Phase relations in the Si–Al–Yb–O–C system. Issue 3 (February 2016)

• Record Type: Journal Article
• Authors: Wei, Zhenbang; Jiang, Yong; Liu, Limeng; Wu, Laner; Huang, Zhenkun
• Is Part Of: Journal of the European Ceramic Society. Volume 36:Issue 3(2016)
• Page Start: 437
• Page End: 441
• Publication Date: 2016-02
• Subjects: Phase relation -- Silicon carbide -- Rare earth -- Alumina -- Liquid phase sintering; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2015.10.014
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: SiC (containing) ceramics were prepared by pressureless sintering at 1400–1750 °C in an argon atmosphere using SiC, Al2 O3, Yb2 O3 and SiO2 as starting materials. Phase compositions of the as-sintered materials were investigated by X-ray diffraction. Subsolidus phase relations in the SiC–Yb2 O3 –Al2 O3 –SiO2 quaternary system were investigated. The results confirmed the formation of oxide compounds of Yb4 Al2 O9 (YbAM), Yb3 Al5 O12 (YbAG), Yb2 SiO5, Yb2 Si2 O7 and mullite, and a solid solution of Yb4 Al2(1 −x ) Si2 x O9 −x (YbAMss) on the YbAM–Yb2 SiO5 tie line. SiC was compatible with each of these phases, as well as the oxides of Al2 O3, Yb2 O3 and SiO2, whereas YbAG was compatible with Yb2 Si2 O7, Al2 O3 and SiC, but was not compatible with mullite. Based on these observations, six compatible four-phase regions were established in the SiC–Yb2 O3 –Al2 O3 –SiO2 phase diagram. Effects of SiO2 on liquid phase sintering and high-temperature mechanical properties of SiC ceramics were discussed.