Abstract
A non-silicate material, yttrium phosphate (YPO 4), is developed for the application as environmental barrier coatings. The key issues of environmental durability, phase stability, chemical compatibility, and coefficient of thermal expansion (CTE) are considered for the selection of YPO 4. The water corrosion behaviors for the sol–gel prepared YPO 4 were investigated in an atmosphere of 50% H 2O–50% O 2 water vapor at 1350 °C. The hot corrosion study of YPO 4 was carried out at 900 °C with Na 2SO 4 melt. The results demonstrate that YPO 4 has excellent environmental durability. During these tests, YPO 4 had no phase change and decomposition. Moreover, the reactions between YPO 4 and silica at high temperatures were not detected, indicating the good chemical compatibility of YPO 4. The measured CTE of YPO 4 is close to that of SiC. The suitable CTE, good environmental durability and chemical compatibility, and excellent phase stability of YPO 4 indicate that it is a potential environmental barrier coating material.
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