论文部分内容阅读
NiCrAlY coatings were deposited on Ni-based superalloy by high-velocity oxygen-fuel spraying(HVOF).Surface modification by means of grit-blasted,shot-peened and ground methods was used in order to study the effect of surface conditions on the isothermal oxidation behavior of HVOF-sprayed NiCrAlY coatings at 1 050℃.The results showed that surface modification had an obvious effect on the isothermal oxidation behavior of the coatings.There was a large decrease in growth rate compared with the as-sprayed coating.The scale formed on the grit-blasted and shot-peened coatings was a mixture of Al_2O_3 and NiCr_2O_4,while the oxide formed on the ground coating was composed mainly of Al_2O_3.After surface modification,the content of NiCr_2O_4 spinels decreased compared with the as-sprayed coating.
NiCrAlY coatings were deposited on Ni-based superalloy by high-velocity oxygen-fuel spraying (HVOF). Surface modification by means of grit-blasted, shot-peened and ground methods was used in order to study the effect of surface conditions on the isothermal The oxidation behavior of HVOF-sprayed NiCrAlY coatings at 1 050 ℃. The results showed that surface modification had an obvious effect on the isothermal oxidation behavior of the coatings.There was a large decrease in growth rate compared with the as-sprayed coating.The scale formed on the grit-blasted and shot-peened coatings was a mixture of Al 2 O 3 and NiCr 2 O 4, while the oxide formed on the ground coating was composed mainly of Al 2 O 3. After surface modification, the content of NiCr 2 O 4 spinels decreased compared with the as-sprayed coating .