Si3N4-SiCw composites as structural materials for cryogenic application

Wu, Weiwei; Gui, Jingya; Wei, Sai; Xue, Weimin; Xie, Zhipeng

doi:10.1016/j.jeurceramsoc.2016.04.019

Cited by 20 publications

(1 citation statement)

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“…Adding foreign phases is one of the common approaches to modify the mechanical properties of composites. The fracture toughness of Si 3 N 4 and Al 2 O 3 -based composites can be enhanced by SiC whiskers and graphene oxide. − However, unlike the metal-based composites that can experience the precipitation hardening strategy to enhance the fracture toughness and hardness synergistically by introducing hard yet deformable precipitates, it is very difficult to control the precipitation process in the ceramic-based composites due to the high microstructural stability of the ceramic phases. Therefore, it is a difficult task to control the dispersion of the foreign added phases in the ceramic-based composites.…”

Section: Introductionmentioning

confidence: 99%

Toughening Ceramic-Based Composites by Homogenizing the Lattice Strain at Phase Boundaries

Jiang

Chen

et al. 2023

ACS Appl. Mater. Interfaces

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Ceramic-based composites generally have low fracture toughness, and toughening these materials without sacrificing their hardness has been a big challenge. This study presents an approach for toughening ceramic-based composites by modulating the strain partition and stress distribution in phase-boundary regions. A new concept of homogenizing the lattice strain to achieve high fracture toughness in ceramic-based composites is proposed based on the collective lattice shear of martensitic phase transformation. The strategy was demonstrated by ZrO2-containing WC–Co ceramic–metal composites as a prototype. The crystal planes along the WC/ZrO2 martensitic transforming phase boundaries exhibited significantly larger and uniform lattice strains compared with conventional dislocation pile-up phase boundaries with highly localized lattice strains. The homogeneous strain and stress distributions across interfaces enabled the composite to have simultaneously high fracture toughness and hardness. The “homogenizing the lattice strain” strategy proposed in this work is applicable to a broad range of ceramic-based composites to achieve superior comprehensive mechanical properties.

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