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Smart Oxygen Diffusion Barrier Based on IrAl Alloy

Published online by Cambridge University Press:  10 February 2011

Hideki Hosoda ,
Sadao Watanabe  and
Shuji Hanada
Hideki Hosoda
Affiliation:
Institute for Materials Research, Tohoku University, 2–1–1 Katahira, Aoba-ku, Sendai 980–8577, Japan, hhosoda@imr.tohoku.ac.jp
Sadao Watanabe
Affiliation:
Institute for Materials Research, Tohoku University, 2–1–1 Katahira, Aoba-ku, Sendai 980–8577, Japan, hhosoda@imr.tohoku.ac.jp
Shuji Hanada
Affiliation:
Institute for Materials Research, Tohoku University, 2–1–1 Katahira, Aoba-ku, Sendai 980–8577, Japan, hhosoda@imr.tohoku.ac.jp
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Abstract

Ir should be used as an effective oxygen diffusion barrier (ODB) for ultrahigh temperature structural materials since If exhibits extremely low oxygen diffusivity. Oxidation resistance of Ir is, however, not good due to formation of gaseous oxide, IrO3, over 1390K. In this study, the improvement of oxidation resistance was aimed through alloy design of alloying with Al. IrAl is expected to form a self-healing multifunctional layered structure composed of Ir layer as ODB and A12O3 layer as a protective oxide (PO) on the Ir layer. Ar arc-melted IrAl alloy was crushed into powder, followed by hot pressing and heat treatment to remove Ir formed by eutectic reaction. Oxidation behavior was measured using thermogravimetry (TG) and differential thermal analysis (DTA) under the conditions of (1) dynamic heating of 0.167K/s and (2) isotherms at 1273K to 1673K in O2 environment. It was found that oxidation resistance is much improved by alloying with At and that the designed structure (PO/ODB) is formed on the IrAl substrate. Compressive mechanical properties were investigated from RT to 1873K: both the strength as a function of normalized temperature and specific strength are higher than those of pure Ir, NiAl, TiAl and Ni3A1. IrAl is promising as a advanced smart coating material equipping good oxidation resistance as well as high temperature strength.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK8.33.1
Copyright
Copyright © Materials Research Society 1999

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