Yttria-stablized zirconia(YSZ)/(Ni,Al)coatings were deposited on Inconel600alloy substrate by the electrophoreticdeposition combined with vacuum sintering technique.The effects of isothermal oxidation at1100°C on...Yttria-stablized zirconia(YSZ)/(Ni,Al)coatings were deposited on Inconel600alloy substrate by the electrophoreticdeposition combined with vacuum sintering technique.The effects of isothermal oxidation at1100°C on the composition of thecoatings and the crack healing were investigated,and the corrosion resistance of the coatings in3.5%NaCl(mass fraction)solutionwas also studied.The results showed that the cracks on the coating gradually healed up with the increase of the isothermal oxidationtime.During isothermal oxidation process,the coating composed of Ni3Al was transformed toα-Al2O3particulates.Theα-Al2O3particulates can seal the defects such as pores and cracks,and meanwhile prevent the oxygen diffusion into the coatings.Thepolarization curves and EIS results indicated that the coatings oxidized for40h had a more positive corrosion potential,higherbreakdown potential,higher impedance module at low frequency and much lower corrosion current density compared with YSZcoated and uncoated Inconel600alloys.展开更多
Mar-M247 is a nickel-based alloy which is well known as difficult-to-machine material due to its characteristics of high strength, poor thermal diffusion and work hardening. Calculation of shear stress by an analytica...Mar-M247 is a nickel-based alloy which is well known as difficult-to-machine material due to its characteristics of high strength, poor thermal diffusion and work hardening. Calculation of shear stress by an analytical force model to indicate the effect of coating material, cutting speed, feed rate on tool life and surface roughness was conducted experimentally. Cutting tests were performed using round inserts, with cutting speeds ranging from 50 to 300 rn/min, and feed rates from 0.1 to 0.4 mm/tooth, without using cooling liquids. The behavior of the TiN and TiCN layers using various cutting conditions was analyzed with orthogonal machining force model. Cutting results indicate that different coated tools, together with cutting variables, play a significant role in determining the machinability when milling Mar-M247.展开更多
基金Project(51271111)supported by the National Natural Science Foundation of ChinaProject(15KY0501)supported by the Graduate Research and Innovation Special Project of Shanghai University of Engineering Science,China
文摘Yttria-stablized zirconia(YSZ)/(Ni,Al)coatings were deposited on Inconel600alloy substrate by the electrophoreticdeposition combined with vacuum sintering technique.The effects of isothermal oxidation at1100°C on the composition of thecoatings and the crack healing were investigated,and the corrosion resistance of the coatings in3.5%NaCl(mass fraction)solutionwas also studied.The results showed that the cracks on the coating gradually healed up with the increase of the isothermal oxidationtime.During isothermal oxidation process,the coating composed of Ni3Al was transformed toα-Al2O3particulates.Theα-Al2O3particulates can seal the defects such as pores and cracks,and meanwhile prevent the oxygen diffusion into the coatings.Thepolarization curves and EIS results indicated that the coatings oxidized for40h had a more positive corrosion potential,higherbreakdown potential,higher impedance module at low frequency and much lower corrosion current density compared with YSZcoated and uncoated Inconel600alloys.
文摘Mar-M247 is a nickel-based alloy which is well known as difficult-to-machine material due to its characteristics of high strength, poor thermal diffusion and work hardening. Calculation of shear stress by an analytical force model to indicate the effect of coating material, cutting speed, feed rate on tool life and surface roughness was conducted experimentally. Cutting tests were performed using round inserts, with cutting speeds ranging from 50 to 300 rn/min, and feed rates from 0.1 to 0.4 mm/tooth, without using cooling liquids. The behavior of the TiN and TiCN layers using various cutting conditions was analyzed with orthogonal machining force model. Cutting results indicate that different coated tools, together with cutting variables, play a significant role in determining the machinability when milling Mar-M247.
