Microstructure, mechanical properties and toughening mechanisms of graphene reinforced Al2O3-WC-TiC composite ceramic tool material

Wang, Xuchao; Zhao, Jun; Cui, Enzhao; Song, Shuai; Líu, Hao; Song, Weitian

doi:10.1016/j.ceramint.2019.02.087

Cited by 44 publications

(35 citation statements)

References 47 publications

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“…The sintering pressure was maintained at 32 MPa during the dwell process. In our previous report [ 5 ], we proved that the mechanical properties of graphene reinforced Al 2 O 3 –WC–TiC ceramic composites were optimal when the content of graphene was 0.5 vol%. Therefore, in this work, only two ceramic composites, named AWTG0.5 and AWTG0, were prepared and their compositions were shown in Table 1 .…”

Section: Methodsmentioning

confidence: 72%

“…Cheng et al [ 4 ] used graphene platelets (GPLs) to reinforce Al 2 O 3 /TiC ceramic composites, and they found that the optimal fracture toughness (8.7 ± 0.4 MPa·m 1/2 ) was obtained when the content of GPLs was 0.2 wt%, which increased by 67.3% compared to the Al 2 O 3 /TiC ceramic. Wang et al [ 5 ] fabricated Al 2 O 3 /WC/TiC/graphene ceramic composites, and they found that the optimal flexural strength and fracture toughness were 646.31 ± 20.78 MPa, 9.42 ± 0.40 MPa·m 1/2 , respectively, when the content of graphene was 0.5 vol%, which were significantly improved compared to the composite without graphene.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Interfacial Structure on Mechanical Properties of Graphene Reinforced Al2O3–WC Matrix Ceramic Composite

et al. 2021

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The interfacial structures and interfacial bonding characteristics between graphene and matrix in graphene-reinforced Al2O3–WC matrix ceramic composite prepared by two-step hot pressing sintering were systematically investigated. Three interfacial structures including graphene–Al2O3, graphene–Al2OC and graphene-WC were determined in the Al2O3–WC–TiC–graphene composite by TEM. The interfacial adhesion energy and interfacial shear strength were calculated by first principles, and it has been found that the interfacial adhesion energy and interfacial shear strength of the graphene–Al2OC interface (0.287 eV/nm2, 59.32 MPa) were far lower than those of graphene–Al2O3 (0.967 eV/nm2, 395.77 MPa) and graphene–WC (0.781 eV/nm2, 229.84 MPa) interfaces. Thus, the composite with the strong and weak hybrid interfaces was successfully obtained, which was further confirmed by the microstructural analysis. This interfacial structure could induce strengthening mechanisms such as load transfer, grain refinement, etc., and toughening mechanisms such as crack bridging, graphene pull-out, etc., which effectively improved mechanical properties.

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Section: Methodsmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Effect of Interfacial Structure on Mechanical Properties of Graphene Reinforced Al2O3–WC Matrix Ceramic Composite

et al. 2021

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“…In recent years, graphene toughened ceramic composite materials have been widely studied [ 13 , 14 ]. For example, Wang et al [ 15 ] added WC, TiC, and graphene into Al 2 O 3 matrix to obtain Al 2 O 3 /WC/TiC/graphene composite ceramic tool materials, whose optimal indentation fracture toughness, Vickers hardness, and flexural strength reached 9.42 MPa.m 0.5 , 24.64 GPa, and 646.31 MPa, respectively. Ahmad et al [ 16 ] used nano zirconia and graphene nano-sheets to toughen alumina ceramic composite, and it was reported that the fracture toughness increased by 155% and the microhardness increased by 17% compared with the monolithic alumina ceramic.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Characteristic Size and Content of Graphene on the Crack Propagation Path of Alumina/Graphene Composite Ceramics

Chen

Xiao

et al. 2021

Materials

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In this paper, the Voronoimosaic model and the cohesive element method were used to simulate crack propagation in the microstructure of alumina/graphene composite ceramic tool materials. The effects of graphene characteristic size and volume content on the crack propagation behavior of microstructure model of alumina/graphene composite ceramics under different interfacial bonding strength were studied. When the phase interface is weak, the average energy release rate is the highest as the short diameter of graphene is 10–50 nm and the long diameter is 1600–2000 nm. When the phase interface is strong, the average energy release rate is the highest as the short diameter of graphene is 50–100 nm and the long diameter is 800–1200 nm. When the volume content of graphene is 0.50 vol.%, the average energy release rate reaches the maximum. When the velocity load is 0.005 m s−1, the simulation result is convergent. It is proven that the simulation results are in good agreement with the experimental phenomena.

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“…Besides, the density improvement and grain refinement of graphene reinforcing Al 2 O 3 matrix composites were realized due to better thermal conductivity and pinning effect of the graphene that improved the carrying capacity of the composites. Additionally, various extrinsic toughening mechanisms induced by the weak bonding interfaces of graphene, such as graphene platelets pullout, crack deflection, crack bridging, and microcrack, greatly dissipated fracture energy and resulted in a significant improvement on mechanical properties . Thus, considering the ultrathin shape and exceptional properties of these 2D materials, a series of fibrous monolithic ceramics with Al 2 O 3 as fiber cells and rGO as the cell boundary phase were fabricated to obtain bamboo‐like architecture in this study.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, various extrinsic toughening mechanisms induced by the weak bonding interfaces of graphene, such as graphene platelets pullout, crack deflection, crack bridging, and microcrack, greatly dissipated fracture energy and resulted in a significant improvement on mechanical properties. 23,24 Thus, considering the ultrathin shape and exceptional properties of these 2D materials, a series of fibrous monolithic ceramics with Al 2 O 3 as fiber cells and rGO as the cell boundary phase were fabricated to obtain bamboo-like architecture in this study. The materials exhibit progressive non-brittle fracture characteristics.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired alumina/reduced graphene oxide fibrous monolithic ceramic and its fracture responses

Chen

Song

et al. 2020

J Am Ceram Soc

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Natural composites have very simple compositions and complex hierarchical architectures consisting of several different levels. These features simultaneously endow them with strength, toughness, functional adaptation, and damage‐healing characteristics. Inspired by the microstructural features of natural materials, this work successfully fabricated Al2O3/reduced graphene oxide (rGO) fibrous monolithic ceramics with bamboo‐like structures by introducing a thin graphene oxide around Al2O3 fiber cells to form the rGO boundary phase. The detailed evolutions of the crack extension and fracture responses were investigated by a J‐integral method, and these bamboo‐like composites demonstrated high structural reliability with excellent damage tolerance and progressive plastic failure behavior. With the fiber cell diameter of 0.6 mm, such composites exhibited fracture toughness (29.46 ± 3.04 MPa m1/2) and work of fracture (799 ± 127 J m−2) that were 475% and 1075% higher than those of the monolithic Al2O3 ceramic, respectively. Their excellent fracture‐resistant behavior was attributed to the hierarchical architectures that provide crack deflection, delamination, and load redistribution. The results also established the structure‐activity relationships to guide the design and fabrication of these bamboo‐like composites.

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Microstructure, mechanical properties and toughening mechanisms of graphene reinforced Al2O3-WC-TiC composite ceramic tool material

Cited by 44 publications

References 47 publications

Effect of Interfacial Structure on Mechanical Properties of Graphene Reinforced Al2O3–WC Matrix Ceramic Composite

Effect of Interfacial Structure on Mechanical Properties of Graphene Reinforced Al2O3–WC Matrix Ceramic Composite

Effect of the Characteristic Size and Content of Graphene on the Crack Propagation Path of Alumina/Graphene Composite Ceramics

Bioinspired alumina/reduced graphene oxide fibrous monolithic ceramic and its fracture responses

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