研究了溅射Co-30Cr-6Al-0.5Y涂层中缺陷对涂层抗高温氧化,热腐蚀及热疲劳性能的影响。结果表明:在氧化条件下,缺陷导致Al的内氧化,在1100℃时,由于Al的大量内消耗,涂层表面已不能形成单一的氧化铝膜,使氧化性能下降;在热腐蚀条件下,缺陷成为硫向涂层中扩散的通道,导致涂层及基体的硫化;在冷热疲劳条件下,缺陷成为裂纹源,在交变应力作用下,裂纹向基体中扩展,降低了涂层的热疲劳性能。
Influence of defects on oxidation, hot corrosion and thermal shock properties of sputtered Co-30Cr- 6Al-0.5Y coatings was investigated. In the coating, the nodular defect was observed to worsen severely the properties. For testing under oxidation condition, the nodular defect results in the internal oxidation of Al. No single Al oxide scale may be formed at 1100℃ owing to consumption of Al. Under hot corrosion, it becomes as short-path for diffusion of S through the coating, thus sulphuring the coating together with the substrate. During thermal shock testing, it may act as the source of cracking, and moreover, if cyclic stress applied, the cracks propagate toward the substrate, the thermal fatigue properties of coating will be worsened.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] |
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