喷涂工艺对Ta2O5原位复合钽基纳米晶涂层微观结构及摩擦磨损性能的影响

doi:10.11900/0412.1961.2020.00242

金属学报

2021, Vol. 57

Issue (2): 237-246 DOI: 10.11900/0412.1961.2020.00242

研究论文

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喷涂工艺对Ta₂O₅原位复合钽基纳米晶涂层微观结构及摩擦磨损性能的影响

李晓倩¹^,², 王富国¹, 梁爱民¹^,²(

)

^1.中国科学院兰州化学物理研究所材料磨损与防护重点实验室兰州 730000
^2.中国科学院大学材料与光电研究中心北京 100049

Effect of Spraying Process on Microstructure and Tribological Properties of Ta₂O₅ In Situ Composite Nanocrystalline Ta-Based Coatings

LI Xiaoqian¹^,², WANG Fuguo¹, LIANG Aimin¹^,²(

)

^1.Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
^2.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

引用本文:

李晓倩, 王富国, 梁爱民. 喷涂工艺对Ta₂O₅原位复合钽基纳米晶涂层微观结构及摩擦磨损性能的影响[J]. 金属学报, 2021, 57(2): 237-246.
Xiaoqian LI, Fuguo WANG, Aimin LIANG. Effect of Spraying Process on Microstructure and Tribological Properties of Ta₂O₅ In Situ Composite Nanocrystalline Ta-Based Coatings[J]. Acta Metall Sin, 2021, 57(2): 237-246.

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摘要:

采用大气等离子喷涂制备了Ta₂O₅原位复合钽基纳米晶涂层，利用SEM、微束XRD、微动摩擦磨损实验机及非接触三维表面轮廓仪等技术手段并结合计算分析，考察了喷涂功率、主气(Ar)流量等对钽基涂层表面Ta₂O₅含量、晶粒尺寸、显微硬度和摩擦磨损性能等的影响规律及原因。在考察范围内，随喷涂功率增大，钽基涂层表面Ta₂O₅含量呈先减小后增大的变化，而涂层表面α-Ta的晶粒尺寸及点阵畸变则均呈先增大后减小的变化；随Ar气流量增大，涂层表面Ta₂O₅含量总体呈减小趋势，在流量为2.17×10^-3~2.33×10^-3 m³/s时达到最低，α-Ta的晶粒尺寸与点阵畸变的变化呈负相关性；采用间断喷涂方法时涂层表面Ta₂O₅含量降低，α-Ta晶粒尺寸及点阵畸变均略有减小。通过对喷涂相关微观过程特点的分析，对这些规律作了阐释。涂层的显微硬度与其表面Ta₂O₅含量相关，高硬度涂层的表面Ta₂O₅含量相对较低；干摩擦条件下晶粒较大、Ta₂O₅含量较少的涂层抵御硬质陶瓷低速刻划的能力较差；边界润滑状态下硬度较高的涂层表现出更优的抗磨减摩性能；采取间断喷涂可获得摩擦学性能最佳的涂层。钽基涂层的机械性能与其微观结构特征显著相关；除显微硬度外，涂层晶粒尺寸、点阵畸变及表面Ta₂O₅含量的相对值可用作质量控制的重要指标。

关键词 ：钽基涂层, 纳米晶, 等离子喷涂, Ta₂O₅, 晶粒尺寸, 磨损率

Abstract：

In the fields of aviation, aerospace, and military, Ta-based coatings are of wide prospects in applications owing to their remarkable characteristics. Compared with other preparation methods, plasma spraying has obvious technical advantages in preparing Ta-based coatings. In this work, Ta₂O₅ in situ composite nanocrystalline Ta-based coatings via plasma spraying were fabricated. Effects of the spraying power, main gas (Ar) flow rate, and spraying mode on the fine surface microstructure and friction, as well as on the wear properties of Ta-based coatings, were investigated using several techniques. Such techniques included SEM, micro-beam XRD, fretting friction and wear test, and computational analysis. Moreover, related rules and causes were discussed. Results indicated that the Ta₂O₅ content at the surface of Ta-based coatings initially decreased and then increased with an increase in the spraying power. Conversely, the crystal size and lattice distortion of α-Ta at the coating surface initially increased and then decreased. With an increase in the Ar flow rate, the Ta₂O₅ content decreased in general and reached the lowest value when the flow rate was 2.17×10^-3-2.33×10^-3 m³/s. A negative correlation between the variation of the crystal size and lattice distortion with Ar flow rate has been observed. The Ta₂O₅ content, crystal size, and lattice distortion slightly decreased due to intermittent spraying. Moreover, a significant correlation between the Ta₂O₅ content and coating microhardness was observed. Under dry friction, the wear rate is closely related to both the oxide content and crystal size. Low oxide content and large crystal size results in high wear rate. Under boundary lubrication, coatings with higher levels of hardness exhibit better anti-wear and friction-reducing performance in the same series of Ta-based coatings. The coating exhibiting the best tribological properties can be achieved via intermittent spraying. Mechanical properties of Ta-based coating are significantly correlated with their fine microstructure characteristics. Aside from microhardness, the grain size, lattice distortion, and oxide content of the coatings can be utilized as important indexes to control the coating quality.

Key words： Ta-based coating nanocrystal plasma spraying Ta₂O₅ crystal size wear rate

收稿日期: 2020-07-22

ZTFLH:

TG178

基金资助:装备预先研究项目(培育项目)(0711)

作者简介: 李晓倩，女，1996年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00242 或 https://www.ams.org.cn/CN/Y2021/V57/I2/237

表1 钽基涂层等离子喷涂的主要工艺参数

图1 金属Ta粉末的SEM像、EDS和XRD谱

图2 钽基涂层的XRD谱

图3 No.1~No.7钽基涂层表面形貌的SEM像

图4 No.1~No.7钽基涂层的表面粗糙度

图5 钽基涂层表面的微束XRD谱和各涂层的ITa2O5(001)/ITa(110)

表2 No.1~No.7钽基涂层表面2种物相XRD峰的强度比

图6 钽基涂层表面α-Ta的晶粒尺寸与点阵畸变随喷涂功率的变化和喷涂功率改变时晶粒尺寸与点阵畸变的正相关性，以及二者随Ar气流量和喷涂方式的变化

图7 钽基涂层的平均显微硬度柱状图及涂层平均显微硬度与表面Ta2O5含量随喷涂功率、Ar气流量和喷涂方式的变化

图8 干摩擦及石蜡润滑条件下No.1~No.7钽基涂层摩擦系数随时间变化曲线

表3 No.1~No.7钽基涂层的平均摩擦系数

图9 在干摩擦及石蜡润滑条件下钽基涂层磨损率随喷涂工艺的变化

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