MICROSTRUCTURE CHARACTERISTICS OF THE NICKEL MATRIX IN ELECTRODEPOSITED NI-PSZ GRADIENT COATING

The microstructure and orientation of the nickel matrix in electrodepo sited Ni-PSZ gradient coating, were investigated. With the increase in the PSZ particle content in gradient coating through thickness, the n ickel grains gradually become fine and even and the defects in the nic kel matrix gradually decrease due to increasing cathodic polarization during electrodeposition. The nickel matrix in gradient coating has in tensive preferred orientation of [200] planes which slightly weakens w ith the increase in the PSZ content. Heat-treatment eliminates the mic rostructural change of the nickel matrix, but has no influence on pref erred orientation of the nickel matrix.