Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors
Thermally grown oxide (TGO), commonly pure α-Al2O3, formed on protective coatings acts as an insulation barrier shielding cooled reactors from high temperatures in nuclear energy systems. Mixed zone (MZ) oxide often grows at the interface between the alumina layer and top coat in thermal barrier coa...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2016-01-01
|
| Series: | Science and Technology of Nuclear Installations |
| Online Access: | http://dx.doi.org/10.1155/2016/9071237 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849691545149636608 |
|---|---|
| author | Jian Wang Jun Ding Kun Song Song Chen Xia Huang |
| author_facet | Jian Wang Jun Ding Kun Song Song Chen Xia Huang |
| author_sort | Jian Wang |
| collection | DOAJ |
| description | Thermally grown oxide (TGO), commonly pure α-Al2O3, formed on protective coatings acts as an insulation barrier shielding cooled reactors from high temperatures in nuclear energy systems. Mixed zone (MZ) oxide often grows at the interface between the alumina layer and top coat in thermal barrier coatings (TBCs) at high temperature dwell times accompanied by the formation of alumina. The newly formed MZ destroys interface integrity and significantly affects the displacement instabilities of TGO. In this work, a finite element model based on material property changes was constructed to investigate the effects of MZ on the displacement instabilities of TGO. MZ formation was simulated by gradually changing the metal material properties into MZ upon thermal cycling. Quantitative data show that MZ formation induces an enormous stress in TGO, resulting in a sharp change of displacement compared to the alumina layer. The displacement instability increases with an increase in the MZ growth rate, growth strain, and thickness. Thus, the formation of a MZ accelerates the failure of TBCs, which is in agreement with previous experimental observations. These results provide data for the understanding of TBC failure mechanisms associated with MZ formation and of how to prolong TBC working life. |
| format | Article |
| id | doaj-art-e1a62d3619ee4320948decc07f8b979e |
| institution | DOAJ |
| issn | 1687-6075 1687-6083 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Science and Technology of Nuclear Installations |
| spelling | doaj-art-e1a62d3619ee4320948decc07f8b979e2025-08-20T03:20:59ZengWileyScience and Technology of Nuclear Installations1687-60751687-60832016-01-01201610.1155/2016/90712379071237Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast ReactorsJian Wang0Jun Ding1Kun Song2Song Chen3Xia Huang4College of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, ChinaCollege of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, ChinaCollege of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, ChinaCollege of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, ChinaCollege of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, ChinaThermally grown oxide (TGO), commonly pure α-Al2O3, formed on protective coatings acts as an insulation barrier shielding cooled reactors from high temperatures in nuclear energy systems. Mixed zone (MZ) oxide often grows at the interface between the alumina layer and top coat in thermal barrier coatings (TBCs) at high temperature dwell times accompanied by the formation of alumina. The newly formed MZ destroys interface integrity and significantly affects the displacement instabilities of TGO. In this work, a finite element model based on material property changes was constructed to investigate the effects of MZ on the displacement instabilities of TGO. MZ formation was simulated by gradually changing the metal material properties into MZ upon thermal cycling. Quantitative data show that MZ formation induces an enormous stress in TGO, resulting in a sharp change of displacement compared to the alumina layer. The displacement instability increases with an increase in the MZ growth rate, growth strain, and thickness. Thus, the formation of a MZ accelerates the failure of TBCs, which is in agreement with previous experimental observations. These results provide data for the understanding of TBC failure mechanisms associated with MZ formation and of how to prolong TBC working life.http://dx.doi.org/10.1155/2016/9071237 |
| spellingShingle | Jian Wang Jun Ding Kun Song Song Chen Xia Huang Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors Science and Technology of Nuclear Installations |
| title | Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors |
| title_full | Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors |
| title_fullStr | Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors |
| title_full_unstemmed | Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors |
| title_short | Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors |
| title_sort | effects of a mixed zone on tgo displacement instabilities of thermal barrier coatings at high temperature in gas cooled fast reactors |
| url | http://dx.doi.org/10.1155/2016/9071237 |
| work_keys_str_mv | AT jianwang effectsofamixedzoneontgodisplacementinstabilitiesofthermalbarriercoatingsathightemperatureingascooledfastreactors AT junding effectsofamixedzoneontgodisplacementinstabilitiesofthermalbarriercoatingsathightemperatureingascooledfastreactors AT kunsong effectsofamixedzoneontgodisplacementinstabilitiesofthermalbarriercoatingsathightemperatureingascooledfastreactors AT songchen effectsofamixedzoneontgodisplacementinstabilitiesofthermalbarriercoatingsathightemperatureingascooledfastreactors AT xiahuang effectsofamixedzoneontgodisplacementinstabilitiesofthermalbarriercoatingsathightemperatureingascooledfastreactors |