Analysis of the effect of thermal deformation and friction wear of reinforced DLC film on the end face of high-speed mechanical seals
Under dry friction conditions,the mechanical seals of kettle equipment experience poor heat dissipation and lubrication,leading to significant thermal deformation and wear problems on their seal faces.Strengthening the seal end face by deposition of diamond-like carbon,DLC coating can effectively decrease the coefficient of friction and prevent thermal deformation,thereby extending the seal's lifespan.Based on the seal structure of the reactor and considering the basic material of the seal ring and the characteristics of DLC,friction coefficients and wear rates of the frictional pairs formed by different thicknesses of DLC coatings and resin-impregnated graphite were tested by using a friction and wear testing machine under various working conditions.The friction coefficients obtained from the experiments were utilized to establish a thermal-structural integrated model of mechanical seals using finite element software.The temperature field and deformation field of the end face with typical DLC coating thicknesses were analyzed in conjunction with the experimental results.The wear reduction effect of DLC coating was also analyzed based on the experimental results.The analysis results indicated that the DLC coating had a significant wear reduction effect compared with the friction pair without DLC coating.At different pcv values,the DLC coating could decrease the friction coefficient by 43.9％,the wear rate by 67.53％,and the steady-state temperature and deformation by approximately 18％and 25％on average,respectively.The frictional pair formed by the 6μm DLC coating had a better performance than that formed by the 2µm coating,with the peak temperature and deformation were further reduced by 2.23％and 2.52％at the maximum.The DLC coating could reduce the wear rate of the end face,steady-state temperature and deformation,offering reference for prolonging the life of reactor mechanical seals under dry friction conditions and enhancing seal stability.
reactorsmechanical sealsattritionnumerical simulationheat transferend face deformationend face strengthening
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