Abstract
Mo–Si–B alloys were obtained by spark plasma sintering (SPS) using fine Mo–Si–B alloy powders with a particle size of 2.5 μm. The SPS Mo–Si–B alloys consisted of fine MoSi2/Mo2Bi5(Mo5Si3)/MoB/SiO2 phases. Under isothermal conditions, the weight-gain kinetics of the Mo–Si–B alloys obtained by SPS exhibited parabolic time dependence and these Mo–Si–B alloys showed better oxidation resistance at moderate temperatures of 500 °C and 600 °C with no “pest” failure. The oxide scale on the sample surface consisted of MoO3, amorphous borosilicate and crystalloid SiO2 phases. An increase in the oxidation temperature from 500 to 600 °C caused a significantly higher fluidity and a shorter incubation stage for the formation of a continuously protective borosilicate layer, so that the mass gain was smaller than 1 mg/cm2 for oxidation at 600 °C for 100 h, which corresponds to the excellent oxidation resistance.
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