Grain Size Dependency on the Creep Rate in Hot-Pressed Silicon Nitride

Yoon, Sangyoung; Kashimura, Hideaki; Akatsu, Takashi; Tanabe, Yasuhiro; Yasuda, Eiichi

doi:10.2109/jcersj.104.939

Cited by 7 publications

(9 citation statements)

References 2 publications

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“…In spite of these discrepancies, it is generally agreed that the steady‐state creep for silicon nitride (and silicon carbide) with a grain boundary glassy phase proceeds by a solution‐precipitation mechanism through the amorphous (liquid) grain boundary phase, which has been modeled by Raj 27 and by Wakai 28 . Grain‐size dependence p takes a value of about 1–3 50–52 . This means a strong dependence of creep rate on grain size: The creep rate is supposed to increase at least for 1–3 orders of magnitude with the grain size decrease from micron size (500–1000 nm or larger) as in most of the microcrystalline silicon nitride studies to nanometer size as in the nano–nano composites of the present study.…”

Section: Resultsmentioning

confidence: 99%

Highly Creep‐Resistant Silicon Nitride/Silicon Carbide Nano–Nano Composites

Wan

Duan

Gasch

et al. 2005

Journal of the American Ceramic Society

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A high creep resistance at specified temperature and compressive stress was obtained in this investigation in the silicon nitride/silicon carbide composite with a nano–nano structure (nanosized SiC and Si3N4 in dual‐phase mixture) by a novel synthesis method. Starting from an amorphous Si–C–N powder derived from pyrolysis of a liquid polymer precursor, nanocomposites with varied grain size were achieved. With yttria additive amount decreasing from 8 to 1 wt% and eventually to zero, the structure underwent a transition from micro‐nano (nano‐sized SiC included in sub‐micron Si3N4) to nano–nano type. Nanocrystalline silicon nitride/silicon carbide ceramic composite with 30–50 nm grain size was synthesized without using sintering additive.

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Section: Resultsmentioning

confidence: 99%

Highly Creep‐Resistant Silicon Nitride/Silicon Carbide Nano–Nano Composites

Wan

Duan

Gasch

et al. 2005

Journal of the American Ceramic Society

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“…Grain size has a limited effect on creep rate. Yoon et al 99 showed a minor increase in compressive creep rate with decreasing grain size, which is likely due to a reduction in the length of the diffusion path for dissolution-precipitation. Wiederhorn et al 100 reported that a factor of two increase in grain size had no effect on the creep rate of Yb-containing Si 3 N 4 .…”

Section: Creep In Si 3 N 4 and Sialonsmentioning

confidence: 99%

“…Grain size has a limited effect on creep rate. Yoon et al 99 . showed a minor increase in compressive creep rate with decreasing grain size, which is likely due to a reduction in the length of the diffusion path for dissolution–precipitation.…”

mentioning

confidence: 98%

Microstructure and Creep Behavior of Silicon Nitride and SiAlONs

Fox¹,

Hellmann²

2008

Int J Applied Ceramic Tech

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Microstructural evolution of silicon nitride (Si3N4) and SiAlON materials and its influence on creep resistance is reviewed. Grain size, grain morphology, and the ratio of α‐ to β‐phase grains play a part in resistance to creep. The glassy, intergranular phase typically has the strongest influence on creep. Creep data are usually obtained using uniaxial tensile or compressive tests, where creep in tension is controlled by cavitation and grain boundary sliding controls creep in compression. The impression creep methodology is also reviewed. An additional creep mechanism, dilation of the SiAlON grain structure, was found to be active in impression creep.

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“…In contrast to Akatsu et al , 24 Roebben and colleagues 13,32 have shown that the peak could be reversibly found upon heating and cooling cycles in hot‐pressed Si 3 N 4 with Al 2 O 3 +Y 2 O 3 +TiN as a sintering aid 13 . Doen et al , 33 Yoon et al , 31 and Sakaguchi 30 have also indicated the appearance of peak in Si 3 N 4 ‐based ceramics with yttria and alumina additives, through the first heating stage. However, annealing (for instance, at 1160°C in the results presented by Sakaguchi et al 34 ) has led to a dramatic decline in the peak amplitude.…”

Section: Introductionmentioning

confidence: 94%

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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Grain Size Dependency on the Creep Rate in Hot-Pressed Silicon Nitride

Cited by 7 publications

References 2 publications

Highly Creep‐Resistant Silicon Nitride/Silicon Carbide Nano–Nano Composites

Highly Creep‐Resistant Silicon Nitride/Silicon Carbide Nano–Nano Composites

Microstructure and Creep Behavior of Silicon Nitride and SiAlONs

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

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