【摘要】：新型多孔陶瓷材料在諸多領(lǐng)域的廣泛應(yīng)用,讓越來越多的從事材料科學(xué)的研究者將目光轉(zhuǎn)向這個新領(lǐng)域。目前多孔陶瓷的制備技術(shù)研究已日臻成熟,新的制備方法不斷問世。多孔陶瓷的性能研究也廣受青睞,新的研究成果不斷出現(xiàn)。本文以多孔材料理論研究成果為基礎(chǔ),以孔隙率對多孔陶瓷壓制變形影響規(guī)律、孔隙率對多孔陶瓷傳熱性能影響規(guī)律為主線,以理論分析結(jié)果預(yù)測為前提,以ANSYS為主要研究工具,對Al2O3為基礎(chǔ)材料的多孔陶瓷材料力學(xué)及傳熱性能進行了仿真實驗分析。通過對多孔陶瓷的壓制變形行為的系列研究,首先提出了幾點假設(shè):孔隙率不同則壓制變形程度不同;孔隙率達到一定程度時,壓制變形量為一定值;幾何模型對壓制變形規(guī)律研究結(jié)果影響不明顯。構(gòu)建了表述多孔材料的閉孔球面模型和開孔立方體模型,利用有限元軟件對Al2O3多孔陶瓷材料進行壓制過程仿真分析,壓制變形量為30%。結(jié)果顯示,孔隙率和多孔陶瓷的橫向變形量成非線性關(guān)系,隨著孔隙率上升,變形逐漸減小。當(dāng)孔隙率分別達到6.94%或53.9%時,其變形量變化已經(jīng)不很明顯。仿真結(jié)果與理論預(yù)測結(jié)果比較,得到了基本一致的結(jié)論。對孔隙率對傳熱性能影響規(guī)律進行理論預(yù)測和公式推導(dǎo),并對孔隙率對多孔陶瓷傳熱性能進行了仿真,僅考慮熱傳導(dǎo)對有效熱導(dǎo)率的貢獻,采用閉孔立方體模型對有效導(dǎo)熱系數(shù)進行了公式推導(dǎo),采用球面模型,利用有限元軟件對導(dǎo)熱性能進行分析。結(jié)果顯示,有效熱導(dǎo)率的非線性,隨著孔隙率的增加,導(dǎo)熱系數(shù)逐漸減小,變化速率較小,但呈現(xiàn)越來越快的下降趨勢。仿真結(jié)果與理論預(yù)測基本吻合。
[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.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ174.1

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本文編號：2127511