YSZ- Ti3AlC2 Thermal Barrier Coating and Its Self-healing Behavior under High Temperatures

doi:10.15541/jim20170101

Abstract

Abstract:

Ti₃AlC₂ acting as a new self-healing agent was added into yttria-stabilized zirconia (YSZ) thermal barrier coatings. By atmospheric plasma spraying (APS), thick coatings were prepared using YSZ-Ti₃AlC₂mixing powder. To observe oxidation and self-healing behavior, cracks were prefabricated on the surface of YSZ-Ti₃AlC₂ coating by uniform external load. The prepared samples were then isothermal treated at 1050℃ in air. The phase and morphology evolution of the coatings, as well as the self-healing behavior were investigated via several analyzing methods. The results showed that a part of Ti₃AlC₂ was decomposed into TiC after spraying and a double layered structure composed of a TiO₂ outer layer and a TiO₂+Al₂O₃ inner layer was formed after isothermal treatment. In the process of self-healing, oxidation of the healing agent in the coating led to the growth of alumina and low-density titanium oxide in the cracks. These oxides gradually filled the cracks due to the diffusion-controlled oxidation. Meanwhile, the compressive stress induced by the volume expansion of TiO₂ growth in the crack enhanced the healing effect. And eventually the prefabricated cracks were healed.

Key words: thermal barrier coatings, atmospheric plasma spraying, self-healing

CLC Number:

TQ174

SUN Xu-Xuan, CHEN Hong-Fei, YANG Guang, LIU Bin, GAO Yan-Feng. YSZ- Ti₃AlC₂ Thermal Barrier Coating and Its Self-healing Behavior under High Temperatures[J]. Journal of Inorganic Materials, 2017, 32(12): 1269-1274.

Figures/Tables 11

Table 1 Parameters of atmospheric plasma spraying

Parameter	Current/A	Ar/NLPM	H₂/ NLPM	Spraying distance/mm	Carrier Ar/NLPM
Value	550	50	8	150	3.2

Fig. 1 SEM images of YSZ powder (a) and YSZ-Ti3AlC2 powder (b), particle size distribution (c) of YSZ-Ti3AlC2 powder

Fig. 2 (a)Schematic diagram of prefabricating cracks and (b) image of prefabricated crack

Fig. 3 XRD patterns of YSZ-Ti3AlC2 powder(a), as-sprayed coating(b) and coating after isothermal treatment at 1050℃ for 4 h(c)

Fig. 4 SEM images of as-sprayed coating surface(a), coating surface after isothermal treated at 1050℃ for 4 h (b) with enlarged view (c) of square area in Fig. 4 (b)

Fig. 5 Element analysis on the surface of coating after isothermal treatment at 1050℃ for 4 h^(a) Al map; (b) Ti map; (c) O map; (d) Zr map

Fig. 6 BSE image of cross section morphology of the coating after isothermal treatment

Table 2 EDS analysis of the points in Fig. 6

Spot	Al	Ti	Zr	O
Spot	at%
A	0	5.84	27.31	66.85
B	4.14	9.54	24.49	61.83
C	10.07	16.58	14.51	58.84
D	13.84	18.12	6.31	61.73
E	2.46	30.89	4.78	61.87
F	0.56	34.46	0.52	64.76

Fig. 7 (a) Surface morphology of prefabricated crack in YSZ-Ti3AlC2 coating after isothermal treatment at 1050℃ in the air for 4 h and (b) EDS image of self-healing zone in Fig. 7(a)

Fig. 8 Schematic diagram of self-healing process

Fig. 9 TG-DTA curves of as-sprayed YSZ-Ti3AlC2 coating

References 16

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YSZ- Ti₃AlC₂ Thermal Barrier Coating and Its Self-healing Behavior under High Temperatures

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