Abstract
The present work investigated the phase relations in SiC-Al2O3-Y2O3-SiO2 (Si-Al-Y-O-C) system. As a continuation of our previous works, the purpose of this study is to understand the high temperature reaction behaviors of SiO2 in the system and its effect on the phase relations of the valuable system of SiC-Al2O3-Y2O3. The phase compositions of six solid-state reacted samples with different components of Y2O3:Al2O3:SiC:SiO2 were analyzed by XRD. The phase relations of the systems were determined. The subsolidus phase diagrams of ternary Al2O3-SiC-SiO2 system and the tentative phase diagram of an extended quaternary Y2O3-Al2O3-SiC-SiO2 system were presented latter involving several coexisting regions of four phases. The high temperature reaction behavior of SiO2 in the system and its effect on the phase relations of system were discussed.
Highlights
SiC ceramic is one of advanced structural ceramics with excellent mechanical properties, mainly in high temperature properties, high hardness, wear resistance, as well as good chemical resistance
A few of SiO2 on SiC surface caused by oxidation of SiC has the non-ignorable effect on the sintering of SiC-Y2O3-Al2O3 system at high temperature
Selected compositions were marked as YASS in order of Y2O3/Al2O3/SiC/SiO2
Summary
SiC ceramic is one of advanced structural ceramics with excellent mechanical properties, mainly in high temperature properties, high hardness, wear resistance, as well as good chemical resistance. The effect of SiO2 on phase relations of SiC-Y2O3-Al2O3 ternary systems is being concerned. For made it clear this effect, understanding the reaction of SiO2 with other members in the system at high temperature is required. As the continuation work of them, the present work investigates the high temperature reaction behavior of SiO2 and the phase relations in the Y2O3-Al2O3-SiC-SiO2 system. In this quaternary system the phase diagram of Y2O3-SiO2 subsystem has been identified to form two Y2Si2O7 and Y2SiO5 compounds [9] [10].
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