Abstract
The laser remelting treatment of plasma sprayed ZrO 2-NiCoCrAlY graded coating on TC4(Ti-6Al4V) alloy substrate was investigated. In order to maintain the gradual composition distribution, the laser remelted zone was controlled in ZrU 2 top layer. Laser remelting treatment diminished the pores in the ZrO 2 top layer and resulted in a dense microstructure. Compared with the unmelted coating, the ZrO 2 melted zone had a higher micro-hardness and a more excellent oxidation resistance. However, owing to the graded coating being heated and cooled unevenly by the laser beam, a serious residual thermal stress was produced in the coating. Laser remelting distorted the ZrO 2 grains, some coarse cracks were formed in the coating, and the adherence strength between ZrO 2 top layer and graded layers was weakened. As a result, the thermal shock property of the graded coating was worsen.
| Original language | English |
|---|---|
| Pages (from-to) | 177-178 |
| Number of pages | 2 |
| Journal | Journal of the Chinese Society of Corrosion and Protection |
| Volume | 19 |
| Issue number | 3 |
| State | Published - 1999 |
| Externally published | Yes |
Keywords
- Anti-oxidation property
- Laser treatment
- Plasma sprayed coating
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