Preparation and Ultra-high Temperature Oxidation Resistance of Micro-laminated ZrC/MoSi2 Coating on Siliconized Graphite

doi:10.11902/1005.4537.2016.128

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (5): 476-482 DOI: 10.11902/1005.4537.2016.128

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Preparation and Ultra-high Temperature Oxidation Resistance of Micro-laminated ZrC/MoSi₂ Coating on Siliconized Graphite

Tiantian YANG^1,²,Jingjun XU¹(

),Yuhai QIAN¹,Meishuan LI¹

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. University of Chinese Academy of Sciences, Beijing 100039, China

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Abstract

To improve the ultra-high temperature oxidation resistance of graphite-based materials, a SiC transition layer of about 150 μm in thickness was prepared on graphite substrate by siliconizing method, and then a micro-laminated ZrC/MoSi₂ coating of 22.5 μm in total thickness (corresponding five modulation cycles) was deposited on siliconized graphite by DC magnetron sputtering. The crystallographic structure and morphology of the ZrC/MoSi₂-SiC composite coating before and after ultra-high temperature oxidation were examined by X-ray diffraction (XRD), scanning electron microscope (SEM) with energy dispersion spectroscope (EDS). An ultra-high temperature oxidation testing apparatus based on induction heating was used to test the isothermal oxidation rate of the coating. After oxidation at 1800 ℃ in air for 15 min, the weight loss of the micro-laminated coating was 0.3×10^-2 g/cm², only 2.9% of that of the bare graphite. The oxide scale exhibited layered structure, composed alternatively of ZrO₂ grains and molten SiO₂. The existence of the molten SiO₂ could seal the pores and micro-cracks in the ZrO₂ layer. As a result, the oxide scale had ow oxygen permeability.

Key words: ultra-high temperature oxidation micro-laminated coating siliconizing magnetronsputtering

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Tiantian YANG,Jingjun XU,Yuhai QIAN,Meishuan LI. Preparation and Ultra-high Temperature Oxidation Resistance of Micro-laminated ZrC/MoSi₂ Coating on Siliconized Graphite. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 476-482.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.128 OR https://www.jcscp.org/EN/Y2016/V36/I5/476

Fig.1 Schematic drawing of laminated ZrC/MoSi₂coating

Fig.2 Illustration of sample installation in the testing chamber for induction-heating ultrahigh temperature oxidation in air

Fig.3 Surface (a) and cross-sectional (b) morphologies of siliconized graphite

Fig.4 XRD pattern of ZrC/MoSi₂ micro-laminated coating prepared by magnetron sputtering on siliconized graphite

Fig.5 Surface morphology of ZrC/MoSi₂ microla-minated coating deposited by magnetron sputtering on siliconized graphite

Fig.6 Cross-sectional morphology (a) and EDS line scan analysis (b) of ZrC/MoSi₂micro-laminated coating deposited on siliconized graphite by magnetron sputtering

Fig.7 XRD pattern of ZrC/MoSi₂ micro-laminated coating on graphite after oxidation at 1800 ℃ in air for 15 min

Fig.8 Surface morphologies of ZrC/MoSi₂ micro-laminated coating on siliconized graphite afteroxidation at 1800 ℃ in air for 5 min (a) and 15 min (b)

Fig.9 Cross sections (a, b) of ZrC/MoSi₂ micro-laminated coating on graphite after oxidation at 1800 ℃in air for 15 min and the magnified image of areas I (c) and II (d) in Fig.9b

Table 1 PBR values of ZrC and MoSi₂ after thecomplete oxidation

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