Influence of Yttrium Doping on the Oxidation of Mo(Si,Al)2 in Air at 1500 °C
Journal article, 2022

Mo(Si,Al)2 with different yttrium (Y) additions (up to 2 at.%) was synthesised by dry powder mixing followed by compaction and sintering. In as-sintered materials, Y was present as yttrium aluminium garnet. The materials were exposed in air at 1500 °C for up to 250 h to study the effect of Y on oxidation behaviour. The oxides formed were investigated using scanning electron microscopy (SEM)-based techniques and X-ray diffraction. While the Y-free Mo(Si,Al)2 formed a scale consisting of Al2O3 and a small amount of mullite, the Y-containing samples formed oxides containing both yttrium silicate and larger fractions of mullite, in addition to Al2O3. Oxidation rate, scale spallation, as well as the evaporation of Mo, all increased with Y addition.


Reactive elements


Mo(Si,Al) 2


Aina Edgren

Chalmers, Physics, Microstructure Physics

Kanthal AB

Lars-Gunnar Johansson

Chalmers, Chemistry and Chemical Engineering, Energy and Material

E. Strom

Kanthal AB

Magnus Hörnqvist Colliander

Chalmers, Physics, Microstructure Physics

Oxidation of Metals

0030-770X (ISSN) 1573-4889 (eISSN)

Vol. 98 5-6 415-427

Developing next generation high temperature MoSi2 materials

Swedish Foundation for Strategic Research (SSF) (ID18-0064), 2019-10-01 -- 2023-09-30.

Subject Categories

Inorganic Chemistry


Materials Chemistry


Chalmers Materials Analysis Laboratory



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