Phase relations in the ZrO2-Sm2O3-Y2O3-Al2O3 system: experimental investigation and thermodynamic modelling

被引：16

作者：

Fabrichnaya, Olga ^{[1
]}

Savinykh, Galina ^{[1
]}

Zienert, Tilo ^{[1
]}

Schreiber, Gerhard ^{[1
]}

Seifert, Hans J. ^{[1
,2
]}

机构：

[1] Tech Univ Freiberg, Inst Mat Sci, Freiberg, Germany

[2] Karlsruhe Inst Technol, Inst Appl Phys, D-76021 Karlsruhe, Germany

来源：

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH | 2012年 / 103卷 / 12期

关键词：

CALPHAD; Zirconia; Rare earth; Experimental phase equilibria; Phase transformation; ALUMINA; OXIDES;

D O I：

10.3139/146.110794

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Sub-solidus phase relations in the ZrO2-Sm2O3-Y2O3 and Sm2O3-Al2O3-Y2O3 systems were experimentally studied at 1523-1873 K and thermodynamic databases for these systems were developed. Analysis of phase equilibria in the Sm2O3-Y2O3-Al2O3 system indicated that REAM phase (Sm,Y)(4)Al2O9 is not stable in the Sm2O3 rich-composition. Therefore, the stability limit of the Sm4Al2O9 phase was established experimentally and thermodynamic parameters of the Sm2O3-Al2O3 system were re-optimised. The eutectic melting in the Sm2O3-Y2O3-Al2O3 system was investigated using differential thermal analysis and scanning electron microscopy. The results obtained were used to assess the mixing parameter of the liquid phase. A new description of binary system was introduced into the database of the ZrO2-Sm2O3-Al2O3 system and phase diagrams were re-calculated. The obtained thermodynamic databases were combined with literature data for the ZrO2-Y2O3-Al2O3 system and a thermodynamic database for the ZrO2-Sm2O3-Y2O3-Al2O3 system was developed.

引用

页码：1469 / 1487

页数：19

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