Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1636582 | Transactions of Nonferrous Metals Society of China | 2013 | 7 Pages |
Abstract
In order to protect C/C composites from oxidation, SiC-MoSi2 composite coating was synthesized by chemical vapor infiltration /reaction (CVI/CVR) technology. A porous Mo layer was prefabricated on SiC coated C/C composites, and then MoSi2 and SiC were subsequently prepared in a CVI /CVR process using methyltrichlorosilane (MTS) as precursor. The deposition and reaction mechanism of the MoSi2-SiC composite coating was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The oxidation behavior of SiC-MoSi2 coated specimens was tested. The results show that the porous Mo layer can be densified with SiC phase decomposed from MTS, and transformed into SiC-MoSi2 by reacting with MTS as well. A dense composite coating was prepared with optimized deposition parameters. The coated specimen exhibits a good oxidation resistance with a little mass loss of 1.25% after oxidation at 1500 °C for 80 h.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Zi-bo HE, He-jun LI, Xiao-hong SHI, Qian-gang FU, Heng WU,