Determination of internal stresses in pyrolytic coatings produced from metallic-organic compounds

A method was developed for measuring the internal stresses in metallic coatings directly during the formation of these coatings in thermal dissociation of the metallic-organic compounds from the gas phase. The internal stresses in the coatings were evaluated using a glass zero pressure gauge with a flat membrane 20-25 mm in diameter and no more than 25-35 μm thick. The internal stresses formed in growing chrome coatings produced by thermal dissociation of bisethylbenzolchrome at a temperature of 450-470°C were measured. The internal stresses calculated for the chrome coatings in relation to their thickness are presented. The graph shows that high stresses form mainly in the glass-chrome boundary layer and are then gradually distributed in the entire growing coating.