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.
Published Version
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