Oxidation resistance of carbon-ceramics composite materials sintered from ground powder mixtures of raw coke and ceramics

Ogawa, Ichitaro; Kobayashi, Kazuo; Nishikawa, Susumu

doi:10.1007/bf01154601

Cited by 33 publications

(11 citation statements)

References 12 publications

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“…The mass loss rates decreased with time and with decreasing temperature. Figure 2 18) Other research groups detected the borosilicate on the B 4 C-SiC composites 13) and B 4 CSiC-C composites 15,17,18) by X-ray photoelectron spectroscopy and IR absorption spectroscopy. As described later, the liquid borosilicate was investigated by Raman spectroscopy in the present work.…”

Section: Methodsmentioning

confidence: 99%

“…This dependence implies that the rate-controlling process of the oxidation may be the diffusion of oxygen molecules through the liquid borosilicate layer and the oxidation reaction proceeded at the oxide/composite interface. Other research groups 13,[16][17][18] also reported that the oxygen diffusion in the oxide layer could be the ratecontrolling process of composites in the B 4 C-SiC-C system. Figure 12 shows the parabolic rate constants obtained in the present work comparing with those of B 4 C, SiC and B 4 CSiC composites reported in literatures.…”

Section: Oxidation Mechanismmentioning

confidence: 99%

“…The oxide layers on the composites were analyzed by X-ray diffraction, 13,14,17) X-ray photoelectron spectroscopy 13,17) and IR absorption spectroscopy. 18) However, the relationship between the oxidation rate and oxide layer has not been clearly understood in the B 4 C-SiC system.…”

Section: Introductionmentioning

confidence: 99%

“…12) Telle reported that B 4 C-SiC composites synthesized by hotpressing exhibited better oxidation resistance than single phase B 4 C. 13) Liquid B 2 O 3 14) and borosilicate 13,[15][16][17][18] have been reported as oxidation products of composites in the B 4 C-SiC-C system. The oxide layers on the composites were analyzed by X-ray diffraction, 13,14,17) X-ray photoelectron spectroscopy 13,17) and IR absorption spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation of Boron Carbide-Silicon Carbide Composite at 1073 to 1773 K

et al. 2003

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The oxidation behavior of B 4 C-(25-60 mol%)SiC composites prepared by arc-melting was investigated in the temperature range of 1073 to 1773 K using a thermogravimetric technique. Liquid borosilicate, solid SiO 2 and carbon were identified as oxidation products by X-ray diffraction and Raman spectroscopy. Mass gain was observed during oxidation at 1073 K, while mass loss due to the vaporization of boron oxide in liquid borosilicate was observed at temperatures of 1273 K and higher. In situ Raman spectra of the surface of B 4 C-SiC composites indicated that the silica concentration in the liquid borosilicate increased with increasing SiC content in the composite. Micro-Raman spectroscopy showed that carbon was enriched in the borosilicate layer close to the oxide/composite interface. The parabolic rate constants for B 4 C-50 mol%SiC composites at 1073 K were proportional to ambient oxygen partial pressures ranging between 30 and 100 kPa. The diffusion of oxygen molecules through the liquid borosilicate layer could be the rate-controlling process. The increase of SiC content in the B 4 C-SiC composites improved the oxidation resistance in both the mass gain and mass loss regions.

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Section: Methodsmentioning

confidence: 99%

Section: Oxidation Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidation of Boron Carbide-Silicon Carbide Composite at 1073 to 1773 K

et al. 2003

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“…For instance, carbons materials can be used as plasma-facing components for fusion devices due to their high thermal shock resistance, absence of melting and low radiation of carbon atoms from the central plasma. In addition to these properties, this application requires a high thermal conductivity and low erosion by energetic atoms of hydrogen and oxygen [1][2][3][4]. The production of self-passivating materials using graphites doped with metallic carbides is a good method to improve the latter properties.…”

Section: Introductionmentioning

confidence: 99%