کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1477516 991186 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oxidation of titanium carbide–graphite hetero-modulus ceramics with low carbon content: II. Physico-chemical interpretation of the ridge effect
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Oxidation of titanium carbide–graphite hetero-modulus ceramics with low carbon content: II. Physico-chemical interpretation of the ridge effect
چکیده انگلیسی

Hetero-modulus ceramics (HMC) present the combination of a ceramic matrix with the inclusions of a dispersed phase with considerably lower Young's modulus, resulting in a material with significantly improved properties. An interpretation of the so-called “ridge effect” observed during the isobaric-isothermal oxidation of 93 vol% TiC–7 vol% C (graphite) HMC at temperatures of 400–1000 °C and oxygen pressures of 0.13–65 kPa is given. Established in Part I of this study, the meanings of a ridge temperature and ridge oxygen pressure, which are served as boundaries between prevailing oxidation mechanisms in phenomenological kinetics model, are considered on the basis of X-ray diffraction (XRD) and microscopy analyses. The oxidation mechanisms, essentially different within the studied ranges of temperatures and oxygen pressures are identified according to the developed general model. These results can be used for the preparation of special protective coatings on the surface of refractory carbide–carbon HMC parts applied in severe environments, e.g. chemically active, high-enthalpy gaseous flows.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 28, Issue 16, December 2008, Pages 3177–3188
نویسندگان
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