Oxidation-resistance of ZrB2-MoSi2 Composite Coatings Prepared by Atmospheric Plasma Spraying

doi:10.15541/jim20140389

Abstract

Abstract:

Agglomerated ZrB₂-MoSi₂ composite powders with different contents of MoSi₂ were successfully prepared by spray drying and vacuum sintering. Then ZrB₂-MoSi₂ composite coatings were deposited on C/C composites by atmospheric plasma spraying (APS) using ZrB₂-MoSi₂ composite powders with average size of 30 μm as raw material. The microstructure and anti-oxidation performance of coatings were characterized by XRD, SEM, etc. It could be found out that the microstructure of ZrB₂-MoSi₂ composite coatings was dense with bonding strength up to 7.2 MPa. And oxidation-resistance of composite coating at high temperature could be improved by appropriate addition of MoSi₂. The weight loss of C/C composites coated by ZrB₂-40wt%MoSi₂ coating was only 1.7% after 9 h in air at 1500℃. The coating exhibited good self-sealing performance and excellent anti-oxidation ability.

Key words: spraying drying, C/C composite, ZrB2-MoSi2 composite coatings, atmospheric plasma spraying, anti-oxidation performance

CLC Number:

TB332

MAO Jin-Yuan, LIU Min, MAO Jie, DENG Chun-Min, ZENG De-Chang, XU Lin. Oxidation-resistance of ZrB₂-MoSi₂ Composite Coatings Prepared by Atmospheric Plasma Spraying[J]. Journal of Inorganic Materials, 2015, 30(3): 282-286.

Figures/Tables 9

Fig. 1 Morphologies of ZrB2 (a) and MoSi2 (b) starting materials

Fig. 2 Morphologies of agglomerated ZrB2-MoSi2 composite powders at low magnification (a); and high magnification of single powder (b)

Table 1 APS parameters for ZrB2-MoSi2 coatings

Current/A	Voltage/V	Flux of Ar/ (L·min^-1)	Flux of H₂/ (L·min^-1)	Powder feed rate/ (g·min^-1)	Distance/mm
700	75	40	11	7	110

Fig. 3 XRD patterns of as-sprayed ZrB2-MoSi2 composite coatings

Fig. 4 Polished cross-section morphologies of as-sprayed ZrB2-MoSi2 composites coatings (a ) ZM30; (b) ZM40; (c) ZM50

Fig. 5 Isothermal oxidation curves of ZrB2-MoSi2 coated C/C composites at 1500℃ in air

Fig. 6 XRD patterns of ZrB2-MoSi2 composites coatings after oxidation at 1500℃ in air for 9 h

Fig. 7 SEM images of fracture surfaces of ZrB2-MoSi2 composites coatings after oxidation at 1500℃ for 9 h (a) ZM30; (b) ZM40; (c) ZM50

Fig. 8 Surface morphologies and EDS analysis of ZrB2-MoSi2 composites coatings after oxidation at 1500℃ for 9 h (a) ZM30; (b) ZM40; (c) ZM50

References 18

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Oxidation-resistance of ZrB₂-MoSi₂ Composite Coatings Prepared by Atmospheric Plasma Spraying

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