Effects of sintering parameters on microstructure, graphene structure stability and mechanical properties of graphene reinforced Al2O3-based composite ceramic tool material

Wang, Xuchao; Zhao, Jun; Cui, Enzhao; Liu, Hao; Dong, Youhao; Sun, Zhefei

doi:10.1016/j.ceramint.2019.08.040

Cited by 34 publications

(18 citation statements)

References 35 publications

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“…Firstly, the composite powders were heated to 1750 °C at a heating rate of 40 °C/min without dwell, and then they were rapidly cooled to 1600 °C for 15 min dwell time; finally, they were cooled to the room temperature. It is important to point out that the 1600 °C dwell temperature is determined according to our previous report in literature [ 20 ], because the higher mechanical properties of Al 2 O 3 –WC matrix composite can be obtained in this dwell temperature. The sintering pressure was maintained at 32 MPa during the dwell process.…”

Section: Methodsmentioning

confidence: 99%

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: 99%

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

et al. 2021

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“…The incorporation of graphene nanoplatelets (GNPs) into ceramic matrix composites proved to increase the flexural strength and fracture toughness of these materials as they modify the interfacial contact between the different phases [19][20][21][22][23][24] . Due to its two-dimensional character, graphene also presents a great potential to improve the tribological behavior of carbon-based reinforced ceramics by decreasing the coefficient of friction (CoF) due to the formation of a thin GNP-rich lubricating tribofilm, formed by the exfoliation of graphene layers from GNPs embedded in the ceramic matrix [25][26][27][28][29][30][31] . ZengbinYin, et al (2018) [26] fabricated TiB2/TiC ceramic tool material with the addition of Ni and graphene nanoplatelets by spark plasma sintering.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and wear performance of alumina/graphene coating on textured Al2O3/TiC substrate composites

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Venturi

et al. 2021

Journal of the European Ceramic Society

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“…Porwal claimed that 0.8 vol% graphene was beneficial to promote the increase of transgranular fracture during the fracture process [12]. Wang [13] and Cui [14] discussed that graphene could induce strong and weak interfaces between the ceramic matrix, which was helpful for improving the ceramics' properties.…”

Section: Methodsmentioning

confidence: 99%

“…Figure 1b presents the wrinkled and curled 2D morphology of graphene, which are helpful in reinforcing matrix materials [23]. The large specific surface area could expand the crack area of ceramics, which is beneficial to improve the fracture toughness [13]. MgO (Tianjin North Tianyi Chemical Reagent Factory, Tianjin, China) and Y 2 O 3 (Shanghai Chaowei nanotechnology Co. Ltd., Shanghai, China) were used as sintering aids.…”

Section: Methodsmentioning

confidence: 99%

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Reinforcing Mechanisms of Graphene and Nano-TiC in Al2O3-Based Ceramic-Tool Materials

et al. 2020

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Graphene and nano-TiC, which have good reinforcing effects on Al2O3-based ceramic-tool materials, are generally used as additive phases for ceramics. In this study, nine kinds of samples were sintered, to investigate the effects of graphene and nano-TiC on the reinforcing mechanisms of Al2O3-based ceramics. The experimental results indicated that adding 0.5 vol% graphene and 10 vol% nano-TiC can obtain the optimum flexural strength, fracture toughness, and Vickers hardness, which were 705 ± 44 MPa, 7.4 ± 0.4 MPa m1/2, and 20.5 ± 0.8 GPa, respectively. Furthermore, the reinforcing mechanisms of crack bridging, pull-out of graphene, and pull-out of nano-TiC are identified, which are contributed to improving the mechanical properties of ceramics. Meanwhile, other reinforcing mechanisms induced by graphene (graphene break, crack guiding, and 3D propagation) and nano-TiC (crack branching, crack deflection, and peeling) are discussed. These reinforcing mechanisms are coupled together, while decoupling is hard to work out. Thus, further quantitative studies of reinforcing effects of graphene and nano-TiC on Al2O3-based ceramic-tool materials are necessary to be carried out.

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Effects of sintering parameters on microstructure, graphene structure stability and mechanical properties of graphene reinforced Al2O3-based composite ceramic tool material

Cited by 34 publications

References 35 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

Microstructure and wear performance of alumina/graphene coating on textured Al2O3/TiC substrate composites

Reinforcing Mechanisms of Graphene and Nano-TiC in Al2O3-Based Ceramic-Tool Materials

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