View in EDS

A Study on Effect of Reactive and Rare Earth Element Additions on the Oxidation Behavior of Mo-Si-B System.

Saved in:
Bibliographic Details
Title: A Study on Effect of Reactive and Rare Earth Element Additions on the Oxidation Behavior of Mo-Si-B System.
Authors: Majumdar, Sanjib sanjib.majumdar@uni-siegen.de, Burk, S.1 burk@ifwt.mb.uni-siegen.de, Schliephake, D.2 daniel.schliephake@kit.edu, Krüger, M.3 manja.krueger@mb.uni-magdeburg.de, Christ, H.-J.1 Hans-Juergen.Christ@uni-siegen.de, Heilmaier, M.2 martin.heilmaier@kit.edu
Source: Oxidation of Metals. Oct2013, Vol. 80 Issue 3/4, p219-230. 12p.
Subjects: Rare earth metals, Molybdenum, Silicon, Mechanical alloying, Scanning electron microscopes, Electron backscattering, Comparative studies
Abstract: Mo-9Si-8B-1Ti, Mo-9Si-8B-1.8Ti, Mo-9Si-8B-0.2La and Mo-9Si-8B-0.4LaO (at.%) alloys were prepared using mechanical alloying followed by hot isostatic pressing and field assisted sintering. XRD, SEM and EBSD analysis confirmed the formation of Mo solid solution, A15 and T2 phases in the alloys. Isothermal oxidation behavior of the specimens was studied in the temperature range from 750 to 1,300 °C for up to 100 h. Both the Ti and La containing alloys showed superior oxidation behavior compared to unalloyed Mo-Si-B at 900 °C at the initial periods of oxidation. Ti-added alloys suffered higher rate of weight loss at higher temperatures (1,000-1,300 °C) due to the formation of non-protective low viscosity SiO-TiO-BO scale. La-alloyed Mo-Si-B showed superior oxidation resistance at intermediate temperatures (900 °C) as well as at higher temperatures. Enrichment of La at the oxide/alloy interface was found to be the reason for improved oxidation behavior of La-alloyed Mo-Si-B. Amongst the four materials studied, the LaO containing alloy showed the best oxidation resistance at 900 °C. [ABSTRACT FROM AUTHOR]
Copyright of Oxidation of Metals is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:Mo-9Si-8B-1Ti, Mo-9Si-8B-1.8Ti, Mo-9Si-8B-0.2La and Mo-9Si-8B-0.4LaO (at.%) alloys were prepared using mechanical alloying followed by hot isostatic pressing and field assisted sintering. XRD, SEM and EBSD analysis confirmed the formation of Mo solid solution, A15 and T2 phases in the alloys. Isothermal oxidation behavior of the specimens was studied in the temperature range from 750 to 1,300 °C for up to 100 h. Both the Ti and La containing alloys showed superior oxidation behavior compared to unalloyed Mo-Si-B at 900 °C at the initial periods of oxidation. Ti-added alloys suffered higher rate of weight loss at higher temperatures (1,000-1,300 °C) due to the formation of non-protective low viscosity SiO-TiO-BO scale. La-alloyed Mo-Si-B showed superior oxidation resistance at intermediate temperatures (900 °C) as well as at higher temperatures. Enrichment of La at the oxide/alloy interface was found to be the reason for improved oxidation behavior of La-alloyed Mo-Si-B. Amongst the four materials studied, the LaO containing alloy showed the best oxidation resistance at 900 °C. [ABSTRACT FROM AUTHOR]
ISSN:0030770X
DOI:10.1007/s11085-013-9374-2