Growth of graphite particles in carbons/SiC/B4C composites

Ogawa, Ichitaro; Nishikubo, Keiko; Imamura, Takeshi

doi:10.1016/s0008-6223(99)00081-0

Cited by 8 publications

(4 citation statements)

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“…Silicon carbide (SiC) is widely used in the defense industry (bulletproof vests), turbine engines, nozzles, heat conducting tube, and aerospace applications [1][2][3][4][5][6][7]. Since SiC has remarkable properties such as low theoretical density (3.21 g/cm 3 ), a high hardness, a high elastic modulus, high thermal conductivity, good wear and oxidation resistance, and low coefficient of thermal expansion [2,3,[8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Addition and Mixture Method on the Microstructure and Mechanical Properties of Silicon Carbide

Yaşar

Haber

2020

Materials

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High dense (>99% density) SiC ceramics were produced with addition of C and B4C by spark plasma sintering method at 1950 °C under 50 MPa applied pressure for 5 min. To remove the oxygen from the SiC, it was essential to add C. Two different mixture method were used, dry mixing (specktromill) and wet mixing (ball milling). The effect of different levels of carbon additive and mixture method on density, microstructure, elastic modulus, polytype of SiC, Vickers hardness, and fracture toughness were examined. Precisely, 1.5 wt.% C addition was sufficient to remove oxide layer from SiC and improve the properties of dense SiC ceramics. The highest hardness and elastic modulus values were 27.96 and 450 GPa, respectively. Results showed that the 4H polytype caused large elongated grains, while the 6H polytype caused small coaxial grains. It has been observed that it was important to remove oxygen to achieve high density and improve properties of SiC. Other key factor was to include sufficient amount of carbon to remove oxide layer. The results showed that excess carbon prevented to achieve high density with high elastic modulus and hardness.

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Section: Introductionmentioning

confidence: 99%

Effect of Carbon Addition and Mixture Method on the Microstructure and Mechanical Properties of Silicon Carbide

Yaşar

Haber

2020

Materials

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“…Dense SiC ceramics can be used in many applications since it has a low density (3.21 g/cm 3 ), a low coefficient of thermal expansion, high thermal conductivity, high melting point, high hardness, high wear resistance and high elastic modulus [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The influence of carbon source and content on structure and mechanical properties of sic processed via spark plasma sintering method

Yaşar

DeLucca

Haber

2022

PAC

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The effects of carbon sources and carbon content on the density, microstructure, hardness and elastic properties of dense SiC ceramics were investigated. The precursor powders were prepared by adding 1.5-4.5wt.% C (carbon lamp black or phenolic resin) and 0.5 wt.% B4C to SiC and sintered at 1900?C for 15min under 50MPa pressure in argon with an intermediate dwell at 1400?C for 30min. The results showed that carbon lamp black provided better mixing than phenolic resin since carbon cluster was found in the samples made with phenolic resin. Increasing carbon content causes the decrease of 4H polytype amount in the samples. The presence of higher than 1.5wt.% carbon inhibits grain growth and the presence of the 4H polytype. SiC samples can be produced with relative density of more than 99%TD with 1.5wt.% carbon lamp black addition which shows small average grain size, high elastic modulus and hardness of 2.28 ?m, 453GPa and 21.2GPa, respectively.

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“…Carbon materials, however, are claimed to have certain disadvantages such as low mechanical strength and low degree of oxidation resistance at high temperature. The fabrication of carbon-ceramic composites seems to be an adequate way to obtain materials with better mechanical properties and oxidation resistance [1][2][3][4], but usually their mass production is expensive [1]. One of the main problems of the process is the low sinterability of the carbon source with most refractory powders [2].…”

Section: Introductionmentioning

confidence: 99%

“…One of the main problems of the process is the low sinterability of the carbon source with most refractory powders [2]. Some papers have reported the fabrication of carbon-ceramic composites using self-sintering ground raw coke, with improved mechanical properties and oxidation resistance, with the advantage of not requiring the use of a binder or hot-pressing processes [1][2][3][4]. However, these processes usually require the mixture of the coke particles and the ceramic precursor, which may lead to the presence of inhomogeneities in the material or unwanted accumulations of the ceramic component.…”

Section: Introductionmentioning

confidence: 99%

Preparation of graphite/nano-SiC composites by co-pyrolysis of a petroleum residue with phenylsilanes

Carreira

Sanchez-Coronado

Narciso

et al. 2008

Journal of Analytical and Applied Pyrolysis

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Growth of graphite particles in carbons/SiC/B4C composites

Cited by 8 publications

References 0 publications

Effect of Carbon Addition and Mixture Method on the Microstructure and Mechanical Properties of Silicon Carbide

Effect of Carbon Addition and Mixture Method on the Microstructure and Mechanical Properties of Silicon Carbide

The influence of carbon source and content on structure and mechanical properties of sic processed via spark plasma sintering method

Preparation of graphite/nano-SiC composites by co-pyrolysis of a petroleum residue with phenylsilanes

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