Microstructure and mechanical properties of 3-D interpenetrated network structure MoSi2–RSiC composite

In this paper, RSiC is used as matrix, organic precursor impregnation and pyrolysis – MoSi2 melt infiltration combined processes are employed to prepare the 3-D interpenetrated network structure MoSi2–RSiC composite. The composition, microstructure and mechanical properties of MoSi2–RSiC composite are studied through XRD, SEM, EDS and mechanical testing. The results show that an almost fully dense MoSi2–RSiC composite with 3-D interpenetrated network structure is obtained. The main components of the composite are SiC and MoSi2, it also includes small amount of Mo4.8Si3C0.6. The flexural strength of MoSi2–RSiC composite is improved compared with that of RSiC, meanwhile, it inherits the high temperature strength characteristic from RSiC. The composite exhibits a typical brittle fracture behavior and the elastic modulus of it also increases with the increase of organic precursor impregnation and pyrolysis cycles.