High Temperature Long-term Service Performance of TiAlCrY/YSZ Coating on TiAl Alloy

doi:10.15541/jim20220327

Abstract

Abstract:

TiAl alloy has excellent properties of low density and high specific strength, which is a potential structural material for aero-engine. The service temperature of TiAl alloy is limited in the range of 700-900 ℃, which is further improved by preparation of high temperature thermal protection coating. In the present work, a new type of TiAlCrY/YSZ coating was prepared on the TiAl alloy by plasma spray technologies, of which long-term service performance at high temperature was compared with the traditional NiCrAlY/YSZ coating. It was found that the TiAlCrY/YSZ coating remained intact after served 300 h at 1100 ℃ in the air, showing excellent high temperature performance, while the service lifetime of the NiCrAlY/YSZ coating at 1100 ℃ was less than 100 h. The microstructure observation found that a continuous and dense TGO composed of Al₂O₃ was continuously formed on the TiAlCrY bonding coating, suggesting that TiAlCrY coating has good interfacial compatibility with the YSZ top coating. Moreover, the thickness of TGO was still less than 8 μm after served 300 h at 1100 ℃ in the air. As compared with traditional NiCrAlY/YSZ coating, the TiAlCrY/YSZ coating is a more suitable high temperature thermal coating ever for TiAl alloys.

Key words: TiAl alloy, TiAlCrY/YSZ coating, plasma spray, high temperature long-term service performance

CLC Number:

TQ174

PAN Yangyang, LIANG Bo, HONG Du, QI Zhixiang, NIU Yaran, ZHENG Xuebin. High Temperature Long-term Service Performance of TiAlCrY/YSZ Coating on TiAl Alloy[J]. Journal of Inorganic Materials, 2023, 38(1): 105-112.

Figures/Tables 10

Table 1 Compositions of YSZ, TiAlCrY and NiCrAlY powders (%, in atom)

	Al	Cr	Y	Ti	Ni	Zr	O	Source
TiAlCrY	55.0	20.0	0.4	24.6	—	—	—	Nanjing University of Science and Technology
NiCrAlY	14.5	20.5	1.0	—	64.0	—	—	Institute of Metal Research, Chinese Academy of Sciences
YSZ	—	—	3.7	—	—	30.3	66.0	Sulzer Metco

Table 2 Spray parameters of YSZ, TiAlCrY and NiCrAlY coatings

Coating	Ar/slpm	H₂/slpm	Spray distance/mm	Feed rate/(r·min^-1)	Power/kW	Vacuum pressure/Pa
TiAlCrY/ NiCrAlY	30-40	5-15	200-300	15-30	30-40	1-3
YSZ	30-40	5-15	90-130	15-30	38-48	—

Fig. 1 Surface morphologies and XRD patterns of the as-sprayed YSZ (a-c) and TiAlCrY (d-f) coatings

Fig. 2 Diagram (a) and cross-sectional morphologies (b, c) of as-sprayed TiAlCrY/YSZ coating

Fig. 3 Cross-sectional morphologies (a, b) and EDS analyses (c, d) of TiAlCrY/YSZ coating after heat-treatment

Fig. 4 Cross-sectional morphologies and EDS results of TiAlCrY/YSZ coating after heat-treatment at 1100 ℃ for 100 h (a-d), 200 h (e-h) and 300 h (i-l)

Fig. 5 Cross-sectional morphologies (a, c, d) and EDS analyse (b) of TiAlCrY coating after heat-treatment at 1100 ℃ for 100 h

Fig. 6 Cross-sectional morphologies (a) and EBSD results (b, c) of NiCrAlY/YSZ coating after 100 h thermal-treatment at 1100 ℃. Colorful images are available on the website

Fig. 7 Thermal expansion coefficients (CTE) of YSZ coating, TiAl, TiAlCrY, and NiCrAlY alloys in the range of 100-1100 ℃

Fig. 8 EDS results (a) of IDZ and indentation morphologies of IDZ(b), NiCrAlY (c), and TiAlCrY (d) coatings under 4.9 N load

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