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Development of Marinized Pt-Modified MCrAlX Coatings with Improved Hot Corrosion and Oxidation Resistance Synthesized via a Low-Cost Electrodeposition Process

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Technical Report,14 Mar 2014,31 Dec 2018

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Tennessee Technological University Cookeville United States

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This project aimed to develop Pt-modified MCrAlX coatings where X SiYHf, etc. for the hot-section components in Navy gas turbine engines utilizing a low-cost electrodeposition process. A rotating barrel system was established to deposit NiCo-CrAlX coatings with uniform particle incorporation on various specimen geometries. Post-deposition heat treatment promoted interdiffusion between the CrAlX particles and NiCo matrix, leading to the formation of beta, gamma and gamma phases. The effects of heat treatment parameters were investigated. A Dean rig was built for hot corrosion screening tests. The cyclic oxidation behavior of electro-codeposited NiCoCrAlY coatings on Ni-based superalloys was evaluated at 1000 and 1100 deg C. Preliminary Type I hot corrosion testing was conducted in the Dean rig with flowing O2 0.1SO2 gas. Compared to the NiAl coatings made by non-contact pack cementation, the NiCoCrAlY coatings had better overall resistance to both cyclic oxidation and hot corrosion and also exhibited superior compatibility with the superalloy substrates. The mechanical properties of model NiCoCrAlY alloys were also evaluated. Furthermore, selected NiCoCrAlY coatings were successfully applied to the burner rig pins for further evaluation.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Properties of Metals and Alloys
  • Fabrication Metallurgy

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