Diffusion coatings

Nicholls, John H.

doi:10.1108/eb006745

Cited by 2 publications

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“…The blades of an aircraft jet engine’s rotor are provided with a thermo-resistant layer (a diffusion coating) having a high resistance to oxidation and high-temperature corrosion. Aluminum diffusion coatings can be produced using, among others, the pack cementation, the out of pack, the slurry processes, or the chemical vapor deposition methods [ 6 , 7 , 8 , 9 , 10 ]. Aluminum coating utilizing CVD (Chemical Vapour Deposition), one of the most up to date techniques, allows for the covering of complex-shaped elements, both internal and external, thanks to which it has found use in coating turbine blades with cooling channels [ 3 , 4 , 5 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Electron Microscopy Characterization of the High Temperature Degradation of the Aluminide Layer on Turbine Blades Made of a Nickel Superalloy

et al. 2020

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The effects of exposure to overheating (temperature above 1000 °C) on the degradation (modification) of layers of coatings (coatings based on aluminum) of uncooled polycrystalline rotor blades of aircraft turbine jet engines were investigated under laboratory conditions. In order to determine the nature of the changes as well as the structural changes in the various zones, a multi-factor analysis of the layers of the coating, including the observation of the surface of the blades, using, among others, electron microscopy, structural tests, surface morphology, and chemical composition testing, was carried out. As a result of the possibility of strengthening the physical foundations of the non-destructive testing of blades, the undertaken research mainly focused on the characteristics of the changes occurring in the outermost layers of the coatings. The obtained results indicate the structural degradation of the coatings, particularly the unfavorable changes, become visible after heating to 1050 °C. The main, strongly interacting, negative phenomena include pore formation, external diffusion of Fe and Cr to the surface, and the formation and subsequent thickening of Fe-Cr particles on the surface of the alumina layer.

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Section: Introductionmentioning

confidence: 99%

Electron Microscopy Characterization of the High Temperature Degradation of the Aluminide Layer on Turbine Blades Made of a Nickel Superalloy

et al. 2020

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Microstructure and Pitting Corrosion Resistance of Titanizing Coating Prepared by Pack Cementation on 316L Stainless Steel

Zeng¹

2021

International Journal of Electrochemical Science

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Titanizing coatings were prepared on 316L stainless steel by the pack cementation method at 950, 1020 and 1100 °C. The coating surface and cross-section were analyzed by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical corrosion behavior in 3.5% NaCl solution at 80 °C was measured through electrochemical techniques. The results showed that titanium coatings were continuously generated on the 316L substrate at different treatment temperatures. The coatings were composed of NiTi2, FeTi, NiTi, Ti and δ-ferrite phases through the diffusion process. The titanium coatings displayed much higher polarization resistance and pitting resistance than 316L stainless steel in the hot seawater. The pitting potential reached approximately 950 mVSCE with an increase in the titanization temperature from 950 to 1100 °C.

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Diffusion coatings

Cited by 2 publications

References 0 publications

Electron Microscopy Characterization of the High Temperature Degradation of the Aluminide Layer on Turbine Blades Made of a Nickel Superalloy

Electron Microscopy Characterization of the High Temperature Degradation of the Aluminide Layer on Turbine Blades Made of a Nickel Superalloy

Microstructure and Pitting Corrosion Resistance of Titanizing Coating Prepared by Pack Cementation on 316L Stainless Steel

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