液相等离子喷涂SrZrO<sub>3</sub>热障涂层工艺的研究

doi:10.11902/1005.4537.2016.172

中国腐蚀与防护学报

2017, Vol. 37

Issue (1): 41-46 DOI: 10.11902/1005.4537.2016.172

研究报告

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液相等离子喷涂SrZrO₃热障涂层工艺的研究

李新慧^1,²,马文^1,²(

),尹轶川^1,²,马伯乐^1,²,白玉^1,²,贾瑞灵^1,²,董红英^2,³

1 内蒙古工业大学材料科学与工程学院呼和浩特 010051
2 内蒙古工业大学内蒙古自治区薄膜与涂层重点实验室呼和浩特 010051
3 内蒙古工业大学化工学院呼和浩特 010051

Optimization of Preparation Process of Solution Precursor Plasma Spraying for SrZrO₃ Thermal Barrier Coating

Xinhui LI^1,²,Wen MA^1,²(

),Yichuan YIN^1,²,Bole MA^1,²,Yu BAI^1,²,Ruiling JIA^1,²,Hongying DONG^2,³

1 School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
2 Inner Mongolia Key Laboratory of Thin Film and Coatings Technology, Inner Mongolia University of Technology,Hohhot 010051, China
3 School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China

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摘要:

采用液相等离子喷涂 (SPPS) 方法制备了SrZrO₃热障涂层 (TBCs) 。采用田口实验法 (Taguchi method) 研究了喷涂电流、氩气流量、氢气流量等主要喷涂工艺参数对涂层沉积效率、硬度、显微结构、相稳定性的影响规律。分别采用XRD,SEM和显微硬度计研究了涂层的相组成、显微结构和硬度。结果表明：在喷涂距离、送液速率、雾化压力一定的情况下,当喷枪电流为600 A、氩气流量为40 L/min、氢气流量为10 L/min条件下,涂层的沉积效率最高,熔化程度最好,单遍喷涂厚度达到6.0 μm,涂层孔隙率为16.3%,硬度为6.8 GPa。相稳定性研究表明,1450 ℃下随着热处理时间的延长,涂层中t-ZrO₂相逐渐向m-ZrO₂相转变,SrZrO₃相稳定性良好。

关键词 ：液相等离子喷涂, 热障涂层, SrZrO₃, 田口实验法

Abstract：

SrZrO₃ thermal barrier coating was prepared by solution precursor plasma spraying (SPPS). Corresponding to Taguchi method, the relevant processing parameters were optimized in terms of the deposition efficiency, microhardness, microstructure and phase stability of the prepared coatings. The phase constitutes, microstructure and microhardness of the coatings were characterized by XRD, SEM and a microhardness tester, respectively. The experimental results showed that, in the case that the spray distance, feedstock flow rate and atomization pressure are given, the optimized spray parameters were set as follows: arc current, 600 A; argon flow rate, 40 L/min; hydrogen flow rate, 10 L/min. The SrZrO₃ coating prepared with the optimized spray parameters had a single-pass coating thickness of 6.0 μm, porosity of 16.3%, and microhardness of 6.8 GPa. The results of phase stability analysis indicated that, the phase transition from t-ZrO₂ to m-ZrO₂ in the SrZrO₃ coating emerged gradually at 1450 ℃ with increasing time, while the SrZrO₃ phase did not change.

Key words： solution precursor plasma spraying thermal barrier coating SrZrO₃ Taguchi method

收稿日期: 2016-09-18

基金资助:国家自然科学基金 (51462026和51672136) 及内蒙古自然科学基金 (2014MS0509)

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引用本文:

李新慧,马文,尹轶川,马伯乐,白玉,贾瑞灵,董红英. 液相等离子喷涂SrZrO₃热障涂层工艺的研究[J]. 中国腐蚀与防护学报, 2017, 37(1): 41-46.
Xinhui LI, Wen MA, Yichuan YIN, Bole MA, Yu BAI, Ruiling JIA, Hongying DONG. Optimization of Preparation Process of Solution Precursor Plasma Spraying for SrZrO₃ Thermal Barrier Coating. Journal of Chinese Society for Corrosion and protection, 2017, 37(1): 41-46.

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https://www.jcscp.org/CN/10.11902/1005.4537.2016.172 或 https://www.jcscp.org/CN/Y2017/V37/I1/41

表1 按照田口实验设计的可调节喷涂工艺参数

图1 不同工艺制备的SrZrO3涂层的XRD谱

图2 SrZrO3涂层在1450 ℃下热处理不同时间后的XRD谱

图3 4种不同工艺下所制备的SrZrO3涂层的截面形貌

图4 4种不同工艺所制备的SrZrO3涂层的表面形貌

图5 不同工艺对SrZrO3涂层沉积效率及显微硬度的影响

表2 喷涂参数对沉积效率影响的信噪比分析结果

表3 喷涂参数对涂层显微硬度影响的信噪比分析结果

图6 喷涂参数对涂层沉积效率与显微硬度影响的信噪比平均值趋势图

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