer (electronics) , transmission electron microscopy , crucible (geodemography) , composite material , oxide , silicon , borosilicate glass , carbide , zirconium , metallurgy , nanotechnology , chemistry , computational chemistry
Dense samples of ZrB 2 –20 vol% SiC were successfully fabricated by spark plasma sintering without the use of sintering aids. Oxidation behavior of these samples was characterized by exposing them to 1400°, 1500°, and 1600°C in an ambient atmosphere for 150 min, and by measuring the weight gains of the sample and crucible, as well as the thickness of the oxide scale and the glassy outer layer. The effects of gravity on the viscous outer layer are shown to result in significant heterogeneity within a sample. The oxidation scales were characterized by scanning electron microscopy and transmission electron microscopy with energy dispersive spectroscopy analysis. The oxide scale was found to be composed of three layers: (1) a SiO 2 ‐rich glassy outer layer, (2) an intermediate layer of a ZrO 2 matrix with interpenetrating SiO 2 , and (3) a layer containing a ZrO 2 matrix enclosing partially oxidized ZrB 2 with Si–C–B–O glass inclusions.