Oxidation behavior of Al2O3 reinforced MoSi2 composite coatings fabricated by vacuum plasma spraying

Effects of milling methods on the dielectric and the mechanical properties of hot-pressed sintered MoSi2/Al2O3 composites

“…Many physical properties of MoSi 2 and its composites have been extensively studied in the past two decades [10][11][12]. However, it appears that there are few reports on the dielectric properties of MoSi 2 and its composites at GHz frequencies [13,14].…”

Oxidation resistance of Mo(Si1−xAlx)2 nanocrystalline films and characterization of their oxide scales by electrochemical impedance spectroscopy

“…Compared with the Mo-Si oxide formed on MoSi 2 , the mixture of the oxides of Mo, Si and Al has greater plasticity and better protective properties by reducing the oxygen inux toward the oxide scale/lm interface. 15,17 The volume expansion associated with the formation of Al 2 O 3 from Al was 104.9%, much less than that for MoO 3 and SiO 2 .…”

“…15 Such a signicant volume expansion can generate large local wedging stresses at these existing defects that widen the cracks or enlarge the pores, ultimately resulting in catastrophic disintegration of MoSi 2 . 12 To overcome this problem, either the incorporation of ceramic phases to form MoSi 2 -based composites 4,16,17 or alloying treatment [18][19][20] has been proposed to improve the low-temperature oxidation resistance of MoSi 2 . Amongst different alloying elements used, Al was thought to be the most favorable candidate, 21 due to the fact that Al has stronger affinity to oxygen than Si.…”

Combustion synthesis of Cr–Al and Cr–Si intermetallics with Al2O3 additions from Cr2O3–Al and Cr2O3–Al–Si reaction systems

“…High exothermicity of the thermite reaction between Cr 2 O 3 and Al is beneficial for solid state combustion to achieve self-sustaining and to facilitate the formation of chromium aluminides and silicides. Moreover, the by-product Al 2 O 3 serves to improve the fracture toughness, oxidation resistance, and mechanical strength of the composite materials [25,26]. Specifically, the effects of sample stoichiometry on combustion characteristics are studied, including sustainability of the combustion process, combustion temperature, and flame-front propagation velocity.…”