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Solid Solution and Phase Relations in SiC-AlN-Pr2O3 System

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Abstract

The phase relations in the Si-Al-Pr-O-N-C systems, involving SiC-AlN-Pr2O3, AlN-Pr2O3-Al2O3 and SiC-AlN-Pr2O3-Al2O3 systems were determined by XRD phase analyses of the solid-state reacted samples from powder mixtures of SiC, AlN, Pr2O3, as well as Al2O3. Pr2Al(Si)O3N(C) solid-solution (1:1 ss) between SiC and Pr2AlO3N (1:1 compound) was discovered with the limited solubility of 0.6 SiC at 1650 °C. Subsolidus phase diagram of SiC-AlN-Pr2O3 system was presented, SiC was compatible with AlN, Pr2O3 and 1:1 ss, respectively. Two-aluminates PrAlO3 (PrAP) and PrAl11O18 [β(Pr), β-Al2O3 type] were formed when Al2O3 impurity was introduced in AlN powder. They establish the equilibrium relationships respectively with SiC, AlN, Pr2O3 and Pr2AlO3N. Accordingly, the phase relations in the AlN-Pr2O3-Al2O3 ternary system and SiC-AlN-Pr2O3-Al2O3 quaternary system containing four quaternary phases compatible tetrahedrons were presented.

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Acknowledgments

The present work was financially supported by National Natural Science Foundation of China (NSFC51362001) and Colleges and Universities Oversea Talents Introduce Project (X2017006).

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  1. School of MSE, Beifang University of Nationalities, Yinchuan, 750021, Ningxia, China

    Wengao Pan, Laner Wu, Yong Jiang & Zhenkun Huang

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  1. Wengao Pan
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Correspondence to Laner Wu.

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Pan, W., Wu, L., Jiang, Y. et al. Solid Solution and Phase Relations in SiC-AlN-Pr2O3 System. J. Phase Equilib. Diffus. 38, 676–683 (2017). https://doi.org/10.1007/s11669-017-0576-1

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  • DOI: https://doi.org/10.1007/s11669-017-0576-1

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