Scratch Adhesion Testing of Thick HVOF Thermal Sprayed Coatings

IF 3.2 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Journal of Thermal Spray Technology Pub Date : 2024-02-28 DOI:10.1007/s11666-024-01741-3

Maya M. Harfouche, Sima A. Alidokht, Alejandra Islas Encalada, Venkata N. V. Mungala, Richard R. Chromik, Christian Moreau, Navid Sharifi, Pantcho Stoyanov, Mary E. Makowiec

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Abstract

The cohesion bond strength of two different families of HVOF coatings was evaluated by cross-sectional scratch testing at multiple loads, according to the ISO working draft (ISO/WD 27307). Diamalloy 3001 coatings with and without regions of enhanced oxidation were investigated. Stellite 6 coatings with and without Cr₃C₂ carbide phases were also observed. The effects of oxidation and composition on the cohesion bond strength of these metallic and composite HVOF coatings were analyzed. Cross-sectional scratch testing revealed to be a useful qualitative tool for comparing the cohesion strength of different thick HVOF coatings, as well as identifying their failure mechanisms and observing their relationship to the coating microstructure and composition. Indeed, in both coating families tested here, the presence of ceramic compounds was linked to a decrease in the overall cohesion strength of the coating. Cracking and/or microcracking in these brittle ceramic phases was observed and is the likely mechanism behind the lower overall cohesion strength in the coatings. Splat boundary failure occurred preferentially at heavily oxidized splat boundaries in the Diamalloy 3001 coatings. Cracking within the Cr₃C₂ phase of the Stellite 6 composite coating significantly decreased the cohesive bond strength at high scratch loads.

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厚 HVOF 热喷涂涂层的划痕附着力测试

根据国际标准化组织的工作草案（ISO/WD 27307），在多种载荷下通过横截面划痕测试评估了两种不同系列 HVOF 涂层的内聚结合强度。对有和没有强化氧化区域的 Diamalloy 3001 涂层进行了研究。还观察了含有和不含有 Cr3C2 碳化物相的 Stellite 6 涂层。分析了氧化和成分对这些金属和复合 HVOF 涂层内聚结合强度的影响。横截面划痕测试是一种有用的定性工具，可用于比较不同厚 HVOF 涂层的内聚强度，确定其失效机理，并观察其与涂层微观结构和成分的关系。事实上，在这里测试的两个涂层系列中，陶瓷化合物的存在都与涂层整体内聚强度的降低有关。在这些脆性陶瓷相中观察到了裂纹和/或微裂纹，这可能是涂层整体内聚强度降低背后的机理。在 Diamalloy 3001 涂层中，溅射边界失效主要发生在严重氧化的溅射边界。在高划痕载荷下，Stellite 6 复合涂层中 Cr3C2 相的裂纹大大降低了内聚结合强度。

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来源期刊

Journal of Thermal Spray Technology 工程技术-材料科学：膜

CiteScore

5.20

自引率

25.80%

发文量

198

审稿时长

2.6 months

期刊介绍： From the scientific to the practical, stay on top of advances in this fast-growing coating technology with ASM International''s Journal of Thermal Spray Technology. Critically reviewed scientific papers and engineering articles combine the best of new research with the latest applications and problem solving. A service of the ASM Thermal Spray Society (TSS), the Journal of Thermal Spray Technology covers all fundamental and practical aspects of thermal spray science, including processes, feedstock manufacture, and testing and characterization. The journal contains worldwide coverage of the latest research, products, equipment and process developments, and includes technical note case studies from real-time applications and in-depth topical reviews.