Technological parameters of gas-dynamic spraying affecting the formation coating based on mixture of particles copper, zinc and corundum

Abstract

The results of a study of the effect of the spraying temperature and the overlap coefficient on the formation of the coating structure based on a mixture of Cu, Zn and Al2O3 particles applied by cold gas-dynamic spraying are presented. X-ray diffraction analysis has shown a decrease in the size of coherent scattering regions (CSR) from 200 nm to 90 nm for copper and to 64 nm for zinc when using an overlap coefficient of 55 % and more significant (up to 22 nm) with an overlap of 64 %. The CSR sizes of electronic type compounds CuZn3 (ε-phase) and Cu5 Zn8 (γ-phase) are quite close to the CSR size of zinc. The microdeformation of copper decreases from 187 to 119 % with an increase in the deposition temperature and does not depend on the overlap coefficient. For the electronic compound of the ε-phase, the microstrain value increases, and the γ-phase decreases by 2 times (from 0.31 to 0.17 %). The mass fraction of aluminum oxide (corundum) decreases from 5.4 to 2.2 % with an increase in the spraying temperature. The use of the maximum spraying temperature of 450 °C is accompanied by the formation of zinc oxide, the mass fraction of which is 4.3 % with 64 % overlap.