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| Effect of Al Coating Repair on Properties of DD5 Alloy |
| Received:May 12, 2020 Revised:June 24, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.11.017 |
| KeyWord:Al coating CVD DD5 alloy removing and recoating chemical method |
| Author | Institution |
| CAI Yan |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, AECC, Beijing , China |
| LI Jian-ping |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, AECC, Beijing , China |
| TANG Zhi-hui |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, AECC, Beijing , China |
| MU Ren-de |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, AECC, Beijing , China |
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| Abstract: |
| The work aims to observe the effect of Al coating repair on properties of DD5 alloy. Al coatings were deposited on the DD5 single crystal alloy substrate by CVD. The coatings on the substrate were fully removed via chemical methods. The high temperature thermal shock test was carried out at 1100 ℃ through HB 5258. The thermal adhesion of coatings was assessed through mass change during test. Through mechanical experiments such as high-temperature durability and high-temperature instantaneous tension, the influence of coating removal and recoating on the mechanical properties of substrate alloy was evaluated. The coatings before and after removal were characterized by scanning electron microscopy. The microstructure and elements at Al coating/DD5 alloy interface did not change after removal for 60 min in removing solution. The Al coatings after removal and recoating were tested at 1100 ℃ under the condition of “air cooling”, and when the thermal shock times were more than 2000, there was no obvious coating spalling on the surface of the coating sample. Coating removal and recoating had no obvious influence on the mechanical properties of the alloy. Al coating repair apparently has no effect on properties of DD5 alloy. |
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