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Thermodynamic Analysis of the CaO–Y 2 O 3 –ZrO 2 –Ti–Fe 2 O 3 System as a Precursor for SHS-Produced Pyrochlore-Based Ceramics
International Journal of Self-Propagating High-Temperature Synthesis ( IF 0.5 ) Pub Date : 2020-01-15 , DOI: 10.3103/s1061386219040113
K. B. Podbolotov , T. V. Barinova , B. B. Khina , M. V. Velichko

Abstract

The paper reports on the thermodynamic analysis of the CaO–Y2O3–ZrO2–Ti–Fe2O3 system as a precursor for SHS-produced pyrochlore-based ceramics. Adiabatic combustion temperature Tad and equilibrium concentration of pyrochlore were first calculated for the quasi-ternary system Y2O3–ZrO2–(Ti + Fe2O3) containing no CaO. It was found that, in the presence of CaO, a best yield of Zr-enriched pyrochlore ceramic can be reached within the following domain of green compositions (wt %): CaO 2.5–5.0, Y2O3 22.5–35.0, ZrO2 7.5–22.5, and (40% Ti + 60% Fe2O3) 45.0–60.0; within this domain, Tad = 2100–2400°K. Although in control experiments Tad was found to be within the range 1700–1970 K, nevertheless the combustion products always showed the presence of pyrochlore-based ceramic, as predicted by thermodynamic analysis.


中文翻译:

CaO–Y 2 O 3 –ZrO 2 –Ti–Fe 2 O 3系统作为前驱体用于SHS生产的烧绿石基陶瓷的热力学分析

摘要

本文报道了作为SHS生产的烧绿石基陶瓷前体的CaO–Y 2 O 3 –ZrO 2 –Ti–Fe 2 O 3系统的热力学分析。首先计算不含CaO的准三元体系Y 2 O 3 -ZrO 2-(Ti + Fe 2 O 3)的绝热燃烧温度T ad和烧绿石的平衡浓度。发现在存在CaO的情况下,可以在以下绿色组成(wt%)范围内达到最佳的富Zr烧绿石陶瓷的最佳产量:CaO 2.5–5.0,Y 2 O 322.5-35.0,ZrO 2 7.5-22.5和(40%Ti + 60%Fe 2 O 3)45.0-60.0;在这个范围内,T ad = 2100–2400°K。尽管在对照实验中发现T ad在1700–1970 K范围内,但是燃烧产物始终显示出以热解氯为基础的陶瓷,如热力学分析所预测的那样。
更新日期:2020-01-15
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