High-Temperature Oxidation Resistance Mechanism and Thermal Shock Performance of CoCrTaAlY/YSZ Thermal Barrier Coatings Fabricated Using Plasma Spraying and Laser Cladding

Zhenjie Gu; Jianbo Lei; Junya Dou; Jinbo Guo

doi:10.3788/CJL201946.0802007

Chinese Journal of Lasers, Volume. 46, Issue 8, 0802007(2019)

High-Temperature Oxidation Resistance Mechanism and Thermal Shock Performance of CoCrTaAlY/YSZ Thermal Barrier Coatings Fabricated Using Plasma Spraying and Laser Cladding

Zhenjie Gu^*, Jianbo Lei^*, Junya Dou, and Jinbo Guo

Author Affiliations

Laser Technology Institute, Tianjin Polytechnic University, Tianjin 300387, China

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Figures & Tables(13)

Fig. 1. Surface morphologies of samples. (a) Bonding layer after turning; (b) YSZ ceramic layer after plasma spraying

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Fig. 2. XRD spectra of YSZ ceramic layer surface before and after high-temperature oxidation

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Fig. 3. SEM morphologies of TBCs' cross-section after high-temperature oxidation for 100 h at 900 ℃. (a) Bonding zone ofCoCrTaAlY and 1Cr13; (b) bonding zone of YSZ and CoCrTaAlY; (c) local magnification of bonding zone of YSZ and CoCrTaAlY

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Fig. 4. Element line-scan distribution of TBC

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Fig. 5. Dynamics curves of high-temperature oxidation of TBCs

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Fig. 6. Fitting curves of weight gain rates of three coatings during high-temperature oxidation

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Fig. 7. Macroscopic morphologies of TBCs after thermal shock

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Fig. 8. XRD spectra of TBCs after thermal shock

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Fig. 9. SEM morphologies of TBCs after thermal shock. (a) Morphology of surface; (b) locally magnified morphology; (c) morphology of cross-section and line-scan results

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Table 1. Chemical compositions of 1Cr13 steel substrate
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Table 1. Chemical compositions of 1Cr13 steel substrate
Element C Si Mn Cr Ni S P Fe
Mass fraction /% ≤0.15 ≤1.0 ≤1.0 11.5-13.5 ≤0.06 ≤0.03 ≤0.035 Bal.

Table 2. Chemical compositions of CoCrTaAlY alloy powder
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Table 2. Chemical compositions of CoCrTaAlY alloy powder
Element Cr Al Y Ta Si C Co
Mass fraction /% 23.01 8.49 1.09 8.81 0.83 2.28 Bal.

Table 3. EDS analysis results of cladding layer
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Table 3. EDS analysis results of cladding layer
Area Mass fraction /%
O Al Si Cr Fe Co Ta Y Zr
A0 0.73 1.46 22.57 7.48 1.95 3.85 61.10 0.86 -
A1 11.43 9.66 0.51 27.70 25.70 17.13 7.69 0.18 -
A2 29.81 16.93 0.96 22.49 8.44 7.69 3.77 - 9.91
A3 30.62 0.93 - - - - - - 68.45

Table 4. Kp and average relative errors δ- of three coatings
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Table 4. Kp and average relative errors δ- of three coatings
Coating K_p /(g²·cm^-4·h^-1) $\begin{matrix} \bar{δ} \end{matrix}$ /%
1Cr13 0.0038 1.63
CoCrTaAlY 0.0028 5.77
YSZ 0.0024 7.04

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Zhenjie Gu, Jianbo Lei, Junya Dou, Jinbo Guo. High-Temperature Oxidation Resistance Mechanism and Thermal Shock Performance of CoCrTaAlY/YSZ Thermal Barrier Coatings Fabricated Using Plasma Spraying and Laser Cladding[J]. Chinese Journal of Lasers, 2019, 46(8): 0802007

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