Microstructure and cyclic ablation behaviour of a Si–Mo–Ti protected C/C composites by a two-step method

ABSTRACT

A two-step method combining reactive melt infiltration and slurry coating was employed to fabricate completely protected C/C composites. Microstructure and cyclic ablation behaviour of the composites were investigated. Results show that a SiC transition layer can be obtained when ceramic coating generated during the infiltration process is preserved as part of the substrate for the slurry coating process. The SiC transition layer can improve the cyclic ablation resistance of the composites. The transition layer is the thickest when the chemical composition of the mixed powder used in the slurry coating process is n(Si):n(Mo):n(Ti) = 8:1:3. Such composites have the best cyclic resistance with 0.055 mg/cm² mass loss in each ablation cycle.

KEYWORDS:

• Ceramic matrix composites
• ceramic coatings
• cyclic ablation behaviour
• reactive melt infiltration
• slurry coating

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [51405522].