Silicon-boronising of Nimonic 90 superalloy

Microstructure of direct current and pulse magnetron sputtered Cr–B coatings

“…Secondly, the microstructure of PMS deposited (near-stoichiometric) CrB coatings, possessing a Cr : B ratio of ∼1 : 0.9, is studied. Such coatings were found to be much less crystalline -again, as determined by XRD -having a hardness of ∼20 GPa (in agreement with other recent studies [14,15]). In the present work, PVD coating structures are investigated and compared; the effect of oxygen contamination from the powder target material on the structural evolution of the films is also discussed.…”

Influence of laser alloying with boron and niobium on microstructure and properties of Nimonic 80A-alloy

“…However, some processes, widely used for steels such as case-hardening or diffusion carburizing [5,6], were not appropriate for Ni-based alloys because of the very low solubility of carbon in nickel [7]. While such a surface treatment as boriding [8][9][10][11][12][13][14][15][16][17][18][19], nitriding [20][21][22][23][24][25][26][27][28][29][30] as well as physical and chemical vapor deposition [31][32][33] increased the hardness and wear resistance of the considered superalloys.…”

“…Nickel could be easily boronized, and the produced boride layer was thick and resistant to wear. However, in case of the pack-boriding, the use of the commercial Ekabor powder [8][9][10][11] was not advisable. The presence of SiC in such a powder mixture resulted in the formation of porous nickel silicides, which diminished the hardness of borided layers.…”

XPS calibration study of thin‐film nickel silicides

“…[4] The next lowest are those of Ni 2 Si (24-30µ cm) and NiSi 2 (34-50µ cm). Nickel silicides are also viable candidates as coating materials for protecting Ni-base superalloys and stainless steels [5,6] because of their excellent combination of wear, corrosion and oxidation resistance. For these applications, it is clear that the surface and interface behaviour of the silicides is of prime importance.…”