Formation and oxidation resistance of the coating formed on carbon material composed of B4C-SiC powders

Kobayashi, Kazuo; Maeda, Katsutoshi; Sano, Hidehiko; Uchiyama, Yasuo

doi:10.1016/0008-6223(94)00164-u

Cited by 86 publications

(34 citation statements)

References 17 publications

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“…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: 88%

“…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: 97%

“…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. 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%

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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: Oxidation Mechanismmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 97%

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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“…Since that time, it has been recognized that borate glassy materials can be an important constituent of oxidation protection systems for carbon, and much researches have been conducted on variations of this theme [6][7][8][9][10]. These researches were mainly focused on sealing the coating cracks during oxidation by formation of low viscosity B 2 O 3 or borosilicate glass, but control of coating cracks has not been reported.…”

Section: Introductionmentioning

confidence: 98%

Oxidation Protective Multilayer CVD SiC Coatings Modified by a Graphitic B-C Interlayer for 3D C/SiC Composite

Cheng

Yang

et al. 2006

Appl Compos Mater

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A layered graphitic CVD B-C coating was introduced between two CVD SiC coating layers. Microstructure and chemical characterization of the CVD B-C and the hybrid SiC/B-C/SiC multilayer coating was performed using SEM, EDS, XPS and XRD. Oxidation protection ability of the coating for the C/SiC composite was studied using a thermogravimetric analyzer (TGA) in the isothermal mode and by measuring residual flexural strength. The layered graphitic CVD B-C coating middle layer reduced the maximum crack width in the CVD SiC coating. The hybrid SiC/B-C/SiC multilayer coating provided a better oxidation protection for C/SiC composite than a three layer CVD SiC coating due to coating crack control and sealing effects at temperatures up to 1,300°C for 900 min.

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“…In this field, the selfhealing behavior of various ceramics such as silicon carbide (SiC)/mullite [15,16], SiC/Al 2 O 3 [17,18], and C f /SiC ceramic matrix composites can be achieved by introducing hightemperature oxidation additives or boron-containing additives [19][20][21], such as silicon dioxide (SiO 2 ) [22], alumina (Al 2 O 3 ) [23,24], and boron carbide (B 4 C) [25]. The crack healing is mainly attributed to the formation of protective oxide film in the damaged area in ceramics or composites.…”

Section: Introductionmentioning

confidence: 99%

High temperature self-healing SiBCN ceramics derived from hyperbranched polyborosilazanes

Liu

Kong

Luo

et al. 2018

Adv Compos Hybrid Mater

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Self-healing functionality is an important issue of ceramics or ceramic matrix composites used in high temperature and oxidation environment. In this contribution, we reported the cross significant crack self-healing behaviors and mechanism of SiBCN ceramics derived from hyperbranched polyborosilazanes. The self-healing ability of cracks and indention cross sign are enhanced with the increase of oxidation time. And the temperature also influences the healing self-behaviors. The crack healing and indention sign occurred at 1000°C in air atmosphere. The ceramics with high content of boron show much more obvious self-healing performance because the silicon and boron atoms can be reacted with the available oxygen at high temperature to form SiO 2 (l), B 2 O 3 (l), and B 2 O 3 .SiO 2 . The liquid-like products will fill the crack and prevents the destructive of substrates. The preceramic precursor-derived SiBCN ceramics show good self-healing performance and possess great potential in aeronautics, aerospace, and nuclear power industries.

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Formation and oxidation resistance of the coating formed on carbon material composed of B4C-SiC powders

Cited by 86 publications

References 17 publications

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

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

Oxidation Protective Multilayer CVD SiC Coatings Modified by a Graphitic B-C Interlayer for 3D C/SiC Composite

High temperature self-healing SiBCN ceramics derived from hyperbranched polyborosilazanes

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