【正文】 第 1 頁 利用高鋁粉煤灰合成堇青石陶瓷材料的制備研究 專業(yè)：材料科學(xué)與工程 學(xué)生：張政 指導(dǎo)老師 ：馬立建 摘要 利用高鋁粉煤灰（ %、 SiO246%）為主要原料制備堇青石，添加適量的 鎂砂 （ %），以及少量的硅微粉（ SiO2 96%），按照堇青石的理論配方（ MgO %,Al2O3 % ,SiO2 %）進(jìn)行配比。試樣通過壓力成型機進(jìn)行壓制成型，成型壓力為 120MPa 。 燒 結(jié) 試 樣 分 別 在1150℃ ,1200℃ ,1250℃ ,1270℃ ,1290℃ ,1310℃六個溫度下 進(jìn)行。 燒結(jié)試樣 通過對燒結(jié)試樣的力學(xué)性能、熱學(xué)性能和微觀結(jié)構(gòu)的分析，確定制備堇青石的最佳燒結(jié)工藝 。 實驗結(jié)果表明： 以粉煤灰、 硅微粉 和 工業(yè)燒結(jié) 鎂砂為原材料， 通過對燒結(jié)體進(jìn)行 X射線衍射（ XRD）和掃描電子顯微鏡（ SEM）分析，發(fā)現(xiàn) 成功合成了堇青石陶瓷材料 。 燒結(jié)體中主要以β 堇青石和α 堇青石相存在，還有少量的鎂鋁尖晶石，藍(lán)晶石，鐵堇青石，印度石等礦物相生成。 .抗壓強度，體積收縮率，體積密度，隨溫度的 升高 而增大；氣孔率，吸水率則隨溫度的升高而降低；線膨脹系數(shù)先隨溫度升高 而 降低，當(dāng)燒結(jié)溫度達(dá)到 1200℃ 時，線膨 脹系數(shù)略有提升 。 關(guān)鍵詞： 堇青石，微觀結(jié)構(gòu)，陶瓷材料，熱膨脹系數(shù) 第 2 頁 Abstract Use highalumina fly ash（ Al2O3 %、 SiO2 46%） as the main raw material preparation of cordierite, add appropriate amount of magnesite (MgO %), as well as a small amount of Silicon Powder (SiO2 96%) In accordance with the theoretical formulation of cordierite (MgO %, Al 2O3 %, SiO2 %) to the ratio,.Sample through pressure molding machine pressing, molding pressure 120MPa. And were sintered at 1150℃ ,1200℃ ,1250℃ ,1270℃ ,1290℃ ,1310℃ six temperature. Sintered samples sintered samples through mechanical properties, thermal properties and microstructure analysis to determine the optimum sintering process cordierite Experimental results show that: Fly ash, silica fume and industrial sintered magnesia as raw material, through the sintered body Xray diffraction (XRD) and scanning electron microscopy (SEM) analysis, we found successfully synthesized cordierite ceramic material. Sintered body mainly in the βαcordierite and cordierite phase exists, there is a small amount of magnesium aluminate spinel, kyanite, iron cordierite, India stone and other mineral phase formation. strength, the volume shrinkage ratio, bulk density, with the increase of the sintering temperature。 porosity, water absorption with the sintering temperature is decreased。 linear expansion coefficient of the first with temperature decreases when the sintering temperature reaches 1200 ℃ , the linear expansion coefficient of a slight increase. Key Words:cordierite, microstructure, ceramic materials, the thermal expansion coefficient 第 3 頁 目錄 Abstract ...........................................................................................................................2 1緒 論 ...........................................................................................................................4 研究目的及意義 [3]..............................................................................................5 ............................................................................7 堇青石材料的制備 ..............................................................................................9 天然礦物高溫固相反應(yīng)合成堇青石 .......................................................... 11 氧化物高溫固相反應(yīng)法合成高純堇青石 ................................................... 15 濕化學(xué)法合成高純堇青石粉體 ................................................................. 15 堇青石陶瓷材料的應(yīng)用 ..................................................................................... 17 堇青石陶瓷制備中存在的問題 .......................................................................... 17 2 實驗方案及內(nèi)容 ......................................................................................................... 19 實驗原料的選擇 ............................................................................................... 19 合成堇青石原料配方設(shè)計及計算 ....................................................................... 20 原料的粉磨 ...................................................................................................... 21 坯料的制備與成型 ............................................................................................ 21 燒成 ................................................................................................................. 21 性能測試與分析 ............................................................................................... 21 燒成收縮率的測試 .................................................................................. 22 體積密度、顯氣孔率和吸水率的測試 ....................................................... 22 抗壓強度測試 ......................................................................................... 23 XRD分析 ................................................................................................ 23 掃描電鏡觀察 ......................................................................................... 24 實驗設(shè)備 .......................................................................................................... 24 工藝流程 .......................................................................................................... 25 3 實驗結(jié)果分析與討論 .................................................................................................. 27 體積收縮率 ...................................................................................................... 27 體積密度、顯氣孔率和吸水率的測試 ................................................................. 28 抗壓強度 .......................................................................................................... 29 XRD分析 ......................................................................................................... 30 試樣 SEM 分析 ................................................................................................. 32 結(jié)論 ................................................................................................................. 33 參考文獻(xiàn) ....................................................................................................................... 35 致謝 ................................