Effect of Heat-treatment Temperature on Thermal and Mechanical Properties of LaMgAl11O19 Coating

doi:10.15541/jim20210720

Abstract

Abstract:

LaMgAl₁₁O₁₉ (LMA) coating prepared by atmospheric plasma spraying has large amounts of amorphous phase, which seriously affects the service life of coating. Effects of microstructure, such as grain size, porosity and amorphous phase content, on mechanical, thermophysical and thermal shock resistance properties of LMA coatings after heat-treatement at 900-1600 ℃ for 12 h were investigated. The results show that the as-sprayed LMA coating possesses two crystallization temperature points, 900 and 1163 ℃. After heat-treatement at 900 ℃, the lowest thermal diffusivity of 0.53 mm²/s was obtained for LMA coating at 1000 ℃ due to the large amount of amorphous phase and the highest porosity of (18.88±2.15)%. LMA coatings, heat-treated at 1100-1400 ℃, exhibited higher hardness owing to reduced amorphous content and porosity through recrystallization and sintering with the maximum hardness of (12.08±0.58) GPa at 1100 ℃. After heat-treatement at 1300 ℃, the coating displayed the highest average thermal cycling life (588 times), which attributed to abundant micron flake crystals with high strain tolerance. When the heat-treatment temperature reached 1500 ℃, the grain thickness increased rapidly due to parallel stacking of lamellar crystals, porosity increased and mechanical properties significantly decreased. During the thermal shock, grain breaking and crack propagation occurred in the coating due to the repeated thermal stress, resulting in final failure of the coating.

Key words: LaMgAl₁₁O₁₉, thermal barrier coating, heat-treatment, thermal and mechanical property

CLC Number:

TB306

AN Wenran, HUANG Jingqi, LU Xiangrong, JIANG Jianing, DENG Longhui, CAO Xueqiang. Effect of Heat-treatment Temperature on Thermal and Mechanical Properties of LaMgAl₁₁O₁₉ Coating[J]. Journal of Inorganic Materials, 2022, 37(9): 925-932.

Figures/Tables 14

Fig. 1 SEM image of LMA powder

Table 1 Parameters of air plasma spraying

Coating	Spray distance/mm	Power/kW	Current/A	Plasma gas Ar/H₂/slpm*	Gun velocity/(mm∙s^-1)	Feeding rate/(g∙min^-1)
LMA	100	42	620	35/12	800	35

Fig. 2 DSC curve of LMA coating prepared by APS

Fig. 3 XRD patterns of LMA coatings after heat-treatement at different temperatures (a) Lrt, L900, L1100; (b) L1200, L1300, L1400, L1500, and L1600; (c) Local magnification XRD patterns at 2θ between 33.5°-37° of (b)

Fig. 4 Fractured cross-section morphologies of LMA coatings after heat-treatement at different temperatures (a) Lrt; (b) L900; (c) L1100; (d) L1200; (e) L1300; (f) L1400; (g) L1500; (h) L1600

Fig. 5 Activation energy of grain growth

Fig. 6 Cross-sectional morphologies of LMA coatings after heat-treatement at different temperatures (a) Lrt; (b) L900; (c) L1100; (d) L1200; (e) L1300; (f) L1400; (g) L1500; (h) L1600

Fig. 7 Density and porosity of coatings after heat-treatement at different temperatures

Fig. 8 Vickers hardness of coatings after heat-treatement at different temperatures

Fig. 9 Thermophysical properties of coatings after heat-treatement at different temperatures (a) Thermal diffusivity; (b) Thermal conductivity

Fig. 10 Comparisons of XRD patterns of coatings before and after thermal shock (a) Lrt and Lsrt; (b) L900 and Ls900; (c) L1300 and Ls1300; (d) L1600 and Ls1600

Fig. 11 Fractured cross-sectional morphologies of coatings before and after thermal shock (a) Lrt; (a′) Lsrt; (b) L900; (b′) Ls900; (c) L1300; (c′) Ls1300; (d) L1600; (d′) Ls1600

Table 2 Vickers hardness of coatings before and after thermal shock

H_V/GPa	L_rt	L₉₀₀	L₁₃₀₀	L₁₆₀₀
Before	6.61	6.56	11.08	6.76
After	10.12	10.89	12.07	11.01

Fig. 12 (a-c) Fractured cross-section morphologies and (d) XRD patterns of L1600 heat-treatement at different conditions (a) L1600; (b) Ls1600; (c) Ls1600-1525

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Effect of Heat-treatment Temperature on Thermal and Mechanical Properties of LaMgAl₁₁O₁₉ Coating

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