Multifunctional coating design for high-temperature materials

W. Y. Lee, H. Li, Y. F. Su

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

This paper highlights our recent discoveries associated with improving the reliability and life of next-generation metallic and ceramic turbine components via re-thinking and re-designing the multifunctionality of a few coating systems. For SiC/SiC ceramic matrix composites, we found that a pre-delaminated ZrO2 coating, prepared by chemical vapor deposition (CVD), could serve as an intrinsically oxidation resistant interphase while providing the weak interface behavior desired for the composites. Stress-rupture results show that the ZrO2 coating, when its nucleation behavior is properly controlled, can provide outstanding composite performance at 950 and 1200°C. Our approach appears to provide a unique solution to the posting problem associated with state-of-the-art SiC/SiC composites containing a BN fiber coating. For Ni-based superalloys, we developed a novel procedure to prepare a ∼150 nm thick α-A12O3 layer directly on the superalloy surface. Oxidation results show that such a layer has profound effects on the phase contents and morphological evolutions of thermally grown oxide (TOO) and significantly reduces the TOO growth rate. Implications of the oxidation results are discussed in the context of optimizing the multifunctionality (i.e., thermal insulation and oxidation resistance) of next-generation thermal barrier coatings.

Original languageEnglish
Pages (from-to)137-144
Number of pages8
JournalMaterials Science Forum
Volume426-432
Issue number1
DOIs
StatePublished - 2003
EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
Duration: 7 Jul 200311 Jul 2003

Keywords

  • Chemical vapor deposition
  • Fiber coating
  • Oxidation
  • Thermal barrier coatings

Fingerprint

Dive into the research topics of 'Multifunctional coating design for high-temperature materials'. Together they form a unique fingerprint.

Cite this