Ablation Resistance of APS Sprayed Mullite/ZrB2-MoSi2 Coating for Carbon/Carbon Composites. Issue 4 (April 2018)

• Record Type: Journal Article
• Authors: Wei, Han; Min, Liu; Chunming, Deng; Xuezhang, Liu; Dechang, Zeng; Kesong, Zhou
• Is Part Of: Xi you jin shu cai liao yu gong cheng. Volume 47:Issue 4(2018)
• Page Start: 1043
• Page End: 1048
• Publication Date: 2018-04
• Subjects: C/C composites -- atmospheric plasma spraying -- coating -- ablation; Nonferrous metals -- Periodicals; 669.05
• DOI: 10.1016/S1875-5372(18)30117-6
• Languages: English
• ISSNs: 1875-5372

Abstract

Abstract : Abstract: Mullite/ZrB2 -MoSi2 coating was deposited on carbon/carbon(C/C) composites to protect against ablation by atmospheric plasma spraying (APS). The microstructure and morphology of the coating were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The ablation resistance of the coating was investigated at different temperatures with oxypropylene torch. The results show that the mass ablation rates of the Mullite/ZrB2 -MoSi2 coated C/C composites are 3.49×10 −3 g/s and 3.77×10 −3 g/s after ablation at 1700 and 1800 °C for 60 s, respectively, which exhibit good ablation resistance compared with the single-layer ZrB2 -MoSi2 coated. The increase of ablation resistance can be attributed to the formation of a silicates glass film, which acts as a thermal barrier and self-seals the defects of the coatings.