Abstract
Melt infiltration process was employed to fill molten MoSi 2 into the pores of recrystallized silicon carbide (RSiC) to improve the oxidation resistance of RSiC, and an almost fully dense RSiC–MoSi 2 composite with the microstructure of two-phase interpenetrated network was obtained. The phase compositions of the composites are mainly SiC and MoSi 2, including a small amount of Mo 4.8Si 3C 0.6 and Mo 5Si 3. The flexural strength of the composites at room temperature was 11–32% higher than that of as-received RSiC. The cyclic oxidation tests at 1500 °C indicated that both the RSiC–MoSi 2 composites and RSiC exhibited a parabolic oxidation behavior, and the corresponding parabolic rate constants of the composites were almost an order of magnitude lower than those of RSiC, resulting in a great improvement of oxidation resistance of RSiC–MoSi 2.
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