發(fā)布時(shí)間：2018-06-05 22:28

  本文選題：氧化鋁泡沫陶瓷 + 凝膠注模�。� 參考：《山東理工大學(xué)》2015年碩士論文

【摘要】：氧化鋁泡沫陶瓷具有耐高溫、耐腐蝕等優(yōu)異性能,有希望作為較理想的耐高溫隔熱材料,用于冶金、化工及航空航天工程中一些易被高溫氣流燒蝕的關(guān)鍵部位。本文分別研究了有機(jī)單體凝膠-發(fā)泡以及無(wú)機(jī)膠粘劑(磷酸二氫鋁)發(fā)泡注凝工藝制備氧化鋁泡沫陶瓷。主要實(shí)驗(yàn)工作和結(jié)論如下：有機(jī)單體凝膠-發(fā)泡工藝制備氧化鋁泡沫陶瓷(1)在pH=9附近時(shí),當(dāng)分散劑外加量小于0.4 wt%時(shí),陶瓷漿料的粘度減小,大于0.4 wt%時(shí),粘度變大,流動(dòng)性變差；當(dāng)固含量小于68 wt%時(shí),陶瓷漿料的粘度變化較小,流動(dòng)性好,大于68 wt%時(shí),漿料粘度急劇升高,流動(dòng)性變差。因此,分散劑外加量為0.4 wt%,固含量為68 wt%時(shí)漿料的流動(dòng)性能滿足凝膠注模的要求。(2)坯體強(qiáng)度隨著單體／交聯(lián)劑比例的增大而不斷增大。燒結(jié)后泡沫陶瓷的氣孔率先減小后增大,抗壓強(qiáng)度和體積密度(Db)先增大后減小。(3)隨著固含量的增加,氧化鋁泡沫陶瓷的氣孔率不斷減小,抗壓強(qiáng)度以及體積密度(Db)不斷增大。無(wú)機(jī)膠粘劑(磷酸二氫鋁)發(fā)泡凝膠工藝制備氧化鋁泡沫陶瓷(1)由XRD譜圖分析可知,燒結(jié)后試樣是由α-Al2O3、C-AlPO4以及T-AlPO4三種物相組成。(2)纖維外加量的增加,漿料的粘度不斷增大,抗壓強(qiáng)度和體積密度(Db)減小,氣孔率增大。當(dāng)氧化鋁纖維外加量超過(guò)20 wt%時(shí),抗壓強(qiáng)度和體積密度(Db)增大,氣孔率減小。隨著燒結(jié)溫度和保溫時(shí)間的增加,纖維斷面凹凸不平,表面粗糙程度增大(3)隨著Al(OH)3外加量的不斷增加,坯體的抗壓強(qiáng)度不斷增大；試樣的氣孔率不斷減小,體積密度(Db)不斷增大,導(dǎo)熱系數(shù)、抗壓強(qiáng)度不斷曾大,超過(guò)15 wt%后導(dǎo)熱系數(shù)、抗壓強(qiáng)度減小。(4)抗壓強(qiáng)度和體積密度(Db)隨著燒結(jié)溫度的升高而增大,氣孔率不斷降低。(5)當(dāng)保溫時(shí)間為4h時(shí),體積密度(Db)、抗壓強(qiáng)度最大,氣孔率最小。隨著保溫時(shí)間的延長(zhǎng),材料的抗壓強(qiáng)度不斷降低,體積密度(Db)也隨之降低,氣孔率升高。
[Abstract]:Alumina foam ceramics have excellent properties such as high temperature resistance, corrosion resistance and so on. It is expected to be used as an ideal high temperature insulation material for metallurgical, chemical and aerospace engineering, which can easily be ablated by high temperature airflow. The preparation of alumina foam ceramics by organic monomer gel-foaming and inorganic adhesive (aluminum dihydrogen phosphate) foaming was studied in this paper. The main experimental work and conclusions are as follows: when the organic monomer gel-foaming process is used to prepare alumina foam ceramics, when the amount of dispersant is less than 0.4 wt%, the viscosity of ceramic paste decreases when the amount of dispersant is less than 0.4 wt%, and the viscosity becomes larger when the amount of dispersant is less than 0.4 wt%. When the solid content is less than 68 wt%, the viscosity of ceramic paste is small, and the fluidity is good. When the content of solid is less than 68 wt%, the viscosity of the slurry increases sharply and the fluidity becomes worse. Therefore, when the amount of dispersant is 0.4 wtlong and the solid content is 68 wt%, the fluidity of the slurry can meet the requirement of gel-casting.) the strength of the billet increases with the increase of monomer / crosslinking agent ratio. After sintering, the porosity of alumina foam ceramics first decreases and then increases, and the compressive strength and bulk density increase first and then decrease. 3) with the increase of solid content, the porosity of alumina foam ceramics decreases, and the compressive strength and bulk density of alumina foam ceramics increase. Inorganic adhesive (aluminum dihydrogen phosphate) foaming gel process to prepare alumina foam ceramic (1) from the XRD spectrum analysis, the sintered sample is composed of 偽 -Al _ 2O _ 3, C-AlPO _ 4 and T-AlPO4, the added amount of fiber is increased, and the viscosity of the paste is increasing. The compressive strength and bulk density decreased and the porosity increased. The compressive strength and bulk density of alumina fiber increase and the porosity decreases when the added amount of alumina fiber exceeds 20 wt%. With the increase of sintering temperature and holding time, the fiber section is uneven and the surface roughness increases. With the increase of Al(OH)3 addition, the compressive strength of the billet increases, and the porosity of the sample decreases. The volume density (Db) is increasing, and the thermal conductivity and compressive strength are increasing. After 15 wt%, the thermal conductivity and compressive strength decrease. 4) the compressive strength and bulk density increase with the increase of sintering temperature. When the holding time is 4 h, the volume density and the porosity are the largest and the lowest. With the prolongation of the holding time, the compressive strength of the material decreases, the bulk density decreases, and the porosity increases.
【學(xué)位授予單位】：山東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TQ174.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 楊秋婷;史陽(yáng);;泡沫陶瓷的研究現(xiàn)狀和發(fā)展前景[J];佛山陶瓷;2009年04期

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本文編號(hào)：1983649