Complex investigation of hot-pressed boron carbide

Gogotsi, G. A.; Groushevsky, Ya.L.; Dashevskaya, O. B.; Gogotsi, Yu.G.; Lavrenko, V. A.

doi:10.1016/0022-5088(86)90037-8

Cited by 40 publications

(21 citation statements)

References 6 publications

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“…The oxidation rates measured so far by several authors [3][4][5][6][7][8] are all different. This is probably due to the different flow conditions, atmospheres and the variety of set-ups used in these tests, as the convective diffusion equation for the gaseous components depends on the whole flow velocity field.…”

Section: Importance Of the Flow Conditionsmentioning

confidence: 97%

“…(15) and (29) together with Eqs. (3) and (6). It should also be kept in mind that the rate parameter a ox does not depend on the flow conditions nor on the steam partial pressure.…”

Section: Importance Of the Flow Conditionsmentioning

confidence: 99%

“…The results of these tests vary in a wide range and are strongly dependent on the material composition and the physical form of the specimens and on the test conditions. The authors in [3][4][5][6] recognized the importance of some test parameters like steam partial pressure but ignored the effect of others like flow velocity and system pressure and how the whole test set-up and the flow conditions influence the results.…”

Section: Introductionmentioning

confidence: 99%

“…There have been some experimental investigations on the oxidation of boron carbide done in the past [3][4][5][6] at temperatures mostly below 1000°C. The results of these tests vary in a wide range and are strongly dependent on the material composition and the physical form of the specimens and on the test conditions.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of boron carbide oxidation in steam

Steiner¹

2005

Journal of Nuclear Materials

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Section: Importance Of the Flow Conditionsmentioning

confidence: 97%

“…(15) and (29) together with Eqs. (3) and (6). It should also be kept in mind that the rate parameter a ox does not depend on the flow conditions nor on the steam partial pressure.…”

Section: Importance Of the Flow Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of boron carbide oxidation in steam

Steiner¹

2005

Journal of Nuclear Materials

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“…The oxidation behavior has been reported by several research groups. [4][5][6][7][8][9][10] Liquid B 2 O 3 was detected as the oxidation product. The liquid B 2 O 3 layer can not effectively protect boron carbide because of its low viscosity and high vapor pressure at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

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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