Spark plasma sintering of graphene reinforced silicon carbide ceramics

Bódis, Eszter; Cora, Ildikó; Balázsi, Csaba; Németh, Péter; Károly, Zoltán; Klébert, Szilvia; Fazekas, Péter; Keszler, Ágnes; Szépvölgyi, János

doi:10.1016/j.ceramint.2017.04.042

Cited by 44 publications

(15 citation statements)

References 41 publications

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“…FGMs can be prepared by various processes, such as deposition methods, infiltration, and tape and slip casting depending on the application area [1,4], but these processes consist of several steps. However, spark plasma sintering (SPS), a well-known powder metallurgy processing method, offers a promising approach to making FGMs in a single step [5,6], due to its unique heating method [7][8][9][10]; the modification of the spatial distribution of the effective current per unit area results in a temperature gradient within the sample [11]. This creates the possibility of (a) joining different types of materials into a single part [7]; (b) producing a monolithic sample with a dissimilar phase composition [12]; and more importantly with regard to the present paper (c) fabricating sintered bodies with controlled porosity.…”

Section: Introductionmentioning

confidence: 99%

“…However, spark plasma sintering (SPS), a well-known powder metallurgy processing method, offers a promising approach to making FGMs in a single step [5,6], due to its unique heating method [7][8][9][10]; the modification of the spatial distribution of the effective current per unit area results in a temperature gradient within the sample [11]. This creates the possibility of (a) joining different types of materials into a single part [7]; (b) producing a monolithic sample with a dissimilar phase composition [12]; and more importantly with regard to the present paper (c) fabricating sintered bodies with controlled porosity. In the latter case, the various parts of the sample exposed to different sintering temperatures acquire different degrees of porosity; i.e., a porosity-graded part can be formed [13].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of graded alumina by spark plasma sintering

Bódis

Károly

2021

Int J Adv Manuf Technol

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Functionally graded materials (FGMs) attract considerable interest in materials science and industry, since their composition or morphology gradually changes along their length, width, or height, which provides new approach for the development of multifunctional materials. In this paper, we studied the fabrication of a gradient microstructure in alumina (Al2O3) by spark plasma sintering (SPS). During the SPS process, the applied asymmetric graphite tool configuration causes a large temperature gradient, which results in a gradually changing morphology in Al2O3 ceramics. The local temperatures were quantitatively measured through extra thermocouples during SPS processes with various asymmetric configurations. In the most asymmetric configuration, a maximum vertical temperature difference of 225 °C was detected within the sample treated at a sintering temperature of 1300 °C and a pressure of 25 MPa applied 200 °C·min−1 heating rate. The microstructure investigations demonstrated the morphology gradient in the ceramic: one part of the Al2O3 exhibited fine, nanostructured morphology with large open and permeable pores, whereas the other part was solid without pores. Our investigations show that a gradient Al2O3 ceramic can be produced with a single-step SPS process, which offers new directions in FGMs research. With an asymmetric sintering configuration and the sintering conditions, the structure of the ceramic, such as porosity, can be designed according to the requirements of the application area.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of graded alumina by spark plasma sintering

Bódis

Károly

2021

Int J Adv Manuf Technol

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“…It is believed that graphene is uniformly distributed along the grain boundaries, restraining excessive grain growth [ 29 ]. Uniform distribution of graphene effectively improves the densification of ceramics due to its fine properties [ 30 , 31 , 32 ]. However, with the further increase of graphene content, the agglomeration phenomenon, which is detrimental to the mechanical properties, is clearly observed.…”

Section: Resultsmentioning

confidence: 99%

“…After the grinding, the materials were dried in a vacuum drying furnace, at 120 °C, for about 3 h. After we sieved it, the graphite mold was used to load the materials. The vacuum sintering furnace was used for HP, with a sintering temperature, pressure, and hold time of 1650 °C, 30 MPa, and 10 min, respectively. The brief experimental process of composite materials is shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

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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“…It has been determined that the mechanical properties of matrix materials have increased significantly with the addition of GPLs [7][8][9][10][11][12][13][14][15]. In a study [7] in which GPLs-SiC composites were produced with the SPS technique at different temperatures, it was observed that the fracture toughness of SiC improved by approximately 5-20 % with the addition of 1 wt % GPLs.…”

Section: Introductionmentioning

confidence: 99%

The Microstructure and Mechanical Properties of Silicon Carbide Containing Graphene Nanoplatelets Sonicated for Different Times

Başkut

2022

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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Graphene platelets (GPLs) are widely preferred as a second phase to improve the properties of advanced technology ceramics thanks to their excellent mechanical properties. However, their agglomeration tendency requires the application of dispersion processes before mixing with matrix powders. Sonication is the most commonly used technique for the dispersion of GPLs. In this study, the effects of adding GPLs prepared at different probe-sonication times such as 1, 2, 4 and 6 h on the microstructure and mechanical properties of spark plasma sintered (SPS) silicon carbide (SiC) were investigated. Scanning electron microscopy (SEM) examinations and size measurements revealed that the size of GPLs decreased with increasing sonication time. However, the reduction in the size of the GPLs was very low up to the 2 h sonication time and became more pronounced at the GPLs prepared at 4 and 6 h sonication times. Raman analyses indicated that dispersions of GPLs agglomerates increased as well as defects and/or disorders in their structures with increasing sonication time. However, the thickness of the well-dispersed GPLs obtained at the 2 h sonication time did not change when the sonication time was increased to 4 and 6 h. The highest increment in the fracture toughness of SiC matrix in both the throughplane (//) and in-plane ( ) directions was achieved with the addition of GPLs sonicated for 2 h among the GPLs prepared at different sonication times. The higher contribution of 2 h sonicated GPLs to fracture toughness than non-sonicated and 1 h sonicated GPLs was associated with their more homogeneous distribution in the matrix microstructure, while higher toughness values they provided compared to 4 and 6 h sonicated GPLs could be explained by the positive effect of their higher lateral size and aspect ratio. GPLs have improved the fracture toughness of SiC matrix with the help of bridging and deflection toughening mechanisms.

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Spark plasma sintering of graphene reinforced silicon carbide ceramics

Cited by 44 publications

References 41 publications

Fabrication of graded alumina by spark plasma sintering

Fabrication of graded alumina by spark plasma sintering

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

The Microstructure and Mechanical Properties of Silicon Carbide Containing Graphene Nanoplatelets Sonicated for Different Times

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