Study On Infiltration And Synthesision Kinetics Of High Temperature Self-Lubrication Composites With An Interpenetrating Networks

The infiltration method is the important way making high performance composites,the infiltrating process is fabricated the composites through that the metal or alloy inthe melting condition infiltrates the micro-porous perform. By analysis and simulationon the infiltration process of the high temperature self-lubrication withinterpenetrating network structure making by infiltration,The paper builds theinfiltration kinetics mode and improves the infiltration theory of the perform with thelow porosity. The article established the optimization mechanism of the infiltrationparameters.This article built the infiltration kinetics in the low porosity perform, throughanalysis on the infiltration mechanism of the melting solid lubricant infiltrating theporous perform in vacuum pressure condition. The expressions of the infiltrationdepth and amount were educed, basing on the kinetics and the thermodynamic. Theeffects of the infiltration time, temperature and press on the infiltration process wasanalyzing. The results showed that the relationship between the infiltration velocityand the power of0.5infiltration press was direct ratio and the infiltration velocity wasinverse ratio to the power of the0.5infiltration time. The infiltration temperatureinfluence on the infiltration process, the main reason was that the variation of thesurface intension and the viscosity of the molten metal causing by temperature.The distribution function of the pore of the porous perform was obtained, basingon the form process of the power sintering porous material. Because themicrostructure of the porous perform was complex, it was difficult to build the modelof the actual three-dimensional.To overcome this, the actual micro structure of theporous perform was ignored and the infiltration process could simulate in statistics.The space that the substrate framework wasn’t taken into consideration. The substratewas endowed with the porosity, the effective pore diameter and the pressure losscoefficient, so the actual microstructure of the perform could have essential influenceon the fluid field. The effective simulation model was built, and verified by theexperiment which60Pb40Sn infiltrated TiC-FeCrWMoV. The infiltration process was simulated, the various curves of the infiltrationamount and velocity were obtained in the different temperature and pressure. Thesecures demonstrated that the changing trendency of the infiltration amount and velocitywere same in the different temperature and pressure. The earlier stage of theinfiltration, the increasing amount of the infiltration amount and velocity was largewith the pressure increasing. With the infiltration continuing,the increasing amount ofthe infiltration amount and velocity caused by the pressure was less. Till the laterstage,the infiltration velocity tended zero and the infiltration tended fixed value. Butthe final infiltration amount was equal, only the pressure was up the value which wasthe critical pressure. Through the simulation and the analysis on the infiltrationprocess,the critical pressures of the temperature at400℃、500℃、550℃and600℃,were7MPa、6MPa、5.5MPa、4.5MPa separately.The optimization mechanism of the infiltration parameters was built with theorthogonal experiment design. The factors combination was considered when theexperiments were designed. The orthogonal experiment table was chose. Therelationship of the infiltration process parameters influencing on the infiltration wasdiscovery by the variance analysis on the result. The optimal infiltration time pressureand temperature was determined.