孔隙率对多孔陶瓷压制变形与传热性能的影响研究
发布时间：2018-07-16 19:57
【摘要】：新型多孔陶瓷材料在诸多领域的广泛应用,让越来越多的从事材料科学的研究者将目光转向这个新领域。目前多孔陶瓷的制备技术研究已日臻成熟,新的制备方法不断问世。多孔陶瓷的性能研究也广受青睐,新的研究成果不断出现。本文以多孔材料理论研究成果为基础,以孔隙率对多孔陶瓷压制变形影响规律、孔隙率对多孔陶瓷传热性能影响规律为主线,以理论分析结果预测为前提,以ANSYS为主要研究工具,对Al2O3为基础材料的多孔陶瓷材料力学及传热性能进行了仿真实验分析。通过对多孔陶瓷的压制变形行为的系列研究,首先提出了几点假设:孔隙率不同则压制变形程度不同;孔隙率达到一定程度时,压制变形量为一定值;几何模型对压制变形规律研究结果影响不明显。构建了表述多孔材料的闭孔球面模型和开孔立方体模型,利用有限元软件对Al2O3多孔陶瓷材料进行压制过程仿真分析,压制变形量为30%。结果显示,孔隙率和多孔陶瓷的横向变形量成非线性关系,随着孔隙率上升,变形逐渐减小。当孔隙率分别达到6.94%或53.9%时,其变形量变化已经不很明显。仿真结果与理论预测结果比较,得到了基本一致的结论。对孔隙率对传热性能影响规律进行理论预测和公式推导,并对孔隙率对多孔陶瓷传热性能进行了仿真,仅考虑热传导对有效热导率的贡献,采用闭孔立方体模型对有效导热系数进行了公式推导,采用球面模型,利用有限元软件对导热性能进行分析。结果显示,有效热导率的非线性,随着孔隙率的增加,导热系数逐渐减小,变化速率较小,但呈现越来越快的下降趋势。仿真结果与理论预测基本吻合。
[Abstract]:As the new porous ceramic materials are widely used in many fields, more and more researchers engaged in material science will turn their attention to this new field. At present, the research on the preparation of porous ceramics has become more and more mature, and the new preparation methods are coming out continuously. The performance of porous ceramics is also widely accepted, and the new research results are constantly appearing. Based on the theoretical research results of porous materials, the effect of porosity on the suppression of porous ceramics and the influence of porosity on the heat transfer performance of porous ceramics is the main line. The theoretical analysis results are predicted as the premise and the ANSYS as the main research tool and the mechanical and heat transfer performance of the porous ceramic material with Al2O3 as the base material is carried out. Through a series of research on the deformation behavior of porous ceramics, we first put forward several hypotheses: the porosity is different, the deformation degree is different; when the porosity reaches a certain degree, the deformation amount is certain value; the geometric model has no obvious influence on the research results of the suppression deformation law. The closed hole spherical surface model and the open hole cube model are used to simulate the pressing process of Al2O3 porous ceramic materials using the finite element software. The compression deformation amount is 30%. results. The porosity and the transverse deformation of the porous ceramics are nonlinear. As the porosity increases, the deformation decreases gradually. When the porosity reaches 6.94% or 53.9%, the porosity is gradually reduced. The variation of the deformation amount is not very obvious. The simulation results are compared with the theoretical predictions. The theoretical prediction and formula deduction are made on the influence of porosity on the heat transfer performance, and the porosity is used to simulate the heat transfer performance of the porous ceramics, only considering the contribution of heat conduction to the effective thermal conductivity, and the closed hole is adopted. The cube model derives the effective thermal conductivity formula, uses the spherical model and analyzes the thermal conductivity by the finite element software. The results show that the nonlinear thermal conductivity is nonlinear. With the increase of the porosity, the thermal conductivity decreases gradually and the change rate is smaller, but it is becoming more and more rapidly decreasing. The simulation results and the theory are preformed. The measurement basically coincides.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ174.1
本文编号：2127511
[Abstract]:As the new porous ceramic materials are widely used in many fields, more and more researchers engaged in material science will turn their attention to this new field. At present, the research on the preparation of porous ceramics has become more and more mature, and the new preparation methods are coming out continuously. The performance of porous ceramics is also widely accepted, and the new research results are constantly appearing. Based on the theoretical research results of porous materials, the effect of porosity on the suppression of porous ceramics and the influence of porosity on the heat transfer performance of porous ceramics is the main line. The theoretical analysis results are predicted as the premise and the ANSYS as the main research tool and the mechanical and heat transfer performance of the porous ceramic material with Al2O3 as the base material is carried out. Through a series of research on the deformation behavior of porous ceramics, we first put forward several hypotheses: the porosity is different, the deformation degree is different; when the porosity reaches a certain degree, the deformation amount is certain value; the geometric model has no obvious influence on the research results of the suppression deformation law. The closed hole spherical surface model and the open hole cube model are used to simulate the pressing process of Al2O3 porous ceramic materials using the finite element software. The compression deformation amount is 30%. results. The porosity and the transverse deformation of the porous ceramics are nonlinear. As the porosity increases, the deformation decreases gradually. When the porosity reaches 6.94% or 53.9%, the porosity is gradually reduced. The variation of the deformation amount is not very obvious. The simulation results are compared with the theoretical predictions. The theoretical prediction and formula deduction are made on the influence of porosity on the heat transfer performance, and the porosity is used to simulate the heat transfer performance of the porous ceramics, only considering the contribution of heat conduction to the effective thermal conductivity, and the closed hole is adopted. The cube model derives the effective thermal conductivity formula, uses the spherical model and analyzes the thermal conductivity by the finite element software. The results show that the nonlinear thermal conductivity is nonlinear. With the increase of the porosity, the thermal conductivity decreases gradually and the change rate is smaller, but it is becoming more and more rapidly decreasing. The simulation results and the theory are preformed. The measurement basically coincides.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ174.1
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2 邵庄;余柄峰;;凝胶注模法制备多孔氧化铝陶瓷的研究[J];中国陶瓷;2007年10期
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