High-Temperature Oxidation Behavior of a Single-Layer IrAl Intermetallic Coating

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Lian Zhu
  • Yicong Ye
  • Shuxin Bai
  • Hong Zhang
  • Yuanlin Ai
  • Shun Li
  • Yu Tang

Detail(s)

Original languageEnglish
Pages (from-to)749–766
Journal / PublicationOxidation of Metals
Volume91
Issue number5–6
Online published14 Mar 2019
Publication statusPublished - Jun 2019
Externally publishedYes

Abstract

In order to improve the high-temperature service property of Ir, a well-bonded single-layer pure IrAl intermetallic coating was prepared on Ir by pack cementation followed by vacuum annealing treatment. The oxidation behavior of the IrAl coating was investigated by cyclic oxidation tests at 1400–2000 °C and compared with that of pure Ir. The results showed that the IrAl coating, although containing many cracks, exhibited excellent oxidation resistance over the whole experimental temperature range. The reasons were deduced to be the in situ formation of Al2O3 and the sintering of the cracks in the IrAl layer. The excellent oxidation protective effect of the single-layer IrAl coating can be ascribed to its stable and unique as-oxidized microstructure, i.e., double-layer structure of Al2O3/Ir′, which showed excellent compatibility and comprehensive property.

Research Area(s)

  • Cyclic oxidation, Intermetallics, Iridium aluminide, Pack cementation

Citation Format(s)

High-Temperature Oxidation Behavior of a Single-Layer IrAl Intermetallic Coating. / Zhu, Lian; Ye, Yicong; Bai, Shuxin; Zhang, Hong; Zhang, Kaili; Ai, Yuanlin; Li, Shun; Tang, Yu.

In: Oxidation of Metals, Vol. 91, No. 5–6, 06.2019, p. 749–766.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review