Abstract
Creep resistance and microstructure changes of two MoSi₂ based materials were studied. The first one was MoSi₂ with 15 vol.% of SiC and the second one MoSi₂ with 15 vol.% of HfO₂ particles. Creep tests were realized in 4-point bending mode in ambient air at temperatures 1100-1400 °C under a stress of 100 MPa. The microstructure and its response to high temperature load were investigated by TEM using thin foil technique. Comparison of the creep resistance of both materials at each particular testing temperature shows that the performance of MoSi₂-15%HfO₂ was about one order of magnitude better than that of MoSi₂-15%SiC.

Key words
molybdenum disilicide, MoSi₂-SiC and MoSi₂-HfO₂, creep behaviour, powder metallurgy, diffusion

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