YSZ-Ti3AlC2热障涂层及其高温自愈合行为

doi:10.15541/jim20170101

摘要/Abstract

摘要：

采用Ti₃AlC₂作为新型自愈合剂, 利用大气等离子喷涂将混合均匀的YSZ-Ti₃AlC₂粉体制成厚涂层。为观测高温下涂层氧化及裂纹的自愈合行为, 通过外加载荷的方式在涂层表面预制裂纹, 并将样品置于1050℃空气气氛中进行热处理。通过分析涂层制备、热处理前后的物相和形貌演变发现：涂层中的部分Ti₃AlC₂在喷涂后分解为TiC, 热处理后涂层表面形成外层为TiO₂, 内层为TiO₂和Al₂O₃混合物的双层结构。在自愈合过程中, 裂纹内的愈合剂氧化生成Al₂O₃与低密度的TiO₂, 随着扩散控制的氧化反应不断进行, 氧化物逐渐积累并填补裂纹。此外, 在TiO₂生成的同时引起的体积膨胀使裂纹周围产生一定的压应力, 强化愈合效果, 最终完全愈合裂纹。

关键词: 热障涂层, 等离子喷涂, 自愈合

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

中图分类号:

TQ174

孙旭轩, 陈宏飞, 杨光, 刘斌, 高彦峰. YSZ-Ti₃AlC₂热障涂层及其高温自愈合行为[J]. 无机材料学报, 2017, 32(12): 1269-1274.

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.

图/表 11

表1 大气等离子喷涂参数

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

图1 YSZ粉末(a)和YSZ-Ti3AlC2喷涂粉末(b)的SEM照片, (c)YSZ-Ti3AlC2喷涂粉末粒径分布图

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

图2 (a)预制裂纹制备示意图和(b)预制裂纹形貌图

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

图3 YSZ-Ti3AlC2喷涂粉末(a), 喷涂后涂层(b)和涂层在1050℃等温热处理4 h(c)的XRD图谱

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

图4 热喷涂后涂层表面形貌(a), 1050℃等温热处理4 h后涂层表面形貌(b)和(b)图方框区域的局部放大图(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)

图5 涂层经1050℃热处理4 h后表面元素扫描分析图谱

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

图6 热处理后涂层截面的背散射扫描电镜照片

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

表2 图6中各标记点的元素分析

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

图7 YSZ-Ti3AlC2涂层在空气中1050℃热处理4 h后裂纹处的表面形貌(a)和愈合区的元素分析(b)

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)

图8 自愈合过程示意图

Fig. 8 Schematic diagram of self-healing process

图9 YSZ-Ti3AlC2涂层的TG-DTA曲线

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

参考文献 16

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YSZ-Ti₃AlC₂热障涂层及其高温自愈合行为

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

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