New high temperature-resistant NiCrAl and NiCrAl + Hf felt materials

Leprince, G.; Alpérine, S.; Vandenbulcke, L.; Walder, A.

doi:10.1016/0921-5093(89)90796-x

Cited by 8 publications

(2 citation statements)

References 2 publications

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“…Diffusion aluminide coatings have been applied to both Ni‐based superalloys and Fe‐based alloys to improve their oxidation resistance . Efforts have also been made in incorporating low levels (<1 wt.%) of reactive elements (REs) into the aluminide coatings to further enhance coating oxidation performance . Although the beneficial RE effects have been well demonstrated in bulk alloys , their effects have not been realized to the same degree in aluminide coatings.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of clean aluminide coatings on Ni‐based superalloys via a modified pack cementation process

Priest

Zhang

2015

Materials & Corrosion

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With the aim of seeking a modified pack cementation process as a potential low‐cost alternative to form clean and reproducible aluminide coatings for laboratory diffusion coating research, four non‐contact arrangements were employed to coat Ni‐based superalloy specimens. The advantages and disadvantages of each arrangement were discussed by comparing the cleanliness of coating surface, the homogeneity of surface Al content and coating thickness, as well as the easiness of preparation. By utilizing the arrangement with the best overall quality, an Ni‐rich β‐NiAl coating with a clean surface and a low S level (0.3 ppmw) was achieved, which was comparable to the coatings previously made by an ultra‐clean laboratory chemical vapor deposition (CVD) process. Reactive element (RE) additions such as Hf, Zr, or Y were codeposited by including a small amount of the respective RE oxide in the pack mixture, and approximately 500 ppmw Hf was detected in the Hf‐modified NiAl coating.

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Section: Introductionmentioning

confidence: 99%

Synthesis of clean aluminide coatings on Ni‐based superalloys via a modified pack cementation process

Priest

Zhang

2015

Materials & Corrosion

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“…3. LePrince et al 39 used a high activity process with a powder mixture of pure source elements to codeposit A1 and Hf onto Ni-base fibers. The resulting coating consisted of a NiA1 matrix with NisHf precipitates.…”

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confidence: 99%

Pack Cementation Aluminide Coatings on Superalloys: Codeposition of Cr and Reactive Elements

Bianco

Rapp

1993

J. Electrochem. Soc.

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A single-step chloride-activated pack cementation process has been developed for growing a Cr/RE(Y, Zr) -modified or a RE(Y, Zr, Hf)-deped aluminide diffusion coating on commercial Ni-base superalloys. The coatings consisted of an outward-grown hypostoichiometric ~-NiA1 layer with a substantial enrichment in Cr and a low reactive element content, The Cr was both dissolved in the ~-NiA1 matrix and precipitated as ~-Cr second-phase particles. Aluminide coatings grown outwards in a pack permitting powder contact with the substrate were embedded with A1203 and reactive element (RE) oxide pack particles. Physical separation of the substrates from the powder mixture eliminated powder entrapment but reduced the growth rate and the amount of Cr enrichment in the coating. Isolation of the substrate from the pack introduced partial rate control by gaseous diffusion.

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Pack cementation diffusion coatings

Bianco¹,

Rapp²

1996

Metallurgical and Ceramic Protective Coatings

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New high temperature-resistant NiCrAl and NiCrAl + Hf felt materials

Cited by 8 publications

References 2 publications

Synthesis of clean aluminide coatings on Ni‐based superalloys via a modified pack cementation process

Synthesis of clean aluminide coatings on Ni‐based superalloys via a modified pack cementation process

Pack Cementation Aluminide Coatings on Superalloys: Codeposition of Cr and Reactive Elements

Pack cementation diffusion coatings

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