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Microstructure and Fracture Mechanism Investigation of Porous Silicon Nitride–Zirconia–Graphene Composite Using Multi-Scale and In-Situ Microscopy.

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Title: Microstructure and Fracture Mechanism Investigation of Porous Silicon Nitride–Zirconia–Graphene Composite Using Multi-Scale and In-Situ Microscopy.
Authors: Liao, Zhongquan1 (AUTHOR) Yvonne.Standke@de.bosch.com, Standke, Yvonne1 (AUTHOR) juergen.gluch@ikts.fraunhofer.de, Gluch, Jürgen1 (AUTHOR) onkar_pathak@ymail.com, Balázsi, Katalin2 (AUTHOR) balazsi.katalin@ek-cer.hu, Pathak, Onkar1 (AUTHOR) ehrenfried.zschech@ikts.fraunhofer.de, Höhn, Sören3 (AUTHOR) soeren.hoehn@ikts.fraunhofer.de, Herrmann, Mathias3 (AUTHOR) mathias.herrmann@ikts.fraunhofer.de, Werner, Stephan4 (AUTHOR) stephan.werner@helmholtz-berlin.de, Dusza, Ján5 (AUTHOR) duszaj@yahoo.com, Balázsi, Csaba2 (AUTHOR) balazsi.csaba@ek-cer.hu, Zschech, Ehrenfried1 (AUTHOR), Anasori, Babak (AUTHOR)
Source: Nanomaterials (2079-4991). Feb2021, Vol. 11 Issue 2, p285-285. 1p.
Subjects: Silicon nitride, Porous silicon, Microstructure, Microscopy, Transmission electron microscopy, Phase transitions
Abstract: Silicon nitride–zirconia–graphene composites with high graphene content (5 wt.% and 30 wt.%) were sintered by gas pressure sintering (GPS). The effect of the multilayer graphene (MLG) content on microstructure and fracture mechanism is investigated by multi-scale and in-situ microscopy. Multi-scale microscopy confirms that the phases disperse evenly in the microstructure without obvious agglomeration. The MLG flakes well dispersed between ceramic matrix grains slow down the phase transformation from α to β-Si3N4, subsequent needle-like growth of β-Si3N4 rods and the densification due to the reduction in sintering additives particularly in the case with 30 wt.% MLG. The size distribution of Si3N4 phase shifts towards a larger size range with the increase in graphene content from 5 to 30 wt.%, while a higher graphene content (30 wt.%) hinders the growth of the ZrO2 phase. The composite with 30 wt.% MLG has a porosity of 47%, the one with 5 wt.% exhibits a porosity of approximately 30%. Both Si3N4/MLG composites show potential resistance to contact or indentation damage. Crack initiation and propagation, densification of the porous microstructure, and shift of ceramic phases are observed using in-situ transmission electron microscopy. The crack propagates through the ceramic/MLG interface and through both the ceramic and the non-ceramic components in the composite with low graphene content. However, the crack prefers to bypass ceramic phases in the composite with 30 wt.% MLG. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Microstructure and Fracture Mechanism Investigation of Porous Silicon Nitride–Zirconia–Graphene Composite Using Multi-Scale and In-Situ Microscopy.
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  Data: <searchLink fieldCode="AR" term="%22Liao%2C+Zhongquan%22">Liao, Zhongquan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Yvonne.Standke@de.bosch.com</i><br /><searchLink fieldCode="AR" term="%22Standke%2C+Yvonne%22">Standke, Yvonne</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> juergen.gluch@ikts.fraunhofer.de</i><br /><searchLink fieldCode="AR" term="%22Gluch%2C+Jürgen%22">Gluch, Jürgen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> onkar_pathak@ymail.com</i><br /><searchLink fieldCode="AR" term="%22Balázsi%2C+Katalin%22">Balázsi, Katalin</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> balazsi.katalin@ek-cer.hu</i><br /><searchLink fieldCode="AR" term="%22Pathak%2C+Onkar%22">Pathak, Onkar</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ehrenfried.zschech@ikts.fraunhofer.de</i><br /><searchLink fieldCode="AR" term="%22Höhn%2C+Sören%22">Höhn, Sören</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> soeren.hoehn@ikts.fraunhofer.de</i><br /><searchLink fieldCode="AR" term="%22Herrmann%2C+Mathias%22">Herrmann, Mathias</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> mathias.herrmann@ikts.fraunhofer.de</i><br /><searchLink fieldCode="AR" term="%22Werner%2C+Stephan%22">Werner, Stephan</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> stephan.werner@helmholtz-berlin.de</i><br /><searchLink fieldCode="AR" term="%22Dusza%2C+Ján%22">Dusza, Ján</searchLink><relatesTo>5</relatesTo> (AUTHOR)<i> duszaj@yahoo.com</i><br /><searchLink fieldCode="AR" term="%22Balázsi%2C+Csaba%22">Balázsi, Csaba</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> balazsi.csaba@ek-cer.hu</i><br /><searchLink fieldCode="AR" term="%22Zschech%2C+Ehrenfried%22">Zschech, Ehrenfried</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Anasori%2C+Babak%22">Anasori, Babak</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Feb2021, Vol. 11 Issue 2, p285-285. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Silicon+nitride%22">Silicon nitride</searchLink><br /><searchLink fieldCode="DE" term="%22Porous+silicon%22">Porous silicon</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Microscopy%22">Microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Silicon nitride–zirconia–graphene composites with high graphene content (5 wt.% and 30 wt.%) were sintered by gas pressure sintering (GPS). The effect of the multilayer graphene (MLG) content on microstructure and fracture mechanism is investigated by multi-scale and in-situ microscopy. Multi-scale microscopy confirms that the phases disperse evenly in the microstructure without obvious agglomeration. The MLG flakes well dispersed between ceramic matrix grains slow down the phase transformation from α to β-Si3N4, subsequent needle-like growth of β-Si3N4 rods and the densification due to the reduction in sintering additives particularly in the case with 30 wt.% MLG. The size distribution of Si3N4 phase shifts towards a larger size range with the increase in graphene content from 5 to 30 wt.%, while a higher graphene content (30 wt.%) hinders the growth of the ZrO2 phase. The composite with 30 wt.% MLG has a porosity of 47%, the one with 5 wt.% exhibits a porosity of approximately 30%. Both Si3N4/MLG composites show potential resistance to contact or indentation damage. Crack initiation and propagation, densification of the porous microstructure, and shift of ceramic phases are observed using in-situ transmission electron microscopy. The crack propagates through the ceramic/MLG interface and through both the ceramic and the non-ceramic components in the composite with low graphene content. However, the crack prefers to bypass ceramic phases in the composite with 30 wt.% MLG. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano11020285
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        Text: English
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      – SubjectFull: Porous silicon
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      – SubjectFull: Microstructure
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