Degradation of mechanical and electrical properties after long-term oxidation and corrosion of non-oxide structural ceramic composites |
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Affiliation: | 1. Institute of Physics, Centre of Science and Education, Silesian University of Technology, Konarskiego 22B, 44-100 Gliwice, Poland;2. Faculty of Microsystem Electronics and Photonics, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50370 Wroclaw, Poland |
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Abstract: | This work summarizes the results related to the influence of the starting composition and of microstructure on properties degradation, due to oxidation and corrosion, relatively to the following structural ceramics: Si3N4TiN, Si3N4MoSi2, AlNSiCMoSi2, AlNSiC.The effects of: (i) long-term oxidation in air (100 h), in the temperature range 600–1500 °C and (ii) of long-term corrosion (400 h) in acid or basic aqueous solution at RT, 40 and 70 °C, on the electrical resistivity and mechanical strength of the composites are analysed and compared. The degradation of the properties are related to the characteristics of the surface and sub-surface damage after oxidation and corrosion treatments. |
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