Recession of Environmental Barrier Coatings under High-Temperature Water Vapour Conditions: A Theoretical Model
Rare-earth disilicates are the major material used on the top layer of environmental barrier coating (EBC) systems. Although rare-earth disilicates are highly resistant to water vapour, corrosion due to water vapour at high temperature is still one of the main reasons of failure of EBC systems. In t...
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MDPI AG
2020-10-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/20/4494 |
| _version_ | 1797551350791274496 |
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| author | Peng Jiang Cheng Ye |
| author_facet | Peng Jiang Cheng Ye |
| author_sort | Peng Jiang |
| collection | DOAJ |
| description | Rare-earth disilicates are the major material used on the top layer of environmental barrier coating (EBC) systems. Although rare-earth disilicates are highly resistant to water vapour, corrosion due to water vapour at high temperature is still one of the main reasons of failure of EBC systems. In this study, a corrosion model of ytterbium disilicates in water vapour at high temperature was derived, based on the gas diffusion theory. Using this theoretical model, we studied the evolution rule of the corroded area on the top layer of the EBC under gas flow at high temperature. The influence of the various parameters of the external gas on the corrosion process and the corrosion kinetics curve were also discussed. The theoretical model shows that the increase in gas temperature, gas flow velocity, water partial pressure, and total gas pressure accelerate coating corrosion. Among these factors, the influence of total gas pressure on the corrosion process is relatively weak, and the effect of the continuous increase of the gas velocity on the corrosion process is limited. The shape of the corrosion kinetics curve is either a straight or parabolic, and it was determined by a combination of external gas parameters. |
| first_indexed | 2024-03-10T15:44:25Z |
| format | Article |
| id | doaj.art-76bfd66d1f7341cabd98136e4e8e7d10 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T15:44:25Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-76bfd66d1f7341cabd98136e4e8e7d102023-11-20T16:35:25ZengMDPI AGMaterials1996-19442020-10-011320449410.3390/ma13204494Recession of Environmental Barrier Coatings under High-Temperature Water Vapour Conditions: A Theoretical ModelPeng Jiang0Cheng Ye1State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, ChinaRare-earth disilicates are the major material used on the top layer of environmental barrier coating (EBC) systems. Although rare-earth disilicates are highly resistant to water vapour, corrosion due to water vapour at high temperature is still one of the main reasons of failure of EBC systems. In this study, a corrosion model of ytterbium disilicates in water vapour at high temperature was derived, based on the gas diffusion theory. Using this theoretical model, we studied the evolution rule of the corroded area on the top layer of the EBC under gas flow at high temperature. The influence of the various parameters of the external gas on the corrosion process and the corrosion kinetics curve were also discussed. The theoretical model shows that the increase in gas temperature, gas flow velocity, water partial pressure, and total gas pressure accelerate coating corrosion. Among these factors, the influence of total gas pressure on the corrosion process is relatively weak, and the effect of the continuous increase of the gas velocity on the corrosion process is limited. The shape of the corrosion kinetics curve is either a straight or parabolic, and it was determined by a combination of external gas parameters.https://www.mdpi.com/1996-1944/13/20/4494environmental barrier coatinghigh-temperature water-vapour recessionytterbium disilicates |
| spellingShingle | Peng Jiang Cheng Ye Recession of Environmental Barrier Coatings under High-Temperature Water Vapour Conditions: A Theoretical Model Materials environmental barrier coating high-temperature water-vapour recession ytterbium disilicates |
| title | Recession of Environmental Barrier Coatings under High-Temperature Water Vapour Conditions: A Theoretical Model |
| title_full | Recession of Environmental Barrier Coatings under High-Temperature Water Vapour Conditions: A Theoretical Model |
| title_fullStr | Recession of Environmental Barrier Coatings under High-Temperature Water Vapour Conditions: A Theoretical Model |
| title_full_unstemmed | Recession of Environmental Barrier Coatings under High-Temperature Water Vapour Conditions: A Theoretical Model |
| title_short | Recession of Environmental Barrier Coatings under High-Temperature Water Vapour Conditions: A Theoretical Model |
| title_sort | recession of environmental barrier coatings under high temperature water vapour conditions a theoretical model |
| topic | environmental barrier coating high-temperature water-vapour recession ytterbium disilicates |
| url | https://www.mdpi.com/1996-1944/13/20/4494 |
| work_keys_str_mv | AT pengjiang recessionofenvironmentalbarriercoatingsunderhightemperaturewatervapourconditionsatheoreticalmodel AT chengye recessionofenvironmentalbarriercoatingsunderhightemperaturewatervapourconditionsatheoreticalmodel |