本文選題：多孔氧化鋁 + 蛋白質(zhì)　； 參考：《鄭州大學》2011年碩士論文

【摘要】：多孔氧化鋁陶瓷可以作為催化劑載體,過濾材料,高溫耐火材料等用途,而制造氧化鋁多孔陶瓷的方法有很多,本文采用蛋白質(zhì)發(fā)泡法,蛋白質(zhì)一種很好的發(fā)泡劑和凝結劑,也是一種很好的綠色環(huán)保發(fā)泡劑。 本實驗用氧化鋁為骨料,加入發(fā)泡劑和水進行球磨成所需料漿。用正交分析研究發(fā)泡劑含量、球磨速度和球磨時間這三個參數(shù)對制備材料性能影響,尋找最佳工藝參數(shù)。通過改變料漿中氧化鋁的固含量,制備出不同密度的氧化鋁多孔陶瓷,并觀察固含量對微觀結構和性能的影響。同時還研究用氫氧化鋁代替部分氧化鋁對材料性能影響。 通過TG—DSC分析蛋白質(zhì)和氫氧化鋁的分解行為,確定最佳燒成制度；通過場發(fā)射掃描電子顯微鏡對燒結樣品顯微結構進行分析；通過高溫試驗機測定材料的抗壓強度。 通過正交實驗研究發(fā)泡劑含量、攪拌時間、攪拌速率對材料氣孔率的影響,最終確定發(fā)泡劑含量為25%(以料漿中液體重量為基準),攪拌時間為3h,攪拌速率為160轉／分鐘時制備出的多孔氧化鋁氣孔率最好。通過改變料漿中氧化鋁的固含量可以制備出氣孔率由20%-65%的多孔氧化鋁陶瓷,這些不同氣孔率的多孔氧化鋁陶瓷可以用于不用領域。通過對固含量為40%的料漿中用氫氧化鋁代替部分氧化鋁(以體積比為準)研究制備多孔氧化鋁的性能,最終用20%的氫氧化鋁代替氧化鋁不但可以提高材料的氣孔率還可以有效提高材料的抗壓強度。通過研究納米粉體制備出的多孔氧化鋁材料的性能,得到用固含量為10%的納米氧化鋁可以制備出氣孔分布均勻且具有大量閉氣孔的多孔氧化鋁材料,但是其強度只有1MPa左右,這種材料可以用作高溫隔熱耐火材料。
[Abstract]:Porous alumina ceramics can be used as catalyst carrier, filter material, high temperature refractory and so on, but there are many methods to make alumina porous ceramics. In this paper, protein foaming method is used, protein is a good foaming agent and coagulant. It is also a good green foaming agent. In this experiment, alumina was used as aggregate, foaming agent and water were added into slurry. The effects of foaming agent content, milling speed and milling time on the properties of the prepared materials were studied by orthogonal analysis. Alumina porous ceramics with different densities were prepared by changing the solid content of alumina in slurry, and the effect of solid content on microstructure and properties was observed. At the same time, the effect of aluminum hydroxide replacing part of alumina on the properties of the material is also studied. The decomposition behavior of protein and aluminum hydroxide was analyzed by TG-DSC to determine the best sintering system. The microstructure of sintered samples was analyzed by field emission scanning electron microscope (SEM). The compressive strength of the sintered samples was measured by high temperature testing machine. The effects of foaming agent content, stirring time and stirring rate on the porosity of the materials were studied by orthogonal experiment. Finally, it was determined that the porosity of porous alumina was the best when the content of foaming agent was 25 and the mass of liquid in the slurry was taken as the benchmark, the stirring time was 3 h and the stirring rate was 160 r / min. The porous alumina ceramics with porosity ranging from 20% to 65% can be prepared by changing the solid content of alumina in the slurry. These porous alumina ceramics with different porosity can be used in the field of non-use. The properties of porous alumina were studied by replacing part of alumina with aluminum hydroxide in the slurry with 40% solid content (whichever is the volume ratio). Finally, using 20% aluminum hydroxide instead of alumina can not only improve the porosity of the material, but also improve the compressive strength of the material. By studying the properties of porous alumina prepared by nano-powder, the porous alumina material with 10% solid content can be prepared with uniform pore distribution and a large number of closed pores, but its strength is only about 1MPa. This material can be used as a high-temperature insulating refractory.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TQ174.1

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