Tensile behaviour of gas pressure sintered silicon nitride in the 1600–1700°C temperature range

Testu, S.; Rouxel, Tanguy; Besson, Jean‐Louis

doi:10.1016/s1359-6454(01)00250-6

Cited by 10 publications

(4 citation statements)

References 28 publications

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“…As mentioned above, the highly alignment of the elongated grains along tensile direction were observed in the deformed sample. The texture development of elongated grains can be evaluated by the ratio of peak intensity from (210) plane and (101) plane, that is I (210) / I (101) , where (210) and (101) planes represent the parallel and perpendicular planes to the c‐axis of β‐Si 3 N 4 crystal, respectively . In case that the crystal orientation of the β‐Si 3 N 4 grains is random with no preferential orientation, the ratio I (210) / I (101) is estimated to be 0.94 (from JCPDS 33‐1160).…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

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

et al. 2014

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“…Por último, la evidencia de disminución del daño inducido por cavitación al aumentar la temperatura es un argumento adicional que siguiere que este fenómeno no está controlado por difusión. Estos resultados son consistentes con estudios previos en cerámicos de nitruro de silicio (5,15,16).…”

Section: Resultados Y Discusiónunclassified

Cavitación durante la fluencia de policristales de Si<sub>3</sub>N<sub>4</sub>

Martínez¹,

Gómez-Garcı́a²,

Melendo³

et al. 2005

Bol. Soc. Esp. Ceram. Vidr.

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Este trabajo está orientado a determinar las condiciones de tensión y temperatura para las cuales ocurre la nucleación y coalescencia de cavidades en dos materiales cerámicos a base de nitruro de silicio sinterizados bajo presión de gas. En particular, se indica que, aunque ambos materiales muestran significativos niveles de deformación estacionaria a tensiones menores que 90 MPa, a tensiones mayores las cavidades nuclean y coalescen, dando lugar a fluencia terciaria. Las observaciones microestructurales por microscopía electrónica de barrido sugieren que la cavitación está asociada al movimiento viscoso de la fase secundaria. Palabras clave: Cerámicos, nitruro de silicio, fluencia, evolución microestructural. Cavitation during creep of Si 3 N 4 polycrystalsThis work is oriented to put forth the stress and temperature conditions for the nucleation and coalescence of cavities in two gas pressure-sintered silicon nitride-based ceramic materials. Particularly, it is indicated that, even though both materials show significant steady-state strain levels at stresses lower than 90 MPa, cavities nucleate and coalesce at higher stresses, thus giving rise to tertiary creep. The microstructural observations by SEM suggest that cavitation is associated to the viscous movement of the secondary phase.

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“…A few works on tensile tests appeared in the literature on silicon nitride at high temperature. 9,10 While these studies were limited to macroscale samples, the experiments have problems in measuring the micro-/ nanoscale structural and fracture properties at high temperatures. As the dynamic microstructural changes may occur during the test, it is hard to measure these changes in mechanical test.…”

Section: Introductionmentioning

confidence: 99%

“…Related experimental work has been performed in studying the mechanical properties2 – 5 and phase transition6 – 8 of Si 3 N 4 . A few works on tensile tests appeared in the literature on silicon nitride at high temperature 9 9,10. While these studies were limited to macroscale samples, the experiments have problems in measuring the micro-/nanoscale structural and fracture properties at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics investigation of temperature dependent structural and fracture properties of amorphous silicon nitride

Liao

Wang

Zhang

2011

Materials Science and Technology

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Silicon nitride presents good mechanical properties and thermal stability at high temperature. As the experiments have limitations in the micro-/nanoscale characterisation of structural and fracture properties at high temperatures, atomistic simulation is the proper way to investigate the mechanism of this unique feature. In the present paper, the structural and fracture properties of amorphous silicon nitride (a-Si3N4) were studied at temperatures up to 1500 K. The simulation results consist of experiments on radial distribution function, temperature dependent yield stress and Young's modulus. Based on the structural and mechanical results of α-Si3N4 at different temperatures, the structure–property correlations were discussed.

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Tensile behaviour of gas pressure sintered silicon nitride in the 1600–1700°C temperature range

Cited by 10 publications

References 28 publications

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

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

Cavitación durante la fluencia de policristales de Si<sub>3</sub>N<sub>4</sub>

Molecular dynamics investigation of temperature dependent structural and fracture properties of amorphous silicon nitride

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Tensile behaviour of gas pressure sintered silicon nitride in the 1600–1700°C temperature range

Cited by 10 publications

References 28 publications

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

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

Cavitación durante la fluencia de policristales de Si<sub>3</sub>N<sub>4</sub>

Molecular dynamics investigation of temperature dependent structural and fracture properties of amorphous silicon nitride

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

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