Journal
JOURNAL OF ADVANCED CERAMICS
Volume 11, Issue 1, Pages 145-157Publisher
SPRINGER
DOI: 10.1007/s40145-021-0523-9
Keywords
infiltration process; channel pore; densification; pressure assistant; environmental barrier coating (EBC)
Categories
Funding
- National Natural Science Foundation of China [51901175]
- Guangdong Province Outstanding Youth Foundation [2021B1515020038]
- Guangzhou Technical Research Program [201906010015]
- Industry University Research Project - Aero Engine Corporation of China [HFZL2019CXY015]
- Postdoctoral Research Foundation of China [2020T130499, 2019M653602]
- National Program for Support of Top-notch Young Professionals
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The research proposed a method of pressure infiltration densification to block the open pores in the coatings, preventing the transport of oxidants and corrosives, ultimately improving the performance stability of EBCs in harsh engine environments.
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.
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