In situ microscopy observation of liquid flow, zirconia growth, and CO bubble formation during high temperature oxidation of zirconium diboride-silicon carbide

Sindhura Gangireddy; Sigrun N. Karlsdottir; S. J. Norton; J. C. Tucker; John W. Halloran

doi:10.1016/j.jeurceramsoc.2010.01.034

In situ microscopy observation of liquid flow, zirconia growth, and CO bubble formation during high temperature oxidation of zirconium diboride-silicon carbide

Sindhura Gangireddy, Sigrun N. Karlsdottir, S. J. Norton, J. C. Tucker, John W. Halloran^*

^*Corresponding author for this work

Faculty of Industrial Engineering, Mechanical Engineering and Computer Science

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

The oxidation of ZrB₂-SiC composites at 1450-1650°C was directly observed with in situ optical microscopy. Video frames showed the flow of silicate liquids, the formation of zirconia deposits, and the growth and collapse of gaseous bubbles on the oxide surface. Contrast in the incandescence of in situ images is analyzed as spatial variations in hue and intensity and related to differences in emissivity of the oxide scale surface features by comparing these hot images with room temperature images. Above 1450°C, gaseous bubbles were observed to grow and collapse causing perturbations in the liquid oxide on the surface. The bubbles are associated with the evolution of CO from SiC oxidation and the onset is related to the critical temperature where the partial pressure of CO under the oxide scale exceeds atmospheric pressure.

Original language	English
Pages (from-to)	2365-2374
Number of pages	10
Journal	Journal of the European Ceramic Society
Volume	30
Issue number	11
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2010.01.034
Publication status	Published - Aug 2010

Bibliographical note

Funding Information:
We thank the Office of Naval Research for funding this research under grant N00014-02-1-0034 .

Other keywords

Borides
Composites
In situ
Optical microscopy
Refractories

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10.1016/j.jeurceramsoc.2010.01.034

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@article{08c789d05da24d65a0dcc8b1ff60b7c9,

title = "In situ microscopy observation of liquid flow, zirconia growth, and CO bubble formation during high temperature oxidation of zirconium diboride-silicon carbide",

abstract = "The oxidation of ZrB2-SiC composites at 1450-1650°C was directly observed with in situ optical microscopy. Video frames showed the flow of silicate liquids, the formation of zirconia deposits, and the growth and collapse of gaseous bubbles on the oxide surface. Contrast in the incandescence of in situ images is analyzed as spatial variations in hue and intensity and related to differences in emissivity of the oxide scale surface features by comparing these hot images with room temperature images. Above 1450°C, gaseous bubbles were observed to grow and collapse causing perturbations in the liquid oxide on the surface. The bubbles are associated with the evolution of CO from SiC oxidation and the onset is related to the critical temperature where the partial pressure of CO under the oxide scale exceeds atmospheric pressure.",

keywords = "Borides, Composites, In situ, Optical microscopy, Refractories",

author = "Sindhura Gangireddy and Karlsdottir, {Sigrun N.} and Norton, {S. J.} and Tucker, {J. C.} and Halloran, {John W.}",

note = "Funding Information: We thank the Office of Naval Research for funding this research under grant N00014-02-1-0034 .",

year = "2010",

month = aug,

doi = "10.1016/j.jeurceramsoc.2010.01.034",

language = "English",

volume = "30",

pages = "2365--2374",

journal = "Journal of the European Ceramic Society",

issn = "0955-2219",

publisher = "Elsevier BV",

number = "11",

}

In situ microscopy observation of liquid flow, zirconia growth, and CO bubble formation during high temperature oxidation of zirconium diboride-silicon carbide. / Gangireddy, Sindhura; Karlsdottir, Sigrun N.; Norton, S. J. et al.

In: Journal of the European Ceramic Society, Vol. 30, No. 11, 08.2010, p. 2365-2374.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - In situ microscopy observation of liquid flow, zirconia growth, and CO bubble formation during high temperature oxidation of zirconium diboride-silicon carbide

AU - Gangireddy, Sindhura

AU - Karlsdottir, Sigrun N.

AU - Norton, S. J.

AU - Tucker, J. C.

AU - Halloran, John W.

N1 - Funding Information: We thank the Office of Naval Research for funding this research under grant N00014-02-1-0034 .

PY - 2010/8

Y1 - 2010/8

N2 - The oxidation of ZrB2-SiC composites at 1450-1650°C was directly observed with in situ optical microscopy. Video frames showed the flow of silicate liquids, the formation of zirconia deposits, and the growth and collapse of gaseous bubbles on the oxide surface. Contrast in the incandescence of in situ images is analyzed as spatial variations in hue and intensity and related to differences in emissivity of the oxide scale surface features by comparing these hot images with room temperature images. Above 1450°C, gaseous bubbles were observed to grow and collapse causing perturbations in the liquid oxide on the surface. The bubbles are associated with the evolution of CO from SiC oxidation and the onset is related to the critical temperature where the partial pressure of CO under the oxide scale exceeds atmospheric pressure.

AB - The oxidation of ZrB2-SiC composites at 1450-1650°C was directly observed with in situ optical microscopy. Video frames showed the flow of silicate liquids, the formation of zirconia deposits, and the growth and collapse of gaseous bubbles on the oxide surface. Contrast in the incandescence of in situ images is analyzed as spatial variations in hue and intensity and related to differences in emissivity of the oxide scale surface features by comparing these hot images with room temperature images. Above 1450°C, gaseous bubbles were observed to grow and collapse causing perturbations in the liquid oxide on the surface. The bubbles are associated with the evolution of CO from SiC oxidation and the onset is related to the critical temperature where the partial pressure of CO under the oxide scale exceeds atmospheric pressure.

KW - Borides

KW - Composites

KW - In situ

KW - Optical microscopy

KW - Refractories

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U2 - 10.1016/j.jeurceramsoc.2010.01.034

DO - 10.1016/j.jeurceramsoc.2010.01.034

M3 - Article

AN - SCOPUS:77953542256

SN - 0955-2219

VL - 30

SP - 2365

EP - 2374

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 11

ER -

In situ microscopy observation of liquid flow, zirconia growth, and CO bubble formation during high temperature oxidation of zirconium diboride-silicon carbide

Abstract

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