Thermomechanical Contact Phenomena and Wear of Sliding Components

摘要

The objectives of this investigation were to better understand the tribological behavior of ceramic-coated rings sliding against carbon graphite and thermocracking that occurs with some of the ceramic coatings. Sliding wear tests were conducted on Inconel 625 substrates coated with four different materials: chromium oxide, chromium carbide, titanium nitride, and tungsten carbide. Tests were also run to determine the corrosion behavior of the ceramic-coated rings in seawater. Surface profilometry, mass loss measurements, and microscopy were used to characterize wear, cracking and corrosion phenomena. Residual stresses and preferred orientations of one of the coatings (TiN) were determined by X-ray diffractometry methods and hardness and modulus of elasticity of the TiN coatings were measured by nanoindentation hardness testing. Coupled with the experimental work was a theoretical analysis of temperatures and stresses in the contact region of the ceramic coating during sliding. The influence of various material and geometric parameters on coating cracking or spalling was studied in the analytical work. Keywords: Mechanical face seals; Wear; Friction; Ceramic coatings. (JHD)