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Aluminium depletion in NiCrAlY bond coatings by hot corrosion as a function of projection system

机译:NiCrAlY粘结涂层中铝的热腐蚀损耗与投射系统的关系

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摘要

Three different projection system are used to prepare NiCrAlY bond coats over metallic substrates: atmospheric plasma spray (APS), high velocity oxyfuel (HVOF) and high frequency pulse detonation (HFPD). These coatings were tested in hot corrosion experiments with sprayed Na2SO4 at 1000 degrees C for 20 and 100 It experiments in air. Coatings surface composition after thermal treatment was characterised by XRD and SEM. Cross section of coatings were analysed by SEM-EDX. A relationship between microstructural characteristics of initial coatings and final performance in hot corrosion was found in terms of porosity percentage: plasma sprayed coatings present higher percentage of porosity compared to HVOF and HFPD projection systems for the same composition and Al is heavily consumed in interparticle oxidation. This Al depletion in turn involves intrinsic chemical failure and surface layer is comprised by a porous spinel of mixed oxides. On the other hand, high energy projection systems produce dense coatings allowing the Al migration to external alumina layer, particularly in the case of HVOF coating. (C) 2007 Elsevier B.V. All rights reserved.
机译:三种不同的投影系统用于在金属基材上制备NiCrAlY粘结涂层:大气等离子喷涂(APS),高速含氧燃料(HVOF)和高频脉冲爆震(HFPD)。这些涂层在热腐蚀实验中进行了测试,在空气中以1000摄氏度的温度喷洒了Na2SO4进行了20和100 It实验。热处理后的涂层表面组成通过XRD和SEM表征。通过SEM-EDX分析涂层的横截面。在孔隙率方面,发现了初始涂层的微观结构特征与热腐蚀最终性能之间的关系:与HVOF和HFPD投影系统相比,等离子喷涂涂层的孔隙率百分比更高,而相同组成的HVOF和HFPD投影系统则在颗粒间氧化中大量消耗Al。铝的消耗反过来涉及固有的化学破坏,并且表面层由混合氧化物的多孔尖晶石构成。另一方面,高能投射系统产生致密的涂层,允许Al迁移到外部氧化铝层,特别是在HVOF涂层的情况下。 (C)2007 Elsevier B.V.保留所有权利。

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