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An investigation on erosion behavior of HVOF sprayed WC-CoCr coatings

机译：HVOF喷涂WC-CoCr涂层的腐蚀行为研究

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摘要

Present work is an investigation of slurry erosion behavior of WC-CoCr cermet coatings deposited with two different WC grain sizes. HVOF thermal spray process was employed due to its high velocity and low flame temperature characteristics resulting in quality coating. HVOF spraying was assisted with in-flight particle temperature and velocity measurement system to control its heating. Slurry erosion testing was performed using a pot-type slurry erosion tester to evaluate slurry erosion resistance of the coatings. Two parameters were considered for testing viz. erodent particle size and slurry concentration. Surface morphology was examined using SEM images and phase identification was done by XRD. The erosion behavior and mechanism of material removal was studied and discussed based on microstructural examination. It was observed that WC-CoCr cermet coating deposited with fine grain WC exhibits higher slurry erosion resistance under all testing conditions as compared to conventional cermet coating.
机译：目前的工作是研究以两种不同的WC粒度沉积的WC-CoCr金属陶瓷涂层的浆液侵蚀行为。采用HVOF热喷涂工艺，因为它具有高速度和低火焰温度特性，从而可产生高质量的涂层。 HVOF喷涂借助飞行中粒子温度和速度测量系统辅助控制其加热。使用罐型浆料侵蚀测试仪进行浆料侵蚀测试，以评估涂层的耐浆料侵蚀性。考虑了两个参数进行测试。侵蚀的粒度和浆液浓度。使用SEM图像检查表面形态，并通过XRD进行相鉴定。在微观结构检验的基础上，研究了材料的腐蚀行为和去除材料的机理。观察到，与常规金属陶瓷涂层相比，用细颗粒WC沉积的WC-CoCr金属陶瓷涂层在所有测试条件下均表现出更高的抗浆液侵蚀性。

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  • 来源
    《Applied Surface Science》 |2011年第3期|p.1225-1234|共10页
  • 作者

    Lalit Thakur; N. Arora; R. Jayaganthan; R. Sood;

  • 作者单位

    Mechanical and Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee 247667, India;

    Mechanical and Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee 247667, India;

    Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India;

    M/s. Industrial Processors and Metallizers PvL Ltd. (IPM), Delhi 110099, India;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    WC-CoCr; HVOF; cermet; slurry erosion; nanostructured;

    机译：WC-CoCr;HVOF;金属陶瓷泥浆侵蚀纳米结构;

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