Preparation and microstructure of a Si-Mo fused slurry coating on carbon/carbon composites for oxidation protection

A coating of composition Si-40Mo (wt pct) was prepared by the fused slurry coating method on the two-dimensional carbon/carbon (2D-C/C) composite to improve the oxidation resistance. In the procedure of the fabrication, the pure Si slurry inner layer in the pre-coating was necessary to be applied because of the infiltration of liquid Si into the substrate during the sintering. The coating consisted of the Si continuous phase and MoSi2 particles. In addition, the infiltration of Si into the substrate and the SiC reaction layer between the coating and the C/C composite were observed. The oxidation resistance and the thermal shock resistance of the Si-Mo fused slurry coating were quite excellent at 1370°C.