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- W2017264988 abstract "Abstract A life prediction tool for mechanical and electrical applications of electroconductive structural ceramics is essential in order to know the limit for engineering uses. The aim of this work was to study the influence of additives content on the oxidation behaviour, in pure oxygen between 900 and 1400 °C, of two fully dense Si 3 N 4 –35 vol.% TiN composites. For this purpose, a hot pressed material (HP), containing 3.7 wt.% of Y 2 O 3 and Al 2 O 3 as sintering aids, was compared to an hipped material (HIP), containing 0.4 wt.% of the same additives. Up to a temperature T T >∼1200 °C, when the oxidation of the Si 3 N 4 matrix takes place. The formation of a compact silica sub-scale acts as an efficient diffusion barrier leading to asymptotic kinetics, with final weight gains exhibiting a negative temperature dependence. In the case of the HP material, i.e. in presence of a higher content of additives, a deterioration of the protective nature of the scale is provoked by the increased mobility of the impurity cations (Y 3+ , Al 3+ ) linked to a decrease of the viscosity of the secondary glassy phase. The kinetics have a paralinear shape up to 1400 °C, with final weight gains increasing as a function of temperature. Therefore, this study confirms the deleterious influence on oxidation resistance of additives used for a better sintering of powders and the beneficial effect of hot isostatic pressing for which lower amounts of aids are necessary in comparison with hot pressing." @default.
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- W2017264988 date "2003-04-01" @default.
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- W2017264988 title "Influence of additives content on the high temperature oxidation of silicon nitride based composites" @default.
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- W2017264988 doi "https://doi.org/10.1016/s0955-2219(02)00376-x" @default.
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