The Study Of High-temperature Self-lubricating Material Electromagnetic Induction Process Of Infiltration

This thesis was supported financially by the National Natural Science Foundation of P.R.China. The factors of electromagnetic induction infiltration in the preparation of high-temperature self-lubricating materials are investigated.Firstly, with a thermal electromagnetic coupled field analysis method, established the mathematical model and analysis method of the electromagnetic induction; simulated the electromagnetic induction heating in the matrix formed within the cross section of uniform temperature gradient, both current and power frequency can change the heating temperature. The results showed that the power frequency f= 10 x 104Hz, and the current density Js= 15 x 106A/m2, in the heating process parameters of the temperature field, which not only form the lubricant infiltration temperature, but also lubricant and the substrate material wetting angle less than 90°in this condition, low viscosity and infiltration resistance, which is favorable to infiltration of lubricant.Secondly, with a continuous medium theory, simulated the liquid lubricant fluid infiltrate the porous sintered matrix with a CFD method, studied the temperature, pressure and velocity changes through microcosmic flow. The results showed that the infiltration temperature field changed by the infiltration temperature and infiltration time from the lubricant melting to the stability infiltration, the greater external pressure and pore infiltration rate, the greater impact of the infiltration temperature field; infiltration velocity increase with pressure increasing. As the role of skin effect, the infiltration process, the substrate surface near the lubricant viscosity minimum, maximum infiltration rate.Finally, establish a two-dimensional model of micro-pore flow, with a low Reynolds number k-e double equation, analysis show that in the micro-porous flow, laminar and turbulent existence of two states, classic to the size difference between the Reynolds number laminar flow and turbulent flow of the method is no longer in the application of micro-porous; laminar flow in the low velocity state, obey Darcy's law, and in the relatively high flow state, a non linear swirl exit; as the existence of inertial resistance, generate the greater Reynolds number the larger the eddy; the smaller flow cross-section, the stronger the viscous dissipation, the greater the corresponding energy dissipation; greater porosity, smaller particle sintering neck diameter, the more favorable to lubricant infiltration.