Effects of Nb-Alloying on High-Temperature Oxidation of MoSi_2

• Authors: A. Sharif
• Languages of publication: EN

Abstracts

EN

The effects of alloying with 0.5, 1.0, and 2.0 at.% Nb on oxidation resistance of MoSi_2 are investigated at temperature range of 1400°C-1700°C. Rapid formation of a stable protective layer of silica resulted in a parabolic oxidation rate. The oxide layer thickness and the sample weight increased with increasing oxidation time. Impurities accelerated oxidation rate of MoSi_2 only slightly, however, did not affect the rate controlling mechanism for oxidation. There was no correlation between oxidation rate and the amount of impurity. The values of activation energies for oxidation of pure MoSi_2 and Nb-alloyed samples were similar to activation energy for diffusion of O_2 through silica. Diffusion of O_2 through the oxide scale remained the rate controlling mechanism with or without Nb impurity.

Keywords

EN

64.75.Lm

Discipline

• 64.75.Lm: Phase separation and segregation in oxidation(for general surface oxidation studies in surface treatments, see 81.65.Mq)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 2
• Pages: 563-566

Dates

published

2014-02

Contributors

author

A. Sharif

• California State University Los Angeles, Department of Mechanical Engineering 5151 State University Dr., Los Angeles, CA 90032-8153, USA

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Identifiers

DOI

10.12693/APhysPolA.125.563