Paper Title:
Evolution of Al2O3 Scale Formed on Ni-Al-Pt Alloy in Atmospheres Containing Water Vapor
  Abstract

High temperature cyclic oxidation behavior of γ'-base Ni-25Al-10Pt (in at.%) alloy was investigated at 1000°C in air with and without 30vol.%H2O. The oxidation mass gain during the initial stage of oxidation was similar in both atmospheres, but the oxidation rate in air+H2O was lower in the longer steady-state oxidation stage. Metastable Al2O3, which formed during the initial stage of oxidation, transformed completely after about 100hr of oxidation in dry air. The transformation to α-Al2O3 also occurred in air+H2O, but complete transformation to α-Al2O3 was not observed during the oxidation time in the present study. θ-Al2O3 grains remained for longer on the α-Al2O3 layer in air+H2O and became significantly coarser with oxidation time. The present results indicate that water vapor delays the metastable to α-Al2O3 phase transformation, and decreases the growth rate of α-Al2O3.

  Info
Periodical
Edited by
Toshio Maruyama, Masayuki Yoshiba, Kazuya Kurokawa, Yuuzou Kawahara and Nobuo Otsuka
Pages
132-137
DOI
10.4028/www.scientific.net/MSF.696.132
Citation
M. Auchi, S. Hayashi, T. Narita, S. Ukai, "Evolution of Al2O3 Scale Formed on Ni-Al-Pt Alloy in Atmospheres Containing Water Vapor", Materials Science Forum, Vol. 696, pp. 132-137, 2011
Online since
September 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Athirah Ahmad, Koay Mei Hyie, N.R. Nik Roselina, Firdaus Munir, Choong Soo Li, Sheridan Saidin
Chapter II: Bio and Chemical Engineering Materials, Technologies and Applications
Abstract:Electrodeposition is a method to electrochemically deposit alloy on various types of metal. This method has ability to produce protective...
545
Authors: Roberta Monteiro de Mello, Ana Helena de Almeida Bressiani
Chapter 3: Thermo-Mechanical Ceramics
Abstract:The aim of this study was to evaluate the effect of Y2O3:Al2O3 additives and sintering...
103