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首页> 外文期刊>Journal of Materials Engineering and Performance >Characterization and High-Temperature Erosion Behaviour of HVOF Thermal Spray Cermet Coatings
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Characterization and High-Temperature Erosion Behaviour of HVOF Thermal Spray Cermet Coatings

机译：HVOF热喷涂金属陶瓷涂层的表征和高温冲蚀性能

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摘要

High-velocity oxygen fuel (HVOF) thermal spray, carbide-cermet-based coatings are usually employed in high-temperature erosive and erosive-corrosive environments. Extensive literature is available on high-temperature erosion performance of HVOF coatings under moderate to low particle flux and velocities for application in boiler tubes. This research work presents the characterization and high-temperature erosion behaviour of Cr3C2-25NiCr and WC-10Co-4Cr HVOF-sprayed coatings. Coatings were formulated on the substrate steel of type AISI 304, commonly used for the fabrication of pulverized coal burner nozzles (PCBN). Erosion testing was carried out in high-temperature air-jet erosion tester after simulating the conditions akin to that prevailing in PCBN in the boiler furnace. The coatings were tested for erosion behaviour at different angles and temperatures by freezing other test parameters. Brittle erosion behaviour was depicted in erosion testing, and the coatings couldn't restrain the erodent attacks to protect the substrate. High particle velocity and high particle flux were attributed to be the reasons of extensive erosive weight loss of the coatings. The surface morphology of the eroded specimens was analysed from back-scattered electron images to depict the probable mechanism of material removal. The coatings were characterized with optical microscopy, SEM-EDS analysis, XRD analysis, micro-hardness testing, porosity measurements, surface roughness testing and bond strength testing. The work was undertaken to investigate the performance of the selected coatings in highly erosive environment, so as to envisage their application in PCBNs for protection against material degradation. The coatings could only sustain in oblique impact erosion at room temperature and depleted fully under all other conditions.
机译：高速氧燃料（HVOF）热喷涂，碳化物-金属陶瓷基涂料通常用于高温腐蚀和腐蚀腐蚀环境。在中低粒子通量和速度下，HVOF涂层在锅炉管中的高温腐蚀性能已有大量文献报道。这项研究工作提出了Cr3C2-25NiCr和WC-10Co-4Cr HVOF喷涂涂层的表征和高温腐蚀行为。在通常用于制造煤粉燃烧器喷嘴（PCBN）的AISI 304型基底钢上配制了涂层。在模拟了类似于锅炉炉中PCBN普遍存在的条件之后，在高温喷气侵蚀测试仪中进行了侵蚀测试。通过冻结其他测试参数来测试涂层在不同角度和温度下的腐蚀行为。在腐蚀测试中描述了脆性腐蚀行为，并且涂层不能抑制腐蚀侵蚀来保护基材。高颗粒速度和高颗粒通量归因于涂层大量侵蚀性失重的原因。从反向散射的电子图像分析了腐蚀样品的表面形态，以描述材料去除的可能机理。通过光学显微镜，SEM-EDS分析，XRD分析，显微硬度测试，孔隙率测量，表面粗糙度测试和粘结强度测试对涂层进行表征。进行了工作以研究所选涂层在高侵蚀性环境中的性能，从而设想它们在PCBN中的应用以防止材料降解。涂层只能在室温下承受倾斜冲击侵蚀，而在所有其他条件下则完全耗尽。

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