Effect of layer thickness ratio on microstructure and mechanical properties of TiCN-HfN/TiCN-WC laminated ceramics

Hu, Shiheng; Song, Jiancheng; Gao, Jiaojiao; Liu, Jia‐Bao; Meng, Weiqi; Wang, Yao

doi:10.1016/j.ceramint.2023.03.208

Cited by 4 publications

(1 citation statement)

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“…Nowadays, a breakthrough was developed by using the idea of bionics to combine the toughening mechanism of shells and the high‐speed cutting advantage of ceramic cutting tools 9–12 . Many reports were devoted to the investigation of mechanical properties of laminated ceramic cutting tools, such as fracture resistance, 13 work of fracture, 14 Vickers hardness, 15 friction characteristics, 16 and crack self‐healing 17,18 . Moreover, the influence of the micro‐mechanism of laminated ceramic cutting tools on the mechanical properties was focused on.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, microstructure, and mechanical properties of novel three‐layer structured bionic ceramic cutting tools

Li,

Huang,

Liu

et al. 2024

Int J Applied Ceramic Tech

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Ceramic cutting tools have low fracture toughness owing to brittleness. To improve the fracture toughness and flexural strength of ceramic cutting tools, the growth model of SiCw during the sintering process was established by the laminated structure and anisotropy of growth of bionic shells. Furthermore, a theoretical model of sintering parameters and total fracture toughness was achieved. Then, the dispersion process of SiCw was improved to enhance the homogeneity of the mixed powders further. Finally, a novel three‐layer structured bionic ceramic cutting tool was fabricated by hot‐pressing. The effects of sintering temperature, holding time, and sintering pressure on the mechanical properties and microstructure of bionic ceramic cutting tools were investigated. The results showed that the flexural strength (three point bending), fracture toughness (indentation method), and Vickers hardness of the three‐layer structured bionic ceramic cutting tool with excellent dispersed were 735 ± 34 MPa, 5.68 ± 0.06 MPa·m1/2, and 19.66 ± 0.12 GPa, respectively. The microstructure of the fracture revealed that the fracture mechanism of the bionic ceramic cutting tool was a mixture of intergranular fracture, transgranular fracture, whisker pull‐out, whisker fracture, forked crack, crack deflection, crack bridging, zig‐zag crack, and crack termination. The accuracy of the total fracture toughness model was reliable.

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