The isothermal and cyclic oxidation behaviors of bulk pure nickel and its Ni-0.5Ymicrocrystal coating sputtered by magnetron at 1 000 ℃in air were studied.The scanning electronic microscopy(SEM)and transmission elect...The isothermal and cyclic oxidation behaviors of bulk pure nickel and its Ni-0.5Ymicrocrystal coating sputtered by magnetron at 1 000 ℃in air were studied.The scanning electronic microscopy(SEM)and transmission electronic microscopy(TEM)were used to examine the structures of the coating and the NiO oxide films.The laser Raman spectrum was also used to measure the stress level in NiO films formed on bulk nickel and the coating.It is found that the Ni-0.5Y microcrystal coating has lower oxidation rate,and the grain size of NiO formed on Ni-0.5Ycoating is also relatively smaller than that formed on bulk nickel.Meanwhile,the compressive stress level of oxide film formed on Ni-0.5Ycoating was lower than that formed on bulk nickel,and the high temperature plasticity of oxide film was much improved in coating case.The improvements of anti-oxidation properties of the sputtered Ni-0.5Ycoating are due to the microcrystal structure and yttrium.展开更多
文摘The isothermal and cyclic oxidation behaviors of bulk pure nickel and its Ni-0.5Ymicrocrystal coating sputtered by magnetron at 1 000 ℃in air were studied.The scanning electronic microscopy(SEM)and transmission electronic microscopy(TEM)were used to examine the structures of the coating and the NiO oxide films.The laser Raman spectrum was also used to measure the stress level in NiO films formed on bulk nickel and the coating.It is found that the Ni-0.5Y microcrystal coating has lower oxidation rate,and the grain size of NiO formed on Ni-0.5Ycoating is also relatively smaller than that formed on bulk nickel.Meanwhile,the compressive stress level of oxide film formed on Ni-0.5Ycoating was lower than that formed on bulk nickel,and the high temperature plasticity of oxide film was much improved in coating case.The improvements of anti-oxidation properties of the sputtered Ni-0.5Ycoating are due to the microcrystal structure and yttrium.
