The Spark Plasma Sintering of Silicon Carbide Ceramics Using Alumina

Unlu, Mehtap Deniz; Göller, Gültekin; Yücel, Onuralp; Şahin, Filiz Çınar

doi:10.12693/aphyspola.125.257

Cited by 18 publications

(5 citation statements)

References 7 publications

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“…Accordingly, the average theoretical thermal mismatch stresses in the α-Al 2 O 3 nanoparticles are calculated to be 417. 19 MPa by Equation ( 9). The theoretical tensile stresses in the α-Al 2 O 3 nanoparticles are slightly higher than the experimental value, which could be related to the fact that the amorphous products of the pyrolysis of PCS and the carbon fibers have not been considered in Equation ( 9).…”

Section: Discussionmentioning

confidence: 99%

“…Density is the one of the most important factors [18] and in general, high density corresponds to high mechanical properties. Alpha-alumina (α-Al 2 O 3 ) is a popular sintering additive for fabricating liquid phase sintered SiC ceramics [19,20]. The use of α-Al 2 O 3 is supposed to promote the densification of SiC and thus result in higher fracture toughness compared with solid phase sintered SiC.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Unidirectional, Laminated Cf/SiC Composites with α-Al2O3 Nanoparticles as Filler

et al. 2022

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The effects of an α-Al2O3 nanoparticle filler in the SiC matrix on the mechanical properties and failure mechanism of the unidirectional, laminated carbon fiber-reinforced SiC composites were investigated in this work. First, α-Al2O3 nanoparticles were added to the carbon fiber bundles using a slurry impregnation method, and then the Cf/SiC composite with an α-Al2O3 nanoparticle filler (Cf/SiC-Al2O3) was fabricated using a precursor infiltration and pyrolysis method. The microstructure of the Cf/SiC-Al2O3 composite showed chemical compatibility between the α-Al2O3 and the pyrolysis SiC. The Cf/SiC-Al2O3 composite with a low porosity of ~6.67% achieved a good flexural strength of 629.3 MPa and a good fracture toughness of 25.2 MPa·m1/2. The interlaminar shear strength of the Cf/SiC-Al2O3 composite was 11.7 MPa. The SiC-Al2O3 matrix also presented a considerable Young’s modulus of 138.2 ± 8.66 GPa and hardness of 10.3 ± 1.03 GPa. Further analysis indicated that the good mechanical properties with the addition of an α-Al2O3 filler were not only related to the dense matrix and the improvement of the mechanical properties of the matrix. They also originated from the thermal residual compressive stress in the SiC matrix close to the α-Al2O3 nanoparticles caused by the thermal expansion mismatch, which could reflect and close the cracks in the matrix. The findings of this study provide more methods for designing new composites exhibiting a good performance.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Unidirectional, Laminated Cf/SiC Composites with α-Al2O3 Nanoparticles as Filler

et al. 2022

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“…Higher densification was achieved at 1650 °C and 35 MPa, but a further increase in temperature to 1750 °C did not lead to a change in densification, though the microstructural analysis showed significant grain growth and a loss of nanostructures (grain size >100 nm). Spark plasma sintering of Al 2 O 3 –SiC nanopowders is reported in several papers [81,86,90,92,118,119,120,121] for different sintering temperatures, dwelling periods, heating rates and applied pressure. Borrell et al [86] consolidated Al 2 O 3 -17 vol% SiC nanopowders by SPS by inserting a composite powder mixture into a graphite die 20 mm in diameter and then applying uniaxial cold pressure at 30 MPa.…”

Section: Processing Of Sic–carbon Nanotube (Cnt)/alumina Nanocompomentioning

confidence: 99%

Recent Advances in the Processing and Properties of Alumina–CNT/SiC Nanocomposites

2019

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An alumina-based nanocomposite is fabricated through the addition of secondary nanophase material to an alumina matrix to alter and tailor the properties of alumina. The addition to alumina of semi-conductive materials, such as silicon carbide (SiC), and high conductive materials, such as carbon nanotubes with a characteristic size in the nanometer range, can alter the mechanical strength, hardness, toughness, and electrical and thermal properties of alumina. This paper discusses recent advances in the synthesis of alumina–SiC and alumina-carbon nanotube (CNT) nanopowders and their consolidation using conventional and non-conventional techniques. Mechanical (hardness, fracture toughness and flexural strength) and functional (thermal and electrical) properties are discussed. The influence of the microstructure on the properties of alumina–SiC and alumina–CNT nanocomposites is discussed. Furthermore, potential applications and current related research trends are described.

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“…Another way to obtain SiC with high density at relatively low temperature is the addition of sintering aids such as oxide, boron and/or carbon-based materials [24][25][26][27][28][29][30][31][32][33][34][35]. If, oxide-sintering aids, such as alumina, zirconia and yttria are used, the liquid phase can be formed, which can lead to the enhancement of shrinkage and densification of SiC at relatively low temperature.…”

Section: Introductionmentioning

confidence: 99%

Effects of sintering conditions on the microstructure and mechanical properties of SiC prepared using powders recovered from kerf loss sludge

Cho

Shin

et al. 2018

Bull Mater Sci

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The effects of sintering conditions on the microstructure and mechanical properties of the sintered SiC prepared using the SiC powder recovered from the kerf loss sludge were investigated. The recovered SiC powders were consolidated by spark plasma sintering (SPS) and conventional sintering methods. The effects of sintering temperature, time and methods (SPS and conventional sintering) on the phase, grain size and density of SiC were systematically studied. The Vickers hardness of spark plasma-sintered (SPSed) samples was higher than that of conventional sintered samples due to small grain size. When holding time was increased from 10 to 30 min, the grain size and relative density of SPSed samples were also increased, which lead to the almost constant Vickers hardness by competing effects of grain size and relative density. When holding time was over 30 min, no appreciable change of the relative density and grain size were observed, which can lead to similar values of Vickers hardness. SPS process can be used to make SiC with high density and hardness at relatively low temperature compared with the conventional sintering process.

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The Spark Plasma Sintering of Silicon Carbide Ceramics Using Alumina

Cited by 18 publications

References 7 publications

Microstructure and Mechanical Properties of Unidirectional, Laminated Cf/SiC Composites with α-Al2O3 Nanoparticles as Filler

Microstructure and Mechanical Properties of Unidirectional, Laminated Cf/SiC Composites with α-Al2O3 Nanoparticles as Filler

Recent Advances in the Processing and Properties of Alumina–CNT/SiC Nanocomposites

Effects of sintering conditions on the microstructure and mechanical properties of SiC prepared using powders recovered from kerf loss sludge

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