High temperature phase equilibrium of SiC-based ceramic systems: SiC–Si3N4–R2O3 (R = Gd, Y) systems
The phase relations of the ternary systems SiC–Si3N4–R2O3 (R = Gd and Y) have been investigated by XRD phase analyses of the hot-pressed samples from SiC, Si3N4, and R2O3 powders. Their subsolidus phase diagrams were presented. In situ SiO2 impurity in the powders always led to form some oxygen-richer rare-earth siliconoxynitrides and extend the ternary systems to the quaternary systems of SiC–Si3N4–SiO2–R2O3 (R = Gd, Y). Within these systems all rare-earth siliconoxynitrides coexist with SiC. The phase diagrams of the quaternary systems of SiC–Si3N4–SiO2–R2O3 (R = Gd, Y) were established, in which the subsolidus diagram of Si3N4–SiO2–Gd2O3 system was first reported.
KeywordsY2O3 Phase Relation Gd2O3 Quaternary System Sialon
Supported by National Natural Science Foundation of China, NSFC50962001.
- 3.Jiang Y, Wu L, Qin Q, Huang Z (2010) Procss Prop Adv Ceram Compos II 220:109Google Scholar
- 5.A. E. McHale (1994) Phase diagrams for ceramists, Vol. X. Compiled at National Institute of Standards and Technology. The American Ceramic SocietyGoogle Scholar
- 6.Jack KH (1978) Mater Sci Res 11:561Google Scholar
- 14.El-Sheikh SM, Yasser MZ, Ahmed EM, Ewais M, Al-Sharab JF (2010) J Am Ceram Soc 93(7):2082Google Scholar