Journal
CORROSION SCIENCE
Volume 154, Issue -, Pages 111-122Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.04.014
Keywords
Thermal barrier coatings (TBCs); Air plasma spraying (APS); Calcium-magnesium-alumina-silicate (CMAS); Viscosity; Apatite
Funding
- National Natural Science Foundation of China [51501127]
- Natural Science Foundation of Tianjin [16JCQNJC02900, 16JCYBJC18700]
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Calcium-magnesium-alumina-silicate (CMAS) attack is becoming a great challenge for thermal barrier coating (TBC) applications. In this study, CMAS corrosion behavior of LaPO4/YSZ TBCs prepared by air plasma spray was investigated at a temperature range of 1250 degrees C-1350 degrees C for 2 h and 10 h. The corrosion products, mainly consisted of apatite, anorthite and spinel, were independent on the corrosion temperature. At 1250 degrees C, the coating had a high resistance to CMAS infiltration due to the formation of a sealing layer; while at higher temperatures, it was vulnerable to CMAS penetration resulting from the largely decreased melt viscosity.
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