Crack propagation in silicon nitride ceramics under various temperatures and grain boundary toughness

Wei, Sai; Porz, Lukas; Xie, Zhihui; Liu, Bin; Chen, Juan; Xue, Weimin; Zhao, Jing

doi:10.1016/j.msea.2015.02.061

Cited by 11 publications

(2 citation statements)

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“…One of the important targets of materials scientists is the development of nanocomposites with improved and novel functionalities. In particular, ceramic nanocomposites are being extensively utilized in applications involving high temperatures, primarily owing to their excellent superplasticity at low temperatures, together with high flexural strength, fracture toughness, and wear resistance . During the fabrication of ceramic nanocomposites, intragranular microstructures are often observed in the matrix.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, ceramic nanocomposites are being extensively utilized in applications involving high temperatures, primarily owing to their excellent superplasticity at low temperatures, together with high flexural strength, fracture toughness, and wear resistance. [1][2][3][4] During the fabrication of ceramic nanocomposites, intragranular microstructures are often observed in the matrix. The intragranular microstructure is a typical structural characteristic of ceramic nanocomposites that influences its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the intragranular microstructure in ceramic nanocomposites and their effect on the mechanical properties

Luo

Zhang

et al. 2018

J Am Ceram Soc

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The formation of intragranular microstructure in Al2O3/ZrO2 and Si2N2O/Si3N4 nanocomposites was analyzed, and the effect of intragranular microstructure on the mechanical properties of nanocomposites was investigated. Results suggest 3 requisite conditions for the formation of intragranular microstructure and the role of intracrystalline glass phase and scar microstructure. In case of Al2O3/ZrO2, the intragranular microstructure leads to the formation of transgranular fracture, which in turn improves the mechanical properties via strengthening and toughening. On the other hand, in case of Si3N4/Si2N2O nanocomposites, intragranular microstructure reduces the possibility of bridging, pulling out, and crack deflection, thereby leading to the deterioration of strength and toughness. Based on these results, we can conclude that the formation of intragranular microstructure does not necessarily improve the mechanical properties in all kinds of materials. Rather, the effect of intragranular microstructure on the mechanical properties of nanocomposites is related to the strengthening and toughing mechanism of matrix materials.

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Section: Introductionmentioning

confidence: 99%