Oxidation behavior at 300–1000C of a (Mo,W)Si2-based composite containing boride
Artikel i vetenskaplig tidskrift, 2010

The oxidation behavior of a (Mo,W)Si2 composite with boride addition was examined at 300–1000C for 24 h in dry O2. The oxidation kinetics was studied using a thermobalance, and the oxide scales were analyzed using a combination of electron microscopy (SEM/EDX, FIB, BIB) and XRD. Accelerated oxidation was found to occur between 500C and 675C, with a peak mass gain at 625C. The rapid oxidation is attributed to the vaporization of molybdenum oxide that leaves a porous and poorly protective silica layer behind. At higher temperature (700–1000C) a protective scale forms, consisting of a dense SiO2/ B2O3 glass.

scanning

B. Oxidation

F. Electron microscopy

A. Molybdenum silicides

F. Diffraction

D. Microstructure

Författare

Linda Ingemarsson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Mats Halvarsson

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Kristina M Hellström

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Torbjörn Jonsson

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Mats Sundberg

Kanthal AB

Lars-Gunnar Johansson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Jan-Erik Svensson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Intermetallics

0966-9795 (ISSN)

Vol. 18 1 77-86

Ämneskategorier

Materialteknik

DOI

10.1016/j.intermet.2009.06.013