The Influence Of Porosity On Deformation And Heat Transfer Of Porous Ceramic

New types of porous ceramic materials are widely used in many fields, to engage in materials science more and more researchers turned to the new field. At present, the preparation technology of porous ceramics research has gradually maturing, the new preparation methods are available. The performances of the porous ceramics research are also popular, new research appear constantly.Basis of the theory of porous materials research, porosity of porous ceramics for suppression effects of deformation, the heat transfer performance of the porosity of porous ceramics are studied as the main line, to predict the premise, the theoretical analysis results with ANSYS as the main research tool, to Al2O3 materials of porous ceramic materials on the basis of mechanics and heat transfer performance analysis of the simulation experiment. The results of simulation were compared with the theoretical prediction and other scholar.Through some researches on the deformation of suppress of porous ceramics, here the author assumes that: porosity affects the degree of deformation; they have correlations; however, geometric models do a little to the results of deformation. The author also builds a obturator spherical model and perforated cube model that represents porous material, and do a mock deformation on A1203 porous ceramics through finite element software, which the deformation is 30%. Results show that porosity and lateral deformation have a non-linear relationship, which means that when porosity increases, deformation decreases. When the porosity reaches 6.94% or 53.9%, the deformation appears unobvious. The mock analysis and theoretical prediction has a similar result.The author predicts and deduces the effects that porosity brings to heat transfer performance, then simulates how the porosity transfers heat of porous ceramics, which only considers the effect of the heat conduction have on. During the procedure, the author deduces the effective thermal conductivity using obturator cube model, and analyses the heat-conducting property with a spherical model, through finite element software. Results show that, effective thermal conductivity is non-linear, meaning when porosity rises, thermal conductivity decreases, and the rate of change is low, though it gets faster. The results is almost the same as what the author predicts.