Mechanical spectroscopy connected to creep and stress relaxation in a high resistant silicon nitride

Testu, S.; Schaller, R.; Besson, Jean‐Louis; Rouxel, Tanguy; Bernard‐Granger, Guillaume

doi:10.1016/s0955-2219(02)00109-7

Cited by 3 publications

(8 citation statements)

References 24 publications

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“…From the microscopic point of view, the chemical composition of the glass can change the position of the peak due to different viscosity. Results of Roebben et al , 29 Testu et al , 14,15 and Lakki et al 25,50 are in agreement with this hypothesis. For the samples measured in the present work (Table II), the peak temperature for all samples is very close, which means that the chemical composition of the glass is similar.…”

Section: Discussionsupporting

confidence: 54%

“…Therefore, the peak height of Ca 4 N is higher than Ca 2 N. Ca 8 N has a higher restoring force in comparison with Ca 4 N, due to a coarser microstructure (elongated grains), but it seems that the effect of a large quantity of glassy phase would be predominant. Testu et al 14 have reported a similar effect for pressure gas-sintered SiAlONs. According to their report, the intensity of the mechanical loss peak for nonannealed, 2, and 4 h annealed (followed by rapid cooling) samples at 1873 K were found to be 0.76 Â 10 À3 , 6.02 Â 10 À3 , and 22.1 Â 10 À3 , respectively.…”

Section: (3) Analysis Of Two-phase Sialon (Polycrystalline Sialon Andmentioning

confidence: 65%

“…For the recrystallized samples, there are no glass pockets, and ''f'' is equal to zero in Eq. (14). In this case, the dashpot of pocket viscosity (Z gp ) and the related parallel spring (k 1 ) should be removed.…”

Section: (3) Analysis Of Two-phase Sialon (Polycrystalline Sialon Andmentioning

confidence: 99%

“… the reduction in the amount of glassy phase. For instance, through gas pressure sintering, Testu et al 14,15 have decreased the volume percentage of glassy phase and consequently increased the creep resistance; the enhancement of glass mechanical properties by replacing oxygen with nitrogen in the composition of glassy phase 16–19 . Because the substitution of oxygen by nitrogen in the silica tetrahedral network results in a higher bonding density per unit volume of the glass, the nitrogen‐rich glassy phase sintered Si 3 N 4 ‐based ceramics demonstrated improved high‐temperature mechanical properties 16 .…”

Section: Introductionmentioning

confidence: 99%

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High-Temperature Mechanical Spectroscopy of Nitrogen-Rich Ca-α-SiAlON Ceramics

Mazaheri

Mari

Schaller

et al. 2011

Journal of the American Ceramic Society

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Nitrogen‐rich Ca–α‐SiAlON ceramics made with different starting powder compositions have been studied by high‐temperature mechanical spectroscopy in parallel with compressive deformation in a spark plasma sintering equipment. The mechanical loss spectra measured upon heating show a relaxation peak at about 1150 K and a high‐temperature exponential background at higher temperatures (>1400 K), which are attributed to the α‐relaxation in the glassy phase and to grain‐boundary sliding, respectively. A theoretical interpretation of the results shows that the peak position is mainly a function of glass viscosity. The amplitude of the peak is not only affected by the glassy phase quantity but also depends on the restoring force due to grain elasticity. Therefore, despite a higher amount of glassy phase specimens containing elongated grains may show a lower peak. The amplitude of the internal friction peak corresponding to α‐relaxation can be used to predict the compression creep of silicon‐nitride‐based ceramics.

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Section: Discussionsupporting

confidence: 54%

Section: (3) Analysis Of Two-phase Sialon (Polycrystalline Sialon Andmentioning

confidence: 65%

Section: (3) Analysis Of Two-phase Sialon (Polycrystalline Sialon Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-Temperature Mechanical Spectroscopy of Nitrogen-Rich Ca-α-SiAlON Ceramics

Mazaheri

Mari

Schaller

et al. 2011

Journal of the American Ceramic Society

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“…21 Pezzotti et al suggested that origin of a internal friction peak was anelastic diffusion of grain boundary, and viscoelastic nature was a origin of background and creep plastic strain.…”

Section: 6mentioning

confidence: 99%

Improving Heat Resistance of Silicon Nitride Ceramics with Rare-Earth Silicon Oxynitride

Nishimura

Guo

Hirosaki

et al. 2006

J. Ceram. Soc. Japan

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Effects of Carbon Nanotubes on Grain Boundary Sliding in Zirconia Polycrystals

et al. 2005

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Mechanical properties of zirconia polycrystals decrease drastically at high temperature. This is due to thermally activated grain boundary (GB) sliding which leads to plastic or even super-plastic deformation. [1±5] As GB sliding is a source of energy dissipation in the material, mechanical loss measurements [6,7] are well suited to study such a mechanism. They reveal, in general, a mechanical loss peak, which evolves into an exponential increase at higher temperatures. [8±11] When intergranular glassy films or/and amorphous pockets are presented in polycrystalline ceramics, the mechanical loss [12,13] and creep rate are higher. [5,14,15] We show that introducing carbon nanotubes (CNTs) in zirconia, in particular, drastically reduces GB sliding and consequently the mechanical loss at high temperatures. The nanotubes were observed at the grain boundaries by high-resolution transmission electron microscopy (HRTEM) and were related to the reduction of superplastic flow through the boundaries, which should improve the material creep resistance.The mechanical loss, tan(u), spectrum associated with the brittle±ductile transition in fully tetragonal zirconia polycrystals stabilized by 3 mol-% yttria (3Y-TZP) is presented in Figure 1. As measured as a function of temperature, the mechanical loss angle tan(u) shows an exponential increase accompanied by a steep shear modulus (G) decrease above 1200 K.High-temperature plastic deformation of polycrystalline zirconia is associated with GB sliding, and consequently it seems reasonable to link the mechanical loss spectrum with COMMUNICATIONS 88

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Mechanical spectroscopy connected to creep and stress relaxation in a high resistant silicon nitride

Cited by 3 publications

References 24 publications

High-Temperature Mechanical Spectroscopy of Nitrogen-Rich Ca-α-SiAlON Ceramics

High-Temperature Mechanical Spectroscopy of Nitrogen-Rich Ca-α-SiAlON Ceramics

Improving Heat Resistance of Silicon Nitride Ceramics with Rare-Earth Silicon Oxynitride

Effects of Carbon Nanotubes on Grain Boundary Sliding in Zirconia Polycrystals

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