Microstructure Analysis And Characterization Of Sintered Metal Random Fibrous Felt And Its Parametric-based Modelling

As a new type of porous metal functional materials, sintered metal random fibrous felt(SMRFF), which are equipped with the inherent physical and chemical properties of metalmaterials and structure and functional properties of the porous materials, have attracted largeattention of academic interests,in addition to the very broad application prospects and space inthe field of engineering. In this dissertation, several sintered copper random fibrous felt (SCRFF)samples have been produced under different controllable process parameters to be used asresearch objects. The coupling mechanism between their preparation process andmicrostructure and the effect laws of microstructure on macro-performance have been studiedon with experimental research and analysis. Moreover, a kind of new method for effectivedigital description of the microstructure is proposed. The main research contents of thisdissertation are as follows:1. Study on the controllable process parameters set of SMRFF and its preparationThe conception of controllable process parameter set is proposed through the analysis ofthe preparation process of SMRFF. Preparation process experiments are designed to maketargeted study on variable elements of the set, based on principle of control variable method.Five groups of SCRFF samples are produced for subsequent study on their microstructurecharacteristics and the coupling mechanism between the preparation process and microstructure.2. Analysis of microstructure characteristics of SMRFFThe skeleton structure of SMRFF samples are extracted using Micro-CT andskeletonization algorithm. The conception of microstructure characterization parameter set isproposed through analysis of the skeletal structure samples. The microstructure characteristicsof those samples and the mapping mechanism between controllable process parameter set andmicrostructure characterization parameter set are studied via experimental research andquantitative analysis. The results show that the mapping mechanism between these two sets isable to provide some effective data support to the research of coupling mechanism betweenSMRFF’s preparation process and their microstructure.3. Experimental investigation on the effect laws of SMRFF’s microstructure characteristics ontheir macro-performanceTwo experiments are designed to study the uniaxial tensile properties and catalyst loadingefficiency of SMRFF samples under different microstructure characteristics, based on principleof control variable method. The experimental results show that the maximal withstanding loadand catalyst loading efficiency increase and decrease respectively with the number of B-B path and sintering point increasing. These two properties are enhanced when the orientationdistribution of fiber segments in through-thickness direction is more concentrated.4. Interactive design of parametric-based model of SMRFF and its transport propertiessimulationBased on quantitative analysis of SMRFF samples’ microstructure characteristics,parametric-based models are used to make effective digital description of the microstructure ofSMRFF. Models’ transport properties are investigated using numerical simulation. The resultsreveals that parametric-based models has made positive progress in geometric authenticity andparameter controllability. The transport properties of SMRFF have been significantly enhanceddue to its all connected microcosmic pore structure and microchannel characteristics.