Abstract
Composite alloys of nickel aluminides doped with zirconium were obtained from nickel oxide NiO and baddeleyite concentrate containing zirconium by the method of out-of-furnace alumothermal reduction. The multiphase structure of the ingot obtained by SHS metallurgy has been established by scanning electron microscopy and micro X-ray spectral analysis. With an increase of zirconium content in the alloy up to 3.52 wt.% the amount and variety of nickel aluminide phases doped with zirconium linearly increase. The influence of aluminum-matrix electrode alloys from Al-Ni-Zr on the ESA process and wear resistance of the coatings on steel 45 under various processing modes tsk/tp= 40/50 and 25/80 in the argon atmosphere and in air has been established and scientifically substantiated: The erosion resistance of the anode materials made of Al-Ni-Zr alloys does not change monotonously while changing the zirconium content in the argon atmosphere. The minimum erosion resistance of the anode alloy is observed at 1.05 wt.% Zr, and the maximum - at 3.52 wt.% Zr. The fact that erosion resistance of the anode materials in argon is lower than in air concerns all the Al-Ni-Zr alloys investigated and in all ESA treatment modes, except the anode material with 3.52 wt.% Zr; In all the cases, the greatest weight gain value at the formation of an alloyed coating during ESA (t = 10 μs) is observed when using the anode material with 1.05 wt.% Zr, which is characterized by low erosion resistance, and the smallest weight gain value - with 0.47 wt.% Zr with higher erosion resistance; the highest wear resistance is observed when the anode material contains 1.52 wt.% Zr at ESA in argon (it increases 2.8 times when compared to steel 45).
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call