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Chromium-titanium carbide cermet coating for elevated temperature erosion protection in fluidized bed combustion boilers

机译:用于流化床燃烧锅炉的高温腐蚀防护的铬钛碳化物金属陶瓷涂层

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The elevated temperature erosion resistance of one high-velocity oxygenfuel (HVOF) chromium-titanium carbide cermet coating on mild steel was investigated in a laboratory blast nozzle-type erosion tester. Erosion tests were carried out at 300 and 450 deg C, at particle velocities of 30 and 60 m/s and at impact angles of 30 deg and 90 deg, using bed ashes and fly ashes retrieved from operating fluidized bed combusion (FBC) boilers. The elevated temperature erosion behavior of HVOF chromium-titanium carbide cermet coating was compared with that of two reference materials, mild steels (AISI 1018, ASTM SA213 T22) and other thermal sprayed coatings, including an HVOF chromium carbide cermet coating, an HVOF tungsten carbide cermet coating, and an arc-sprayed FeCrSiB metallic coating. The morphology of specimens was examined by light microscopy and scanning electron microscopy. The thermal shock resistance of the coatings specimens was measured. It was found that the HVOF chromium-titanium carbide cermet coating exhibited high erosion resistance, with similar level to that of the HVOF tungsten carbide cermet coating, but with a much higher thermal shock resistance. The erosion behavior of the coatings is closely related to their microstructure, composition and the properties of erodent particles. However, the effect of these factors on the erosion behavior varied with erosion test conditions.
机译:在实验室高炉喷嘴式腐蚀试验机中研究了一种在高碳钢上的高速氧燃料(HVOF)铬-碳化钛金属陶瓷涂层的耐高温腐蚀性能。使用从运行的流化床燃烧(FBC)锅炉中回收的粉煤灰和粉煤灰,在300和450℃,颗粒速度为30和60 m / s以及冲击角为30度和90度的条件下进行了侵蚀试验。将HVOF铬钛碳化物金属陶瓷涂层的高温腐蚀行为与两种参考材料,低碳钢(AISI 1018,ASTM SA213 T22)和其他热喷涂涂层(包括HVOF碳化铬金属陶瓷涂层,HVOF碳化钨)的高温腐蚀行为进行了比较金属陶瓷涂层和电弧喷涂的FeCrSiB金属涂层。通过光学显微镜和扫描电子显微镜检查样品的形态。测量了涂层样品的抗热震性。已经发现,HVOF铬-碳化钛金属陶瓷涂层表现出高耐蚀性,与HVOF碳化钨金属陶瓷涂层相似,但是具有更高的耐热冲击性。涂层的腐蚀行为与其微观结构,组成和侵蚀性颗粒的特性密切相关。但是,这些因素对腐蚀行为的影响随腐蚀测试条件的不同而不同。

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