The Material Design And Property Research Of The Novel PTFE-based Composite

Nowadays,in a sense,the processing level and quality of precision and ultra-precision machining embody a top-level of national machinery manufacturing.Therefore,it proposes a higher demand for stiffness and vibration and noise reduction of basic components of machine tool.However,cast iron as traditional material is difficult to meet the requirement of precision and ultra-precision machining.The research and development of advanced composite material that has good stiffness and vibration and noise reduction has been a general trend.PTFE as a resin material that possesses excellent properties has good acid and alkali corrosion resistance.PTFE resin is tried to use as the matrix material of composite to replace epoxy resin which is widely used.The selections of aggregate type are high purity quartz and alumina ceramic microsphere.The selections of filler type are nano-alumina and hollow glass microsphere.Though composition,aggregate gradation,prediction of Young's modulus and acoustic attenuation coefficient,regression fitting of prediction results and damping performance test of PTFE–based composites,the influence of different ratio and type of aggregate on stiffness and vibration and noise reduction is analyzed and contrastedFirstly,preparation technology and the type of polymer matrix,aggregate and filler of PTFE-based composites were analyzed and determined.Then,based on the theory of discontinuous particle size packing,the grading scheme that was suitable to PTFE-based composite was put forward.Secondly,based on the three-phase composite sphere model,Young's modulus of PTFE-based composites was predicted.Moreover,based on dynamic generalized self-consistent multiple scattering model that be applicable to a variety of aggregate types,acoustic attenuation coefficient of PTFE-based composites was predicted.In addition,by using grid search algorithm,genetic algorithm and particle swarm optimization algorithm to optimization key parameters c and g to optimize the support vector machine,the Young's modulus and acoustic attenuation coefficient of prediction results were adopted for regression fitting respectively.Then,the 3D irregular polyhedron aggregate packing model was established.The 2D model of irregular polygons was obtained by capturing a cross section.The finite element modal analysis of PTFE-based composites was carried out by using the 2D model.Finally,the samples of PTFE-based composites were made.By setting different types of packing and aggregate as the influence factors,the damping performance test was carried out.The composition and proportion scheme of PTFE-based composites provides some reference for future related research work in this paper.Young's modulus and acoustic attenuation coefficient of prediction results,the modal analysis results and the damping performance testing result have a certain guiding significance.