Influence of rare-earth oxide additives and SiC nanoparticles on the wear behaviour of Si3N4-based composites at temperatures up to 900 °C

0421222 - ÚFM 2014 RIV CH eng J - Journal Article
Tatarko, P. - Kašiarová, M. - Chlup, Zdeněk - Dusza, J. - Šajgalík, P. - Vavra, I.
Influence of rare-earth oxide additives and SiC nanoparticles on the wear behaviour of Si3N4-based composites at temperatures up to 900 °C.
Wear. Roč. 300, 1-2 (2013), s. 155-162. ISSN 0043-1648. E-ISSN 1873-2577
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0068
Institutional support: RVO:68081723
Keywords : Wear behaviour * Composite * Si3N4 * Rare-earth oxides * SiC nanoparticles
Subject RIV: JH - Ceramics, Fire-Resistant Materials and Glass
Impact factor: 1.862, year: 2013

Influence of various rare-earth (RE) oxide additives and SiC nanoparticles on the wear behaviour of Si3N4-based composites has been investigated under dry sliding conditions at temperatures up to 900 degrees C. A significant influence of both the crystalline character of the grain boundary phases as well as the location of SiC nanoparticles on the wear resistance of the materials has been observed. The wear resistance of the materials with crystalline grain boundary phases increased with decreasing RE3þ for the monoliths as well as the composites due to the higher viscosity and refractoriness of the secondary phases. The presence of the intergranular SiC particles results in lower specific wear rate of composites in comparison with the monoliths. The composites doped with the additives with lower ionic radius such as Lu, Yb and Y exhibited the lowest specific wear rate up to 700 degrees C indicating the best possibility of the application of such materials.
Permanent Link: http://hdl.handle.net/11104/0228071