900℃下爆轰枪喷涂Al2O3-40TiO2涂层对镍基高温合金的热腐蚀行为

N. Mishra, Naveen Kumar, Srishti Mishra
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引用次数: 10

摘要

热腐蚀是锅炉和燃气轮机部件失效的主要退化机制。这些故障的发生是由于在高温下使用广泛的燃料,如煤和石油。镍基高温合金具有优良的机械强度和高温抗蠕变性能,但在高温下耐热腐蚀性能较差。为了克服这些问题,在这些材料上沉积了热耐腐蚀涂层。本研究采用爆轰枪法在Superni 718和AE 435高温合金表面沉积了Al2O3-40%TiO2粉末。在腐蚀环境Na2SO4-82%Fe2(SO4)3中,在900℃高温循环条件下,研究了涂覆Al2O3-40%TiO2和未涂覆Al2O3-40%TiO2的Superni 718和AE 435合金的热腐蚀性能。腐蚀的动力学是通过每次循环后的重量变化测量来估计的,总共持续50个循环。采用扫描电镜对热腐蚀产物进行了表征。涂层样品比未涂层样品具有更好的耐热腐蚀性能。AE 435高温合金在特定环境下的热腐蚀性能优于Superni 718。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hot Corrosion Behaviour of Detonation Gun Sprayed Al2O3-40TiO2 Coating on Nickel Based Superalloys at 900°C
Hot corrosion is the major degradation mechanism of failure of boiler and gas turbine components. These failures occur because of the usage of wide range of fuels such as, coal and oil at the elevated temperatures. Nickel based superalloys having excellent mechanical strength and creep resistance at elevated temperature are used under such environment but they lack resistance to hot corrosion at high temperature. To overcome these problems hot corrosion resistant coatings are deposited on these materials. In the current investigation Al2O3-40%TiO2 powder has been deposited on Superni 718 and AE 435 superalloys by Detonation Gun method. The hot corrosion performance of Al2O3-40%TiO2 coated as well as uncoated Superni 718 and AE 435 alloys has been evaluated in aggressive environment Na2SO4-82%Fe2(SO4)3 under cyclic conditions at an elevated temperature of 900°C. The kinetics of the corrosion is approximated by weight change measurements made after each cycle for total duration of 50 cycles. Scanning electron microscopy was used to characterize the hot corrosion products. The coated samples imparted better hot corrosion resistance than the uncoated ones. The AE 435 superalloy performed better than Superni 718 for hot corrosion in a given environment.
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