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https://elar.rsvpu.ru/handle/123456789/28147
Название: | Oxidation of titanium carbide-graphite hetero-modulus ceramics with low carbon content. I. Phenomenological modeling of the ridge effect |
Автор: | Shabalin, I. L. Roach, D. L. Shabalin, L. I. |
Дата публикации: | 2008 |
Издатель: | Elsevier BV |
Аннотация: | Hetero-modulus ceramic composite materials (HMC) present an opportunity to combine a ceramic matrix having high Young's modulus with inclusions of a material having a considerably lower value of Young's modulus, resulting in a material with significantly improved properties. The isobaric-isothermal oxidation of 93 vol.% TiC-7 vol.% C (graphite) hot-pressed HMC was studied at temperatures of 400-1000 °C and pressures of 0.13-65 kPa in oxygen flow using a microbalance. The TGA data and carbon content analysis of oxidised samples were applied in the kinetics phenomenological modeling for both carbon burn-off and oxygen consumption processes. The activation energies Q and orders of reaction m were determined for all oxidation parameters and stages of the process, described using a linear-paralinear model. The oxidation behaviour of the material is characterised by the presence of a so-called "ridge effect". The ridge temperature and ridge oxygen pressure serve as boundaries between regions defined by higher or lower values of oxidation parameters and mark a change in the prevailing oxidation mechanism, as while traversing the ridge parameter the values of Q and m change their sign. © 2008 Elsevier Ltd. All rights reserved. |
Ключевые слова: | CARBON CHEMICAL PROPERTIES COMPOSITES HETERO-MODULUS CERAMICS TIC ACTIVATION ENERGY BUILDING MATERIALS CARBON CERAMIC MATERIALS ELASTIC MODULI ELASTICITY GRAPHITE MATERIALS PROPERTIES METALLIC MATRIX COMPOSITES OXYGEN TITANIUM TITANIUM CARBIDE TITANIUM COMPOUNDS CHEMICAL PROPERTIES COMPOSITES HETERO-MODULUS CERAMICS TIC YOUNG'S MODULUS OXIDATION |
ISSN: | 0955-2219 |
DOI: | 10.1016/j.jeurceramsoc.2008.04.035 |
SCOPUS: | 51749123543 |
WoS: | 000260276300021 |
Располагается в коллекциях: | Научные публикации, проиндексированные в SCOPUS и WoS |
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