Effect of chemical composition of intergranular glass on superplastic compressive deformation of β-silicon nitride

Narimatsu, Eiichirou; Shinoda, Yutaka; Akatsu, Takashi; Wakai, Fumihiro

doi:10.1016/j.jeurceramsoc.2004.11.016

Cited by 10 publications

(7 citation statements)

References 22 publications

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“…The weight loss increased, and the oxygen content decreased with strain. These related results are caused by the evaporation of the intergranular glassy phase during deformation . Even small amount of CaO addition decreased the weight loss and increased the oxygen content during deformation.…”

Section: Resultsmentioning

confidence: 98%

“…These related results are caused by the evaporation of the intergranular glassy phase during deformation. 19 Even small amount of CaO addition decreased the weight loss and increased the oxygen content during deformation. These results agree with the SEM observation of microstructure, which shows there is more residual glassy phase in SNCa samples after deformation.…”

Section: Microstructural Developmentmentioning

confidence: 99%

See 1 more Smart Citation

Effect of CaO Addition on Compressive Deformation of Silicon Nitride Ceramic with Y‐Mg‐Si‐O‐N Glassy System

Wananuruksawong

Shinoda

Akatsu

et al. 2013

Int J Applied Ceramic Tech

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additive) was studied by compression tests between 1500 and 1700°C. We studied the effect of CaO additive on flow stress, microstructural evolutions, and thermal stability of the intergranular glass phase during deformation. While the addition of CaO did not affect grain size, the flow stress decreased with the amount of CaO. This result suggested that the addition of CaO reduced the viscosity of intergranular glass phase. The addition of CaO further improved the thermal stability of the glass phase by suppressing the evaporation at elevated temperatures.

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Section: Resultsmentioning

confidence: 98%

Section: Microstructural Developmentmentioning

confidence: 99%

Effect of CaO Addition on Compressive Deformation of Silicon Nitride Ceramic with Y‐Mg‐Si‐O‐N Glassy System

Wananuruksawong

Shinoda

Akatsu

et al. 2013

Int J Applied Ceramic Tech

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“…Therefore, the viscosity of the intergranular glassy phase may not be proportional to that of bulk glass. Narimatsu et al . reported that the flow stress of Si 3 N 4 was not proportional to the viscosity of Y 2 O 3 –Al 2 O 3 –SiO 2 bulk glass exactly.…”

Section: Discussionmentioning

confidence: 99%

“…The grain size refinement and also the control of the chemistry of intergranular glassy phase are effective to improve superplastic properties. Narimatsu et al . studied the effect of chemical composition of Y 2 O 3 –Al 2 O 3 –SiO 2 ‐based intergranular glass on deformation of β‐Si 3 N 4 .…”

Section: Introductionmentioning

confidence: 99%

Evolution of Microstructure and Intergranular Glass Chemistry in Plastically Deformed Nanocrystalline Si₃N₄ Ceramics

et al. 2014

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Nanograined Si3N4 ceramics with Y2O3–Al2O3–MgO as sintering additive exhibited superplastic elongation of >300% at 1923 K with an initial strain rate of 5 × 10−4 s−1. Flow stress was less than 4 MPa up to elongation of 130%. In the later stage of deformation, the flow stress increased with strain due to the grain growth and the alignment of elongated grains. The volume fraction of glassy phase significantly reduced due to vaporization of glassy phase. The chemical analysis by TEM/EDS revealed that the chemical composition of the near Si3N4 grain surface was different from that of the interior of the glass pocket at multigrain junctions due to absorption of additive cations on the Si3N4 grain. The chemistry of intergranular glassy phase changed significantly in the later stage of deformation accompanying the microstructural evolution. It is suggested that the flow stress, which depends on the viscosity of intergranular glassy phase, varies with the change in glass chemistry during deformation.

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“…This means that asilicon nitride is completely transformed into b-silicon nitride. Formation of Si 2 N 2 O indicates two reaction possibilities [62][63][64][65][66][67][68][69][70][71][72]. First, capturing the oxygen from zirconia and reaction with silicon nitride.…”

Section: Characterizationmentioning

confidence: 99%

Investigation of the effect of ZrO2 and ZrO2/Al2O3 additions on the hot-pressing and properties of equimolecular mixtures of α- and β-Si3N4

Ewais

Attia

Abousree-Hegazy

et al. 2010

Ceramics International

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Effect of chemical composition of intergranular glass on superplastic compressive deformation of β-silicon nitride

Cited by 10 publications

References 22 publications

Effect of CaO Addition on Compressive Deformation of Silicon Nitride Ceramic with Y‐Mg‐Si‐O‐N Glassy System

Effect of CaO Addition on Compressive Deformation of Silicon Nitride Ceramic with Y‐Mg‐Si‐O‐N Glassy System

Evolution of Microstructure and Intergranular Glass Chemistry in Plastically Deformed Nanocrystalline Si₃N₄ Ceramics

Investigation of the effect of ZrO2 and ZrO2/Al2O3 additions on the hot-pressing and properties of equimolecular mixtures of α- and β-Si3N4

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Effect of chemical composition of intergranular glass on superplastic compressive deformation of β-silicon nitride

Cited by 10 publications

References 22 publications

Effect of CaO Addition on Compressive Deformation of Silicon Nitride Ceramic with Y‐Mg‐Si‐O‐N Glassy System

Effect of CaO Addition on Compressive Deformation of Silicon Nitride Ceramic with Y‐Mg‐Si‐O‐N Glassy System

Evolution of Microstructure and Intergranular Glass Chemistry in Plastically Deformed Nanocrystalline Si3N4 Ceramics

Investigation of the effect of ZrO2 and ZrO2/Al2O3 additions on the hot-pressing and properties of equimolecular mixtures of α- and β-Si3N4

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Evolution of Microstructure and Intergranular Glass Chemistry in Plastically Deformed Nanocrystalline Si₃N₄ Ceramics