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Research Article | Open Access

Pressure infiltration of molten aluminum for densification of environmental barrier coatings

Lin DONG1, Mei-Jun LIU1( ), Xiao-Feng ZHANG2( ), Xue-Shi ZHUO2, Jia-Feng FAN2, Guan-Jun YANG1, Ke-Song ZHOU2
State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
National Engineering Laboratory for Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Science, Guangzhou 510650, China
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Abstract

Environmental barrier coatings (EBCs) effectively protect the ceramic matrix composites (CMCs) from harsh engine environments, especially steam and molten salts. However, open pores inevitably formed during the deposition process provide the transport channels for oxidants and corrosives, and lead to premature failure of EBCs. This research work proposed a method of pressure infiltration densification which blocked these open pores in the coatings. These results showed that it was difficult for aluminum to infiltrate spontaneously, but with the increase of external gas pressure and internal vacuum simultaneously, the molten aluminum obviously moved forward, and finally stopped infiltrating at a depth of a specific geometry. Based on the wrinkled zigzag pore model, a mathematical relationship between the critical pressure with the infiltration depth and the pore intrinsic geometry was established. The infiltration results confirmed this relationship, indicating that for a given coating, a dense thick film can be obtained by adjusting the internal and external gas pressures to drive a melt infiltration.

Keywords

infiltration processchannel poredensificationpressure assistantenvironmental barrier coating (EBC)

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Journal of Advanced Ceramics
Volume 11 Issue 1,
January 2022
Pages 145-157
DOI: 10.1007/s40145-021-0523-9
Cite this article:
DONG L, LIU M-J, ZHANG X-F, et al. Pressure infiltration of molten aluminum for densification of environmental barrier coatings. Journal of Advanced Ceramics, 2022, 11(1): 145-157. https://doi.org/10.1007/s40145-021-0523-9

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Received: 06 April 2021
Revised: 22 July 2021
Accepted: 03 August 2021
Published: 10 November 2021
© The Author(s) 2021.

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