Effect of high-temperature treatment of bronze particles on the characteristics of coatings formed by the method of cold gas-dynamic spraying

Effect of preliminary heat treatment of CuAl$_{10}$Fe$_3$Mn$_2$ bronze particles in the working chamber of a furnace with varying atmosphere on the process of applying coatings by cold gas-dynamic spraying and their properties is experimentally studied. It is shown that an temperature rise in the working chamber of the furnace reduces the microhardness of the material from $\mathrm{HV}_{0.025} = 240$ to $\mathrm{HV}_{0.025} = 115$. It is noted that the spraying process is accompanied by an increase in the specific mass of the coatings from 1.62 to 3.50 kg/m$^2$. It is shown by the study of the surface structure and physical characteristics that, for the coatings obtained from the original bronze powder, porosity is 2%, the arithmetic mean of the absolute values of profile deviations within the base length $\mathrm{Ra} = 27$ m, and microhardness is $\mathrm{HV}_1 = 250$. For the coatings obtained from heat-treated bronze powder, porosity is 5%, $\mathrm{Ra} = 21$ m, and microhardness is $\mathrm{HV}_{0.1} = 300$.