Degradation of mechanical and electrical properties after long-term oxidation and corrosion of non-oxide structural ceramic composites

• Published in: Journal of the European Ceramic Society 2005, Vol.25 (10), p.1723-1731
• Main Authors: Medri, Valentina, Bracisiewicz, Marek, Krnel, Kristoffer, Winterhalter, Frederic, Bellosi, Alida
• Format: Article
• Language: English
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Cermets, ceramic and refractory composites; Chemical industry and chemicals; Composites; Corrosion; Cross-disciplinary physics: materials science; rheology; Electrical properties; Exact sciences and technology; Materials science; Mechanical properties; Other materials; Oxidation; Physics; Specific materials; Structural ceramics; Technical ceramics
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2004.12.002

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: Si 3N 4 TiN, Si 3N 4 MoSi 2, AlN SiC MoSi 2, AlN SiC.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.