Influence of h-BN as an additive on oxidation behaviour and kinetic characteristics of carbon/carbon composites

•The kinetic characteristics of C/C–BN are investigated and compared with C/C.•The apparent activation energy in different temperature regions was calculated.•Oxidation-controlling mechanisms were proposed for these composites.•Compared to h-BN content, particle size has a greater effect on oxidatio...

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Bibliographic Details
Published in:Corrosion science 2019-11, Vol.160, p.108162, Article 108162
Main Authors: Niu, Zi-bo, Li, Zhuan, Xiao, Peng, Li, Zhi-chao, Li, Jin-wei, Li, Yang
Format: Article
Language:English
Subjects:
Boron nitride
C/C–BN composites
Carbon
Composite materials
Kinetic characteristics
Oxidation
Oxidation behaviour
Oxidation controlling mechanism
Oxidation resistance
Oxidation tests
Particle size
Reaction kinetics
Self healing materials
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Summary:•The kinetic characteristics of C/C–BN are investigated and compared with C/C.•The apparent activation energy in different temperature regions was calculated.•Oxidation-controlling mechanisms were proposed for these composites.•Compared to h-BN content, particle size has a greater effect on oxidation resistance. Due to favourable self-healing function of its oxidation product, hexagonal boron nitride is now increasingly used to improve the oxidation resistance of carbon-based composites. In this study, based on a kinetics model and isothermal oxidation tests, the influence of h-BN particle size and content on oxidation behaviour and kinetic characteristics of C/C composite at 600–900 °C was discussed. Finally, oxidation-controlling mechanisms were proposed for these composites. The results show that addition of h-BN increases the activation energy of the carbon/oxygen reaction and hinders internal diffusion. Moreover, compared to h-BN content, h-BN particle size has a greater effect on oxidation resistance.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.108162