Properties of Detonation Coatings After Thermal Annealing

摘要

the article considers the results of research $mathrm{T}mathrm{i}_{3}mathrm{S}mathrm{i}mathrm{C}_{2}$-based powder coatings obtained by detonation spraying on the surface of $mathrm{U}9/mathrm{Y}9$ (equivalent to N9) tool steel. It is determined the phase composition of coatings changes during detonation spraying as a result of the decomposition of $mathrm{T}mathrm{i}_{3}mathrm{S}mathrm{i}mathrm{C}_{2}$ powder into TiC. The influence of thermal annealing on the phase composition and corrosion resistance of $mathrm{T}mathrm{i}_{3}mathrm{S}mathrm{i}mathrm{C}_{2}/mathrm{T}mathrm{i}mathrm{C}$ multiphase coatings was studied. Vacuum thermal annealing ($10^{-2}$ Pa) was performed in the temperature interval of 700-900°C for 1 hour. The results of corrosion tests showed that the corrosion rate of the coated steel sample after annealing 800°C is 5.5 times less than by a comparison of the uncoated steel U9.