The dynamic compressive properties of B4C ceramic by plasma spraying multilayer Co/Ni–TiCN coatings

Abstract

The Co/Ni–TiCN multilayer coatings with two layer, four layer and gradient structure were plasma sprayed on B4C ceramic matrix. The effect of the multilayer structure on the dynamic compressive properties of B4C matrix was investigated. The Co/Ni–TiCN coatings consisted of Co–Ni–Cr–Mo and TiC1-XNX (0 ≤ x ≤ 1) phases. At the strain rate of 700 s−1, the peak stress increased by ∼200% after B4C surface coated with multilayer Co/Ni–TiCN coatings, the energy reflectivity increased by 412% (2 layer), 850% (4 layer) and 847% (gradient), and the energy transmittance decreased by 55% (2 layer), 80% (4 layer) and 83% (gradient). At 1500 s−1, the energy reflectivity increased by 490% (2 layer), 705% (4 layer) and 750% (gradient), and the energy transmittance decreased by 57% (2 layer), 83% (4 layer) and 89% (gradient). Compared with 2 layer structure, the 4 layer and gradient structure exhibited enhanced compressive properties because of the more layer interfaces for the reflection and transmission of the stress waves.