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Small-scale deformation of pulsed electric current sintered silicon oxycarbide polymer derived ceramics
Ravindran Sujith, Nedunchezhian Srinivasan,
Published in
2013
Volume: 15
   
Issue: 11
Pages: 1040 - 1045
Abstract
The deformation behavior of pulsed electric current sintered silicon oxycarbide ceramics produced by the solid-state thermolysis of polyhydridomethylsiloxane at small-scale is investigated. The ceramics remained X-ray amorphous after sintering at 1300 °C in vacuum and a high density of ≈2.35 g cm-3 is achieved. The elastic constants of these ceramics are determined using non-destructive ultrasonic testing method. The elasto-plastic deformation under contact loading is determined using depth sensing nanoindentation technique. An indentation hardness of ≈11 GPa and reduced elastic modulus of ≈105 GPa is observed. The load-displacement curves display significant elastic recovery with an elastic work ratio of ≈0.71. The evolution of Hertzian cone cracks upon microindentation indicates an anomalous deformation behavior. Small-scale deformation behavior of pulsed electric current sintered silicon oxycarbide ceramics is investigated. The ceramics remained X-ray amorphous after sintering at 1300 °C in vacuum and a high density of ≈2.35 g cm-3 is achieved. An indentation hardness of ≈11 GPa and reduced elastic modulus of ≈105 GPa is observed. The load-displacement curves display significant elastic recovery with an elastic work ratio of ≈0.71. The evolution of Hertzian cone cracks upon microindentation indicates an anomalous deformation behavior. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
About the journal
JournalAdvanced Engineering Materials
ISSN14381656
Open AccessNo
Concepts (20)
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    DEPTH-SENSING NANOINDENTATION
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    Elastoplastic deformation
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    LOAD-DISPLACEMENT CURVE
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    POLYMER-DERIVED CERAMICS
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    PULSED ELECTRIC CURRENT
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    REDUCED ELASTIC MODULUS
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    SILICON OXYCARBIDE CERAMICS
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    ULTRASONIC TESTING METHOD
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    Cracks
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    Deformation
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    Elastic moduli
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    ELASTICITY
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    Hardness
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    Loading
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    Silicon
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    Sintering
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    Testing
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    Ultrasonic testing
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    Vacuum
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    Ceramic materials